Công bố quốc tế lĩnh vực môi trường số 09-2024

Về quản lý môi trường

– Hiệu quả hoạt động môi trường, xã hội và quản trị (ESG) của doanh nghiệp trong thời kỳ xung đột địa chính trị.

– Các chất Per- và polyfluoroalkyl (PFAS) trong nước thải đô thị và chất rắn sinh học của Canada: Các mô hình và xu hướng thời gian gần đây từ 2009 đến 2021.

– Phân tích thực nghiệm không gian theo thời gian về xu hướng ô nhiễm hạt PM2.5 và chỉ số chất lượng không khí (AQI) ở Châu Phi bằng cách sử dụng bộ dữ liệu phân tích lại MERRA-2 (1980–2021).

– Đánh giá tác động của việc trình diễn chuỗi cung ứng xanh do chính phủ chỉ đạo đối với khó khăn tài chính của doanh nghiệp: Vai trò của chất lượng công bố thông tin môi trường và sự tập trung của chuỗi cung ứng.

– Điều tra các tác động không gian của PM2.5 liên quan đến việc sử dụng đất và phục hồi sinh thái trong các khu đô thị.

– Cơ hội chuyển đổi nhựa phế thải thành hóa dầu: Thiết kế quy trình, tối ưu hóa đa mục tiêu và đánh giá đa hướng về công nghệ-kinh tế-xã hội-môi trường.

– Tác động của khí hậu và lợi ích tiềm năng của tăng trưởng xuất khẩu dịch vụ ở các nước đang phát triển.

– Tác động của con người đến không gian xanh đô thị và tác động qua lại của nó đối với sức khỏe con người và sinh thái xã hội.

– Sự phát triển của dấu vân tay parafin và olefin clo hóa trong bùn thải từ năm 1993 đến năm 2020 tại một nhà máy xử lý nước thải đô thị ở Thụy Sĩ.

– Lập kế hoạch môi trường sinh thái của các cộng đồng đa năng lượng trong thị trường điện và khí đốt tự nhiên địa phương có tính đến thuế carbon: Chiến lược hai cấp phi tập trung.

Về môi trường đô thị

– Các sáng kiến cấp cơ sở giúp chuyển đổi các thành phố hướng tới tương lai sau tăng trưởng: Những hiểu biết sâu sắc từ phong trào kinh tế hợp tác ở Gothenburg, Thụy Điển.

– Xác định mối liên hệ giữa các rủi ro đa hiểm họa và rủi ro sinh thái xã hội để tăng cường khả năng thích ứng của địa phương.

– Tác động phi tuyến tính của việc giảm nồng độ NOx đối với sự hình thành khí dung thứ cấp ở khu vực Bắc Kinh-Thiên Tân-Hà Bắc: Bằng chứng từ các thí nghiệm trong buồng sương mù và quan sát thực địa.

– Tác động của sự phát triển công nghệ trong phương tiện vận tải đối với việc giảm thiểu ô nhiễm không khí ở các thành phố đô thị: Một nghiên cứu điển hình về Istanbul.

– Rào chắn tường chắn sóng dài hạn dẫn đến hình thành đầm phá ven biển đô thị với khả năng kháng kháng sinh tăng.

– Sacarit trung tính và hemiaellulose trên hai khu đô thị ở Đồng bằng Ấn Độ và Trung Âu trong mùa đông.

– Giám sát dựa trên hiệu quả của hai con sông chịu ảnh hưởng của đô thị và nông nghiệp cho thấy một loạt các hoạt động sinh học trong trầm tích và chiết xuất nước.

– Phân loại sol khí sử dụng tỷ lệ khử cực tuyến tính hạt (PLDR) trên bảy địa điểm đô thị của Châu Á.

– Chất lượng không khí và đặc điểm của các kiểu thời tiết hoàn lưu synop tại một thành phố Nam Mỹ từ Argentina.

– Các sản phẩm biến đổi hydroxyl hóa của các hoạt chất dược phẩm: Tạo ra từ các quá trình được sử dụng trong các nhà máy xử lý nước thải và giám sát môi trường của nó.

Về môi trường khu công nghiệp

– Chlorella pyrenoidosa như một chất xử lý sinh học tiềm năng: Khả năng chịu đựng và phản ứng phân tử của nó đối với cadmium và chì.

– Liệu sự tích tụ tài chính có thể hạn chế việc giảm lượng khí thải carbon từ ngành nông nghiệp ở Trung Quốc? Phân tích vai trò của cơ cấu công nghiệp và tài chính kỹ thuật số.

– Cải thiện ước tính lượng khí thải CO2 từ các nhà máy nhiệt điện dựa trên việc thu hồi OCO-2 XCO2 bằng cách sử dụng mô phỏng luồng nội tuyến.

– Mức độ trung hòa carbon của Hoa Kỳ năm 2050: Huyền thoại hay thực tế? Đánh giá tác động của công nghiệp công nghệ cao và điện xanh.

– Tác động của con người đến không gian xanh đô thị và tác động qua lại của nó đối với sức khỏe con người và sinh thái xã hội.

– Đánh giá khả năng tương thích của việc tích hợp lưu trữ năng lượng nhiệt vào hệ thống cung cấp và thu hồi nhiệt công nghiệp.

– Ảnh hưởng của tính không đồng nhất đến hiệu quả môi trường: Bằng chứng từ các ngành công nghiệp châu Âu trong các lĩnh vực.

– Mô hình QSPR dựa trên máy biến áp đa bộ mã hóa dựa trên sự chú ý có thể giải thích được để đánh giá độc tính và tác động môi trường của hóa chất.

– Đánh giá vai trò của đổi mới năng lượng, chi phí nhiên liệu hóa thạch và tuân thủ môi trường đối với quá trình chuyển đổi năng lượng ở các nền kinh tế công nghiệp tiên tiến.

– Những thay đổi về ô nhiễm không khí công nghiệp và sự khởi phát của bệnh hen suyễn ở trẻ em ở Quebec, Canada.

Xin trân trọng giới thiệu!

The Environmental Management Special Section is pleased to present to our valued readers the International Environmental Bulletin No. 09-2023, featuring the following key topics:

ENVIRONMENTAL MANAGEMENT / QUẢN LÝ MÔI TRƯỜNG

1. Microplastics in the sediments along the eastern Arabian Sea shelf: Distribution, governing factors and risk assessment

Science of The Total Environment, Volume 910, 1 February 2024, 168629

Abstract

Despite the omnipresence of microplastics (MPs), the studies around the western continental shelf of Indian Ocean (Eastern Arabian Sea-EAS) are uncovered and understudied. Thus, the present study was focused to understand the spatial distribution, characterization and risk assessment of MPs in sediment across seven coastal transects (10 to 50 m) all along the EAS shelf.

The highest MPs concentration (MPs/kg d.w.) was detected in the northern EAS (NEAS; 2260 ± 1050) followed by central (CEAS; 1550 ± 1012) and southern (SEAS; 1300 ± 513) shelves. Among all distinct locations, the highest concentration of MPs (2500 ± 1042) was detected in the north coastal sediments off Mumbai, followed by off Mangalore (1480 ± 1169) in the center and off Kochi (1350 ± 212) in the south.

MPs were found in the form of fibres, fragments and films with a predominance of fibres (~70–80 %). Approximately 74.6 % of the total MPs were in the size range of 300 μm to 5 mm. The surface of detected MPs was rough, irregular, and mechanical weathering features such as pits, grooves also observed and spotted with bacterial community structures. Polypropylene (PP; 34 %), polyisoprene (PIP; 19 %), butyl rubber (18 %), and low-density polyethylene (LDPE; 13 %) were dominant polymers. The pollution load index highlighted minor risk while the polymer hazard index exhibited a hazard level of V.

Litter discharge, fishing activities, and active marine navigation are among the many high-risk sources of plastic contamination in this region. Due to the prevailing winds, currents, low sea surface height, and high precipitation, the conditions in the EAS are favorable for the accumulation of both sea-based and land-based particles. Hence, this study provides novel insights into the potential risks posed by MP to the IO rim and associated marine ecosystem which will enhance our knowledge of the ecological implications and consequences of MP pollution, ultimately aiding in developing effective management and mitigation strategies.

2. Environmental, social and governance (ESG) performance of firms in the era of geopolitical conflicts

Journal of Environmental Management, Volume 351, February 2024, 119744

Abstract

Do geopolitical conflicts matter for the environmental, social, governance (ESG) and overall ESG performance of firms? We answer this question by studying the impact of geopolitical conflict of a country on the ESG performance, separately and collectively, of firms of that country. We use data from Refinitiv and UCDP/PRIO (Uppsala Conflict Data Program/International Peace Research Institute, Oslo) databases for the period from 2002 to 2021 for 79 countries and we use fixed effects regression as our main methodology. We find that if a country is in a geopolitical conflict, their firms are impacted in the form of lower E, S and G performance and overall ESG performance, with stronger effects for developed countries. This comes on top of the direct costs of geopolitical conflicts. Our results are robust to country, year and firm fixed effects as well as robust to endogeneity as we use Lewbel (2012) estimator to eliminate any chances of endogeneity. We provide first evidence on this topic and it has geopolitical and socioeconomical implications.

3. Per- and polyfluoroalkyl substances (PFAS) in Canadian municipal wastewater and biosolids: Recent patterns and time trends 2009 to 2021

Science of The Total Environment, Volume 912, 20 February 2024, 168638

Abstract

The concentrations of per- and polyfluoroalkyl substances (PFAS) were determined in raw influent, final effluent, and treated biosolids at Canadian wastewater treatment plants (WWTPs) to evaluate the fate of PFAS through liquid and solids trains of typical treatment process types used in Canada and to assess time trends of PFAS in wastewater between 2009 and 2021. Data for 42 PFAS in samples collected from 27 WWTP across Canada were used to assess current concentrations and 48 WWTPs were included in the time trends analysis. Although regulated and phased-out of production by industry since the early 2000s and late 2000s/early2010s, respectively, perfluorooctanesulfonate (PFOS), perfluorooctanoate (PFOA), and other long-chain PFAS continue to be widely detected in Canadian wastewater and biosolids. Short-chain PFAS that are not currently regulated in Canada were also widely detected. In general, elevated concentrations of several PFAS were observed at WWTPs that receive landfill leachate. Except for PFOS, concentrations of long-chain perfluoroalkyl carboxylates (PFCAs) and perfluoroalkane sulfonates (PFSAs) generally decreased over time in influent, effluent, and biosolids, which is attributable to industrial production phase-outs and regulations.

Concentrations of PFOS did not decrease over time in wastewater media. This indicates that regulatory action and industrial phase-outs of PFOS are slow to be reflected in wastewater. Concentrations of short-chain PFCAs in wastewater influent and effluent consistently increased between 2009 and 2021, which reflect the use of short-chain PFAS as replacements for phased-out and regulated longer-chained PFAS. Short-chain PFAS were infrequently detected in biosolids. Continued periodic monitoring of PFAS in wastewater matrices in Canada and throughout the world is recommended to track the effectiveness of regulatory actions, particularly activities to address the broad class of PFAS.

4. Design of aluminum eco-composite for sustainable engineering application by the valorization of municipal wastes: Experimental and response surface analysis

Journal of Cleaner Production, Volume 440, 10 February 2024, 140793

Abstract

Reprocessing municipal wastes into useful engineering components is one way to reduce their environmental impact. This paper presents a report on an alternative experimental approach to reprocessing common environmental wastes like aluminum scraps, steel shavings, and coconut shells into eco-friendly engineering composite. Equally, response surface analysis was incorporated in the development and validation of predictive models fit for future prediction of response properties. Aluminum scrap was heated into a liquid state and reinforced with recycled steel particles (RSP) and coconut shell ash particles (CSP) at varying proportions. Specimen design involves three group mixes: A, B, and C. Each of the three groups mixes comprised 0, 1, and 2 % RSP at constant dosage, respectively. Meanwhile, each mix was incorporated with 4, 8, and 12 wt % CSP.

The microstructural features, physical (porosity, density, and relative density), and mechanical (tensile strength, hardness, elastic modulus, fracture toughness, impact strength, and percentage ductility) properties were appraised. The outcome revealed that the combination of the two reinforcements (RSP and CSP) contributed to microstructural evolution within the specimens.

The porosities of the composite specimens were reported to marginally increase with the reinforcement combination. Interestingly, the composite exhibited lighter weight with improved mechanical performance. Mathematical models derived for the response properties were certified fit for future analysis and predictions. Meanwhile, the optimization procedure revealed that the combination of 1.3 % RSP and 6.7 % CSP was suitable for the design of optimal recycled aluminum composites for sustainable engineering designs. The results clarified that the reinforcement particles (RSP and CSP) are low-cost alternatives to synthetic ceramic reinforcements in the aluminum composite.”

5. Spatiotemporal empirical analysis of particulate matter PM2.5 pollution and air quality index (AQI) trends in Africa using MERRA-2 reanalysis datasets (1980–2021)

Science of The Total Environment, Volume 912, 20 February 2024, 169027

Abstract

In this study, the spatial-temporal trends of PM2.5 pollution were analyzed for subregions in Africa and the entire continent from 1980 to 2021. The distributions and trends of PM2.5 were derived from the monthly concentrations of the aerosol species from MERRA-2 reanalysis datasets comprising of sulphates (SO4), organic carbon (OC), black carbon (BC), Dust2.5 and Sea Salt (SS2.5). The resulting PM2.5 trends were compared with the climate factors, socio-economic indicators, and terrain characteristics. Using the Mann-Kendall (M-K) test, the continent and its subregions showed positive trends in PM2.5 concentrations, except for western and central Africa which exhibited marginal negative trends.

The M-K trends also determined Dust2.5 as the dominant contributing aerosol factor responsible for the high PM2.5 concentrations in the northern, western and central regions of Africa, while SO4 and OC were respectively the most significant contributors to PM2.5 in the eastern and southern Africa regions. For the climate factors, the PM2.5 trends were determined to be positively correlated with the wind speed trends, while precipitation and temperature trends exhibited low and sometimes negative correlations with PM2.5. Socio-economically, highly populated, and bare/sparse vegetated areas showed higher PM2.5 concentrations, while vegetated areas tended to have lower PM2.5 concentrations.

Topographically, low laying regions were observed to retain the deposited PM2.5 especially in the northern and western regions of Africa. The Air Quality Index (AQI) results showed that 94 % of the continent had an average PM2.5 of 12–35 μg/m3 hence classified as “Moderate” AQI, and the rest of the continent’s PM2.5 levels was between 35 and 55 μg/m3 implying AQI classification of “Unhealthy for Sensitive People”. Northern and western Africa regions had the highest AQI, while southern Africa had the lowest AQI. The approach and findings in this study can be used to complement the evaluation and management of air quality in Africa.

6. Assessing the impact of government-led green supply chain demonstration on firms’ financial distress: The role of environmental information disclosure quality and supply chain concentration

Journal of Cleaner Production, Volume 440, 10 February 2024, 140786

Abstract

Amidst the global advancement of sustainable production, the green supply chain initiative is becoming increasingly significant in harmonizing environmental and economic interests. This study delves into the financial implications of such initiatives, focusing on a particular government-led green supply chain demonstration project. Utilizing a difference-in-differences model and data from firms involved in the project between 2010 and 2021, findings indicate a notable reduction in firms’ financial distress.

This result, framed within the resource-based view perspective, shed lights on how green policy value permeates a company’s internal capabilities, aligning environmental goals with financial performance. Additionally, we found that when companies enhance the quality of their environmental information disclosure and decrease the concentration of their supply chain, the inhibitory effect of this demonstration policy on financial distress is amplified. This underscores the pivotal value of enhancing information transparency and maintaining a flexible supply chain structure in green supply chain practices. In conclusion, this study emphasizes the empirical link between sustainable operations and financial resilience, laying a strong theoretical groundwork for businesses to proactively adopt green practices and aiding in the government’s crafting of environmental policies.

7. Investigation of the spatial effects on PM2.5 in relation to land use and ecological restoration in urban agglomerations

Science of The Total Environment, Volume 913, 25 February 2024, 169665

Abstract

Heavy pollution of particulate matter with an aerodynamic diameter of <2.5 μm (PM2.5) poses increasing threats to the living environment worldwide. Urban agglomerations often lead to regional rather than local air pollution problems. This study explored the underlying global and local spatial driving mechanisms of PM2.5 variations of the 195 county-level administrative units in the urban agglomeration in the middle reaches of the Yangtze River, China, in 2020, using the global spatial regression and geographically weighted regression methods. Results showed that (1) at the county level, there were spatial variations of PM2.5, fluctuating from 20.1263 μg/m3 to 44.8416 μg/m3. (2) The concentrations of PM2.5 presented a positive spatial autocorrelation with a remarkable direct spatial spillover effect. (3) Forestland, grassland, elevation and ecological restoration were negatively correlated with PM2.5 concentrations, the indirect spatial spillover effect of elevation was noticeable. (4) The indirect reduction effects of ecological restoration on PM2.5 concentrations were substantial in the Wuhan urban agglomeration. (5) The reduction effect of forestland, grassland, ecological restoration and elevation on PM2.5 showed a noticeable spatial heterogeneity. In the future, it is suggested regional variability and the spatial spillover effect of air pollution be taken into account in environmental governance. Simultaneously, utilization of the mitigation effect of ecological restoration on PM2.5 is anticipated for the concerted effort in air pollution governance.

8. Opportunities for converting waste plastics into petrochemicals: Process design, multi-objective optimization, and omnidirectional techno-economic-society-environment assessment

Journal of Cleaner Production, Volume 440, 10 February 2024, 140821

Abstract

Waste plastics catalytic cracking, a carbon-negative process from the life cycle perspective, is a forceful executable configuration for cyclic utilization in the ecology. However, industrializing this emerging process requires to prevail a series of challenges, including time-consuming and massive pilot tests, process strengthening, and parameter optimization. To accelerate industrialization, we developed a fraction-structure lumps reaction model that significantly improves efficiency and accuracy. Moreover, multi-objective optimization and multi-dimensional evaluation were further done by implementing this process model.

Together, a subsequent assessment of society and the environment was carried out. Compared with the non-optimized process, the optimized waste plastic catalytic cracking process exhibits superior economic, social, and environmental performance. The final optimization results of the reaction temperature and catalyst/oil ratio are 564.27 and 25.95, respectively. Quantitative results of this study indicate that catalytic cracking of waste plastics can effectively reduce the emissions of 1.86 t CO2 eq/t feedstocks. For the 200,000-ton scale waste plastic catalytic cracking process constructed, it can effectively reduce 372,000 tons of carbon dioxide equivalent emissions annually. From the view of life cycle society-environment behavior, it can be intuitively seen that the primary energy consumption of the WPCC-Pro process optimized based on the same functional units (considering social and environmental factors) is better than that of the WPCC process.

9. The climate impacts and potential benefits of services export growth in developing countries

Science of The Total Environment, Volume 913, 25 February 2024, 169775

Abstract

Promoting the services trade is considered an effective means of revitalizing the economy at a marginal environmental cost in the post-pandemic era. However, the impact of services trade growth and how to promote services development remain to be addressed. This study investigates the performance of the services trade for both developed and developing countries as well as the impact of their services trade growth on the Paris Agreement climate target and the possible synergy for achieving the Sustainable Development Goals (SDGs). Moreover, policy recommendations are provided for developing countries to facilitate services trade growth.

Input–output analysis, comparative advantage theory, and the Model for the Assessment of Greenhouse Gas Induced Climate Change (MAGICC) are used in this study. The results show that services trade accounted for 44.4 % of global trade-induced value added but only 14.7 % of CO2 emissions. Services trade growth would lead to 199.8 Mt and 311.2 Mt CO2 emissions under the ServGrow scenario and DoubDeve scenario, respectively, suggesting that vigorously promoting services exports growth of developing countries has limited carbon implications.

Further simulation indicates that the global atmospheric temperature increase caused by services trade growth in both scenarios is within 0.05 °C. Notably, accelerating services exports growth in developing countries helps to mitigate the inequality between developed and developing countries. The findings of this study can inform policymakers regarding the formulation and implementation of policies for economic recovery, reducing inequality, addressing climate change, and contributing to the achievement of the SDGs.

10. Anthropogenic impacts on urban blue space and its reciprocal effect on human and socio-ecological health

Journal of Environmental Management, Volume 351, February 2024, 119727

Abstract

Quantifying anthropogenic impacts on blue space (BS) and its effect on human and socio-ecological health was least explored. The present study aimed to do this in reference to the urban BS transformation scenario of Eastern India. To measure BS transformation, Landsat image-based water indices were run from 1990 to 2021. Anthropogenic impact score (AIS) and 7 components scores of 78 selected BS on 70 parameters related data driven from the field. Total 345 respondents were taken for human and socio-ecological health assessment. For this, depression (DEP), anxiety (ANX), stress (STR), physical activities (PA), social capital (SC), therapeutic landscape (TL) and environment building (EB) parameters were taken.

The result exhibited that BS was reduced. About 50% of urban core BS was reported highly impacted. Human and socio-ecological health was identified as good in proximity to BS, but it was observed better in the cases of larger peripheral BS. AIS on BS was found to be positively associated with mental health (0.47–0.63) and negatively associated with PA, SC, TL and EB (−0.50 to −0.90). Standard residual in ordinary least square was reported low (−1.5 to 1.5) in 95% BS. Therefore, BS health restoration and management is crucial for sustaining the living environment.

11. Evolution of chlorinated paraffin and olefin fingerprints in sewage sludge from 1993 to 2020 of a Swiss municipal wastewater treatment plant

Chemosphere, Volume 349, February 2024, 140825

Abstract

Exposure of humans to chlorinated paraffins (CPs) and chlorinated olefins (COs) can occur via contact with CP-containing plastic materials. Such plastic materials can contain short-chain CPs (SCCPs), which are regulated as persistent organic pollutants (POPs) under the Stockholm Convention since 2017.

Municipal wastewater treatment plants (WWTP) collect effluents of thousands of households and their sludge is a marker for CP exposure. We investigated digested sewage sludge collected in the years 1993, 2002, 2007, 2012, and 2020 from a Swiss WWTP serving between 20000 and 23000 inhabitants. A liquid chromatography mass spectrometry (R > 100000) method, in combination with an atmospheric pressure chemical ionization source (LC-APCI-MS), was used to detect mass spectra of CPs and olefinic side products. A R-based automated spectra evaluation routine (RASER) was applied to search for ∼23000 ions whereof ∼6000 ions could be assigned to CPs, chlorinated mono- (COs), di- (CdiOs) and tri-olefins (CtriOs). Up to 230 CP-, 120 CO-, 50 CdiO- and 20 CtriO-homologues could be identified in sludge. Characteristic fingerprints were deduced describing C- and Cl-homologue distributions, chlorine- (nCl) and carbon- (nC) numbers of CPs and COs.

In addition, proportions of saturated and unsaturated material were determined together with proportions of different chain length classes including short- (SC), medium- (MC), long- (LC) and very long-chain (vLC) material. A substantial reduction of SCCPs of 84% was observed from 1993 to 2020. Respective levels of MCCPs, LCCPs and vLCCPs decreased by 61, 69 and 58%. These trends confirm that banned SCCPs and non-regulated CPs are present in WWTP sludge and higher-chlorinated SCCPs were replaced by lower chlorinated MCCPs. Combining high-resolution mass spectrometry with a selective and fast data evaluation method can produce characteristic fingerprints of sewage sludge describing the long-term trends in a WWTP catchment area.

12. Eco-environmental scheduling of multi-energy communities in local electricity and natural gas markets considering carbon taxes: A decentralized bi-level strategy

Journal of Cleaner Production, Volume 440, 10 February 2024, 140902

Abstract

Multi-energy communities (MEC) integrated with renewable resources are known as a cost-effective and highly efficient solution to meet the diverse energy needs of subscribers. The increasing integration of MECs with electricity and natural gas networks has made it necessary to design new frameworks to optimize their energy management and then facilitate their participation in competitive energy markets. Hence, this article presents a bi-level optimization strategy for the decentralized coordination of MECs in competitive electricity and gas markets, in which the system operator adopts a robust technique to deal with operational uncertainties.

The daily planning of MECs is performed in the upper level, while in the lower level, the planning of electricity and natural gas networks takes place. An adaptive alternating direction method of multipliers (ADMM) algorithm has also been introduced to settle the electricity and natural gas markets in a decentralized space while considering the CO2 footprint tax. The proposed strategy is implemented on a system containing a modified 69-bus IEEE distribution electricity network (EN) and a 65-node natural gas network (NGN).

The results obtained from the case studies show that the proposed adaptive ADMM algorithm reached the optimal point in 113 iterations less than the original version, reducing the solution time by 48.01 %. The results prove that the proposed strategy has been able to coordinate the decentralized MECs with the least data sharing in the competitive electricity and gas markets. Additionally, it effectively utilizes the capabilities of renewable-based assets, storage systems, and smart EV charging to reduce the CO2 footprint, alleviate congestion, and improve the voltage and gas pressure profiles, while leading to reduced market clearing prices.

13. Review on the escalating imperative of zero liquid discharge (ZLD) technology for sustainable water management and environmental resilience

Journal of Environmental Management, Volume 351, February 2024, 119614

Abstract

This comprehensive review delves into the forefront of wastewater treatment technology, with a specific focus on the revolutionary concept of Zero Liquid Discharge (ZLD). (ZLD), underpinned by a sustainable ethos, aspires to accomplish total water reclamation, constituting a pivotal response to pressing environmental issues. The paper furnishes a historical panorama of (ZLD), elucidating its motivating factors and inherent merits. It navigates a spectrum of (ZLD) technologies encompassing thermal methodologies, (ZLD) synergized with Reverse Osmosis (RO), High-Efficiency Reverse Osmosis (HERO), Membrane Distillation (MD), Forward Osmosis (FO), and Electrodialysis Reversal (EDR).

Moreover, the study casts a global purview over the deployment status of (ZLD) systems in pursuit of resource recovery, accentuating nations such as the United States, China, India, assorted European Union members, Canada, and Egypt. Meticulous case studies take center stage, underscoring intricate scenarios involving heavily contaminated effluents from challenging sectors including tanneries, textile mills, petroleum refineries, and paper mills. The report culminates by distilling sagacious observations and recommendations, emanating from a collaborative brainstorming endeavor. This compendium embarks on an enlightening journey through the evolution of wastewater treatment, (ZLD)’s ascendancy, and its transformative potential in recalibrating water management paradigms while harmonizing industrial progress with environmental stewardship.

14. The influence mechanism of supporting cities’ development on the spatial expansion of economic development zones: Evidence from China’s coast

Journal of Cleaner Production, Volume 440, 10 February 2024, 140844

Abstract

A sustainable economy through the rational spatial expansion of coastal areas is an increasingly essential global topic. This paper aims to explore the mechanism by which supporting cities influence the spatial expansion of economic development zones (EDZs) in 264 coastal EDZs of China during 1995–2020. Meanwhile, the effects of variations in the distance between supporting cities and coastal EDZs and different city scales are considered. The results provide new explanations for realizing the sustainable development of the coastal economy by planning EDZs at a suitable location from the supporting city.

The supporting cities’ economic strength can significantly contribute to the spatial expansion of coastal EDZs. The influence shows a distance decay law when the distance is less than 47.692 km, between 47.692 and 58.039 km, and greater than 58.039 km, with impact coefficients of 0.479, 0.393, and 0.212, respectively. The average spatial scale of coastal EDZs varies in an “inverted U–shape” with increasing distance. The average spatial scale of the urban general radiation type (47.692 km ≤ distance <58.039 km) is the largest. Supporting cities’ scale affects the economic radiation range of supporting cities. The results suggest three implications for the future development of coastal EDZs. 1) Building the EDZ while incorporating practical development needs; 2) Scientifically planning the spatial layout of EDZs; 3) The synergistic development of supporting cities, transportation hubs, and EDZs.

15. Evaluating the roles of energy innovation, fossil fuel costs and environmental compliance towards energy transition in advanced industrial economies

Journal of Environmental Management, Volume 351, February 2024, 119709

Abstract

Given the dire state of climate change, investigating key elements that impact the energy transition process and help monitor progress in greenhouse gas emissions to achieve environmental sustainability is of critical importance. The current study explores the association between energy transition, compliance with environmental agreements, fossil fuels costs, environmental technologies, economic growth, and environmental degradation in G20 economies from 1995 to 2019.

Our findings from extensive econometric analysis reveal that economic growth, environmental innovation, renewable energy, and environmental compliance facilitate while fossil fuels and environmental degradation hinder the energy transition process. Our findings conclude that developed countries must focus on alternate energy resources to overcome environmental challenges and subsidize renewable energy and environmental technologies to replace fossil fuels with green energy resources methodologically. Further, policy measures have been discussed in detail in the study.

16. Urban unemployment, environmental preservation and trade policies in a small open economy with open access renewable resources

Journal of Cleaner Production, Volume 440, 10 February 2024, 140912

Abstract

This study presents a two-sector dynamic analytical model that examines the impact of trade policies on urban poverty reduction and resource conservation, given that institutionally fixed high urban wages are assumed in the context of the Harris-Todaro model. Rural resource-good and urban manufacturing activities generate simultaneous environmental pressures that can detrimentally impact environmental preservation in a small, open economy. Moreover, this study assumes that the polluting manufacturing sector is the primary cause of environmental degradation and represents a relatively more industrialized developing country.

The study finds that raising the import tax on rural resource goods can reduce urban unemployment but worsen environmental quality under dynamic resource conditions. Given institutional distortions, the most efficient policy is to implement a rural income subsidy combined with an urban wage subsidy at a lower rate; alternatively, if the income inequality between regions is sufficiently high, an income tax on urban manufactured goods could be considered. Finally, when considering the endogenous resolution of institutional distortions, an increase in the import tax on rural resource goods can resolve rural institutional distortions, shifting from poorly defined resource management to a perfect private management system. In contrast, implementing an export tariff policy on urban manufactured goods reduces the incentive for rural institutional reform while addressing urban institutional failure.

URBAN ENVIRONMENT/ MÔI TRƯỜNG ĐÔ THỊ

1. Measurement of haloacetic acids in human urine samples from six megacities of China using a refined detection method

Science of The Total Environment, Volume 910, 1 February 2024, 168379

Abstract

Haloacetic acids (HAAs) are common disinfection by-products in chlorine disinfected water. Humans are extensively exposed to them. However, nationwide biomonitoring data were not available for any country. This study developed a labor-efficient and sensitive method for the detection of urinary HAAs, including trichloroacetic acid (TCAA) and dichloroacetic acid (DCAA), and conducted an exposure assessment in a Chinese population. A total of 850 first-morning-void urine samples were collected from adults in six megacities in China: Wuhan (central), Lanzhou (northwest), Chengdu (southwest), Taiyuan (north), Shanghai (east), and Dalian (northeast).

Each participant (n = 425) provided a pair of urine samples during the warm (September to October 2018) and cold (December 2018 to January 2019) seasons. The detection method achieved good retention of the target analytes using a Fluoro-Phenyl column and excellent selectivity using in-source fragmentation ions as precursor ions in multiple reaction monitoring. The detection rate of urinary TCAA in Chinese populations was high (78.5%) but varied among different regions (54.0% to 98.0%). DCAA was rarely detected (<10%).

The overall median value of specific gravity adjusted TCAA concentrations was 5.70 μg/L in the warm season and 3.87 μg/L in the cold season, respectively. Higher urinary TCAA concentrations were more likely to occur in Wuhan (Yangtze River Basin), urban areas, and during the warm season. The upstream region of the Yangtze River Basin (Chengdu) typically has lower TCAA concentrations. TCAA formation in coastal cities such as Shanghai and Dalian may be impacted by seawater intrusion. Estimated daily intakes of TCAA were lower than its chronic reference dose of 20 μg/kg-bw/day. This detection method can be applied to future biomonitoring of urinary HAAs. More attention should be paid to the highly exposed subgroups when exploring the health effects of long-term TCAA exposure.

2. Grassroots initiatives transforming cities toward post-growth futures: Insights from the collaborative economy movement in Gothenburg, Sweden

Journal of Cleaner Production, Volume 441, 15 February 2024, 140824

Abstract

Grassroots initiatives (GIs) are local, yet globally connected networks of activists that generate novel solutions for sustainability. While GIs are often claimed to play an important role for urban sustainability transitions, little research has examined how such innovations consolidate beyond isolated local initiatives. This article summarizes findings from a case study of the collaborative economy grassroots movement in Gothenburg, Sweden, to explore how the movements’ transformative capacity can be strengthened to enable transformations away from the growth-based economy, for the purposes of social-ecological sustainability. Our findings suggest that GIs demonstrate potential for post-growth transformations and that intermediary support and leadership are key to strengthen their transformative capacity. However, we also find that as GIs develop to influence regimes, they may face trade-offs that compromise their autonomy. If considered, we argue that the transformative capacities of GIs can be supported, to enact economic transformations toward a post-growth economy.

3. Digital infrastructure construction and household energy efficiency: Based on a quasi-natural experiment in China

Science of The Total Environment, Volume 911, 10 February 2024, 168544

Abstract

With respect to total emissions, the proportion of household carbon emissions exhibits an upward trend; therefore, to reduce carbon emissions and enhance energy efficiency, researchers should understand the reasons for the increase in household carbon emissions. This study, which is based on the construction of the “Broadband China” demonstration cities and the 2010–2018 China Family Panel Studies, applies a difference-in-differences method. It identifies the impact of digital infrastructure construction on indirect household energy consumption, carbon emissions, and energy efficiency.

The estimation results indicate that digital infrastructure construction significantly enhances household energy consumption and carbon emissions, and that it enhances the household energy efficiency pertaining to household carbon emissions and usage. Furthermore, the results indicate that households mainly enhance energy usage and efficiency by increasing developmental consumption. Additionally, this study noted that digital infrastructure construction affects household energy consumption and efficiency through the development of the consumer Internet and industrial Internet, which reshapes household consumption behavior and promotes the producers’ technological progress.

4. Identifying the interfaces between perceived multi-hazards and socio-ecological risks to strengthen local adaptations

Journal of Environmental Management, Volume 351, February 2024, 119708

Abstract

Multi-hazards are a great concern in the present world. Likewise, the coastal part of Bangladesh is highly vulnerable to multi-hazards, including waterlogging, surface water salinity, land use change, prolonged dry seasons, and groundwater salinity. Multi-hazards and associated risks make local adaptations more difficult over time. Thus, the purpose of this study is to explore the connection between multi-hazards and their associated socio-ecological risks in the southwestern coastal part of Bangladesh. Mixed-methods approaches were used to collect all the data, and statistical analyses were performed to analyze the data.

Results revealed that waterlogging significantly influenced local food access, poverty, child marriage, and divorce problems. Surface water salinity and land use change showed significant differences with the widening of salinity-affected areas. Waterlogging, land use change, and a prolonged dry season all showed significant differences in freshwater access. Prolonged dry seasons and groundwater salinity both have a significant impact on human health. Waterlogging and groundwater salinity significantly influence human migrations. These findings may strengthen local adaptation policies for salinity hazards, land use planning, household poverty, food access, livelihoods, water access, health effects, child marriage, and human migration. In addition, our findings indicate the potential to address the existing knowledge gaps pertaining to coastal hazards, risks, and adaptation issues.

5. Nonlinear effect of NOx concentration decrease on secondary aerosol formation in the Beijing-Tianjin-Hebei region: Evidence from smog chamber experiments and field observations

Science of The Total Environment, Volume 912, 20 February 2024, 168333

Abstract

During the COVID-19 lockdown in the Beijing-Tianjin-Hebei (BTH) region in China, large decrease in nitrogen oxides (NOx) emissions, especially in the transportation sector, could not avoid the occurrence of heavy PM2.5 pollution where nitrate dominated the PM2.5 mass increase. To experimentally reveal the effect of NOx control on the formation of PM2.5 secondary components (nitrate in particular), photochemical simulation experiments of mixed volatile organic compounds (VOCs) under various NOx concentrations with smog chamber were performed.

The proportions of gaseous precursors in the control experiment were comparable to ambient conditions typically observed in the BTH region. Under relatively constant VOCs concentrations, when the initial NOx concentration was reduced to 40% of that in the control experiment (labelled as NOx,0), the particle mass concentration was not significantly reduced, but when the initial NOx concentration decreased to 20 % of NOx,0, the mass concentration of particles as well as nitrate and organics showed a sudden decrease. A “critical point” where the mass concentration of secondary aerosol started to decline as the initial NOx concentration decreased, located at 0.2–0.4 NOx,0 (or 0.18–0.44 NO2,0) in smog chamber experiments.

The oxidation capacity and solar radiation intensity played key roles in the mass concentration and compositions of the formed particles. In field observations in the BTH region in the autumn and winter seasons, the “critical point” exist at 0.15–0.34 NO2,0, which coincided mostly with the laboratory simulation results. Our results suggest that a reduction of NOx emission by >60% could lead to significant reductions of secondary aerosol formation, which can be an effective way to further alleviate PM2.5 pollution in the BTH region.

6. Flood economic vulnerability and risk assessment at the urban mesoscale based on land use: A case study in Changsha, China

Journal of Environmental Management, Volume 351, February 2024, 119798

Abstract

With climate change and urbanization, flood disasters have significantly affected urban development worldwide. In this study, we developed a paradigm to assess flood economic vulnerability and risk at the urban mesoscale, focusing on urban land use. A hydrological simulation was used to evaluate flood hazards through inundation analyses, and a hazard-vulnerability matrix was applied to assess flood risk, enhancing the economic vulnerability assessment by quantifying the differing economic value and flood losses associated with different land types.

The case study of Wangchengpo, Changsha, China, found average total economic losses of 126.94 USD/m2, with the highest risk in the settlement core. Residential areas had the highest flood hazard, vulnerability, and losses (61.10% of the total loss); transportation areas accounted for 27.87% of the total economic losses due to their high flooding depth. Despite low inundation, industrial land showed greater economic vulnerability due to higher overall economic value (10.52% of the total). Our findings highlight the influence of land types and industry differences on flood vulnerability and the effectiveness of land-use inclusion in urban-mesoscale analyses of spatial flood characteristics. We identify critical areas with hazard and economic vulnerability for urban land and disaster prevention management and planning, helping to offer targeted flood control strategies to enhance urban resilience.

7. The effects of technological developments in transportation vehicles on air pollution mitigation of metropolitan cities: A case study of Istanbul

Science of The Total Environment, Volume 912, 20 February 2024, 168996

Abstract

This study investigates the impact of transportation vehicles on air pollution emissions in Istanbul, a metropolitan city in Türkiye. The TIMES (The Integrated MARKAL-EFOM System) Model has been used to determine the current level of air pollutants coming from the transportation sector, make future estimates, and assess the impact of various scenarios on air pollution emissions. Air pollutants such as carbon monoxide, nitrogen oxides, sulfur oxides, particulate matter, and non-methane volatile organic compounds are included in the model.

The amount of air pollution emissions discussed in this research were 74, 68, 13, 5, and 2 kt for NOx, CO, VOC, SO2, and PM, respectively, in the base year of 2016. In 2055, these emissions have shifted to 190, 98, 26, 8, and 5 kt, respectively. This means that emissions are predicted to increase between 1.4 and 2.6 times. According to model results, individual measures could decrease potential air pollution emissions for 2055 by up to 13 %. When all of the actions done within the pollutants of the study are combined, the total amount of emissions has decreased by 30.2 %, 24.3 %, 18.8 %, 5.3 % and 21.4 % for NOx, CO, VOC, SO2, and PM, respectively. This research emphasizes how critical it is to address metropolitan areas’ transportation-related air pollution. The number of such studies dealing with air pollution parameters using the TIMES Model is very few, and it is expected that this study will create important outputs for similar studies.

8. Long-term seawall barriers lead to the formation of an urban coastal lagoon with increased antibiotic resistome

Journal of Environmental Management, Volume 351, February 2024, 119721

Abstract

Urbanization has increased the spread of antibiotic resistance genes (ARGs) impacting urban aquatic ecosystems and threatening human health. However, an overview of the antibiotic resistome in artificial coastal lagoons formed by coastal seawall construction is unclear. This study investigated the resistome of sediment in a coastal lagoon, established for over 60 years and found that the composition of the resistome in the lagoon sediments associated with the seawall significantly differed from that of marine sediment external to the seawall.

Moreover, the diversity, number, relative abundance, and absolute abundance of the antibiotic resistome in the lagoon sediments were significantly higher compared to marine sediment. Network analyses revealed that more co-occurrences were found in lagoon sediment between bacterial communities, ARGs and mobile genetic elements (MGEs) than in marine sediments, suggesting that bacteria in lagoon sediments may be associated with multiple antibiotic resistances. Random forest and structural equation models showed that an increase in the absolute abundance of MGEs had a concomitant effect on the absolute abundance and diversity of ARGs, whereas increasing salinity decreased the absolute abundance of ARGs. This study provides a basis to assess the risk of resistome diffusion and persistence in an artificial coastal lagoon.

9. Neutral saccharides and hemicellulose over two urban sites in Indo-Gangetic Plain and Central Europe during winter

Science of The Total Environment, Volume 912, 20 February 2024, 168849

Abstract

Saccharides are ubiquitous organic compounds that are omnipresent in nature and are considered tracers of aerosol sources. Saccharides and hemicellulose were analyzed in the aerosols of two polluted regions (Allahabad, India and Sosnowiec, Poland). The chemical compositions of the compounds and their abundances were significantly different at the two sites. Levoglucosan was the most dominant saccharide present at both sites. Galactosan, anhydroglucofuranose, mannosan, glucose, arabitol, D-pinitol, sucrose, and trehalose were found in Allahabad samples in high abundance but were significantly lower than levoglucosan.

Mannosan, galactosan, arabinose, glycerol, and sucrose were significant compounds in Sosnowiec after dominating levoglucosan. The major sources of saccharides present in the Allahabad aerosols are hardwood and agricultural waste-burning emissions, whereas those at Sosnowiec are attributed to the burning of softwood (mainly gymnosperm trees), pine needles, or sporadically grass during the winter. Further, the chemical characteristics of hemicellulose remnants present in ambient aerosol at the Indian and European sites were analyzed and discussed. At both locations, hemicellulose was found using methanolysis of the filter samples; however, its state of preservation was poor. We believe that the primary sources of hemicellulose remnants are incomplete wood burning, crop straw, grass burning, or plant debris. Relatively poor preservation is associated with partial hemicellulose degradation when exposed to elevated temperatures or due to the oxidation and microbial degradation of plant fragments.

10. Effect-based monitoring of two rivers under urban and agricultural influence reveals a range of biological activities in sediment and water extracts

Journal of Environmental Management, Volume 351, February 2024, 119692

Abstract

Chemical contaminants, such as pesticides, pharmaceuticals and industrial compounds are ubiquitous in surface water and sediment in areas subject to human activity. While targeted chemical analysis is typically used for water and sediment quality monitoring, there is growing interest in applying effect-based methods with in vitro bioassays to capture the effects of all active contaminants in a sample. The current study evaluated the biological effects in surface water and sediment from two contrasting catchments in Aotearoa New Zealand, the highly urbanised Whau River catchment in Tāmaki Makaurau (Auckland) and the urban and mixed agricultural Koreti (New River) Estuary catchment.

Two complementary passive sampling devices, Chemcatcher for polar chemicals and polyethylene (PED) for non-polar chemicals, were applied to capture a wide range of contaminants in water, while composite sediment samples were collected at each sampling site. Bioassays indicative of induction of xenobiotic metabolism, receptor-mediated effects, genotoxicity, cytotoxicity and apical effects were applied to the water and sediment extracts. Most sediment extracts induced moderate to strong estrogenic and aryl hydrocarbon (AhR) activity, along with moderate toxicity to bacteria. The water extracts showed similar patterns to the sediment extracts, but with lower activity.

Generally, the polar Chemcatcher extracts showed greater estrogenic activity, photosynthesis inhibition and algal growth inhibition than the non-polar PED extracts, though the PED extracts showed greater AhR activity. The observed effects in the water extracts were compared to available ecological effect-based trigger values (EBT) to evaluate the potential risk. For the polar extracts, most sites in both catchments exceeded the EBT for estrogenicity, with many sites exceeding the EBTs for AhR activity and photosynthesis inhibition. Of the wide range of endpoints considered, estrogenic activity, AhR activity and herbicidal activity appear to be the primary risk drivers in both the Whau and Koreti Estuary catchments.

11. Classification of aerosols using particle linear depolarization ratio (PLDR) over seven urban locations of Asia

Chemosphere, Volume 350, February 2024, 141119

Abstract

Active lidar remote sensing has been used to obtain detailed and quantitative information about the properties of aerosols. We have analyzed the spatio-temporal classification of aerosols using the parameters of particle linear depolarization ratio and single scattering albedo from Aerosol Robotic Network (AERONET) over seven megacities of Asia namely; Lahore, Karachi, Kanpur, Pune, Beijing, Osaka, and Bandung.

We find that pollution aerosols dominate during the winter season in all the megacities. The concentrations, however, vary concerning the locations, i.e., 70–80% pollution aerosols are present over Lahore, 40–50% over Karachi, 90–95% over Kanpur and Pune, 60–70% and over Beijing and Osaka. Pure Dust (PD), Pollution Dominated Mixture (PDM), and Dust Dominated Mixture (DDM) are found to be dominant during spring and summer seasons.This proposes that dust over Asia normally exists as a mixture with pollution aerosols instead of pure form. We also find that black carbon (BC) dominated pollution aerosols.

12. Air quality and characterization of synoptic circulation weather patterns in a South American city from Argentina

Journal of Environmental Management, Volume 351, February 2024, 119722

Abstract

The potential cause-effect relationship between synoptic meteorological conditions and levels of criteria air pollutants, including CO, NO2, O3, PM10, PM2.5 and SO2, in Bahia Blanca, Argentina, was assessed for the period of 2018–2019. Daily back-trajectories and global meteorological data fields were employed to characterize the primary transport paths of air masses reaching the study site, and to identify the synoptic meteorological patterns responsible for these atmospheric circulations.

Time series of surface-level meteorological parameters and midday mixing layer height were collected to examine the impact of the synoptic meteorological patterns on local meteorology. Furthermore, the NAAPS global aerosol model was utilized to identify days when contributions from long-range transport processes, such as dust and/or biomass burning smoke, impacted air quality. By applying this methodology, it was determined that the air masses coming from the N, NW and W regions significantly contributed to increased mean concentrations of coarse particles in this area through long-range transport events involving dust and smoke. Indeed, the high average levels of PM10 recorded in 2018–2019 (annual mean values of 47 and 52 μg/m3, respectively) represent the main air quality concern in Bahía Blanca. Moreover, PM10, PM2.5 and NO2 emissions should be reduced in order to meet recommended air quality guidelines. On the other hand, the results from this study suggest that the sources and meteorological processes leading to the increase in the concentrations of CO and SO2 have a local-regional origin, although these air pollutants did not reach high values probably as a consequence of the strong wind speed registered in this region during any synoptic meteorological pattern.

13. Hydroxylated transformation products of pharmaceutical active compounds: Generation from processes used in wastewater treatment plants and its environmental monitoring

Chemosphere, Volume 349, February 2024, 140753

Abstract

Pharmaceutical active compounds (PhACs) are organic pollutants detected in wastewater and aquatic environments worldwide in concentrations ranging from ng L−1 to μg L−1. Wastewater effluents containing PhACs residues is discharged in municipal sewage and, subsequently collected in municipal wastewater treatment plants (WWTPs) where are not entirely removed. Thus, PhACs and its transformation products (TPs) are discharged into water bodies. In the current work, the transformation of PhACs under treatments used in municipal WWTPs such as biological, photolysis, chlorination, and ozonation processes was reviewed.

Data set of the major transformation pathways were obtained of studies that performed the PhACs removal and TPs monitoring during batch-scale experiments using gas and liquid chromatography coupled with tandem mass spectrometry (GC/LC-MS/MS). Several transformation pathways as dealkylation, hydroxylation, oxidation, acetylation, aromatic ring opening, chlorination, dehalogenation, photo-substitution, and ozone attack reactions were identified during the transformation of PhACs.

Especially, hydroxylation reaction was identified as transformation pathway in all the processes. During the elucidation of hydroxylated TPs several isobaric compounds as monohydroxylated and dihydroxylated were identified. However, hydroxylated TPs monitoring in wastewater and aquatic environments is a topic scarcely studied due to that has no environmental significance, lack of available analytic standars of hydroxylated TPs and lack of analytic methods for their identification. Thus, screening strategy for environmental monitoring of hydroxylated TPs was proposed through target and suspect screening using GC/LC-MS/MS systems. In the next years, more studies on the hydroxylated TPs monitoring are necessary for its detection in WWTPs effluents as well as studies on their environmental effects in aquatic environments.

14. A green path towards sustainable development: The impact of carbon emissions trading system on urban green transformation development

Journal of Cleaner Production, Volume 442, 25 February 2024, 140943

Abstract

This study aims to explore the direct and indirect impacts of the Carbon Emission Trading System (CETS) on the green transition development (GTD) of Chinese cities. This paper constructs a GTD evaluation system from the perspective of prevention and governance at the source, in terms of carbon reduction, pollution reduction, green expansion and growth, and measures the GTD performance of 281 cities based on the EW-TOPSIS model. It is found that the average increase in GTD of the sample cities from 2006 to 2020 is 3.40 %, the GTD progress of the 281 cities has a considerable positive spatial autocorrelation, with the GTD progress of the CETS pilot cities being significantly bigger than that of the non-pilot cities.

Further this paper adopts the spatial difference model (S-DID) to scientifically identify the influence mechanism and heterogeneity of the direct and spatial effects of CETS on city GTD, and the results show that CETS has a positive effect on the GTD of both local and neighboring cities. Propensity score matching (PSM) is used to further corroborate these findings. The study also shows that CETS improves local GTD by promoting green innovation, rationalizing industrial structures, and enhancing energy efficiency in cities. Nevertheless, the ensuing siphon effect hinders nearby cities’ levels of energy efficiency, industrial structure rationalization, and green innovation. The policy effects of CETS are more significant in large cities, eastern cities, old industrial areas, and non-resource-based cities. CETS can work in synergy with smart city construction, low-carbon city pilot policies, and emission trading policies to accelerate the process of GTD.

15. The impact of digital economy on carbon total factor productivity: A spatial analysis of major urban agglomerations in China

Journal of Environmental Management, Volume 351, February 2024, 119765

Abstract

Amid global climate imperatives and intensified economic competition, pivoting from China’s conventional growth paradigms to innovative economic catalysts emerges as pivotal for its transformative agenda. Drawing on panel data from 141 principal urban conglomerates spanning 2011–2021, this investigation delves into the intricate nexus between the digital economy and carbon total factor productivity. Our empirical analysis unveils a U-shaped trajectory characterizing the digital economy – carbon total factor productivity interplay, accompanied by a congruent spatial spillover dynamic.

While digital economy fortifies environmental governance mechanisms through amplified data and media channels, such regulatory frameworks, albeit efficacious in emission abatement, may inadvertently impede economic vitality, thus attenuating carbon total factor productivity. Progressing from digital economy’s foundational phase to its comprehensive deployment, its reverberations on capital productivity manifest in a U-shaped curve, invigorating local carbon total factor productivity while potentially undermining adjacent regions. This digital economy – carbon total factor productivity interrelation is accentuated in advanced, non-resource-reliant metropolises with subdued innovation propensities. This discourse proffers nuanced policy implications for sculpting digital economy trajectories and bolstering carbon total factor productivity in a sustainable context.

16. The impact of urban polycentricity on carbon emissions: A case study of the Yangtze River Delta Region in China

Journal of Cleaner Production, Volume 442, 25 February 2024, 141127

Abstract

In the context of increasing global carbon emissions(CEs) and widespread restructuring of the urban spatial structure, it is worth exploring whether polycentricity can reduce urban CEs. Given the previous controversies and the lack of sufficient evidence regarding the relationship and underlying mechanisms between polycentricity and CEs, the aim of this study is to address these gaps. In this study, topographic scanning population data and non-parametric methods are used to identify urban centers and to calculate the multi-center index of the cities in the Yangtze River Delta (YRD) region. Using a geographical gauging approach, a correlation between urban polycentricity and urban CE based on the identification of their spatial impacts is subsequently investigated. The findings of this study indicate the following: initially, urban polycentricity is linked to an increase in CEs within the city.

Furthermore, there may be spillover effects, leading to the potential for polycentricity to reduce CE in surrounding urban areas. Urban polycentricity can enhance industrial agglomeration, thereby reducing urban CEs. Additionally, the improvement of urban transportation infrastructure contributes to an increase in the CE augmentation effect of urban polycentricity. The direct and indirect effects of urban polycentricity on CEs are heterogeneous. Moreover, both the direct and indirect effects of polycentricity on CEs are anticipated to increase proportionally as the size and economic status of the city increase. The aforementioned results demonstrate that there is a correlation between the polycentric nature of urban spatial configuration and the severity of CEs in metropolitan areas. Urban planners should consider the need to propose appropriate strategies for optimizing the spatial structure of cities in different phases of development. In addition, they should propose strategies for synergistic spatial adjustments to urban agglomerations.

INDUSTRIAL AREA ENVIRONMENT / MÔI TRƯỜNG KHU CÔNG NGHIỆP

1. Chlorella pyrenoidosa as a potential bioremediator: Its tolerance and molecular responses to cadmium and lead

Science of The Total Environment, Volume 912, 20 February 2024, 168712

Abstract

Heavy metal contamination negatively affects plants and animals in water as well as soils. Some microalgae can remove heavy metal contaminants from wastewater. The aim of this study was to screen green microalgae (GM) to identify those that tolerate high concentrations of toxic heavy metals in water as possible candidates for phytoremediation. Analyses of the tolerance, physiological parameters, ultrastructure, and transcriptomes of GM under Cd/Pb treatments were conducted. Compared with the other GM, Chlorella pyrenoidosa showed stronger tolerance to high concentrations of Cd/Pb. The reduced glutathione content and peroxidase activity were higher in C. pyrenoidosa than those in the other GM. Ultrastructural observations showed that, compared with other GM, C. pyrenoidosa had less damage to the cell surface and interior under Cd/Pb toxicity.

Transcriptome analyses indicated that the “peroxisome” and “sulfur metabolism” pathways were enriched with differentially expressed genes under Cd/Pb treatments, and that CpSAT, CpSBP, CpKAT2, Cp2HPCL, CpACOX, CpACOX2, and CpACOX4, all of which encode antioxidant enzymes, were up-regulated under Cd/Pb treatments. These results show that C. pyrenoidosa has potential applications in the remediation of polluted water, and indicate that antioxidant enzymes contribute to Cd/Pb detoxification. These findings will be useful for producing algal strains for the purpose of bioremediation in water contamination.

2. Environmental policy effects of the carbon tax, subsidy, and policy combinations of China’s textile industry: Evidence from the DSGE model

Journal of Cleaner Production, Volume 439, 1 February 2024, 140791

Abstract

To evaluate the effect of environmental policies in China’s textile industry and explore the optimization path of environmental policies, this paper constructs an open dynamic stochastic general equilibrium (DSGE) model that includes the textile industry’s carbon tax and emission reduction subsidy policy. First, based on the model, this paper focuses on the impacts of a single carbon tax policy, a single emission reduction subsidy policy, and a mixture of the two on the economic and environmental quality of the textile industry. Subsequently, the transmission mechanism of the textile industry environmental policy is analyzed, and the optimization suggestions for the effect of China’s textile industry policy are put forward.

The results suggest that a moderate carbon tax policy can effectively restrain carbon emissions, an excessive one can hinder the industrial economy, and carbon subsidies have the opposite effect. The policy combination of high carbon tax and low subsidy can improve environmental quality in a short time. In contrast, low carbon tax and high subsidies can help to achieve economic development goals. Finally, this study proposes that combining industrial production and pollution emissions and dynamically adjusting the combination of policy tools can enhance the effectiveness of environmental protection policies in the textile industry and realize an actual “win-win” situation regarding environmental quality improvement and economic growth.

3. Science of The Total Environment, Comparative study on anthropogenic impacts on soil PAHs: Accumulation and source apportionment in tourist and industrial cities in Hebei Province, China

Volume 912, 20 February 2024, 168435

Abstract

Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous organic contaminants in urban soils. The accumulation and source identifications of PAHs within a city have been frequently studied. However, impacts of urbanization development modes on PAHs accumulation patterns by taking a city as a whole have been seldom reported. Four cities with two development modes in Hebei province, Chengde and Zhangjiakou (tourist cities) and Handan and Tangshan (industrial cities), were selected.

The concentrations of 16 priority PAHs in soils in the study areas were investigated. The results showed that the average concentrations of ΣPAHs in Handan (2517 μg/kg) and Tangshan (2256 μg/kg) were more than twice of those in Chengde (696 μg/kg) and Zhangjiakou (926 μg/kg) approximately. Lines of evidence, provided by a combination of diagnostic ratios, pairwise correlation, and PMF methods, revealed that the dominant sources of PAHs in either city were industrial emission, vehicle emission, and petrogenic/biogenic process but with different proportions. Linear fittings based on Bayesian kernel machine regression analysis (BKMR) were constructed to illustrate the impact of industrialization on PAHs accumulation. The probability of excessing the 10 % (376 μg/kg) and 50 % (1138 μg/kg) of current ∑.

4. Can financial agglomeration curb carbon emissions reduction from agricultural sector in China? Analyzing the role of industrial structure and digital finance

Journal of Cleaner Production, Volume 440, 10 February 2024, 140862

Abstract

As China enters the process of agricultural modernization, the problem of carbon emissions from agricultural sectors has become increasingly prominent, and the government and academia urgently need to take action. In this context, this study extends the literature through a new perspective of China’s financial agglomeration construction that examines the actual role of financial agglomeration on agricultural carbon emissions reduction by using two-way fixed effect model and threshold effect model based on the panel data of 30 provinces in China from 2011 to 2019.

Data statistics show that China has formed a multi-center development pattern with Beijing-Tianjin-Hebei, Yangtze River Delta, Guangdong-Hong Kong-Macao as highly financial agglomeration under the influence of different locations, factor endowments and development foundations. Further empirical model estimates reveal the following main findings. Firstly, the effects of financial agglomeration on total agricultural carbon intensity (TACI), agricultural greenhouse gas carbon intensity (AGCI), agricultural energy carbon emission intensity (AECI), and agricultural input factors carbon intensity (ASCI) show an inverted U-shaped curve that from irritating to inhibiting.

That is, financial agglomeration is conducive to slowing down agricultural carbon emissions. Secondly, financial agglomeration has a significant inhibitory effect on TACI, AGCI, AECI and ASCI in Beijing and Shanghai. Thirdly, when the industrial structure is more reasonable or the digital finance is more developed, the effect of financial agglomeration on reducing agricultural carbon emissions is stronger. Based on the current research results, promoting the construction of financial agglomeration is an effective way to promote agricultural carbon emissions reduction, and it is suggested that the government design effective systems and policies to slow down the carbon emissions in the agricultural sector.

5. Improved estimation of CO2 emissions from thermal power plants based on OCO-2 XCO2 retrieval using inline plume simulation

Science of The Total Environment, Volume 913, 25 February 2024, 169586

Abstract

CO2 emissions from power plants are the dominant source of global CO2 emissions, thus in the context of global warming, accurate estimation of CO2 emissions from power plants is essential for the effective control of carbon emissions. Based on the XCO2 retrievals from the Orbiting Carbon Observatory 2 (OCO-2) and the Gaussian Plume Model (GPM), a series of studies have been carried out to estimate CO2 emission from power plants. However, the GPM is an ideal model, and there are a number of assumptions that need to be made when using this model, resulting in large uncertainties in the inverted emissions.

Here, based on 6 cases of power plant plumes observed by the OCO-2 satellite over the Yangtze River Delta, China, we use an inline plume rise module coupled in the Community Multi-scale Air Quality model (CMAQ) to simulate the plumes and invert the emissions, and compare the simulated plumes and inverted emissions using the GPM model. We found that CO2 emissions can be significantly overestimated or underestimated based on the GPM simulations, and that the CMAQ inline plume simulation could significantly improve the estimates. However, the simulation bias in wind speed can significantly affect the inversion results. These results indicate that accurate meteorological field and plume simulations are critical for future inversion of point source emissions.

6. United States’ 2050 carbon neutrality: Myth or reality? Evaluating the impact of high-tech industries and green electricity

Journal of Cleaner Production, Volume 440, 10 February 2024, 140855

Abstract

Despite its economic prosperity, the United States has encountered challenges in promoting ecological quality. Therefore, it is imperative for the United States to acknowledge that maintaining its economic accomplishments requires concurrent efforts to safeguard its ecological quality. To solve this challenge, this study aims to scrutinize the impact of green electricity, globalization (in terms of trade and finance), and high technology on the United States’ load capacity factor. Employing quarterly frequency data spanning from 1990 to 2020, this research utilizes cutting-edge quantile-based econometric techniques, including wavelet quantile regression, which effectively captures interrelationships across various periods and quantiles. Additionally, it employs quantile causality and quantile-on-quantile regression methods, robust in handling nonlinearity, to assess the ecological repercussions of these variables. The overarching findings reveal that, high tech, financial development, economic growth, and globalization (both in trade and finance) lessen ecological quality. Conversely, green electricity consumption consistently promotes ecological quality. Furthermore, the quantile causality results unveil evidence of feedback causality between the load capacity factor and its drivers, underpinning the need for policy formulation based on these findings.

7. Anthropogenic impacts on urban blue space and its reciprocal effect on human and socio-ecological health

Journal of Environmental Management, Volume 351, February 2024, 119727

Abstract

Quantifying anthropogenic impacts on blue space (BS) and its effect on human and socio-ecological health was least explored. The present study aimed to do this in reference to the urban BS transformation scenario of Eastern India. To measure BS transformation, Landsat image-based water indices were run from 1990 to 2021. Anthropogenic impact score (AIS) and 7 components scores of 78 selected BS on 70 parameters related data driven from the field. Total 345 respondents were taken for human and socio-ecological health assessment. For this, depression (DEP), anxiety (ANX), stress (STR), physical activities (PA), social capital (SC), therapeutic landscape (TL) and environment building (EB) parameters were taken. The result exhibited that BS was reduced. About 50% of urban core BS was reported highly impacted. Human and socio-ecological health was identified as good in proximity to BS, but it was observed better in the cases of larger peripheral BS. AIS on BS was found to be positively associated with mental health (0.47–0.63) and negatively associated with PA, SC, TL and EB (−0.50 to −0.90). Standard residual in ordinary least square was reported low (−1.5 to 1.5) in 95% BS. Therefore, BS health restoration and management is crucial for sustaining the living environment.

8. Compatibility assessment of thermal energy storage integration into industrial heat supply and recovery systems

Journal of Cleaner Production, Volume 440, 10 February 2024, 140932

Abstract

Thermal energy storage (TES) systems can be used for recovering industrial waste heat and increasing energy efficiency, especially when coupled to batch thermal processes. Stratified water thermal storage tanks are the preferred technology for low-temperature applications, while molten salts are commonly used in medium and high-temperature applications with large storage capacities. No clear consensus exists on the appropriate TES technology for different industrial demands characteristics and their respective heat supply systems for medium and high-temperature applications.

The present study analyzes several industrial sectors and their thermal processes, analyzing their temperature ranges, heat demands, and available TES technologies, which are classified by their operational conditions. The study presents two novel indicators for a preliminar compatibility assessment between TES and industrial sectors: a temperature compatibility indicator and exergy efficiency for TES and thermal processes. The results show that low and medium-temperature applications such as food, chemical, or textile industries exhibit high compatibilities with water (over 64%), high-temperature PCM (over 61%), and solid-state TES (100%), whereas molten salts and chemical looping demonstrate lower compatibility (below 24%).

The exergy analysis for industrial cases shows that a lower temperature operating range for a TES induces low exergy efficiency. Regarding this scenario, high-temperature cPCM reaches efficiencies of over 44% for mid and high-temperature processes. Conversely, solid-state TES emerges as the most viable option for integration in high-temperature industries, exhibiting an efficiency of 62% with minimal exergy losses. The indicators defined in this study can be used for an early evaluation of TES integration in industrial applications, thus promoting emerging technologies selection through a quantitative comparison of the compatibility metrics.

9. High-resolution emission inventory of biogenic volatile organic compounds for rapidly urbanizing areas: A case of Shenzhen megacity, China

Journal of Environmental Management, Volume 351, February 2024, 119754

Abstract

The effects of volatile organic compounds on urban air quality and the ozone have been widely acknowledged, and the contributions of relevant biogenic sources are currently receiving rising attentions. However, inventories of biogenic volatile organic compounds (BVOCs) are in fact limited for the environmental management of megacities. In this study, we provided an estimation of BVOC emissions and their spatial characteristics in a typical urbanized area, Shenzhen megacity, China, based on an in-depth vegetation investigation and using remote sensing data. The total BVOC emission in Shenzhen in 2019 was estimated to be 3.84 × 109 g C, of which isoprene contributed to about 24.4%, monoterpenes about 44.4%, sesquiterpenes about 1.9%, and other VOCs (OVOCs) about 29.3%.

Metropolitan BVOC emissions exhibited a seasonal pattern with a peak in July and a decline in January. They were mainly derived from the less built-up areas (88.9% of BVOC emissions). Estimated BVOCs comprised around 5.2% of the total municipal VOC emissions in 2019. This percentage may increase as more green spaces emerge and anthropogenic emissions decrease in built-up areas. Furthermore, synergistic effects existed between BVOC emissions and relevant vegetation-based ecosystem services (e.g., air purification, carbon fixation). Greening during urban sprawl should be based on a trade-off between BVOC emissions and ecosystem benefits of urban green spaces. The results suggested that urban greening in Shenzhen, and like other cities as well, need to account for BVOC contributions to ozone. Meanwhile, greening cites should adopt proactive environmental management by using plant species with low BVOC emissions to maintain urban ecosystem services while avoid further degradation to ozone pollution.

10. The effect of heterogeneity on environmental efficiency: Evidence from European industries across sectors

Journal of Cleaner Production, Volume 441, 15 February 2024, 141036

Abstract

Due to the immense pressure of environmental pollution, economic growth and energy usage, green growth is recognized as the fundamental development strategy in Europe. This paper assesses environmental efficiency (ENE) of 54 industries from 28 European countries across the three sectors of an economy over the 2000–2014 period using a non-radial directional distance function (DDF). The aim of this study is to shed light and provide a deeper understanding of the different levels of technological heterogeneity that exist among industries by incorporating the metafrontier approach under distinct sector and country-specific production frontiers. The results reveal that industries present higher levels of environmental efficiency within their sectors while manufacturing industries achieve the lowest progress in environmental efficiency. Thus, it is critical to introduce and implement sector-oriented policies rather than common guidelines for all European countries.

11. Interpretable attention-based multi-encoder transformer based QSPR model for assessing toxicity and environmental impact of chemicals

Chemosphere, Volume 350, February 2024, 141086

Abstract

The rising demand from consumer goods and pharmaceutical industry is driving a fast expansion of newly developed chemicals. The conventional toxicity testing of unknown chemicals is expensive, time-consuming, and raises ethical concerns. The quantitative structure–property relationship (QSPR) is an efficient computational method because it saves time, resources, and animal experimentation.

Advances in machine learning have improved chemical analysis in QSPR studies, but the real-world application of machine learning-based QSPR studies was limited by the unexplainable ‘black box’ feature of the machine learnings. In this study, multi-encoder structure-to-toxicity (S2T)-transformer based QSPR model was developed to estimate the properties of polychlorinated biphenyls (PCBs) and endocrine disrupting chemicals (EDCs). Simplified molecular input line entry systems (SMILES) and molecular descriptors calculated by the Dragon 6 software, were simultaneously considered as input of QSPR model. Furthermore, an attention-based framework is proposed to describe the relationship between the molecular structure and toxicity of hazardous chemicals. The S2T-transformer model achieved the highest R2 scores of 0.918, 0.856, and 0.907 for logarithm of octanol-water partition coefficient (Log KOW), octanol-air partition coefficient (Log KOA), and bioconcentration factor (Log BCF) estimation of PCBs, respectively. Moreover, the attention weights were able to properly interpret the lateral (meta, para) chlorination associated with PCBs toxicity and environmental impact.

12. Evaluating the roles of energy innovation, fossil fuel costs and environmental compliance towards energy transition in advanced industrial economies

Journal of Environmental Management, Volume 351, February 2024, 119709

Abstract

Given the dire state of climate change, investigating key elements that impact the energy transition process and help monitor progress in greenhouse gas emissions to achieve environmental sustainability is of critical importance. The current study explores the association between energy transition, compliance with environmental agreements, fossil fuels costs, environmental technologies, economic growth, and environmental degradation in G20 economies from 1995 to 2019. Our findings from extensive econometric analysis reveal that economic growth, environmental innovation, renewable energy, and environmental compliance facilitate while fossil fuels and environmental degradation hinder the energy transition process. Our findings conclude that developed countries must focus on alternate energy resources to overcome environmental challenges and subsidize renewable energy and environmental technologies to replace fossil fuels with green energy resources methodologically. Further, policy measures have been discussed in detail in the study.

13. Changes in industrial air pollution and the onset of childhood asthma in Quebec, Canada

Environmental Research, Volume 243, 15 February 2024, 117831

Abstract

Ambient air pollution has been associated with asthma onset and exacerbation in children. Whether improvement in air quality due to reduced industrial emissions has resulted in improved health outcomes such as asthma in some localities has usually been assessed indirectly with studies on between-subject comparisons of air pollution from all sources and health outcomes. In this study we directly assessed, within small areas in the province of Quebec (Canada), the influence of changes in local industrial fine particulate matter (PM2.5), nitrogen dioxide (NO2), and sulfur dioxide (SO2) concentrations, on changes in annual asthma onset rates in children (≤12 years old) with a longitudinal ecological design. We identified the yearly number of new cases of childhood asthma in 1282 small areas (census tracts or local community service centers) for the years 2002, 2004, 2005, 2006, and 2015.

Annual average concentrations of industrial air pollutants for each of the geographic areas, and three sectors (i.e., pulp and paper mills, petroleum refineries, and metal smelters) were estimated by the Polair3D chemical transport model. Fixed-effects negative binomial models adjusted for household income were used to assess associations; additional adjustments for environmental tobacco smoke, background pollutant concentrations, vegetation coverage, and sociodemographic characteristics were conducted in sensitivity analyses. The incidence rate ratios (IRR) for childhood asthma onset for the interquartile increase in total industrial PM2.5, NO2, and SO2 were 1.016 (95% confidence interval, CI: 1.006–1.026), 1.063 (1.045–1.090), and 1.048 (1.031–1.080), respectively. Positive associations were also found with pollutant concentrations from most individual sectors. Results suggest that changes in industrial pollutant concentrations influence childhood asthma onset rates in small localities.

14. Transformation behavior of heavy metal during Co-thermal treatment of hazardous waste incineration fly ash and slag/electroplating sludge

Journal of Environmental Management, Volume 351, February 2024, 119730

Abstract

In this study, the behavior of heavy metal transformation during the co-thermal treatment of hazardous waste incineration fly ash (HWIFA) and Fe-containing hazardous waste (including hazardous waste incineration bottom slag (HWIBS) and electroplating sludge (ES)) was investigated. The findings demonstrated that such a treatment effectively reduced the static leaching toxicity of Cr and Pb. Moreover, when the treatment temperature exceeded 1000 °C, the co-thermal treated sample exhibited low concentrations of dynamically leached Cr, Pb, and Zn, indicating that these heavy metals were successful detoxified.

Thermodynamic analyses and phase transformation results suggested that the formation of spinel and the gradual disappearance of chromium dioxide in the presence of Fe-containing hazardous wastes contributed to the solidification of chromium. Additionally, the efficient detoxification of Pb and Zn was attributed to their volatilization and entry into the liquid phase during the co-thermal treatment process. Therefore, this study sets an excellent example of the co-thermal treatment of hazardous wastes and the control of heavy metal pollution during the treatment process.

15. Parameterization proposal to determine the feasibility of geographic areas for the green hydrogen industry under socio-environmental and technical constraints in Chile

International Journal of Hydrogen Energy, Volume 50, Part B, 2 January 2024, Pages 578-598

Abstract

Chile, abundant in solar and wind energy resources, presents significant potential for the production of green hydrogen, a promising renewable energy vector. However, realizing this potential requires an understanding of the most suitable locations for the installation of green hydrogen industries. This study proposes a quantitative methodology that identifies and ranks potential public lands for industrial use, based on a range of technical parameters (such as solar and wind availability) and socio-environmental considerations (including land use restrictions and population density).

The results reveal optimal locations that can facilitate informed, sustainable decision-making for large-scale green hydrogen implementation in Chile. While this methodology does not replace project-specific technical or environmental impact studies, it provides a flexible, general classification to guide initial site selection. Notably, this approach can be applied to other regions worldwide with abundant solar and wind resources, such as Australia and Northern Africa, promoting more effective and sustainable global decision-making for green hydrogen production.

16. Investigating the efficiency of a two-stage anaerobic-aerobic process for the treatment of confectionery industry wastewaters with simultaneous production of biohydrogen and polyhydroxyalkanoates.

Environmental Research, Available online 22 February 2024, 118526

Abstract

The scope of the current study was to investigate the efficiency of a two-stage anaerobic-aerobic process for the simultaneous treatment and valorization of selective wastewater streams from a confectionary industry. The specific wastewater (CIW) was a mixture of the rinsing eluting during washing of the cauldrons were jellies and syrups were produced, and contained mainly readily fermentable carbohydrates, being thus of high organic load. The first stage of the process was the dark fermentation (DF) of the CIW in continuous, attached-biomass systems, in which the effect on hydrogen yields and distribution of metabolites were studied for different packing materials (ceramic or plastic), hydraulic retention times (12 h–30 h) and feed substrate concentration (20 g COD/L- 50 g COD/L).

In the second stage, the effectiveness of the aerobic treatment of the DF effluents was evaluated in terms of the reduction of the organic load and the production of polyhydroxyalkanoates (PHAs) through an enriched mixed microbial culture (MMC). The MMC was developed in a continuous draw and fill system, in which the accumulation potential of PHAs was studied. It was shown that the hydrogen production rates decreased for increasing substrate concentration and hydraulic retention times (HRTs), with a maximum of 12.70 ± 0.35 m3 H2/m3 initial CIW achieved for the lowest HRT and feed concentration, using ceramic beads as packing material.

Butyrate, acetate and lactate were the main metabolites generated in all cases, in different ratios. The distribution of metabolites during DF was shown to highly affect the efficiency of the second process in terms of both the reduction of organic load and the PHAs yields. The highest removal of organic load achieved after 48 h of aerobic treatment was 84.0 ± 0.9 %, whereas the maximum PHAs yield was 21.46 ± 0.13 kg PHAs/m3 initial CIW.

CHUYÊN TRANG QUẢN LÝ MÔI TRƯỜNG
Tạp chí Môi trường và Đô thị Việt Nam