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SSRN 2023年

作者： Chen, Bohan Li, Yong Luo, Zhizhan Lei, Mengen Zhang, Xiaolei Li, Ji Shenzhen518055 China Shenzhen Key Laboratory of Water Resource Application and Environmental Pollution Control Harbin Institute of Technology Shenzhen Graduate School Shenzhen518055 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China

In this study, granular sludge (GS) dominated by denitrifying glycogen-accumulating organisms (DGAOs) formed after 136 days of cultivation in a sequencing batch reactor under the low phosphate influent condition. The average phosphorus removal and denitrification efficiency in the stable operation stage were 84.9% and 54.3%, respectively. The percentages of DGAOs and denitrifying phosphate-accumulating organisms in GS were 17.1% and 0.5%, respectively. The main species of DGAOs in GS were Candidatus Competibacter and Candidatus Contendobacter. The excessive secretion of exopolysaccharide induced by the enrichment of DGAOs improved the viscosity of extracellular polymeric substances, thus promoting the initial sludge granulation and subsequent rapid enlargement of GS. The X-ray diffraction analysis revealed that the main composition of the inorganic crystal inside GS was CaCO3. The metabolism of DGAOs caused a high pH environment, leading to the preferential formation of CaCO3. This study reveals the important role of DGAOs in sludge granulation. © 2023, The Authors. All rights reserved.

关键词： Calcium carbonate

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Degradation of polyacrylamide (PAM) and methane production by mesophilic and thermophilic anaerobic digestion: Effect of temperature and concentration

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Frontiers of environmental Science & Engineering 2020年第6期14卷 75-85页

作者： Mona Akbar Muhammad Farooq Saleem Khan Ling Qian Hui Wang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Sino-Japan Friendship Center for Environmental Protection Beijing 100029China

Polyacrylamide(PAM)is generally employed in wastewater treatment processes such as sludge dewatering and therefore exists in the ***,it degrades slowly and can deteriorate methane yield during anaerobic digestion(AD).The impact or fate of PAM in AD under thermophilic conditions is still *** study mainly focuses on PAM degradation and enhanced methane production from PAM-added sludge during 15 days of thermophilic(55°C)AD compared to mesophilic(35°C)*** and PAM dose from 10 to 50 g/kg TSS were *** results showed that PAM degraded by 76%to 78%with acrylamide(AM)content of 0.2 to 3.3 mg/L in thermophilic ***,it degraded only 21%to 30%with AM content of 0.5 to 7.2 mg/L in mesophilic *** methane yield was almost 230 to 238.4 mL/g VSS on the 8th day in thermophilic AD but was 115.2 to 128.6 mL/g VSS in mesophilic *** investigation revealed that thermophilic AD with continuous stirring not only enhanced PAM degradation but also boosted the organics release from the sludge with added PAM and gave higher methane yield than mesophilic AD.

关键词： Polyacrylamide(PAM)degradation Acrylamide(AM) Mesophilic anaerobic digestion Thermophilic anaerobic digestion Methane production

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Significant contribution of spring northwest transport to volatile organic compounds in Beijing

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Journal of environmental Sciences 2021年第6期33卷 169-181页

作者： Dan Yao Guiqian Tang Yinghong Wang Yuan Yang Lili Wang Tianzeng Chen Hong He Yuesi Wang Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

High values of ozone(O_(3))occur frequently in the dry spring season;thus,understanding the evolution characteristics of volatile organic compounds(VOCs)in spring is of great significance for preventing O_(3)*** this study,a total of 101 VOCs from April 16 to May 21,2019,were quantified using an online gas chromatography mass spectrometer/flame ionization detector(GCMS/FID).The results indicated that the observed concentration of total VOCs(TVOCs)was 30.4±17.0 ppbv,and it was dominated by alkanes(44.3%),followed by oxygenated VOCs(OVOCs)(17.4%),halocarbons(12.7%),aromatics(9.5%),alkenes(8.2%),acetylene(5.3%)and carbon disulfide(2.5%).The average mixing ratio of VOCs showed obvious diurnal variation(high at night,low during daytime).We conducted a source apportionment study based on 32 major VOCs using positive matrix factorization(PMF),and coal+biomass burning(25.2%),diesel exhaust(16.0%),gasoline exhaust+evaporation(17.4%),secondary+long-lived species(16.7%),biogenic sources(4.3%),industrial emissions(9.3%)and solvent use(11.2%)were identified as major sources of *** addition to local emissions,most of the atmospheric VOCs were derived from long-distance air masses(65.7%),and the average mixing ratio of VOCs in the northwest direction was 29.4 *** with the results of the potential source contribution function(PSCF)indicate that research should focus on the local emissions of combustion,transportation sources and solvents usage to control atmospheric ***,transmission of the northwest air mass is an important component that cannot be ignored during spring in Beijing.

关键词： VOCs Source apportionment Beijing Spring Northwest transport

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Toxic effect of perfluorooctane sulfonate on plants in vertical-flow constructed wetlands

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Journal of environmental Sciences 2020年第6期32卷 176-186页

作者： Rong Li Tianhao Tang Weichuan Qiao Jun Huang Department of Environmental Engineering College of Biology and the EnvironmentNanjing Forestry UniversityNanjing 210037China School of Environment Beijing Key Laboratory for Emerging Organic Contaminants Control(BKLEOC)State Key Joint Laboratory of Environment Simulation and Pollution Control(SKLESPC)Tsinghua UniversityBeijing 100084China

Per-and polyfluoroalkyl substances(PFASs)can be taken up and bioaccumulated in plants,but the toxic mechanisms of PFASs on wetland plants are still *** present study,the toxic influences of perfluorooctane sulfonate(PFOS)on Eichhornia crassipes(***)and Cy perus alternifolius(***)in a vertical-sub surface-flow constructed wetland were *** results showed that *** was more tolerant to PFOS stress than ***,and the growth and chlorophyll synthesis of the two plants were promoted by low concentration(<0.1 mg/L)of PFOS,and the chlorophyll synthesis was inhibited by high concentration(10 mg/L)of PFOS but the growth did not change *** catalase activity and malondialdehyde content in the leaves of the two plants increased,peroxidase activity decreased under exposure to high concentrations of PFOS,and superoxide dismutase activity did not *** PFOS stress,the membrane of plant leaves and the cell structure of the two wetland plants were destroyed,and the mitochondrial contour of root cells became *** analysis showed that the expression levels of genes related to cell wall formation,the cell apoptosis pathway,material synthesis,and metabolism in the plants were changed by *** in fluorogenic quantitative real time polymerase chain reaction(RT-qPCR)also confirmed that the photosynthesis system of *** was inhibited,while that of *** was promoted.

关键词： Perfluorooctane sulfonate Wetland plants Toxicity Vertical-flow constructed wetlands Effect

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Al and Mn speciation changes during the pre-oxidation with potassium permanganate and coagulation removing natural organic matter and its membrane fouling behavior

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Chemosphere 2024年 346卷 140641页

作者： Yang, Min Li, Kun Wang, Tianyu Liu, Ruiping Hu, Chengzhi Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China

In this study, we systematically explore coagulation behavior, ultrafiltration membrane fouling behavior and the mechanism involved in during the process of pre-oxidation of potassium permanganate and coagulation of aluminum chloride at different condition to treat model pollutants (humic acid, HA) and natural water. The KMnO4 pre-oxidation significantly enhances flocs formation, and for HA artificial water the flocs size increases from 82 to 122 μm at pH 5.5, from 63 to 185 μm at pH 7.0 and from 0 to 75 μm at pH 8.5, respectively, as for natural water it increases from 72 to 139 μm. The enhanced coagulation at pH 5.5 is attributed to the increased polymeric Al speciation after pre-oxidation along with the generated Mn2+ damaging the electric double layer structure. And for pH 8.5 it is mainly caused by the in-situ MnO2 as combination nuclei during pre-oxidation. Besides, for pH 7.0, the combined effect of in-situ MnO2 and the increased polymeric Al speciation both contribute to improvement of the coagulation. What's more, the enhanced Al coagulation by pre-oxidation of KMnO4 also helps alleviate the membrane fouling for both HA artificial water and natural water, and a much rougher surface with larger flocs forms after KMnO4-aided Al coagulation filtration. This study provides an alternative perspective on the mechanism of pre-oxidation coagulation process. © 2023 Elsevier Ltd

关键词： Coagulation

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中国钢铁工业减污降碳协同控制技术发展与展望

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Engineering 2023年第12期31卷 37-49页

作者： Tingyu Zhu Xiaolong Liu Xindong Wang Hong He CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringInnovation Academy for Green ManufactureChinese Academy of SciencesBeijing 100190China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China HBIS Group Co. Ltd.Shijiazhuang 050023China

As the largest steel-producing country,China’s steel industry has experienced rapid development in terms of production level and *** to the high consumption of coal in the iron and steel industry,air pollutants and carbon dioxide(CO_(2))show similar emission properties in flue *** view of the collaborative reduction of pollution and carbon emissions,the emission standards for pollutants and carbon were first analyzed,suggesting that carbon emission standards for the iron and steel industry should be accelerated.A collaborative technology system for the reduction of pollution and carbon emissions from the iron and steel industry in China is demonstrated,consisting of(1)optimization of present ultra-low emission technology,(2)low-carbon innovation for present production processes,(3)steel production process reengineering,and(4)carbon capture,utilization,and storage(CCUS).Finally,the technical prospect for collaborative reduction of pollution and carbon emissions from the iron and steel industry in China is suggested to support high-quality green development in this industry.

关键词： Iron andsteelindustry pollution Carbon emissions Collaborative reduction

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Isotopes unveil overestimation of nutrient-driven oxygen deficit in the tidal rivers of Pearl River Delta during the wet season

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Science of the Total environment 2025年 958卷 178052页

作者： Wen, Jing Huang, Bangjie Huang, Zhiwei Jian, Hongxian Cao, Yingjie Tang, Changyuan Zeng, Fantang Li, Tong Fang, Huaiyang Du, Hongwei The Key Laboratory of Water and Air Pollution Control of Guangdong Province South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510530 China National Key Laboratory of Water Environment Simulation and Pollution Control South China Institute of Environmental Science Ministry of Ecology and Environment Guangzhou510535 China School of Environmental Science and Engineering Sun Yat-Sen University Guangzhou510006 China Department of Horticulture Chiba University Matsudo648 Japan Guangdong Ecological and Environmental Monitoring Center Guangzhou510635 China

A low dissolved oxygen (DO) concentration in summer has been observed in river–estuary systems worldwide. Many studies have caused our stereotype that biochemical oxygen depletion was higher in summer than in winter;however, there was no direct evidence particularly in the tidal river with complex hydrological and biochemical processes. This study employed natural-abundance and labeled isotopes to quantify seasonal apportionment of biochemical oxygen depletion. In this study, apparent oxygen utilization (AOU) and carbon (C) and nitrogen (N) turnover potentials (nitrification rates and δ13C signals) were higher in the wet season than in the dry season. However, calculation results of the nitrification flux demonstrated that actual N turnover was constrained by shorter river residence time in the wet season. Similarly, the δ13C end-member mixing and Rayleigh fractionation models revealed that the conservative C behavior was more pronounced than degradation in situ in the river channel. Overall, C- and N-driven oxygen depletion accounted only for ~8% of AOU in the wet season. This substantiated that the hydrological control regulated C and N behaviors to "the conservative transport" to mitigate O2 depletion in the wet season. In contrast, a good correspondence between C and N turnover and low oxygen was recorded in the dry season. Therefore, the "nutrient- and non-nutrient-constrained DO cold spots" during the dry and wet seasons provided new insights into oxygen deficits in tidal rivers. Our study provided compelling evidence that seasonal apportionment of C- and N-driven oxygen depletion in situ has changed in tidal rivers. Biochemical oxygen depletion was more evident in the dry season than in the wet season;thus, it had been previously overestimated in the wet season, which will provide implications for using different water management strategies in different seasons. © 2024 Elsevier B.V.

关键词： Tidal stream

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Contrasting trends of PM2.5 and surface-ozone concentrations in China from 2013 to 2017

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National Science Review 2020年第8期7卷 1331-1339页

作者： Yonghong Wang Wenkang Gao Shuai Wang Tao Song Zhengyu Gong Dongsheng Ji Lili Wang Zirui Liu Guiqian Tang Yanfeng Huo Shili Tian Jiayun Li Mingge Li Yuan Yang Biwu Chu Tuukka Pet?j? Veli-Matti Kerminen Hong He Jiming Hao Markku Kulmala Yuesi Wang Yuanhang Zhang State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC) Institute of Atmospheric Physics Chinese Academy of Sciences Institute for Atmospheric and Earth System Research University of Helsinki China National Environmental Monitoring Center (CNEMC) Anhui Institute of Meteorological Sciences State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University

Although much attention has been paid to investigating and controlling air pollution in China, the trends of air-pollutant concentrations on a national scale have remained unclear. Here, we quantitatively investigated the variation of air pollutants in China using long-term comprehensive data sets from 2013 to 2017, during which Chinese government made major efforts to reduce anthropogenic emission in polluted regions. Our results show a significant decreasing trend in the PM2.5concentration in heavily polluted regions of eastern China, with an annual decrease of ～7% compared with measurements in 2013. The measured decreased concentrations of SO2, NO2and CO（a proxy for anthropogenic volatile organic compounds） could explain a large fraction of the decreased PM2.5concentrations in different regions. As a consequence, the heavily polluted days decreased significantly in corresponding regions. Concentrations of organic aerosol,nitrate, sulfate, ammonium and chloride measured in urban Beijing revealed a remarkable reduction from 2013 to 2017, connecting the decreases in aerosol precursors with corresponding chemical components closely. However, surface-ozone concentrations showed increasing trends in most urban stations from 2013 to 2017, which indicates stronger photochemical pollution. The boundary-layer height in capital cities of eastern China showed no significant trends over the Beijing–Tianjin–Hebei, Yangtze River Delta and Pearl River Delta regions from 2013 to 2017, which confirmed the reduction in anthropogenic emissions. Our results demonstrated that the Chinese government was successful in the reduction of particulate matter in urban areas from 2013 to 2017, although the ozone concentration has increased significantly, suggesting a more complex mechanism of improving Chinese air quality in the future.

关键词： air pollution clean-air action particulate matter surface ozone China chemical composition

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Graphene-Diyne-Supported Single Transition Metal Atom Catalysts for Co₂ Capture and Co₂ Hydrogenation Conversion

SSRN

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SSRN 2025年

作者： Zhang, Runze Niu, Xiaowei Chen, Zhen Ding, Juan Wang, Chengxin Tang, Yixuan Hou, Yongxia Huang, Jiayi Wang, Yun College of Environment Liaoning Province Pollution Environmental Remediation Technology Innovation Center Liaoning Key Laboratory of Clean Energy and Carron-Neutral Technology Shenyang University Shenyang110044 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Jiaxing Nanhu University School of Mechanical and Electrical Engineering Zhejiang314001 China Shenyang University China

The rising concentration of carbon dioxide (CO₂), a significant greenhouse gas, demands efficient strategies for its capture and conversion into valuable chemicals. Traditional catalysts face challenges like low efficiency and poor selectivity in CO₂ reduction reactions (CO₂RR). This study uses first-principles calculations to explore graphene-diyne (GDY) supported single-atom transition metal catalysts (Ni, Fe, Mo, Ru) for CO₂ capture and hydrogenation. The results show that Ru@GDY demonstrates the highest catalytic activity with strong CO₂ adsorption energy (-0.82 eV) and efficient pathways for producing methane (CH₄) and methanol (CH₃OH). Mo and Fe also exhibit stable structures and significant potential for CO₂ activation. Analysis of bandgap tuning, charge transfer, and reaction intermediates (*HCO, *COH) reveals how metal-carbon bonding enhances catalyst performance. This research advances the understanding of single-atom catalysts and provides insights for designing efficient systems for CO₂ capture and conversion, contributing to sustainable energy solutions © 2025, The Authors. All rights reserved.

关键词： Hydrogenation

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Techno-economic characteristics of wastewater treatment plants retrofitted from the conventional activated sludge process to the membrane bioreactor process

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Frontiers of environmental Science & Engineering 2022年第4期16卷 111-123页

作者： Tingwei Gao Kang Xiao Jiao Zhang Wenchao Xue Chunhai Wei Xiaoping Zhang Shuai Liang Xiaomao Wang Xia Huang College of Resources and Environment University of Chinese Academy of SciencesBeijing 101408China Yanshan Earth Critical Zone and Surface Fluxes Research Station University of Chinese Academy of SciencesBeijing 101408China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Department of Energy Environment and Climate ChangeSchool of EnvironmentResources and DevelopmentAsian Institute of TechnologyKlong LuangPathumthani 12120Thailand School of Civil Engineering Guangzhou UniversityGuangzhou 510006China College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083China Research and Application Center for Membrane Technology School of EnvironmentTsinghua UniversityBeijing 100084China

While a growing number of wastewater treatment plants(WWTPs)are being retrofitted from the conventional activated sludge(CAS)process to the membrane bioreactor(MBR)process,the debate on the techno-economy of MBR *** has continued and calls for a thorough assessment based on techno-economic *** this study,we analyzed the operating data of 20 large-scale WWTPs(capacity≥10000 m^(3)/d)and compared their techno-economy before and after the retrofitting from CAS to *** cost-benefit analysis,we evaluated the net profit by subtracting the operating cost from the environmental benefit(estimated by the shadow price of pollutant removal and water reclamation).After the retrofitting,the removal rate of pollutants increased(e.g.,from 89.0%to 93.3%on average for NH3-N),the average energy consumption increased from 0.40 to 0.57 kWh/m^(3),but the operating cost did not increase *** average marginal environmental benefit increased remarkably(from 0.47 to 0.66 CNY/g for NH3-N removal),leading to an increase in the average net profit from 19.4 to 24.4 CNY/*** further scored the technical efficiencies via data envelopment analysis based on non-radial directional distance *** the retrofitting,the relative cost efficiency increased from 0.70 to 0.73(the theoretical maximum is 1),while the relative energy efficiency did not change *** techno-economy is closely related to the effluent standard adopted,particularly when truncating the extra benefit of pollutant removal beyond the standard in economic *** modeling results suggested that MBR is more profitable than CAS given stricter effluent standards.

关键词： Membrane bioreactor(MBR) Conventional activated sludge(CAS) Cost-benefit analysis Data envelopment analysis Net profit

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