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Low-temperature catalytic degradation of the odorous pollutant hexanal by γ-MnOOH:The effect of Mn vacancies

Chinese Journal of Catalysis 2019年第10期40卷 1525-1533页

作者： Shanhong Sui Pengyi Zhang Huiyu Zhang Ranran Cao State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Beijing Key Laboratory for Indoor Air Quality Evaluation and Control Beijing 100084China

irritation to human *** removal of hexanal has rarely been *** this study,we found that the amount of Mn vacancies inγ-MnOOH significantly affects its catalytic activity toward hexanal degradation and transformation into *** as-synthesized Mn vacancy-richγ-MnOOH exhibited high efficiency toward hexanal removal,achieving 100%degradation of 15 ppm hexanal at 85℃ and complete transformation into CO2 at 160 ℃ under the gas hourly space velocity of 240 L/(g·h);its activity could be completely regenerated by in-situ heat treatment at 180°***,it was found that the degradation of hexanal occurred in a stepwise manner,i.e.,losing one CH2 unit per *** spinning resonance studies detected strong indicative signals for the presence of the superoxide anion radical(?O2^–)on Mn-vacancy-richγ-MnOOH,which may act as active oxygen species for the hexanal *** the role of Mn-vacancy and the mechanism of hexanal degradation byγ-MnOOH are essential for developing efficient oxide catalysts for volatile organic compounds besides hexanal.

关键词： γ-MnOOH Manganese vacancy Hexanal degradation Indoor air Catalysis

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Declining short-term emission control opportunity for major events in Chinese cities

Nature Cities

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Nature Cities 2025年 1-13页

作者： Hanying Wang Yu Zhao Qin He Kai Qin Hao Kong Jintai Lin Bo Zheng State Key Laboratory of Pollution Control and Resource Reuse and School of Environment Nanjing University Nanjing China Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET) Nanjing University of Information Science and Technology Nanjing China School of Environment and Spatial Informatics China University of Mining and Technology Xuzhou China Laboratory for Climate and Ocean-Atmosphere Studies Department of Atmospheric and Oceanic Sciences School of Physics Peking University Beijing China Shenzhen Key Laboratory of Ecological Remediation and Carbon Sequestration Institute of Environment and Ecology Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing China

In China, short-term emission controls have been implemented widely in the host and nearby cities of major events to reduce air pollution. However, insufficient analysis of their effectiveness has weakened the design of pollution controls. In this study, we analyzed the impact of short-term controls on nitrogen oxide emissions and quantified their main drivers in both the host and neighboring cities of 11 events held in east China from 2010 to 2023. We found that short-term controls might be more effective in neighboring cities than in host cities for some events, and that their benefits in terms of reduced emissions have weakened over time. Furthermore, the main sector of emission abatement for events has shifted from power to industry and transportation, reflecting the evolution of emission controls and the relative dominance of air-pollution budgets for different sectors. Our analysis highlights the enhanced targeting of short-term air pollution controls for Chinese cities, which also supports the long-term policy design.

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Advanced Oxidation Barrier Constructed at Gas/Liquid Interface for Volatile Organic Compound Interception in Membrane Distillation

SSRN

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SSRN 2022年

作者： Liu, Hongxin Li, Kuiling Wang, Kunpeng Wang, Zhiyong Liu, Zimou Zhang, Yong Hou, Deyin Zhang, Yu Wang, Jun State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences 18 Shuangqing Road Beijing100085 China National Engineering Laboratory for Industrial Wastewater Treatment Research Center for Eco-Environmental Sciences Chinese Academy of Sciences 18 Shuangqing Road Beijing100085 China University of Chinese Academy of Sciences 19 Yuquan Road Beijing100049 China State Key Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Membrane distillation (MD) is a promising alternative desalination technology, but the hydrophobic membrane has no selective interception effect on volatile organic compounds (VOCs), which results in permeate quality aggravating. In term of this, we proposed a simple method to construct an advanced oxidation barrier at the gas/liquid interface to intercept VOCs through coupling electro-Fenton (EF) and sweeping gas membrane distillation (SGMD). During the so-called EF-MD process, the hydrophobic membrane provided two-way channels for both water vapor transfer and oxygen diffusion. The oxygen was then electro-reduced to H2O2 that reacted with Fe2+ to produce •OH at the membrane surface, which increased the phenol rejection from -8.8% to 90.2%. The electrochemical regeneration of Fe2+ and the robustness to high concentration wastewaters endowed the stability of EF-MD in long-term operation. This study proposed a valuable strategy to intercept VOCs in MD and will broaden the application of MD in hypersaline wastewater treatment. © 2022, The Authors. All rights reserved.

关键词： Oxidation

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Formation Mechanisms and Atmospheric Implications of Summertime Nitrous Acid (HONO) During Clean, Ozone pollution and Double High pollution Periods in Beijing

SSRN

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SSRN 2022年

作者： Xuan, Huiying Zhao, Yaqi Ma, Qingxin Chen, Tianzeng Liu, Jun Wang, Yonghong Liu, Chang Wang, Yafei Liu, Yongchun Mu, Yujing He, Hong State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China College of Resources and Environment University of Chinese Academy of Sciences Beijing100049 China Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China State Key Laboratory of Severe Weather Key Laboratory of Atmospheric Chemistry of China Meteorological Administration Chinese Academy of Meteorological Sciences Beijing100081 China Beijing Institute of Petrochemical Technology Beijing102617 China Aerosol and Haze Laboratory Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing100029 China

Nitrous acid (HONO) is a key precursor of the hydroxyl radicals (OH) and has a significant impact on air quality. Nowadays, the source of HONO is still controversial due to its complex formation mechanisms, which is widely explored in extensive field and laboratory studies. In this study, the pollution characteristics and source contribution of HONO under different air quality conditions in summer in Beijing were analyzed. The observation periods were classified as three typical periods: clean, ozone pollution, and double high pollution (co-occurrence of high PM2.5 and O3 concentrations). The average concentrations of observed HONO were 0.38 ± 0.35 ppb, 0.21 ± 0.18 ppb, 0.26 ± 0.20 ppb and 0.54 ± 0.45 ppb during the whole, clean, ozone and double high periods, respectively. The elevated HONO levels at night were attributed to vehicle emissions and the RH-dependent heterogeneous conversion of NO2 to HONO. The average emission ratio (HONO/NOx) was 0.85 ± 0.38%, and the mean value of calculated nocturnal NO2 to HONO conversion frequency was 0.0076 ± 0.0031 h-1. Based on daytime HONO budget analysis, the largest potential source of HONO was the homogeneous reaction of NO and OH (0.33 and 0.34 ppb h-1), followed by the unknown source (0.11 and 0.21 ppb h-1) during clean and ozone periods, while the unknown source (0.49 ppb h-1) played the predominant role during double high period. The unknown sources of HONO could be attributed to the photo-enhanced heterogeneous conversion of NO2 and the photolysis of particulate nitrate. Furthermore, the photolysis of ozone (0.17, 0.34 and 0.44 ppb h-1) was the major contributor to primary OH during three typical periods. HONO photolysis contributed considerable amounts of primary OH (0.32 ppb h-1) during double high period. These results are helpful to further understand the linkage between HONO and air quality variation. © 2022, The Authors. All rights reserved.

关键词： Ozone

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Accelerating environmental Research to Achieve Sustainable Development Goals

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environmentAL SCIENCE & TECHNOLOGY LETTERS 2023年第11期10卷 961-962页

作者： Mihelcic, James R. Barra, Ricardo O. Brooks, Bryan W. Diamond, Miriam L. Eckelman, Matthew J. Gibson, Jacqueline MacDonald Guidotti, Sunny Ikeda-Araki, Atsuko Kumar, Manish Maiga, Ynoussa McConville, Jennifer Miller, Shelly L. Pizarro, Valeria Rosario-Ortiz, Fernando Wang, Shuxiao Zimmerman, Julie B. Department of Civil & Environmental Engineering University of South Florida 4202 E Fowler Ave ENG 030 Tampa Florida 33620 United States Faculty of Environmental Sciences and EULA Chile Centre University of Concepcion Barrio Universitario s/n Concepción 4070386 Chile Department of Environmental Science Baylor University One Bear Place #97266 Waco Texas 76798-7266 United States Department of Earth Sciences and School of the Environment University of Toronto Toronto M5S 1A1 ON Canada College of Engineering Northeastern University Boston Massachusetts 02115 United States Department of Civil Construction and Environmental Engineering North Carolina State University Fitts-Woolard Hall Room 3253 915 Partners Way Raleigh North Carolina 27695-7908 United States UNICEF Latin America and Caribbean Regional Office Building 102 Alberto Tejada Street City of Knowledge 0843 Republic of Panama Faculty of Health Sciences Hokkaido University Kita 12 Nishi 5 Kitaku Sapporo 060-0812 Japan Sustainability Cluster School of Engineering University of Petroleum & Energy Studies Dehradun Uttarakhand 248007 India Escuela de Ingenieria y Ciencias Tecnologico de Monterrey Campus Monterey Monterrey 64849 Nuevo León Mexico Laboratory of Microbiology and Microbial Biotechnology UFR SVT University Joseph KI-ZERBO 03 BP 7021 Ouagadougou Burkina Faso Department of Energy and Technology Swedish University of Agricultural Sciences Box 7032 Uppsala SE-750 07 Sweden Department of Mechanical Engineering University of Colorado Boulder 427 UCB Boulder Colorado 80309-0427 United States Perry Institute for Marine Science Windsor School (Albany Campus) Frank Watson Boulevard Adelaide The Bahamas Department of Civil Environmental and Architectural Engineering Environmental Engineering Program University of Colorado Boulder Colorado 80309 United States State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084

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Correction to: Perspectives of nervonic acid production by Yarrowia lipolytica

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Biotechnology letters 2022年第7期44卷 901页

作者： Abdulmoseen Segun Giwa Nasir Ali School of Human Settlements and Environment Nanchang Institute of Science and Technology Nanchang 330108 China. State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China. State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China. nasir@***.

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Selective Separation of Volatile Fatty Acids, Nitrogen and Phosphorus from Anaerobic Acidogenic Fermentation Via Forward Osmosis Membrane Process

SSRN

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SSRN 2022年

作者： Zhu, Xian-Zheng Wang, Long-Fei Pan, Xin-Rong Zhang, Feng Huang, Min-Sheng Li, Wen-Wei Liu, Hou-Qi National and Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology Suzhou University of Science and Technology Suzhou215009 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration School of Ecological and Environmental Sciences East China Normal University Shanghai200062 China Suzhou Advanced Research Institute University of Science and Technology of China Suzhou215123 China

Selective separation and recovery of volatile fatty acids (VFA) and other valuable resources promotes a sustainable wastewater treatment system, but its cost-effective separation approaches are poorly understood. This study investigated the feasibility of applying a forward osmosis (FO) dewatering process for the selective separation of VFA, ammonium and phosphate from anaerobic acidogenic fermentation. Limited VFA rejection of fermentation broth, i.e., less than 20%, was observed under acidic conditions, while the rejection rate was significantly increased to ~90% at neutral pH. The transfer of ammonium across the membranes was remarkably impacted by the feed solution pH. Lower pH (~4) values resulted in higher rejection rates of ammonium (~96%), and the rate gradually declined as pH increased. The rejection of phosphate, which remained higher than 98%, was less sensitive to pH variations. The increase in water flux promoted the rejection of VFA, ammonium and phosphate, and the membrane orientation significantly impacted the transfer of nutrients in the FO process. The active layer facing the feed solution (AL-FS) mode exhibited higher rejection rates of VFA, ammonium and phosphate than the active layer facing the draw solution (AL-DS) mode, which was ascribed to the internal concentration polarization effect. Furthermore, approximately 80% of water could be effectively reduced from a real acidogenic fermentation liquor during the FO process;ammonium and phosphate were 3.72-fold and 4.10-fold concentrated in feed solution, respectively, and VFA was selectively separated in draw solution. The work confirmed the feasibility of utilizing FO processes in separating and enriching VFA, ammonium and phosphate from anaerobic fermentation liquors, providing meaningful information on promoting FO-based processes in treating wastewater. © 2022, The Authors. All rights reserved.

关键词： Nutrients

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Correction to "Emission Measurements on a Large Sample of Heavy-Duty Diesel Trucks in China by Using Mobile Plume Chasing"

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environmental science & technology 2023年第45期57卷 17659页

作者： Hui Wang Shaojun Zhang Xiaomeng Wu Yifan Wen Zhenhua Li Ye Wu School of Environment State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing 100084 P. R. China. State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084 P. R. China. Beijing Laboratory of Environmental Frontier Technologies School of Environment Tsinghua University Beijing 100084 China.

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The impact of ultrasonic treatment on activity of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria in activated sludge

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Frontiers of environmental Science & Engineering 2019年第6期13卷 35-43页

作者： Siqi Li Min Zheng Shuang Wu Yu Xue Yanchen Liu Chengwen Wang Xia Huang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Advanced Water Management Centre The University of QueenslandSt.Lucia QLD 4072Australia China Academy of Urban Planning&Design Beijing 100084China

The ultrasonic treatment of sludge has been considered as an effective method to facilitate the partial nitritation of municipal *** study aims to reveal the effects of ultrasound on ammoniaoxidizing bacteria(AOB)and nitrite-oxidizing bacteria(NOB).The impact factors including ultrasonic irradiation time and intensity,sludge concentration,thermal effect and released free radicals were *** maximized difference between the changes in AOB and NOB activities were obtained with 10 g mixed liquor suspended solids(MLSS)/L,using 0.9 kJ/mL ultrasonic energy density and 12 h interval *** increased ultrasonic intensity destroyed the floc structure of activated sludge,increased the microbial death,and decreased the cellular ATP ***,the mechanism exploration indicated that the mechanical shearing could be a critical factor in achieving the nitritation with inhibitory effect on nitrite oxidation.

关键词： Ultrasonic treatment Optimal control Nitrifying bacteria Mechanism analysis

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Exaggerated interaction of biofilm-developed microplastics and contaminants in aquatic environments

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Chemosphere 2023年 345卷 140509页

作者： Ning, Zigong Zhou, Shuang Li, Pengxiang Li, Rong Liu, Feihua Zhao, Zilong Ren, Nanqi Lu, Lu School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen518055 China Zhuhai Modern Agriculture Development Center Zhuhai519075 China Shenzhen Honglue Research Institute of Innovation Management Shenzhen518119 China CCTEG Beijing Academy of Land Renovation and Ecological Restoration Technology Co. Ltd Beijing100013 China Research Center of Land Renovation and Ecological Restoration Engineering in the Coal Industry Beijing100013 China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education School of Environment and Energy South China University of Technology Guangzhou510006 China Sauvage Laboratory for Smart Materials School of Materials Science and Engineering Harbin Institute of Technology Shenzhen518055 China

Biofilm-developed microplastics (MPs) may serve as important vectors for contaminants in aquatic environments. Elucidating the interactions between biofilm-developed MPs and coexisting contaminants is crucial for understanding the vector capacities of MPs. However, little is known about how the adverse effects of contaminants on MP surface-colonized biofilms influence their vector capacity. In this study, we aimed to investigate the interaction mechanism of biofilms colonizing the surface of MPs with coexisting contaminants using microcosm experiments and biofilm characterization techniques. The results indicated that the biofilm biomass on polystyrene increased over time, providing an additional abundance of oxygen-containing functional groups and promoting Cd accumulation by biofilm-developed polystyrene. Moreover, as a coexisting contaminant, Cd exerted adverse effects such as additional mortality of microorganisms and senescence and MP-colonized biofilm shedding. Consequently, the contaminant vector capacity of biofilm-developed MPs could be mitigated. Thus, the adverse effects of coexisting contaminants on biofilms influenced the ability of MPs to act as vectors in aquatic environments. Neglecting the negative effects of contaminants on biofilms may lead to an overestimation of the contaminant vector capacity of biofilm-developed MPs. This study provides support for more accurate assessment of the interactions between biofilm-developed MPs as vectors and contaminants in aquatic environments. © 2023 Elsevier Ltd

关键词： Biofilms

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