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SSRN 2024年

作者： Xu, Wenxin Cao, Lifeng Ge, Runlei Li, Shupeng Wei, Yunxiao Yang, Yunfeng Li, Guanghe Zhang, Fang State Key Joint Laboratory of Environment Simulation and Pollution Control State Environment Protection Key Laboratory of Microorganism Application and Risk Control School of Environment Tsinghua University Beijing100084 China Beijing100015 China BCEG Environmental Remediation Co. Ltd. Beijing100015 China

Thermal remediation is an effective technology for organic contaminant remediation. However, the application of thermal remediation may have negative effects on soil properties and ecological functions, which requires further investigation. Based on a pilot test of electrical resistance heating remediation (ERH), soil samples were collected at different locations after heating for 116 days. Most soil physicochemical properties except total organic carbon were less affected by the heating temperature difference. Application of high temperature increased microbial abundance but inhibited alpha diversity of the bacterial community. More significant changes in microbial communities were observed at temperatures above 60°C. The genera mainly affected by heating temperature included Flavobacteria, Brockia, and S085, while the increase in temperature also inhibited the abundance of nitrochlorobenzene functional genes. At 140 days after the end of the pilot test, the bacterial community affected by thermal remediation could recover effectively, and the recovery of the bacterial community was not affected by temperature difference during the heating period. This study provides valuable field evidence of the long term impact of soil ERH treatment on soil properties and microbial communities, and provide further references for optimization of remediation performance with coupled technologies. © 2024, The Authors. All rights reserved.

关键词： Soils

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Development of seasonal ozone maximum reactivity scales for Beijing, China

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Science of the Total environment 2024年 957卷 177563页

作者： Zhou, Houhua Liu, Yanhui Tan, Zhaofeng Chen, Shiyi Zeng, Liming Li, Xin Lu, Keding State Key Joint Laboratory of Environment Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing100871 China Environmental Analysis and Testing Laboratory Chinese Research Academy of Environmental Sciences Beijing100012 China

We designed scenarios based on urban emissions to develop a Maximum Incremental Reactivity (MIR) scale for 41 conventional volatile organic compounds (VOCs) in Beijing and quantitatively analyzed the various factors affecting MIR in urban areas. We explored the effects of updating the representative urban atmosphere used for ozone reactivity calculations by incorporating updated meteorological data, emission rates, initial condition concentrations, and VOC profile compositions. A box model equipped with the Master Chemical Mechanism (MCM) was used to localize the MIR scale for Beijing based on urban emission model inputs, and this was compared with scenarios in the United states. The MIR differences for most VOC species were minimal;however, Beijing exhibited higher MIR values for aromatic hydrocarbons in the summer, attributed to the higher emission intensity of aromatics in the city. Due to differences in meteorological conditions and emission scenarios, the MIR showed significant seasonal characteristics across different months. It is necessary to calculate independent MIR scales for different urban agglomerations under specific ozone pollution seasons and emission conditions. This study provides recommendations for the application of the MIR scale and can serve as a reference for VOC control strategies in China and other countries facing ozone pollution. © 2024

关键词： Beijing Maximum Incremental Reactivity (MIR) Seasonal VOCs

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Insight into the Deterioration Mechanism of Gas Diffusion Electrode During Long-Term Electrosynthesis of Hydrogen Peroxide Under Industrially Relevant Current Densities

SSRN

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SSRN 2024年

作者： Zhao, Erzhuo Wang, Shiyi Yu, Gang Wang, Yujue School of Environment Beijing Key Laboratory for Emerging Organic Contaminants Control State Key Joint Laboratory of Environmental Simulation and Pollution Control Tsinghua University Beijing100084 China Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal University Zhuhai519087 China

The long-term stability of gas diffusion electrodes (GDEs) is critical for industrial H2O2 electrosynthesis from two-electron oxygen reduction reaction (2e-ORR), but has rarely been investigated. Herein, we evaluated the stability of carbon black-polytetrafluoroethylene (CB-PTFE) based GDEs during H2O2 electrosynthesis in sodium sulfate (Na2SO4) electrolytes under industrially relevant conditions. Results show that the GDEs maintained stable H2O2 production with Faradaic efficiencies (FEs) of ~75% for ~300 h under 150 mA/cm2. However, FEs then declined gradually to eventually ~15% at 840 h, after which the GDE failed due to water flooding. Increasing applied current density to 200 mA/cm2 accelerated the deterioration process and caused electrode failure after 350 h operation. Characterizations of the GDEs used for varying durations indicate that the deterioration of GDEs is mainly caused by oxidation of CB catalysts, defluorination of PTFE, and intercalation of Na in CB particles during H2O2 electrosynthesis. These three interrelating mechanisms gradually decreased the hydrophobicity, the 2e-ORR activity and selectivity of GDEs, and increased the porosity of GDEs. These changes in turn promoted H2O2 decomposition and progressive water intrusion into the internal pores of GDEs during H2O2 electrosynthesis, thus causing the gradual decreases of FEs and electrode flooding. Due to the gradual changes of GDE properties, it is challenging to maintain long-term stable H2O2 production under industrially relevant current densities. More studies are needed to improve the design and operation of GDEs to resolve the deterioration process of GDEs and thus extend their lifetime during H2O2 electrosynthesis. © 2024, The Authors. All rights reserved.

关键词： Sodium sulfate

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Repercussions of COVID-19 pandemic on solid waste generation and management strategies

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Frontiers of environmental Science & Engineering 2021年第6期15卷 241-258页

作者： Yangyang Liang Qingbin Song Naiqi Wu Jinhui Li Yuan Zhong Wenlei Zeng Macao Institute of Systems Engineering Macao University of Science and TechnologyMacao 999078China Macao Environmental Research Institute Macao University of Science and TechnologyMacao 999078China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

It has been over ten months since the beginning of the 2019 coronavirus disease(COVID-2019),and its impact on solid waste management,especially medical waste,is becoming *** study systematically reviews the potential influences of the COVID-19 pandemic on medical waste,personal protection equipment waste and municipal solid waste(MSW),and discusses the corresponding measures and policies of solid waste management in typical *** results show that the generation of medical waste from the pandemic increased significantly,with 18%‒425%*** is estimated that the daily output of COVID-19 medical waste increased from 200 t/d on Feb.22 to over 29000 t/d at the end of September 2020 throughout the *** use of personal protective equipment will continue to grow in the long-term,while the blockade and isolation measures greatly reduced the volume of commercial waste,especially for tourist cities,and part of this waste was transferred to household ***’attitudes and behavior toward food waste have changed due to the COVID-19 *** response to the pandemic,international organizations and several countries have issued new policies and guidelines and adjusted their management strategies for medical waste and MSW *** pandemic has brought specific challenges to the disposal capacity of medical waste *** has also brought about the stagnation of policies related to the reduction of plastic products and waste *** study will provide some useful information for managers and governmental officials on effective solid waste management during and after the COVID-19 pandemic.

关键词： COVID-19 Medical waste Personal protective equipment Municipal solid waste Waste management

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Modified red soil combined with aquatic plants to control sediment phosphorus release

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Zhongguo Huanjing Kexue/China environmental Science 2025年第5期45卷 2780-2791页

作者： Zou, Lin-Xi Li, Dan-Li Cheng, Kang-Long Zhang, Yu Zhang, Wen College of Ecology and Environment Chengdu University of Technology Chengdu610059 China Key Laboratory of Collaborative Control and Joint Remediation of Soil and Water Pollution in National Environmental Protection Chengdu610059 China State Key Laboratory of Geological Disaster Prevention and Geological Environment Protection Chengdu610059 China

This study utilized natural red clay (RC) and 700°C calcined red clay (CRC-700) to form treatment groups combined with submerged macrophytes Vallisneria spiralis (VS) and Ceratophyllum demersum (CD), aiming to develop a treatment technology effective in controlling sedimentary phosphorus (P) release. The results demonstrated that the VS+CRC-700 treatment group exhibited superior performance in reducing and removing sedimentary P compared to other treatments. Specifically, dissolved reactive phosphorus (SRP) in the overlying water of the VS+CRC-700 group was significantly reduced from 1.38 mg/L to 0.024 mg/L compared to the control group. Additionally, the concentrations of Fe(II)-P and iron-aluminum bound phosphorus (CDB-P) in different sediment layers were maximally decreased by 94 and 488.03 mg/kg, respectively. Meanwhile, the VS+CRC-700 treatment markedly enhanced P immobilization in sediments, with Ca-P content increasing by up to 182.78mg/kg across sediment layers. Furthermore, microbial community analysis revealed that VS+CRC-700 increased sediment microbial abundance by 5403 units, while reducing the relative abundances of Proteobacteria and Bacteroidetes by 16.56% and 33.33%, respectively. These findings collectively suggest that VS+CRC-700 represents a cost-effective and high-efficiency technology for improving water quality in P-polluted systems. Its application demonstrates significant potential in controlling sedimentary P release under weak hydrodynamic conditions. © 2025 Chinese Society for environmental Sciences. All rights reserved.

关键词： River pollution

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Daytime Ozone Production Determined by Ratios of Total Volatile Organic Compound Consumption to Nitrogen Oxide Concentrations

ACS ES&T Air

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ACS ES&T Air 2025年第3期2卷 331-342页

作者： Xudong Zheng Qinwen Tan Jie Ren Bin Luo Danlin Song Miao Feng Hefan Liu Yue Qin Yufang Hao Liming Zeng Xin Li Sihua Lu Huabin Dong Shaodong Xie College of Environmental Sciences and Engineering State Key Joint Laboratory of Environmental Simulation and Pollution Control Peking University Beijing 100871 China Chengdu Academy of Environmental Sciences Chengdu Sichuan 610072 China Sichuan Academy of Environmental Policy and Planning Chengdu Sichuan 610041 China College of Environmental Sciences and Engineering State Key Joint Laboratory of Environmental Simulation and Pollution Control Peking University Beijing 100871 China；Laboratory of Atmospheric Chemistry Energy and Environment Research Division Paul Scherrer Institute Villigen 5232 Switzerland

To reduce the uncertainty in analyzing ozone (O3) sensitivities based on observed concentrations of volatile organic compounds (VOCs) and nitrogen dioxide, this study proposed the application of consumed VOC concentrations to establish their nonlinear relationship in the actual atmosphere. These parameters were calculated based on the reaction rates and online observations of VOCs, nitrogen dioxide, and O3concentrations at Deyang, Chengdu, and Meishan in the Chengdu Plain, China, during summer 2019. The nighttime isoprene consumption was maximum at 2.03 ppbv at Meishan. The daytime acetaldehyde consumption was a maximum at 2.68 ppbv at Deyang, possibly due to its higher primary emissions and secondary production and its consumption by both OH radicals and photolysis. When the ratios of the total consumed VOC concentrations to the observed or initial NOx(NOx= NO + NO2) concentrations were 3.51 ppbv ppbv–1or 2.22 ppbv ppbv–1, daytime O3variations reached a maximum of 8.45 ppbv or 7.52 ppbv, respectively. The ratios delineated the VOC-sensitive and NOx-sensitive areas. Over 98% of hourly data were in VOC-sensitive areas at both Chengdu and Meishan, respectively, while over 14% of hourly data belonged to NOx-sensitive areas at Deyang. This provided a more accurate method for assessing real-time O3sensitivity and thus implementing dynamic hierarchical control strategies.

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Self-Dispersed Fe Single-Atom on Biochar Derived from Zn-Hyperaccumulator Residues for Selective Peroxymonosulfate Activation Via Electron Transfer Process

SSRN

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SSRN 2023年

作者： Li, Fangzhou Wan, Ziren Zheng, Di Zhang, Lina Huang, Wan Chen, Fei Deng, Jia Qi, Zhen Li, Guanghe Zhang, Fang School of Environment Tsinghua University Beijing100084 China State Key Joint Laboratory of Environment Simulation and Pollution Control Beijing100084 China Beijing100015 China

Herein, "self-dispersion" Fe single-atom anchored biochar (FeSA-BC) was facilely synthesized by endogenous strategy using Zn-hyperaccumulator residues (Sedum alfredii). Evaporation of hyper-enriched Zn during high temperature pyrolysis facilitated the formation of defect trapping sites and promoted the atomically-dispersion of intrinsic Fe. FeSA-BC exhibited an impressive mass activity of 3.13×104 min-1 mol-1, and performed stable Bisphenol A (BPA) removal efficiency with high catalytic ability over a wide pH range and in the presence of groundwater interferences, including inorganic anions and natural organic matter. FeSA-BC/peroxymonosulfate (PMS) system enabled the potential difference-driven selective oxidation of electron-rich phenolic pollutants with relatively low ionization potential (IP) via nonradical process (EIP, © 2023, The Authors. All rights reserved.

关键词： Ionization potential

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Improving anaerobic digestion performance after severe acidification: Unveiling the impacts of Fe3O4-bentonite composites in co-digestion of waste activated sludge and food waste

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Bioresource Technology 2024年 402卷 130775页

作者： Zhu, Ruilin Chen, Yongdong Huang, Yangrui Tang, Zhenzhen Li, Huaizheng Gu, Li State Key Laboratory of Pollution Control and Resources Reuse School of Environmental Science and Engineering Tongji University 1239 Siping Road Shanghai200092 China Key Laboratory of the Three Gorges Reservoir Region's Eco-environments Ministry of Education College of Environment and Ecology Chongqing University 174 Shapingba Road Chongqing400045 China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Acidification recovery in anaerobic digestion of food waste is challenging. This study explored its in-situ recovery using a co-substrate of food waste and waste activated sludge. Fe3O4 and bentonite were used as conductor and carrier, respectively, to enhance AD performance under severe acidification. The application of Fe3O4-bentonite resulted in a 152% increase in cumulative methane in the Fe3O4-bentonite 10 digester, demonstrating its effectiveness in restoring the acidified AD system. In acidified systems, bentonite enhanced the diversity and richness of microbial communities due to its buffering capacity. The excessive non-conductive polysaccharides excreted by bacteria in extracellular polymeric substances reduced the possibility of electron transfer by Fe3O4. However, in the synergistic application of Fe3O4 and bentonite, this resistance was alleviated, increasing the possibility of direct interspecies electron transfer, and accelerating the consumption of volatile fatty acids. This approach of integrating carrier and conductive materials is significant for in-situ restoration of acidified systems. © 2024 Elsevier Ltd

关键词： Magnetite

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Surface-enhanced Raman scattering for mixing state characterization of individual fine particles during a haze episode in Beijing,China

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Journal of environmental Sciences 2021年第6期33卷 216-224页

作者： Hui Chen Fengkui Duan Jingjing Du Ranhao Yin Lidan Zhu Jinlu Dong Kebin He Zhenli Sun Suhua Wang MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Guangdong Provincial Key Laboratory of Petrochemcial Pollution Processes and Control School of Environmental Science and EngineeringGuangdong University of Petrochemical TechnologyMaoming 525000China

The nondestructive characterization of the mixing state of individual fine particles using the traditional single particle analysis technique remains a *** this study,fine particles were collected during haze events under different pollution levels from September 5 to 112017 in Beijing,China.A nondestructive surface-enhanced Raman scattering(SERS)technique was employed to investigate the morphology,chemical composition,and mixing state of the multiple components in the individual fine *** image and SERS spectral analysis results show that soot existing in the form of opaque material was predominant during clear periods(PM_(2.5)≤75μg/m^(3)).During polluted periods(PM_(2.5)>75μg/m^(3)),opaque particles mixed with transparent particles(nitrates and sulfates)were generally *** classical least squares analysis further identified the relative abundances of the three major components of the single particles:soot(69.18%),nitrates(28.71%),and sulfates(2.11%).A negative correlation was observed between the abundance of soot and the mass concentration of PM_(2.5).Furthermore,mapping analysis revealed that on hazy days,PM_(2.5)existed as a core-shell structure with soot surrounded by nitrates and *** mixing state analysis method for individual PM_(2.5)particles provides information regarding chemical composition and haze formation mechanisms,and has the potential to facilitate the formulation of haze prevention and control policies.

关键词： PM_(2.5) Surface-enhanced Raman scattering Individual fine particle Nitrate Sulfate Soot

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Electrocatalytic oxidation of gaseous toluene in an all-solid cell using a foam Ti/Sb-SnO2/β-PbO_(2) anode

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Journal of environmental Sciences 2023年第12期134卷 77-85页

作者： Zhikun Liu Weiming Qian Min Chen Wenshuo Zhou Boying Song Bo Zhang Xiaolei Bao Qiong Tang Yongchun Liu Changbin Zhang Aerosol and Haze Laboratory Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Hebei Technological Innovation Center for Volatile Organic Compounds Detection and Treatment in Chemical Industry Department of quality inspection and managementHebei Chemical and Pharmaceutical CollegeShijiazhuang 050026China College of Energy materials and Chemicals Leshan Normal UniversityLeshan 614000China

Mineralization of benzene,toluene,and xylene (BTX) with high efficiency at room temperature is still a challenge for the purification of indoor *** this work,a foam Ti/Sb-Sn O2/β-Pb O_(2)anode catalyst was prepared for electrocatalytically oxidizing gaseous toluene in an all-solid cell at ambient *** complex Ti/Sb-Sn O_(2)/β-Pb O_(2)anode,which was prepared by sequentially deposing Sb-Sn O_(2)and β-Pb O_(2)on a foam Ti substrate,shows high electrocatalytic oxidation efficiency of toluene (80%) at 7 hr of reaction and high CO_(2)selectivity (94.9%) under an optimized condition,i.e.,a cell voltage of 2.0 V,relative humidity of60%and a flow rate of 100 m L/*** better catalytic performance can be ascribed to the high production rate of·OH radicals from discharging adsorbed water and the inhibition of oxygen evolution on the surface of foam Ti/Sb-Sn O_(2)/β-Pb O_(2)anode when compared with the foam Ti/Sb-Sn O_(2)*** results demonstrate that prepared complex electrodes can be potentially used for electrocatalytic removal of gaseous toluene at room temperature with a good performance.

关键词： Gaseous toluene Electrocatalytic oxidation Lead dioxide Indoor air purification Solid cell

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