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SSRN 2024年

作者： Hu, Qianqian Liang, Yanpeng Zeng, Hong-Hu Huang, Huanfang Chen, Wenwen Qin, Litang Song, Xiaohong Yan, Xiaoyu College of Environmental Science and Engineering Guilin University of Technology Guilin541004 China Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guilin University of Technology Guilin541004 China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510530 China Collaborative Innovation Center for Water Pollution Control and Water Security in Karst Region Guilin University of Technology Guilin541004 China

The Huixian karst wetland, situated in southwest China, is the largest karst wetland. Historically, organochlorine pesticides (OCPs) have negatively affected the aquatic environment and the health of surrounding residents. In this study, the pollution status and environmental fate of OCPs in multiple environmental media in the Huixian wetland were investigated. The 15 OCPs’ total concentration ranges in lake water, ditch water, groundwater, and lake sediment were 46.8–306 ng·L-1, 77.8–251 ng·L-1, 26.0–233 ng·L-1, and 44.8–345 ng·g-1, respectively. The concentrations and proportions of the different OCPs demonstrated significant seasonality. Historical residues are the main source of OCPs in the region, as evidenced by the typical ratios of DDTs to HCHs. Karst regions are extremely vulnerable to environmental change, as evidenced by the highly dynamic character of the karst wetland system and the rapid migration of multimodal OCPs in different media without considerable damage. According to the risk assessment, both the possible carcinogenic risk to sediments in the Huixian wetland and the ecological risk to water bodies were acceptable. In contrast, the consumption of lake water may put the local population at health risk, which is a cause of concern. © 2024, The Authors. All rights reserved.

关键词： Wetlands

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Improvement of Low-Temperature Nh3-Scr Activity Over Cevo4 Modified by Sm

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SSRN 2024年

作者： Li, Yingjie Du, Jinpeng Lin, Chunxi Lin, Jinhan Liu, Jianqi Cai, Jieying Liu, Congwei Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research Station Institute of Urban Environment Chinese Academy of Sciences Ningbo315800 China University of Chinese Academy of Sciences Beijing100049 China College of Engineering Eastern Institute for Advanced Study Ningbo315201 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

In this study, CeSmVO4 catalysts were prepared using the coprecipitation method. The Ce0.8Sm0.2V catalyst exhibited excellent NH3-SCR activity in a wide temperature window range of 175 oC to 375 oC, even under a high GHSV of 200,000 h-1. Analysis using XRD, Raman, and BET techniques revealed that doping Sm into CeVO4 enlarged the surface area and reduced the crystallite size of the catalyst. The H2-TPR and XPS results indicated that the incorporation of Sm improved the redox ability and enhanced the interaction among Ce, Sm, and V. NH3-TPD results demonstrated that the introduction of Sm into CeVO4 resulted in an increase in the number of acid sites. All these factors contributed significantly to the enhancement of low-temperature NH3-SCR reaction activity. Moreover, the addition of Sm could increase the number of Lewis acid sites, enhance the adsorption of NOx species, and promote the formation of -NH2 species and NH4NO3 species, which play a vital role in enhancing the SCR activity. The NH3-SCR reaction on the Ce0.8Sm0.2V catalyst followed both Langmuir-Hinshelwood and Eley-Rideal mechanisms. © 2024, The Authors. All rights reserved.

关键词： Temperature

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A Novel Strategy for Sulfide control in Sewers: Suppressing Sulfide Emission in Sewers by Sulfur Oxidizing Bacteria

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SSRN 2023年

作者： Yuan, Xin Sun, Quanyi Ni, Dong Xie, Zhenwen Zhang, Yanyan Miao, Sun Wu, Linjun Xing, Xin Zuo, Jiane State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Research Institute of Highway Ministry of Transport Beijing100088 China Tsinghua Shenzhen International Graduate School Shenzhen518055 China

Sulfide produced from sewers is considered one of the dominant threats to public health and sewer lifespan due to its toxicity and corrosiveness. In this study, we developed an environmental-friendly strategy for sulfide control by enriching indigenous sulfur-oxidizing bacteria (SOB) from sewer sediment. Ceramics acted as bio-carriers for immobilizing SOB for practical use in a lab-scale sewer reactor. 16S rRNA gene sequences revealed that the SOB consortium was successfully enriched, with Thiobacillus, Pseudomonas, and Alcaligenes occupying a dominant abundance of 64.7% in the microbial community at the genus level. Moreover, metabolic pathway analysis in different acclimatization stages indicates that, after enrichment and immobilization, microorganisms could convert thiosulfate and sulfide into elemental sulfur. A continuous experiment in lab-scale sewer reactors confirmed an efficient result for sulfide suppression with the hydrogen sulfide reduction of 43.9% and 85.1% under high-sulfur load and low-sulfur load conditions respectively. This study shed light on the promising application for sewer sulfide control by biological sulfur oxidation strategy. © 2023, The Authors. All rights reserved.

关键词： Bacteria

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Artificial humic acid produced from wet distillers grains in a microwave-assisted hydrothermal process: Physicochemical characteristics and stimulation to plant growth

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Chemosphere 2024年 364卷 142979页

作者： Lei, Tianlong Su, Jie Chang, Luyi He, Rui Shan, Guangchun Jiang, Xiaomei Lei, Yunhui Guo, Xiaobo Biogas Institute of Ministry of Agriculture and Rural Affairs Chengdu610041 China Research Center for Rural Energy and Ecology Chinese Academy of Agricultural Science Chengdu610041 China Tarim Oilfield Company PetroChina Korla841000 China State Key Laboratory of Environmental Criteria and Risk Assessment and State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental Sciences Beijing100012 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China

Wet distillers grains, as a waste biomass with a large annual output, pose a threat to the environment and food industry. Herein, artificial humic acid (AHA) was first produced from wet distillers grains in a dual-stage microwave-assisted hydrothermal process. The influence of temperature on AHA's characteristics was investigated and compared with natural humic acid (NHA) and standard humic acid (SHA). A high yield of AHA at 20.6% was obtained at 200 °C with a total reaction time of 1 h, which is 1.8–3.1 times that obtained in traditional single-stage hydrothermal process. Increasing the reaction temperature induced the formation of phenolic hydroxyl in AHA. AHA was rich in aromaticity and carboxylic acid structure, showing similar spectral characteristics to NHA. The distribution of molecular weight of AHA was mostly 5797 Da, which decreased by 15% compared to SHA. The optimal concentration of AHA to promote seedling growth was 0.2 g/L, and the root length was 2.0 times that of the control. The microwave hydrothermal process is a facile and efficient approach to preparing AHA from waste biomass with high moisture content. © 2024 Elsevier Ltd

关键词： Microwave heating

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N-Nitrosamines in Karst Groundwaters in Southwestern China: Risks and Implications for Drinking Water Safety

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SSRN 2025年

作者： Gu, Xiongwei Xu, Liwei Huang, Xin Chen, Yingjie Shan, Yuanyu Yan, Xiaoyu Liu, Zhaojue Zeng, Hong-Hu Chen, Wenwen Huang, Huanfang Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guilin University of Technology Guilin541006 China Engineering Research Center of Watershed Protection and Green Development University of Guangxi Guilin University of Technology Guilin541006 China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental Sciences MEE Guangzhou510535 China SCNU Environmental Research Institute Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment South China Normal University Guangzhou510006 China

Groundwater is a vital drinking water source for populations in remote karst regions. However, the highly developed karst tube systems facilitate the infiltration of surface wastewater containing N-nitrosamines, raising concerns about groundwater safety. To assess the safety of groundwater and identify which types are safer for consumption, this study investigated N-nitrosamines in various groundwater types, including ground river, karst cavern, well, and mountain spring waters, in Guangxi, a typical karst region in southwestern China. The total concentrations of eight N-nitrosamines in groundwater ranged from 5.1 to 70.3 ng/L, with N-nitrosodiethylamine (NDEA), N-nitrosodimethylamine (NDMA), and N-nitrosopyrrolidine (NPYR) being the dominant species. Ground river water exhibited significantly higher N-nitrosamine concentrations than karst cavern, well, and mountain spring waters. Significant correlations between N-nitrosamines and dissolved inorganic nitrogen suggested their co-emissions from domestic wastewater and the secondary formation potential of N-nitrosamines in groundwater. Redundancy analysis further identified domestic and swine wastewater as the primary sources. Ground river and mountain spring waters posed the highest risks among the four groundwater types, with 30% and 20% of sites, respectively, exceeding acceptable cancer risk thresholds. These findings underscore the importance of thorough water treatment before groundwater is used for drinking. Strict livestock farming and domestic wastewater discharge regulations are essential to mitigate contamination risks, particularly in karst areas. © 2025, The Authors. All rights reserved.

关键词： Nitrosamines

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Microplastic coupled with soil dissolved organic matter mediated changes in the soil chemical and microbial characteristics

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Chemosphere 2024年 359卷 142361页

作者： Feng, Zhiwang Zhu, Ningyuan Wu, Hanzhou Li, Ming Chen, Jian Yuan, Xuyin Li, Jizhou Wang, Yimin Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education College of Environment Hohai University Nanjing210098 China State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment of China Nanjing210042 China

The abundance of microplastics (MPs) in soil environments has attracted significant attentions, due to their impact on soil physico-chemical properties. However, limited information is available on the influences of MPs on soil carbon composition and microbial utilization characteristics. Therefore, a two-month incubation experiment was conducted to add polyethylene microplastics (PE-MPs) with different levels (1%, 10%) and sizes (150–300 μm and 75–150 μm) into different soils. After that, soil chemical properties including the dissolved organic carbon (DOC), spectral characteristics of dissolved organic matter (DOM) and soil microbial characteristics were analyzed. Results revealed that PE-MPs addition caused significant differences in soil chemical properties between farmland and woodland soils, particularly in soil pH, DOM composition, and soil phosphatase activity. Woodland soil always exhibited higher levels of DOC content, microbial diversity, and soil carbon source utilization compared to farmland soil, leading to increased humification in the DOM of woodland soil. PE-MPs with a larger particle size significantly increased both the soil DOC content and enzyme activity. Addition of PE-MPs altered the soil DOM composition, and the fluorescence parameters like the biological index (BIX) and humification degree. Moreover, the carbon source utilization intensity of microorganisms on PE MPs-contaminated soils is higher in woodland soils. Various analyses confirmed that compared to other soil properties, characteristics of soil DOM had a more significant impact on soil microbial community composition. Thus, PE-MPs in conjunction with soil DOM spectral characteristics regulated soil microbial diversity, which is crucial for understanding soil carbon sequestration. © 2024 Elsevier Ltd

关键词： Microorganisms

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Responses of dissolved organic nitrogen to varied nitrogen deposition: A 16-year nitrogen-addition and cessation experiment in a subtropical forest

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Science of the Total environment 2025年 975卷 179284页

作者： Yang, Dongxing Xie, Dani Mulder, Jan Yu, Qian Huang, Yongmei Duan, Lei State Key Laboratory of Regional Environment and Sustainability School of Environment Tsinghua University Beijing100084 China Shanxi Key Laboratory of Land Consolidation School of Land Engineering Chang'an University Shanxi 710064 China Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life Sciences Box 5003 ÅsNO-1432 Norway State Key Laboratory of Pollution Control and Resource Reuse and School of the Environment Nanjing University 163 Xian in Ave. Jiangsu Nanjing210023 China Faculty of Geographical Science Beijing Normal University Beijing100875 China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Tsinghua University Beijing100084 China

The leaching of dissolved organic nitrogen (DON) signals N loss in forest ecosystems, connecting terrestrial and aquatic ecosystems. The response of DON to varied inorganic N (Nin) deposition remains unclear. A 16-year continuous monitoring of DON in throughfall, soil water, and stream water was conducted under a field N manipulation (10-year Nin addition and subsequent cessation of Nin addition) in a subtropical forest in China. Under reference conditions, the average organic N (Nor) deposition was 23.0 ± 4.9 kg N ha−1 yr−1, with approximately one-third leaching at a soil depth of 30 cm, a value that was higher than those reported for temperate forests. Over a 16-year period, DON concentrations tended to increase in throughfall, soil solutions and stream water. The long-term increase in DON concentrations in soil solutions was primarily driven by increasing Nor deposition and indirectly influenced by decreasing acid deposition. Due to a doubling of monthly Nin input, either as sodium nitrate or as ammonium nitrate, the soil DON leaching doubled, causing the soil to transition from a DON sink to a DON source. After Nin addition ceased, the DON leaching returned to natural levels, and the soil reverted to being a DON sink. This study reveals the importance of Nor deposition and decreasing acid deposition as drivers of long-term trends in DON concentrations in soil solutions, in addition to elucidating the response patterns of DON to increasing and decreasing Nin deposition. © 2025 Elsevier B.V.

关键词： Chronic nitrogen addition Dissolved organic nitrogen Nitrogen deposition Soil acidification recovery Water chemistry

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Biochar-supported nano-scale zerovalent iron activated persulfate for remediation of aromatic hydrocarbon-contaminated soil:an in-situ pilot-scale study

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Biochar 2022年第1期4卷 122-133页

作者： Yu Zeng Tai Li Yingzhi Ding Guodong Fang Xiaolei Wang Bo Ye Liqiang Ge Juan Gao Yujun Wang Dongmei Zhou Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China School of Environmental and Safety Engineering Changzhou UniversityChangzhou 213164China School of Earth and Environment Anhui University of Science and TechnologyHuainan 232001People’s Republic of China Geological Survey of Jiangsu Province Nanjing 210018People’s Republic of China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023People’s Republic of China

Biochar supported nano-scale zerovalent iron(nZVI/BC)for persulfate(PS)activation has been studied extensively for the degradation of pollutants on the lab scale,but it was rarely applied in practical soil remediation in the *** this research,we developed a facile ball-milling method for the mass production of nZVI/BC,which was successfully applied to activate persulfate for the remediation of organic polluted soil on an in-situ pilot ***-situ high-pressure injection device was developed to inject nZVI/BC suspension and PS solution into the soil with a depth of 0-70 *** removal efficiency of target pollutants such as 2-ethylnitrobenzene(ENB,1.47-1.56 mg/kg),biphenyl(BP,0.19-0.21 mg/kg),4-(methylsulfonyl)toluene(MST,0.32-0.43 mg/kg),and 4-phenylphenol(PP,1.70-2.46 mg/kg)at different soil depths was 99.7%,99.1%,99.9%and 99.7%,respectively,after 360 days of *** application of nZVI/BC significantly increased the degradation rates of contaminants by 11-322%,ascribed to its relatively higher efficiency of free radical generation than that of control *** addition,it was found that nZVI/BC-PS inhibited soil urease and sucrase enzyme activities by 1-61%within 55 days due to the oxidative stress for microbes induced by free radicals,while these inhibition effects disappeared with remediation time prolonged(>127 days).Our research provides a useful implementation case of remediation with nZVI/BC-PS activation and verifies its feasibility in practical contaminated soil remediation.

关键词： Persulfate Biochar Nanoscale zerovalent iron Pilot-scale Enzyme activities

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CRITICAL PROCESSES AND MAJOR FACTORS THAT DRIVE NITROGEN TRANSPORT FROM FARMLAND TO SURFACE WATER BODIES

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Frontiers of Agricultural Science and Engineering 2023年第4期10卷 541-552页

作者： Wenchao LI Wen XU Gaofei YIN Xulin ZHANG Zihan ZHANG Bin XI Qiuliang LEI Limei ZHAI Qiang ZHANG Linzhang YANG Hongbin LIU College of Resources and Environmental Sciences State Key Laboratory of North China Crop Improvement and RegulationKey Laboratory for Farmland Eco-Environment of HebeiHebei Agricultural UniversityBaoding 071001China. College of Resources and Environmental Sciences National Academy of Agriculture Green DevelopmentKey Laboratory of Plant-Soil Interactions(Ministry of Education)China Agricultural UniversityBeijing 100193China Rural Energy and Environment Agency Ministry of Agriculture and Rural AffairsBeijing 100125China. Key Laboratory of Nonpoint Pollution Control(Ministry of Agriculture and Rural Affairs) Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China Heze Kingenta Ecological Engineering Co. Ltd.Heze 274000China Key Laboratory of Agro-environment in Downstream of Yangtze Plain(Ministry of Agriculture and Rural Affairs) Jiangsu Academy of Agricultural SciencesNanjing 210014China.

Agricultural non-point source pollution is increasingly an important issue affecting surface water ***,the majority of the studies on nitrogen loss have focused on the agricultural field scale,however,the response of surface water quality at the watershed scale into the nitrogen loss at the field scale is poorly *** present study systematically reviewed the critical processes and major factors that nitrogen transport from farm fields to surface water *** critical processes of farmland nitrogen entering surface water bodies involve the processes of nitrogen transport from farmland to ditches and the transformation processes of nitrogen during migration in ditches/*** transport from farmland to ditches is one of the prerequisites and critical processes for farmland nitrogen transport to surface water *** transformation of nitrogen forms in ditches/rivers is an intermediate process in the migration of nitrogen from farmland to surface water *** loss from farmland is related to soil storage and exogenous ***,nitrogen input management should not only consider the current input,but also the contribution of soil storage due to the historical ***/rivers have a strong retention capacity for nitrogen,which will significantly affect the process of farmland nitrogen entering surface water *** factors affecting nitrogen transformation in river/ditches can be placed in four categories:(1)factors affecting hydraulic retention time,(2)factors affecting contact area,(3)factors affecting biological activity,and(4)forms and amount of nitrogen loading to river/*** systems are more biologically(including plants and microbes)active than rivers with biological factors having a greater influence on nitrogen *** developing pollution prevention and control strategies,ecological ditches can be constructed to increase biological activity and reduce the amount of surplus ni

关键词： nitrogen loss from soil transformation farm field scale watershed scale

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Removal performance,mechanisms,and influencing factors of biochar for air pollutants:a critical review

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Biochar 2022年第1期4卷 678-701页

作者： Zhipeng Zhao Bing Wang Benny K.G.Theng Xinqing Lee Xueyang Zhang Miao Chen Peng Xu College of Resource and Environmental Engineering Guizhou UniversityGuiyang 550025China Key Laboratory of Karst Georesources and Environment Ministry of EducationGuiyang 550025China Manaaki Whenua-Landcare Research Palmerston NorthNew Zealand State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse School of Environmental EngineeringXuzhou University of TechnologyXuzhou 221018China

The emission of air pollutants from various industries is a major contributor to environmental *** removal of these pollutants before they are discharged into the environment has become an important means of controlling air *** has attracted increasing attention because of its low cost,high porosity,large specific surface area,abundant surface functional groups,and high removal *** physicochemical properties of biochar are greatly affected by feedstock types,preparation,and modification *** this reason,the capacity and propensity of biochar for removing air pollutants are rather *** understand the existing research status and grasp the latest research progress,a systematic review on the removal of different air pollutants by biochar is highly *** on the recent research,this paper systematically analyzes and summarizes the preparation and modification methods of biochar commonly used for the removal of six air pollutants(SO_(2),H_(2)S,CO_(2),Hg0,VOCs,and NH_(3)),as well as the removal performance and ***,the potential influencing factors(preparation parameters,physicochemical characteristics of biochar,and removal conditions)are ***,the regeneration of biochar,suggestions,and future perspectives are proposed.

关键词： Biochar Modification Air pollutants Removal performance Removal mechanisms Influencing factors

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