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Evaluation of Best Management Practices for Mitigating Harmful Algal Blooms Risk in an Agricultural Lake Basin Using a Watershed Model Integrated with Bayesian Network Approach

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SSRN 2024年

作者： Liu, Dingwu Huang, Lei Jia, Ling Wang, Peng Faculty of Civil Engineering and Mechanics Jiangsu University Zhenjiang212013 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Lake eutrophication caused by nitrogen and phosphorus has led to frequent harmful algal blooms (HABs), especially under the unknown challenges of climate change, which have seriously damaged human life and property. In this study, a Bayesian Network (BN)-SWAT+ model framework was constructed to elucidate the mechanisms between non-point source nitrogen pollution in agricultural lake watersheds and algal activities. A typical agricultural shallow lake basin, the Taihu Basin (TB), China, was chosen in this study, aiming to investigate the effectiveness of best management practices (BMPs) in controlling HABs risks in TB. By modeling total nitrogen concentration of Taihu Lake from 2007-2022 with four BMPs (filter strips, grassed waterway, fertilizer application reduction and no-till agriculture), the results indicated that fertilizer application reduction proved to be the most effective BMP with 0.107 of Harmful Algal Blooms Probability Reduction (HABs-PR) when reducing 40% of fertilizer, followed by filter strips with 0.01 of HABs-PR when 4815ha of filter strips were conducted, while grassed waterway and no-till agriculture showed no significant effect on preventing HABs. Furthermore, the combined practice between 40% fertilizer application reduction and 4815ha filter strips construction showed synergistic effects with HABs-PR increasing to 0.140. Precipitation and temperature data were distorted to model scenarios of extreme events. As a result, the combined approach outperformed any single BMP in terms of robustness under extreme climates. This research provides a watershed-level perspective on HABs risks mitigation and highlights the strategies to address HABs under the influence of climate change. © 2024, The Authors. All rights reserved.

关键词： Climate change

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Insights into the Role of Vocs Properties on Desorption Behaviors of Two Porous Polymeric Resins

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SSRN 2023年

作者： Liu, Huijuan Yu, Yansong Yang, Zemin Liu, Zhimin Long, Chao School of Eco-Environment Hebei University Baoding071002 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Desorption is a critical process in the recovery or post-treatment of adsorbents saturated with volatile organic compounds (VOCs). In this study, the thermal desorption behaviors for eight VOCs on hypercrosslinked polymeric resin (HPR) and macroporous polymeric resin (MPR) were investigated through isothermal desorption and temperature programmed desorption (TPD). Compared with MPR, HPR with more micropores exhibited a lower desorption rate constant, lower desorption efficiency and higher desorption activation energy due to the strong binding energy generated between VOCs molecules and narrow micropores. As the polarizability of VOCs increased, the desorption rate constants on two porous polymeric resins decreased, while the desorption activation energy showed an incremental trend. Excellent linear correlations were observed between VOC polarizability and desorption rate constants (R2=0.957 for HPR and R2=0.940 for MPR) as well as between VOC polarizability and desorption activation energy (R2=0.981 for HPR and R2=0.969 for MPR). Furthermore, a polyparameter linear free energy relationship (PP-LFER) was developed to explore the influences of intermolecular interactions on desorption behaviors of VOCs on porous polymeric resins. The results indicated that the dispersive interaction, which is directly related to polarizability of VOCs, was the primary factor influencing the desorption activation energy of VOCs on porous polymeric resins. The find from this study helps evaluate fleetly and availably the desorption properties of VOCs based on their polarizability. © 2023, The Authors. All rights reserved.

关键词： Volatile organic compounds

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Enhanced Ozonation of Nitrobenzene in Water Using Natural Iron Ores: Efficiencies, Mechanisms and Stability

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SSRN 2024年

作者： Hu, Jingze Wang, Qingji Wang, Yuxian Wang, Qinghong Li, Zhuoyu Chen, Chunmao CNPC Research Institute of Safety and Environment Technology Beijing102206 China State Key Laboratory of Heavy Oil Processing Beijing Key Laboratory of Oil and Gas Pollution Control China University of Petroleum-Beijing Beijing102249 China

Natural minerals show potential for catalytic ozonation in industrial wastewater treatment. In this study, the efficiencies and mechanisms of two natural iron ores in catalytic ozonation process (COP) for aqueous nitrobenzene degradation were initially investigated. Compared with single O3, the removal of TOC increased by about 60% and 35% in COP with natural magnetite and pyrite, respectively. Both natural magnetite and pyrite could promote O3 decomposition to form hydroxyl radicals and 1O2. But the inner reaction pathways were different. The natural magnetite facilitated O3 decomposition through the Lewis acids and the electron transfer between Fe2+/Fe3+ on the catalyst surface, while electron transfer was the only pathway for O3 decomposition by natural pyrite. Continuous flow fixed-bed reactor was adopted to provide better simulation of the practical operation conditions, so that the potential of engineering application could be evaluated. The natural magnetite exhibited excellent catalytic activity and stability during long period continuous operation in fixed-bed reactor. The removal of TOC maintained at 81.9% under the optimized operating parameters of hydraulic retention time (2.84 h), O3 velocity (0.25 L min-1) and O3 concentration (30 mg L-1). HCO3- and PO43- obviously inhibited the removal of TOC through radical scavenging and surface -OH occupying. While low concentration of Cl- and SO42- showed negligible effect on the mineralization of aqueous nitrobenzene. After a long period operation for 672 h, the TOC removal of nitrobenzene solution in the magnetite-COP system was still stable at about 80%. The present study demonstrated the engineering application prospect of the natural iron ores in COP treatment of recalcitrant chemical wastewaters. © 2024, The Authors. All rights reserved.

关键词： Efficiency

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A Stochastic Exposure Model Integrating Random Forest and Agent-Based Approaches: Evaluation for Pm2.5 in Jiangsu, China

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SSRN 2022年

作者： Zhou, Qi Wang, Xin Shu, Ye Sun, Li Jin, Zhou Ma, Zongwei Liu, Miaomiao Bi, Jun Kinney, Patrick L. State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing China Department of Environmental Health School of Public Health Boston University BostonMA United States

This research proposes an Activity Pattern embedded Air pollution Exposure Model (AP2EM), based on survey data of when, where, and how people spend their time and indoor/outdoor ratios for microenvironments. AP2EM integrates random forest and agent-based approaches to simulate the stochastic exposure to outdoor fine particulate matter (PM2.5) along with indoor and in-vehicle PM2.5 of outdoor origin. The R2 of the linear regression between the model's calculations and personal measurement was 0.65, which was more accurate than the commonly-used aggregated exposure (AE) model and the outdoor exposure (OE) model. The population-weighted PM2.5 exposure estimated by the AP2EM was 36.7 μg/m3 in Jiangsu, China, during 2014-2017. The OE model overestimated exposure by 54.0%, and the AE model underestimated exposure by 6.5%. These misestimate reflect ignorance of traditional studies on effects posed from time spent indoors (~85%) and doing low respiratory rate activities (~93%), problems of biased sampling, and neglecting low probability events. The proposed AP2EM treats activity patterns of individuals as chains and uses stochastic estimates to model activity choices, providing a more comprehensive understanding of human activity and exposure characteristics. Overall, the AP2EM is applicable for other air pollutants in different regions and benefits China's air pollution control policy designs. © 2022, The Authors. All rights reserved.

关键词： Stochastic systems

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Phosphorus transformation under the influence of aluminum,organic carbon,and dissolved oxygen at the water-sediment interface:A simulative study

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Frontiers of environmental Science & Engineering 2020年第3期14卷 165-176页

作者： Ouchen Cai Yuanxiao Xiong Haijun Yang Jinyong Liu Hui Wang State Key Joint Laboratory on Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084 Beijing 101 Middle School Beijing 100091China Department of Chemistry Tsinghua UniversityBeijing 100084China

The effects of sediment aluminum(Al),organic carbon(OC),and dissolved oxygen(DO)on phosphorus(P)transformation,at the water-sediment interface of a eutrophic constructed lake,were investigated via a series of simulative *** above three factors had various influences on dissolved P concentration,water pH,water and surface sediment appearance,and P *** of Al had the greatest effect on suppressing P release,and the water p H remained alkaline in the water-sediment system under various OC and DO *** dissolution of the added Al was detected.31P-N M R characterization suggested that OC addition did not promote biological P uptake to polyphosphates under oxic *** simulation result on the added phytate indicated the absence of phytate in the original lake *** compared to the reported natural lakes and wetland,the water-sediment system of the constructed lake responded differently to some simulative *** Al,OC,and DO can be controlled with engineering methods,the results of this study provide insights for the practical site restorations.

关键词： Phosphorus Sediment simulation Dissolved oxygen Organic carbon Aluminum

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Nitrate formation in anammox process: Mechanisms and operating conditions

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Heliyon 2024年第21期10卷 e39438页

作者： Yu, Heng Dong, Yue Wang, Sike Jia, Weiyi Wang, Yating Zuo, Jiane Qu, Chengtun State Key Laboratory of Petroleum Pollution Control Xi'an Shiyou University Xi'an China Shaanxi Province Key Laboratory of Environmental Pollution Control and Reservoir Protection Technology of Oilfields Xi'an Shiyou University Xi'an China Department of Material and Environmental Engineering Shenzhen Polytechnic Shenzhen China School of Chemistry and Chemical Engineering Xi'an Shiyou University Xi'an China Tsinghua Shenzhen International Graduate School Shenzhen China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing China

Anaerobic ammonium oxidation (anammox) is an energy-efficient technology for wastewater nitrogen removal. However, the byproduct nitrate has hindered development and application of anammox process. Meanwhile, the knowledge of nitrate formation during anammox process is insufficient, which prohibits high nitrogen removal. This review firstly summaries and discusses valuable findings on nitrate formation, including molecular mechanism of nitrate production, microbial pathway of nitrate reduction and its net formation. Specially, influences of operating conditions on mechanisms and patterns of nitrate formation are analyzed. Then, based on nitrate formation mechanism, current strategies of nitrate removal from anammox process are reevaluated. Finally, the key knowledge gaps and further process development are presented. Overall, this review sheds light on the understanding of nitrate formation of anammox process, which would further facilitate and optimize the process design and operation for high performance nitrogen removal. © 2024 The Authors

关键词： Anammox Biological nitrogen removal Nitrate formation Operating conditions Synergic effect

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Multifaceted Effects of Ultrasonic Enhanced Fe-C/Pds System for Sludge Dewatering and Resource Utilization: Synergy of Oxidation and Cracking Processes

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SSRN 2024年

作者： Li, Wenye Xie, Binghan Li, Qinghao Li, Zhipeng Zhu, Jing You, Hong Zhang, Guoyu Li, Weirun Xing, Xiaodi Zeng, Fanbo Li, Lingjie Zhao, Shuyu Shang, Zhiwei Wang, Shuxiao Harbin Institute of Technology Weihai Sch Marine Sci & Technol Weihai264209 China Harbin Inst Technol Sch Environm State Key Lab Urban Water Resource & Environm Harbin150090 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

The effective dewatering of waste activated sludge (WAS) and the utilization of resources are crucial for the sustainable development of wastewater treatment plants. In this study, ultrasonic (US) collaborative Fe-C activated peroxydisulfate (PDS) coupling system was constructed to investigate the shift in physicochemical properties and explore the mechanisms during the cracking and oxidation of WAS. The US enhanced Fe-C/PDS system exhibited excellent oxidation capacity with the water content (Wc) of sludge cake and the specific resistance to filtration (SRF) reducing to 61.71% and 1.12×1012 m/kg under the conditions of PDS, Fe-C, and US power levels at 120 mg/g TS, 300mg/g TS, and 150W. Furthermore, the high cracking capacity led to a rise in soluble chemical oxygen demand to 630.64 mg/L and a 9.16% reduction in volatile solids. Compared to Fe-C/PDS, the addition of US enhanced the leaching of Fe, promoted to the formation of reactive oxidative species. The contribution of ·O2-and 1O2 to sludge conditioning was 37% and 43.17%, indicating the oxidation process of free radicals and non-free radicals in Fe-C/PDS/US system. Additionally, US improved the cracking capacity of the system, releasing bound extracellular polymeric substances (EPS) and degrading into soluble properties. The concentration of short-chain fatty acids (SCFAs) in the sludge was increased by 96.7%, which significantly improved the quality of carbon source suitable for recycling. The positive improvement of sludge physicochemical properties revealed the decryption-degradation synergistic effect of the coupled systems. These findings provide a novel strategy for effective disposal and reduction in WAS while also offering valuable insights into resource utilization. © 2024, The Authors. All rights reserved.

关键词： Dewatering

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Janus Photoelectrocatalytic Filter for Sustainable Water Decontamination

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SSRN 2023年

作者： Jin, Limin Sun, Meng Yang, Jianping Huang, Yingping Liu, Yanbiao College of Environmental Science and Engineering Textile Pollution Controlling Engineering Center The Ministry of Ecology and Environment Donghua University Shanghai201620 China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai201620 China Yichang443002 China Shanghai Institute of Pollution Control and Ecological Security 1239 Siping Road Shanghai200092 China

Herein, we conceive a Janus photoelectrocatalytic filter (Sb-Fe/MXene) by depositing Sb single-atoms (Sb-SA) and Fe nanoclusters (Fe-NC) decorated MXene mixture on either side of Ni-foam substrate, respectively, which realized sustainable and efficient generation of hydrogen peroxide (H2O2) and hydroxy radical (•OH) without any chemical input. Photocatalytic-side ensures that the accumulated holes at Ti vacancies neighboring the Sb-SA promote the 4e− water oxidation reactions to produce O2, while the Sb-SA sites collect electrons forming reducing centers for non-sacrificial H2O2 production via the 2e− oxygen reduction reaction. Electrocatalytic-side guarantees the circulation of ≡Fe(III)/≡Fe(II) by continuously exposing"fresh" reactive sites by dissociating H2O2 on the ≡Fe(II). This further prohibits iron sludge accumulation with an enhanced remedy of micropollutants, even under neutral conditions for wastewater. The collaborative effect between photochemistry and electrochemistry establishes a strategy for energy conversion and environmental remediation using a Janus photoelectrocatalytic filtration system. © 2023, The Authors. All rights reserved.

关键词： Hydrogen peroxide

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Driving Factors of Aerosol Ph Changes in Four Cities in Northern China During the 2022 Winter Olympics

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SSRN 2024年

作者： Zhu, Hongji Zhang, Xiang Liu, Yafei Chen, Jing Liu, Lianyou Hou, Dongli Liu, Xingang Yang, Yuanle Jiang, Jiongjiong State Key Joint Laboratory of Environmental Simulation & Pollution Control School of Environment Beijing Normal University Beijing100875 China Ecology Environment Monitoring Center of Hebei Province Shijiazhuang050000 China Jining Ecological Environment Affairs Center Jining272000 China Jining Ecological Environment Monitoring Center Jining272100 China Key Laboratory of Environmental Change and Natural Disaster Ministry of Education Beijing Normal University Beijing100875 China

Aerosol acidity (pH) plays a key factor in regulating aerosol composition;therefore, understanding the driving factors of aerosol pH is critical. In this study, the characteristics and driving factors of aerosol pH changes during different control periods during the 2022 Winter Olympics in four cities (Zhangjiakou, Baoding, Shijiazhuang, and Handan) in northern China, which were calculated via the ISORROPIA model, were studied on the basis of the observed air pollutants. The factors influencing the gas‒aerosol distribution of aerosol semivolatile components were explored. During the Winter Olympics, the aerosol pH in the four cities was between 2.75 and 4.66, which was weakly acidic. The aerosol pH in the four cities mostly peaked during the light-control period. control measures had a substantial effect on the concentration of gaseous precursors, and changes in sulfate, nitrate, and ammonium were the dominant driving factors for changes in aerosol pH during different periods. Ca2+ caused by dust was an important driving factor for the change in aerosol pH in Baoding. In the four cities, the temperature increased about 9°C from the strict-control period to the light-control period, and relative humidity increased about 15% from the light-control period to the noncontrol period. Therefore, temperature and relative humidity are also crucial driving factors of changes in aerosol pH. The pH, temperature, and aerosol liquid water content play important roles in the gas‒aerosol distribution of semivolatile components. This research can further elucidate the relationships among aerosol composition, aerosol pH, and meteorological factors, providing a scientific basis for formulating more effective aerosol control strategies. © 2024, The Authors. All rights reserved.

关键词： pH effects

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Volatile organic compounds in wintertime North China Plain:Insights from measurements of proton transfer reaction time-of-flight mass spectrometer(PTR-ToF-MS)

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Journal of environmental Sciences 2022年第4期34卷 98-114页

作者： Xianjun He Bin Yuan Caihong Wu Sihang Wang Chaomin Wang Yibo Huangfu Jipeng Qi Nan Ma Wanyun Xu Ming Wang Wentai Chen Hang Su Yafang Cheng Min Shao Institute for Environmental and Climate Research Jinan UniversityGuangzhou 511443China Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality Guangzhou 511443China State Key Laboratory of Severe Weather&Key Laboratory for Atmospheric Chemistry of China Meteorology Administration Chinese Academy of Meteorological SciencesBeijing 100081China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China Nanjing Intelligent Environmental Science and Technology Co. Ltd.Nanjing 211800China Max Planck Institute for Chemistry Mainz 55128Germany

The characteristics of wintertime volatile organic compounds(VOCs)in the North China Plain(NCP)region are complicated and remain *** measurements were conducted by a proton transfer reaction time-of-flight mass spectrometer(PTR-ToF-MS)at a rural site in the NCP from November to December *** ions measured by PTRToF-MS were quantified and the overall VOC compositions were investigated by combining the measurements of PTR-ToF-MS and gas chromatography-mass spectrometer/flame ionization detector(GC-MS/FID).The measurement showed that although atmospheric VOCs concentrations are often dominated by primary emissions,the secondary formation of oxygenated VOCs(OVOCs)is non-negligible in the wintertime,i.e.,OVOCs accounts for 42%±7%in the total VOCs(151.3±75.6 ppbV).We demonstrated that PTR-MS measurements for isoprene are substantially overestimated due to the interferences of *** chemical changes of organic carbon in a pollution accumulation period were investigated,which suggests an essential role of fragmentation reactions for large,chemically reduced compounds during the heavy-polluted stage in wintertime *** changes of emission ratios of VOCs between winter 2011 and winter 2018 in the NCP support the positive effect of“coal to gas”strategies in curbing air *** high abundances of some key species(*** aromatics)indicate the strong emissions of coal combustion in wintertime of *** ratio of naphthalene to C8 aromatics was proposed as a potential indicator of the influence of coal combustion on VOCs.

关键词： North China Plain Volatile organic compound Wintertime PTR-ToF-MS

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