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SSRN 2024年

作者： Luo, Moye Cao, Shaohua Xu, Chenghua Zhang, Xiaodong Zhu, Xin Zhan, Manjun Yu, Dandan Long, Tao Yu, Ran Department of Environmental Science and Engineering School of Energy and Environment Southeast University Jiangsu Nanjing210096 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 Jiangsu Nanjing210042 China Jiangsu geological engineering environment Intelligent Monitoring Engineering Research Center The First Geological Brigade of Jiangsu Provincial Bureau of Geology and Mineral Resources Jiangsu Nanjing210041 China Nanjing Research Institute of Environmental Protection Nanjing Environmental Protection Bureau Jiangsu Nanjing210013 China

The bioremediation of chlorinated ethenes (CEs) contaminated groundwater is attracting increasingly attention in practical remediation projects. However, modelling of microbial metabolic processes under the constraints of substrate and environmental factors is inadequate. This study developed a new kinetic model, which incorporated the logistic model and Dual-Monod kinetic to represent the interaction between the controlled microbial growth and the bioavailable substrates in CE-contaminated groundwater. The proposed model was based on discrete observations to simulate microbial growth under the constraints of substrate and environmental conditions, reducing the amount of observational data required for the model. Meanwhile, the proposed model introduced two new kinetic parameters, the effective specific growth rate [[EQUATION]] and the real self-limiting coefficient of microbial growth [[EQUATION]], to simplified the number of independent parameters. A parameter estimation method based on the proposed Newton's algorithm for the proposed model was also developed. The model was validated based on the hypothetical data, experimental results, and a published dataset, demonstrated the successful simulation of microbial growth and the sequential biodegradation of PCE in groundwater systems (*E © 2024, The Authors. All rights reserved.

关键词： Biodegradation

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Size-Fractionated Distribution of Glycerol Dialkyl Glycerol Tetraether Core Lipids in Surface Sediments of a Large-River Delta-Front Estuary

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SSRN 2023年

作者： Wang, Jinpeng Zhao, Bin Yao, Peng State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental Sciences Ministry of Ecology and Environment of the People’s Republic of China Guangzhou510530 China Key Laboratory of Marine Eco-Environmental Science and Technology First Institute of Oceanography Ministry of Natural Resources Qingdao266061 China Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China Qingdao266100 China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao266237 China

Glycerol dialkyl glycerol tetraether core lipids (GDGTs) are microbial biomarkers ubiquitously distributed in terrestrial and marine soils/sediments. Dispersal and fate of GDGTs in an estuary largely depends on sediment grain size, however, their size distribution remains poorly understood. Here, surface sediments collected from the Changjiang Estuary were separated into five size fractions ( 125 µm) and analyzed for GDGTs as well as total organic carbon (TOC) and its stable isotopic composition, and lignin phenols, to investigate the size and spatial distributions of these parameters in the estuarine system. The contents of isoprenoidal GDGTs (iso-GDGTs) were more abundant in the finest fractions and in off-estuary sites. The contents of branched GDGTs (br-GDGTs) were high not only in the finest fractions but also in large fractions (> 32 μm fractions). And thus, br-GDGTs are mainly deposited near the estuary along with coarse particles, but a part of br-GDGTs attached to fine particles can be selectively transported off the estuary. Differentiated distributions of iso-GDGTs and br-GDGTs among size fractions and selective dispersal of these sediments resulted in a sharp decrease of the branched and isoprenoid tetraether (BIT) index from the estuary (~0.52) to the shelf (~0.16). Although BIT values of these sediments were relatively high (> 0.1), the occurrence of co-variation of br-GDGTs and crenarcheaol in estuarine sediments was likely due to the association of different GDGTs in sediments that have different size compositions, and could still imply in-situ production of br-GDGT. Among size fractions, OC fractions derived from the BIT index (fsoil-BIT) was significantly correlated with fterrestrial OC based on a mixing model, indicating that BIT tracked a broader pool of terrestrial OC than just soil OC. More work is needed to further clarify the applicability of BIT in estuaries as a proxy for OC sources. © 2023, The Authors. All rights reserved.

关键词： Glycerol

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Temporal Variations of Major Inorganic Nutrient Concentration and Their Influences on Harmful Algal Blooms in the Bohai Sea Over the Past Thirteen Years

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SSRN 2023年

作者： Xiao, Rushui Zhang, Yuming Zhao, Zihan Guo, Junting Zhang, Shufang Lv, Xianqing Shi, Honghua Physical Oceanography Laboratory Ocean University of China Qingdao China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control Ministry of Ecology and Environment of the People’s Republic of China Guangzhou China National Marine Environment Monitoring Center Dalian116023 China First Institute of Oceanography Ministry of Natural Resources Qingdao266061 China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology Qingdao266237 China

The Bohai Sea (BHS) has been subjected to harmful algal blooms (HABs). In this study, we compiled and analyzed datasets of HABs and related environmental parameters in BHS from 2006 to 2018 including dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP). However, quarterly monitoring cannot give direct in-situ observations when HABs happened. Therefore, we reconstructed spatially discrete seasonal observations to a spatial resolution of 0.25°*0.25° continuous monthly data from August 2006 to October 2019 using Chebyshev Polynomial Fitting (CPF) and seasonal decomposition methods. It was concluded that a coherent growing trend of the DIN and DIN/DIP ratio transitioned to a lowering trend from 2013, whereas the DIP concentration exhibits a consistent falling trend from 2012 to 2019. the occurrence of HABs was successfully controlled by the reduction of DIN and DIP, but the reduction may promote the occurrence or intensity of HABs events in some particular algal species. © 2023, The Authors. All rights reserved.

关键词： Dissolution

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Influence of surface properties and antecedent environmental conditions on particulate-associated metals in surface runoff

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环境科学与技术 2020年第4期2卷 47-53页

作者： Zhenvu Wang Pei Hua Heng Dai Rui Li Beidou Xi Dongwei Gui Jin Zhang Peter Krebs Institute of Urban Water Management Technische Universit(a)t Dresden 01062 Dresden Germany The Environmental Research Institute MOE Key Laboratory of Environmental Theoretical Chemistry South China Normal University 510006 GuangzhouChina Institute of Groundwater and Earth Sciences Jinan University 510632 Guangzhou China State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental Sciences Beijing 100012 China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and Geography Chinese Academy of SciencesUrumqi 830011 XinjiangChina

Particulate-associated trace metals have been regarded as an important pollution source for urban surface ***,Pb,Cu,Zn and total solids (TS) washed off two different surfaces (low-elevated facade and road surfaces) under two kinds of antecedent environmental conditions (dry and snow-melting) were determined in this ***-vacuuming sweeping (WVS) and surface washing (SW) methods,representing the maximum pollution potential and common rainfall-induced wash-off condition respectively,were used to collect the particulate *** result shows that the wash-off concentrations of trace metals were found in the order of Cd (2.28 ± 2.08 μg/l) ＜ Pb (435.85 ± 412.61 μg/l) ＜ Cu (0.93 ± 0.61 mg/l) ＜ Zn (2.52 ± 2.30 mg/l).The snow-melting process had a considerable influence on the wash-off concentrations of the trace metals on both road and facade *** reduced ＞38％ and ＞79％ of metals and TS concentrations in the facade surface and road surface runoff *** wash-off concentrations of Cd,Cu,and Zn on the road surface 45-780％ higher than those on the facade *** sensitivity analysis based on the Bayesian network indicates that the wash-off concentrations of metals were mainly dependent on the antecedent environmental conditions or the surface properties while the sampling methods had a minor ***,to accurately model the pollutant migration in the surface runoff requires an improving method considering different surfaces and antecedent environment conditions.

关键词： Trace metal Road and facade Wash-off Snowmelt Bayesian network

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Electron Transfer Capacity of Humic Acid in Soil Micro and Macro Aggregates in Response to Mulching Years

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SSRN 2021年

作者： Zhang, Yifan Hui, Kunlong Yuan, Ying Tan, Wenbing College of Environmental Science and Engineering Guilin University of Technology Guilin541006 China State Key Laboratory of Environmental Criteria and Risk Assessment State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental Sciences Beijing100012 China School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China

Plastic film mulching can help farmers meet food production requirements and even increase output. However, it is not clear whether the long-term use of mulching film will affect the electron transfer capacity (ETC) of natural organic matter in the soil. This study evaluated the electron-accepting capacity (EAC) and electron-donating capacity (EDC) of soil humic acid (HA) in different-size aggregates in response to film mulching years. The EAC of HA in the soil showed a downward trend as mulching years increased, while the EDC fluctuated. EAC decline in microaggregates (MIA) was more significant than that of macroaggregates (MAA). Film mulching changes the pH, nitrogen, and metal content of the soil, reduces soil enzyme activity, changes the chemical structure of HA, and ultimately affects HA electron transfer. In addition, compared with that in MAA, the chemical structure of soil HA in MIA has a stronger correlation with enzyme activity and ETC and thus is more significantly affected by mulching. These results provide an in-depth understanding of the role of HA in soil aggregates of different sizes in processes related to the agricultural soil environment under mulching conditions. © 2021, The Authors. All rights reserved.

关键词： Organic acids

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Electrochemical Treatment of Waste Activated Sludge: Performance, Mechanism and Improvement Possibilities

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SSRN 2022年

作者： Lu, Sijia Zheng, Xing Li, Xiaoliang Tang, Gang Liu, Tong Ke, Yanchun Liu, Bao Wu, Hua State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi’an University of Technology Xi’an710048 China State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control Southern University of Science and Technology Shenzhen518055 China Aerospace Kaitian Environmental Technology Co. Ltd. Changsha410100 China Yixing 214205 China

In this study, a PbO2 plate electrode was synthesized and optimized for the electrochemical treatment application of waste activated sludge from a municipal wastewater treatment . The sludge dewaterability and mass reduction with different electrolysis time and voltage were quantified to evaluate the treatment efficiency. The mechanism of cell breaking was studied by evaluating different electrochemical oxidation pathways. Results showed that the electrochemical treatment at a voltage of 25 V and electrolysis time of 120 min decreased the dewatering rate of sludge by 35.9%, and the concentration of mixed liquor suspended solids (MLSS) was reduced by 33.7%. Using Scanning Electron Microscope (SEM) and Cell fluorescence staining experiments the impact on the integrity of sludge cells was evaluated. Results showed that electrochemical process clearly destroyed the sludge cell structure and lead to the cell death . Further investigation revealed that hydroxyl radicals (·OH) and sulfate radicals (SO4·- ) produced during the electrochemical treatment played a major role in the cell wall-breaking, while chloride ions (Cl- ) in the electrolyte significantly enhanced the effect due to formation of chloride-related oxidants. The PbO2 electrode was modified by reduced graphene oxide (RGO) to improve the ·OH production capacity. Results showed that the PbO2 (0.05 RGO by wt.%) electrode had the highest ·OH production rate (81.7 μmol/(cm2 ·min)). The electrode improved the removal of MLSS and MLVSS by 11.3% and 11.5%, respectively. And the sludge dewatering and cell destruction were enhanced by 7% and 15.1%, respectively. Adding more NaCl was confirmed as an effective and readily methods to improve the electrochemical performance of sludge treatment mainly due to the higher content of active Cl- species formed. © 2022, The Authors. All rights reserved.

关键词： Electrochemical oxidation

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Unit-Based Emissions and environmental Impacts of Industrial Condensable Particulate Matter in China in 2020

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SSRN 2022年

作者： Wang, Kun Gao, Jiajia Liu, Kaiyun Tong, Yali Dan, Mo Zhang, Xiaoxi Liu, Chunlei Department of Air Pollution Control Institute of urban safety and environmental science Beijing academy of science and technology Beijing100054 China Key Laboratory of Marine Environmental Science and Ecology Ministry of Education Ocean University of China Qingdao266100 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Shanghai Minhang District Qingyue Environmental Protection IT Service Center Shanghai201199 China

The emission of condensable particulate matter (CPM) and its environmental impacts are arousing concern in China with the effective control of filter particulate matter (FPM). This study established an up-to-date and unit-based CPM emission inventory for industrial sectors and systematically evaluated the effects of CPM on primary and secondary PM2.5 in China. In 2020, the national CPM emissions total for industrial sectors was estimated to be 0.98 Tg with uncertainty from −49% to 66%, including 0.62 Tg of organic CPM (CPMorg) and 0.36 Tg of inorganic CPM (CPMin). Totals of 62%, 23% and 8% CPM were emitted from coal-fired power plants, coal-fired industrial boilers and sinter plants, respectively. By filling CPM emissions in PM2.5 simulation, the normalized mean bias (NMB) of model to observation was improved from −27% to −14% in East, North and Central China. The 4 μg/m3 PM2.5 concentration was attributed to CPM emissions in this region, accounting for 10% of observations. On "polluted" days (PM2.5 >75 μg/m3), industrial CPM emissions can contribute 7 μg/m3 PM2.5 in North China, wherein more than 75% of the secondary PM2.5 can be caused by CPMorg emissions. Therefore, China should focus on controlling CPM from coal combustion to ensure continuous air quality improvement. © 2022, The Authors. All rights reserved.

关键词： Coal

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Trickling filter in a biocathode microbial fuel cell for efficient wastewater treatment and energy production

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Science China(Technological Sciences) 2019年第10期62卷 1703-1709页

作者： CAO Xin LIANG Peng SONG XinShan WANG YuHui Qiu Yong HUANG Xia State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Scienceand EngineeringDonghua UniversityShanghai201620China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China

Aiming to reduce the energy input, oxygen supply by trickling filter was employed in a biocathode microbial fuel cell(MFC) to examine its performance of electricity production and sewage treatment. During batch operation, trickling MFC(TMFC) could start and aerate effectively(DO>3.60 mg/L). During continuous operation, TMFC produced a maximum current density of 71.8 A/m^3 and maximum power density of 26.2 W/m^3 under the hydraulic retention time(HRT) of 10 h. By increasing the HRT to 15 h, 90.6% of COD and 99.0% of ammonia in simulated domestic sewage were efficiently removed and the maximum power density was 19.4 W/m^3. Continuous purification of real municipal wastewater achieved 85.9% of COD removal rate and 91.6%of ammonia removal rate. Sequencing result of biocathodic microorganisms indicated that it consisted of four major classes and the dominant class was γ-proteobacteria, which accounted for up to 84.38%. The dominant genus was Acinetobacter, which accounted for 57.81%. The phylogenetic tree showed different relationships among the 19 species of biocathode microorganisms and the predominant species was Acinetobacter calcoaceticus.

关键词： microbial fuel cell biocathode trickling filter electricity generation sewage purification

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Role of Black Carbon in Modulating Aerosol Direct Effects Driven by Air pollution controls During 2013-2017 in China

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SSRN 2022年

作者： Zhang, Fenfen Xing, Jia Ding, Dian Wang, Jiandong Zheng, Haotian Zhao, Bin Qi, Ling Wang, Shuxiao State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing100084 China Institute for Atmospheric and Earth System Research Faculty of Science University of Helsinki Helsinki00014 Finland School of Atmospheric Physics Nanjing University of Information Science and Technology Nanjing210044 China School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing100083 China

Aerosol direct effects (ADEs) can modulate shortwave radiation as well as atmospheric dynamics and air quality. As the key absorbing component of aerosol, the black carbon (BC) largely determines the aerosol optical properties. Therefore, it is expected that BC emission controls might gain co-benefits from the simultaneous reduction of ADEs. To demonstrate such synergy, we quantified the ADEs changes and role of BC controls in China during 2013-2017 using a regional two-way coupled meteorology chemistry transport model. Results suggest that the control action effectively reduced wintertime PM2.5 concentration (-26.0 μg m-3) and associated ADEs. The influence of ADEs on surface shortwave radiation, 2-meter temperature, and planetary boundary layer height was weakened from -16.7 W m-2, -0.20°C, and -15.4 m in 2013 to -11.3 W m-2, -0.06°C, and -10.7 m in 2017, respectively. The enhancement of SO2, NO2, and PM2.5 concentrations due to ADEs was reduced from +3.1%, +5.2%, and +5.4% in 2013, to +2.6%, +4.5%, and +3.3% in 2017, respectively, demonstrating the extra benefit of air pollution controls by reducing ADEs. The BC emission reduced by 12.5% simultaneously along with the effective controls during 2013-2017. Such BC controls contributes 15.6-60.2% of such changes in the ADEs influence on meteorological variables, and 32.6-41.1% on air pollutants. More specially, the effectiveness of collaborative reduction of BC further reduced surface shortwave radiation in China by 3.6 W m-2 in January and 1.0 W m-2 in July, leading to a more weakened ADEs that bring extra benefits in reducing PM2.5 concentrations by 1.8 μg m-3 in January and 0.3 μg m-3 in July. Apparently, BC played a dominant role in modulating the ADEs and associated influences on meteorology and air quality, suggesting a wise control strategy by targeting absorbing component of PM2.5 reduction to address both air pollution and climate change in the future. © 2022, The Authors. All rights reserved.

关键词： Air quality

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Ammonia and phosphorus removal from using cash crop waste-derived agricultural runoff biochars

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Frontiers of environmental Science & Engineering 2020年第3期14卷 141-153页

作者： Alisa Salimova Jian'e Zuo Fenglin Liu Yajiao Wang Sike Wang Konstantin Verichev State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Beijing JingYi Air Protection&Technology Company Wanda Plaza93 Jianguo RoadChaoyang DistrictBeijing 100022China Institute of Civil Engineering Faculty of Engineering SciencesUniversidad Austral de ChileValdivia 5090000Chile

Adsorption of biochars(BC)produced from cash crop residuals is an economical and practical technology for removing nutrients from agricultural *** this study,B C made of orange tree trunks and tea tree twigs from the Laoguanhe Basin were produced and modified by aluminum chloride(Al-modified)and ferric sulfate solutions(Fe-modified)under various pyrolysis temperatures(200℃-600℃)and residence times(2-5 h).All produced and modified B C were further analyzed for their abilities to adsorb ammonia and phosphorus with initial concentrations of 10-40 mg/L and 4-12 mg/L,***-modified Tea Tree B C 2h/400℃showed the highest phosphorus adsorption capacity of 0.56 mg/***-modified Orange Tree B C 3h/500℃showed the best performance for ammonia removal with an adsorption capacity of 1.72 mg/*** characterization showed that P=O bonds were formed after the adsoiption of phosphorus by modified BC,N-H bonds were formed after ammonia adsorption.X P S analysis revealed that the key process of ammonia adsorption was the ion exchange between K+and N H *** adsorption was related to oxidation and interaction between PO43-and Fe3+.According to X R D results,ammonia was found in the form of potassium amide,while phosphorus was found in the form of iron hydrogen *** sorption isotherms showed that the Freundlich equation fits better for phosphorus adsorption,while the Langmuir equation fits better for ammonia *** simulated runoff infiltration experiment showed that 97.3%of ammonia was removed by Al-modified Orange tree B C 3h/500℃,and 92.9%of phosphorus was removed by Fe-modified Tea tree B C 2h/400℃.

关键词： Biochar Adsorption Ammonia removal Phosphorus removal Agricultural runoff

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