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Boosting Generation of Reactive Oxygen and Chlorine Species on Tnt Photoanode and Ni/Graphite Fiber Cathode Towards Efficient Oxidation of Ammonia Wastewater

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SSRN 2022年

作者： Lu, Sen Li, Xuechuan Liao, Yunkai Zhang, Zhenghua Zhang, Guan State Key Laboratory of Urban Water Resource and Environment Shenzhen Key Laboratory of Organic Pollution Prevention and Control School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Shenzhen518055 China Institute of Environmental Engineering & Nano-Technology Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China

Photoelectrocatalytic (PEC) process combining the merits of photocatalysis and electrocatalysis is considered as a promising ammonia oxidation technology for water treatment. However, some key issues, such as the limited in situ generation of oxidants on photoanode, slow mass transfer problem and generation of nitrate/nitrite by–products hinder the further application of PEC process in the treatment of ammonia pollutant. In this study, the graphite felt (GF) cathodes modified by different transition metals (Ni, Fe, Mn, Co, Cu) were screened by physicochemical and photoelectrochemical characterizations. The results show that the Ni–GF cathode with more Ni 0 uniformly distributed on the GF surface had the best electrocatalytic activity to generate H 2 O 2 . The PEC system composed of 10 wt% Ni–GF cathode and optimized titania nanotubes (TNTs) photoanode selectively converted about 96.13% ammonia to N 2 within 90 min. Compared with the single TNTs photoanode system, the ammonia oxidation reaction rate constant of the synergistic PEC oxidation system was increased by about two times, which demonstrated the role of the oxidants simultaneously generated on both anode and cathode. The in situ generated reactive oxygen-based oxidants and chlorine-based oxidants interacted together, and ClO• acted a leading role in the ammonia oxidation which were confirmed by quenching and probe experiments. In addition, the contributions of •OH and ClO• were significantly improved in the synergistic PEC oxidation system, compared with the single TNTs photoanode oxidation system. Furthermore, the nitrate by–products generated by the ammonia oxidation were further reduced on the Ni–GF cathode. The large amount of active chlorine and active oxygen generated on the electrode diffused into the bulk, effectively overcoming the mass transfer limitation of direct oxidation. Therefore, the developed TNTs photoanode/Ni-GF cathode system can continuously and efficiently convert ammonia to N 2 without

关键词： Mass transfer

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A risk-based stochastic energy-water-carbon nexus analytical model to support provincial multi-system synergistic management – A case study of Shanxi, China

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Science of the Total environment 2024年 957卷 177608页

作者： Zheng, Y.L. Huang, G.H. Li, Y.P. Han, D.C. Luo, B. Liu, Y.Y. Tang, W.C. State Key Joint Laboratory of Environmental Simulation and Pollution Control China-Canada Center for Energy Environment and Ecology Research UR-BNU School of Environment Beijing Normal University Beijing China Environmental Systems Engineering Program University of Regina ReginaSKS4S 0A2 Canada Institute for Energy Environment and Sustainable Communities University of Regina 3737 Wascana Parkway ReginaSKS4S 0A2 Canada

The synergistic management of energy-water‑carbon (EWC) nexus systems is crucial for achieving the sustainable development goals (SDGs). Therefore, a non-deterministic interval chance-constrained fractional optimization model for EWC nexus system (ICCF-EWC) management has been developed in this study. This model is capable of handling uncertain parameters represented as stochastic probability distributions and interval values, providing an effective approach to addressing dual-objective optimization problems. Meanwhile, this model is expected to investigate the effect of water scarcity/carbon abatement pressure on the overall system, and potential synergistic abatement effects. A case study of Shanxi Province shows that over the next 30 years, the cumulative installed capacity for clean and renewable energy will exceed 65 %. The dominance of coal-fired electricity will be considerably diminished, with wind power overtaking coal/gas-fired power by around 30 %. Moreover, water scarcity and carbon mitigation pressure would promote the development of electricity conversion mode to clean energy rather than the large-scale carbon capture and storage (CCS) technology upgradation of thermal power. The results can help support low-carbon transition of power systems at a province-level in China and financial incentives related policy making to advance water conservation and carbon emission mitigation. The developed model can also be adapted to other energy resource-dependent regional power systems. © 2024 Elsevier B.V.

关键词： Carbon capture and utilization

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Impacts of climate change and agricultural activities on water quality in the Lower Kaidu River Basin,China

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Journal of Geographical Sciences 2020年第1期30卷 164-176页

作者： BA Wulong DU Pengfei LIU Tie BAO Anming CHEN Xi LIU Jiao QIN Chengxin State Key Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyCASUrumqi 830011China School of Energy and Power Engineering Xihua UniversityChengdu 610039China

In the context of climate change and over-exploitation of water resources, water shortage and water pollution in arid regions have become major constraints to local sustainable development. In this study, we established a Soil and Water Assessment Tool (SWAT) model for simulating non-point source (NPS) pollution in the irrigation area of the lower reaches of the Kaidu River Basin, based on spatial and attribute data (2010-2014). Four climate change scenarios (2040-2044) and two agricultural management scenarios were input into the SWAT model to quantify the effects of climate change and agricultural management on solvents and solutes of pollutants in the study area. The simulation results show that compared to the reference period (2010-2014), with a decline in streamflow from the Kaidu River, the average annual irrigation water consumption is expected to decrease by 3.84x10⁸ m³ or 8.87% during the period of 2040-2044. Meanwhile, the average annual total nitrogen (TN) and total phosphorus (TP) in agricultural drainage canals will also increase by 10.50% and 30.06%, respectively. Through the implementation of agricultural management measures, the TN and TP in farmland drainage can be reduced by 14.49% and 16.03%, respectively, reaching 661.56 t and 12.99 t, accordingly, and the increasing water efficiency can save irrigation water consumption by 4.41 x10⁸ m³ or 4.77%. The results indicate that although the water environment in the irrigation area in the lower reaches of the Kaidu River Basin is deteriorating, the situation can be improved by implementing appropriate agricultural production methods. The quantitative analysis results of NPS pollutants in the irrigation area under different scenarios provide a scientific basis for water environmental management in the Kaidu River Basin.

关键词： climate change agricultural management non-point pollutants SWAT Kaidu River Basin water quality

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The hidden risk of microplastic-associated pathogens in aquatic environments

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Eco-environment & Health 2023年第3期2卷 142-151页

作者： Huan Zhong Mengjie Wu Christian Sonne Su Shiung Lam Raymond W.M.Kwong Yuelu Jiang Xiaoli Zhao Xuemei Sun Xuxiang Zhang Chengjun Li Yuanyuan Li Guangbo Qu Feng Jiang Huahong Shi Rong Ji Hongqiang Ren School of Environment Nanjing UniversityState Key Laboratory of Pollution Control and Resource ReuseNanjing 210023China Department of Bioscience Arctic Research CentreAarhus UniversityRoskildeDenmark Higher Institution Centre of Excellence(HICoE) Institute of Tropical Aquaculture and Fisheries(AKUATROP)Universiti Malaysia Terengganu21030 Kuala NerusTerengganuMalaysia Department of Biology York University4700 Keele StreetTorontoON M3J 1P3Canada Tsinghua Shenzhen International Graduate School Shenzhen 518055China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Yellow Sea Fisheries Research Institute Chinese Academy of Fishery SciencesQingdao 266071China Institute of Environmental Research at Greater Bay Area Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou 510006China Key Laboratory of Environment and Health(HUST) Ministry of Education&Ministry of Environmental Protectionand State Key Laboratory of Environmental Health(Incubation)School of Public HealthTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Environmental Science and Engineering Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation TechnologySun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China University Centre for Research and Development Department of ChemistryChandigarh UniversityGharuanMohaliPunjabIndia

Increasing studies of plastisphere have raised public concern about microplastics(MPs)as vectors for pathogens,especially in aquatic ***,the extent to which pathogens affect human health through MPs remains unclear,as controversies persist regarding the distinct pathogen colonization on MPs as well as the transmission routes and infection probability of MP-associated pathogens from water to *** this review,we critically discuss whether and how pathogens approach humans via MPs,shedding light on the potential health risks *** on cutting-edge multidisciplinary research,we show that some MPs may facilitate the growth and long-range transmission of specific pathogens in aquatic environments,ultimately increasing the risk of infection in *** identify MP-and pathogen-rich settings,such as wastewater treatment plants,aquaculture farms,and swimming pools,as possible sites for human exposure to MP-associated *** review emphasizes the need for further research and targeted interventions to better understand and mitigate the potential health risks associated with MP-mediated pathogen transmission.

关键词： Microplastics Pathogens Colonization Transmission Public health

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Impacts of Climate Change on Chinese Agriculture: Greenhouse Gas Emission and Increased Costs of Agricultural Production

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SSRN 2024年

作者： Su, Meng Xia, Lin-Lin Chen, Lei Zhang, Yan Key Laboratory for City Cluster Environmental Safety and Green Development the Ministry of Education School of Ecology Environment and Resources Guangdong University of Technology Guangzhou510006 China Guangzhou Institute of Energy Conversion Chinese Academy of Sciences No.2 Nengyuan Rd. Wushan Tianhe District Guangzhou510640 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Xinjiekouwai Street No. 19 Beijing China

Previous researches has focused on the impact of climate change on agricultural factors such as yield, production value and price, but overlook how climate change affect food production. Based on a climate change impact function, this study aims to determine the relationship between climate change and production costs and associated greenhouse gas (GHG) emissions. We found that China's agricultural GHG emissions increased significantly due to climate warming, of which 67.1% was induced by temperature while no effect exerted by precipitation. Additionally, temperature affects 73.4% of the average production cost per hectare of the three main crops. Under SSP1-2.6, SSP2-4.5, and SSP5-8.5 scenarios, assuming constant technological and price levels, the production costs in 2060 will be 4.2, 5.3, and 6.3 times the 2020 values, respectively. Correspondingly, Agricultural GHG emissions will be 17.6, 22.5, and 27.3 times the 2020 values, respectively. Therefore, global warming poses a major challenge to China's future food production, arguing for effective scientific and executive actions to address this issue. Our study provides new insights into the impact of climate change on grain production in China, which is a reference for the development of decarbonization policies. © 2024, The Authors. All rights reserved.

关键词： Costs

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Vertical Distribution, Accumulation, and Characteristics of Microplastics in Mangrove Sediment in China

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SSRN 2022年

作者： Yu, Lingyun Li, Ruili Chai, Minwei Li, Bing Key Laboratory for Heavy Metal Pollution Control and Reutilization School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen518055 China Water Research Center Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China

Mangroves in tropical and subtropical regions worldwide have been recognized as important sinks for microplastics (MPs). However, most current studies have focused on surface sediments, and in China, the vertical distribution and characteristics of MPs in mangrove sediments remain poorly understood. In this study, sediment cores of 100 cm depth were taken from six representative mangroves in China to investigate MPs via chronological analysis. Futian was found to have the highest abundance of MPs (0–3,123 n/kg), followed by Zhanjiang, Dongzhaigang, Yunxiao, Dongfang, and Fangchenggang. The earliest MPs occurring in mangroves were dated to 1955, and the abundance of MPs increased exponentially from bottom to surface sediments. MPs were mainly characterized by white color, were fiber-shaped, 1,000–5,000 μm in size, and of polypropylene/polyethylene polymer types. Furthermore, the MPs in the urban mangrove also showed a higher diversity of color. The results showed that the MP stocks in the urbanized city Futian mangrove reached 1,828 mg/m 3 , an order of magnitude higher than in other areas (251±180 mg/m 3 ), contributing to 0.0057% of the carbon storage of the sediment. The abundance of MPs in mangrove sediments are expected to increase by 2.38–9.54 times by 2030, and therefore deserve further attention. © 2022, The Authors. All rights reserved.

关键词： Tropics

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Seasonal Variation Of Microplastics In Surface Water and Sediment Of The Xiangjiang River: An Inland Urban Drinking Water Source

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SSRN 2023年

作者： Zhao, Wenyu Li, Jing Liu, Mengyue Wang, Rui Zhang, Boxuan Meng, Xiang-Zhou Zhang, ShengWei School of Hydraulic and Environmental Engineering Changsha University of Science & Technology Changsha410114 China Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province School of Hydraulic and Environmental Engineering Changsha University of Science and Technology Changsha410004 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing100875 China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China

While the Xiangjiang (XJ) River acts as an inland drinking water source, it may experience microplastics emissions originating from Changsha (CS) City. The aim of this study was to characterize the occurrence and distribution of microplastics in the XJ River during both the flooding and dry periods. Samples of surface river water and sediment of the XJ River in CS City were collected in August and December, 2020 and analyzed for composition of microplastics. The results showed ubiquitous presence of microplastics in surface water and sediment of the XJ River at abundances of 0.72–18.6 (7.32 ± 2.36) items L−1 and 26.3–302 (150 ± 75.6) items kg−1 dry weight (dw), respectively, during the flooding period, lower than those of 2.88–17.7 (11.0 ± 3.08) items L−1 and 27.0–651 (249 ± 182) items kg−1 dw during the dry period. Higher microplastic abundance was found mainly in urban centers as well as downstream of wastewater treatment plants, implying anthropogenic activities to be a source of microplastics. The high variances in the shapes, color, and types of microplastics in surface waters and sediments implied the action of specific enrichment processes and long-term sources of microplastics pollution. Most (60%) of microplastics particles in both the river water and sediment were in the size range of 50–100 μm. Fourier transform infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM) indicated that microplastics were subjected to weathering in the environment, contributing to the production of oxygen-containing functional groups and surface cleavage features. Energy Dispersive Spectroscopy (EDS) showed that microplastics bonded to multiple heavy metals, emphasizing the complex nature of microplastics pollution. The results indicate concerning levels of microplastics in the XJ River, despite its status as a high-quality water source. © 2023, The Authors. All rights reserved.

关键词： Sediments

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Current progress on fluoride occurrence in the soil environment: Sources, transformation, regulations and remediation

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Chemosphere 2023年第1期341卷 139901页

作者： Wang, Minghan Wang, Haoyang Lei, Ge Yang, Biao Hu, Teng Ye, Yingying Li, Wei Zhou, Yaoyu Yang, Xiao Xu, Huaqin College of Environment and Ecology Hunan Agricultural University Changsha410128 China School of Biology and Chemistry Key Laboratory of Chemical Synthesis and Environmental Pollution Control-Remediation Technology of Guizhou Province Minzu Normal University of Xingyi Xingyi562400 China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China

Fluorine is a halogen element widely distributed in nature, but due to excessive emissions from industrial manufacturing and agricultural production, etc., the soil is over-enriched with fluoride and the normal growth of plants is under stress, and it also poses a great threat to human health. In this review, we summarized the sources of fluoride in soil, and then analyzed the potential mechanisms of fluoride uptake in soil-plant systems. In addition, the main influences of soil ecosystems on plant fluoride uptake were discussed, soil management options to mitigate fluoride accumulation in plants were also summarized. The bioremediation techniques were found to be a developmental direction to improve fluoride pollution. Finally, we proposed other research directions, including fluoride uptake mechanisms in soil-plant systems at the molecular expression levels, development of visualization techniques for fluoride transport in plants, interactions mechanisms between soil microhabitats and plant metabolism affecting fluoride uptake, as well as combining abiotic additives, nanotechnology and biotechnology to remediate fluoride contamination problems. © 2023

关键词： Soils

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Single-Cell-Resolution Analysis Revealing Hydrodynamics and Morphology Effect on Biofilm Detachment

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SSRN 2023年

作者： Wang, Shuai Zhu, Huiyan Zhang, Rui Wang, Xiaoxiang Institute for Carbon-Neutral Technology Shenzhen Polytechnic Shenzhen518055 China State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of the Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China School of Water Conservancy and Environment University of Jinan Jinan250022 China

Understanding the process of biofilm detachment is crucial for effectively managing biofilm life cycle and mitigating its adverse consequences. In this work, we used fluorescence experiments, computational fluid dynamics (CFD) simulations, and machine learning approaches, specifically artificial neural network (ANN), to investigate the mechanisms involved in the detachment of S. oneidensis MR-1 biofilm. The results found that external shearing stress contributed by hydrodynamics and the initial morphology of the biofilm can both affect the detachment of the biofilm. In areas of high biofilm roughness, fluid flow can generate vortices or eddies, which create pressure gradients and accelerate detachment. Sensitivity analysis based on machine learning showed that biofilm roughness initially increased detachment rates, but the effect reached a plateau when roughness exceeded 0.6. Additionally, the model revealed a sigmoidal trend of detachment rates with increasing relative thickness and a monotonic increasing trend with higher pressure exposure on the biofilm surface. © 2023, The Authors. All rights reserved.

关键词： Neural networks

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Synchronously Enhanced Biofilm Formation and M-Dichlorobenzene Removal in Biotrickling Filters by Rhamnolipid Chelating Rare Earth Elements

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SSRN 2022年

作者： Yang, Bairen Wang, Jiajie Shang, Qingqing Ding, Cheng Sun, Zhuqiu School of Environmental Science and Engineering Yancheng Institute of Technology Yancheng224051 China Environmental Simulation and Pollution Control State Key Joint Laboratory School of Environment Tsinghua University Beijing100084 China

Hydrophobic and highly toxic VOCs removal has always been a challenge for biotrickling filters (BTFs). In this study, rhamnolipid chelating La (III) or Nd (III) were used to improve gaseous m -dichlorobenzene removal, and their effects on biofilm growth were investigated. The results showed that the optimal concentrations of rhamnolipid, La (III) and Nd (III) were 110 mg/L, 0.2 mg/L and 0.4 mg/L, respectively. The rhamnolipid chelating La (III) or Nd (III) significantly increased the average m -dichlorobenzene elimination capacity by 24% and 29% respectively, and the average wet weights of biomass in BTFs from 11 kg/m 3 to 15 kg/m 3 in BTFs. Microbial community functional genes about biofilm growth and m -dichlorobenzene removal were increased by rhamnolipid chelating La (III) or Nd (III). In addition, the changes of bacterial characteristics indicated that rhamnolipid chelating La (III) or Nd (III) can improve the membrane permeability, extracellular polymeric substance (EPS) production, catechol 2,3 dioxygenase (C23O) enzyme and chlorobenzene dioxygenase activity, and this partly explains why rhamnolipid chelating La (III) or Nd (III) can improve simultaneously m -dichlorobenzene removal and biofilm growth. These results demonstrate that rhamnolipid chelating La (III) or Nd (III) have the potential to improve the performance of BTFs treating hydrophobic and highly toxic VOCs. © 2022, The Authors. All rights reserved.

关键词： Biofilms

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