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Sulfur cycle as an nitrate in a electron mediator between carbon and constructed wetland microcosm

Frontiers of environmental Science & Engineering 2020年第4期14卷 17-29页

作者： Wenrui Guo Yue Wen Yi Chen Qi Zhou State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Key Laboratory of the Three Gorges Region's Eco-Environment Ministry of EducationCollege of Environment and EcologyChongqing UniversityChongqing 400044China

A constructed wetland microcosm was employed to investigate the sulfur cycle-mediated electron transfer between carbon and *** accepted electrons from organics at the average rate of 0.84 mol/(m3·d)through sulfate reduction,which accounted for 20.0%of the electron input *** remainder of the electrons derived from organics were accepted by dissolved oxygen(2.6%),nitrate(26.8%),and iron(III)(39.9%).The sulfide produced from sulfate reduction was transformed into acidvolatile sulfide,pyrite,and elemental sulfur,which were deposited in the substratum,storing electrons in the microcosm at the average rate of 0.52 mol/(m3·d).In the presence of nitrate,the acid-volatile and elemental sulfur were oxidized to sulfate,donating electrons at the average rate of 0.14 mol/(m3•d)and driving autotrophic denitrification at the average rate of 0.30 g N/(m3·d).The overall electron transfer efficiency of the sulfur cycle for autotrophic denitrification was 15.3%.A mass balance assessment indicated that approximately 50%of the input sulfur was discharged from the microcosm,and the remainder was removed through deposition(49%)and plant uptake(1%).Dominant sulfatereducing(i.e.,Desulfovirga,Desulforhopalus,Desulfatitalea,and Desulfatirhabdium)and sulfuroxidizing bacteria(i.e.,Thiohalobacter,Thiobacillus,Sulfuritalea,and Sulfurisoma),which jointly flilfilled a sustainable sulfur cycle,were *** results improved understanding of electron transfers among carbon,nitrogen,and sulfur cycles in constructed wetlands,and are of engineering significance.

关键词： Constructed wetland Sulfur cycle Electron transfer Denitrification

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Recalcitrant dissolved organic matter in lakes: a critical but neglected carbon sink

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Carbon Research 2024年第1期3卷 1-5页

作者： Xia, Fan Zhou, Yongqiang Zhou, Lei Zhang, Yunlin Jeppesen, Erik Taihu Laboratory for Lake Ecosystem Research State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing210008 China University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences 71 East Beijing Road Nanjing210008 China Aarhus University C.F. Møllers Allé Building 1131 Aarhus8000 Denmark Sino-Danish Centre for Education and Research Beijing100190 China Limnology Laboratory Department of Biological Sciences and Centre for Ecosystem Research and Implementation Middle East Technical University Ankara06800 Turkey Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental Science Yunnan University Kunming China

Lakes are hotspots for the biogeochemical processing of carbon, including dissolved organic matter (DOM). A less degradable fraction of DOM, preserved for a long time, can be categorized as recalcitrant DOM (RDOM). Lake RDOM is an important but neglected carbon sink, and its characteristics and transformation processes remain largely unknown. © The Author(s) 2024.

关键词： Carbon sequestration

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A confinement strategy to in-situ prepare a peanut-like N-doped, C-wrapped TiO_(2) electrode with an enhanced desalination capacity and rate for capacitive deionization

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Nano Research 2021年第3期14卷 684-691页

作者： Mingxing Liang Xueting Bai Fei Yu Jie Ma College of Marine Ecology and Environment Shanghai Ocean UniversityShanghai201306China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai200092China Research Center for Environmental Functional Materials College of Environmental Science and EngineeringTongji University1239 Siping RoadShanghai200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092China

Capacitive deionization(CDI)technology has been considered a promising desalination technique,especially for brackish water,because of its relatively low energy consumption,facile operation,and easy regeneration of ***,the desalination capacity,cost,fabrication method,electrochemical stability,and environmental unfriendliness of the electrodes have restricted the practical application of the CDI ***,we reported the one-step in situ preparation of nitrogen-doped and carbon-decorated MXene-derived TiO_(2)(termed N-TiO_(2−x)/C)through the confinement-growth *** small particle size(∼25 nm)and uniform distribution of a peanut-like N-TiO_(2−x)/C material could be ascribed to the confined growth space created by the nanoporous structure of melamine *** defects produced by N doping provide an enhanced electrical conductivity and more adsorption sites,while wrapping with a carbon shell layer increases the conductivity and offers protection for N-TiO_(2−x) to achieve an excellent electrochemical *** prepared N-TiO_(2−x)/C electrode is hydrophilic due to the abundant oxygen-containing functional groups(e.g.,C-O,N-Ti-O,-NO_(x),and-OH)and exhibits a high salt removal capacity(33.4 mg·g^(−1)),desalination rate(1.5 mg·g^(−1)·min^(−1)),and remarkable cycling stability(without declining after 100 cycles),which might be ascribed to the synergistic effects of the short ion diffusion path,more active adsorption sites,enhanced conductivity,pseudocapacitive behavior,and protection of the carbon shell *** work provides a confined-growth strategy to develop MXene-derived oxide electrodes for electrochemical desalination.

关键词： capacitive deionization confinement growth MXene-derived N-doped pseudocapacitive behavior

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Phosphorus removal from sediments by Potamogeton crispus:New high-resolution in-situ evidence for rhizosphere assimilation and oxidization-induced retention

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Journal of environmental Sciences 2021年第11期33卷 181-192页

作者： Hezhong Yuan Yiwei Cai Zhen Yang Qiang Li Enfeng Liu Hongbin Yin Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control and Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China Department of Soil Science University of Wisconsin-Madison53706 MadisonWIUnited States College of Geography and Environment Shandong Normal UniversityJi’nan 250359China

Macrophytes are usually chosen for phytoremediation tools to remove P in eutrophic aquatic ecosystems,but the lack of test methods hinders the understanding of removal mechanism and *** this study,we used the novel technologies combined of Diffusive gradients in thin films(DGT),Planar optode(PO),and Non-invasive micro-test technology(NMT)to explore P dynamics in water-sediment continuum and rhizosphere of Potamogeton crispus over *** of the high-resolution in situ measurement showed that labile P(LPDGT)fluxes at the surficial sediment significantly decreased from approximate 120,140,and 200 pg/(cm^(2)·sec)via 30 days incubation period to 17,40,and 56 pg/(cm2•sec)via that of 15 *** synchronous increase of LPDGT was not detected in overlying water,suggesting the intense assimilation of dissolve reactive P via root over *** measurement indicated that O_(2)concentration around the rhizosphere remarkably increased and radially diffused into deeper sediment until 100%saturation along with the root stretch *** detection of roots showed the obvious O_(2)inflow into root tissue with the uppermost flux of 30 pmol/(cm2•sec)from surroundings via aerenchyma on different treatment *** from previous reports,gradually saturating O_(2)concentrations around the rhizosphere was principally driven by O_(2)penetration through interspace attributing to root stretch downward rather than root O_(2)*** O_(2)concentrations in deep sediment over time finally induced the oxidization of labile Fe(II)into Fe(III)bound P and local P immobilization.

关键词： Phosphorus removal Potamogeton crispus Diffusive gradients in thin films (DGT) Planar optode(PO) Non-invasive Micro-test Technique (NMT) Rhizosphere

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In Situ Fabrication of Highly Dispersed Co-Fe-Doped-Δ-Mno2 Catalyst by a Facile Redox-Driving Mofs-Derived Method for Low-Temperature Oxidation of Toluene

SSRN

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SSRN 2022年

作者： Huang, Qianlin Zhao, Puzhen Wang, Weiwei Lv, Lu Zhang, Weiming Pan, Bingcai State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Herein, a facile redox-driving MOFs-derived method was successfully developed to fabricate highly dispersed Co-Fe-doped-δ-MnO2 catalysts (Co-Fe-δ-MnO2) for low-temperature oxidation of toluene. The as-obtained Co-Fe-δ-MnO2-20% catalyst exhibited high catalytic activity (225℃) and robust durability in the presence of 5vol.% water vapor. This excellent catalytic performance was primarily ascribed to its unique MOFs-like nanostructure, rich oxygen vacancies, weaker Mn-O bond strength, and good reducibility at low temperatures, which originated from successfully inheriting the framework structures of MOFs and the highly ordered properties of Co and Fe metal clusters in MOFs to realize homogenous co-doping. Furthermore, in-situ DRIFTS spectra results confirmed both adsorbed oxygen (Oads) and lattice oxygen (Olatt) could simultaneously participate in the toluene degradation, and revealed that more Oads and high-mobility Olatt induced by this method contribute to accumulating and mineralizing key intermediate, and thus promoting the toluene degradation. © 2022, The Authors. All rights reserved.

关键词： Volatile organic compounds

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Real-Time Visualized Generator for the simulation of Wastewater Quality and Quantity Variations in the Sewer System

SSRN

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SSRN 2024年

作者： Liu, Yanchen Islam, Md Sahidul Huang, Xia Li, Bo Chen, Jiale Min, HongPing Tang, Dingding Mao, Jianhua Wang, Moran Zhang, Mingkai Shi, Hanchang State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China China Construction Third Bureau Green Industry Investment Co. Ltd Wuhan430100 China Beijing Enterprises Water Group Limited Beijing100102 China South China Institute of Environmental Science Ministry of Ecology and Environment Guangzhou510655 China

The lack of information or missing connection of sewer pipes in both combined and separated systems seriously disturbs the obtaining of real regulated operational information of the sewerage system. In order to accurately regenerate the lost actual operational data along sewer shed, a visualized generator based on real-time monitoring data was developed to simulate wastewater quantity and quality variations within different scales in sewer system. A novel instantaneous unit pollutant-hydrograph modeling associated with simple wastewater electric conductivity monitoring data was proposed in the generator. The validated generation data of flow, COD, ammonia nitrogen, and phosphate were well-fitted with the full-scale monitoring data in residential areas, pump stations, and WWTPs. This generator could be used to predict and simulate the dynamic flow and wastewater quality variations at any sewer network-wide location. The dynamic wastewater quality and quantity along the whole sewer-shed could be simulated based on the modular flow generator to support the operation and management of pump stations and WWTPs. © 2024, The Authors. All rights reserved.

关键词： Ammonia

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Formable porous biochar loaded with La-Fe(hydr)oxides/montmorillonite for efficient removal of phosphorus in wastewater:process and mechanisms

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Biochar 2022年第1期4卷 296-314页

作者： Enhui Sun Yanyang Zhang Qingbo Xiao Huayong Li Ping Qu Cheng Yong Bingyu Wang Yanfang Feng Hongying Huang Linzhang Yang Charles Hunter Key Laboratory of Saline-Alkali Soil Improvement and Utilization(Coastal Saline-Alkali Lands) Ministry of Agriculture and Rural AffairsJiangsu Collaborative Innovation Center for Solid Organic Waste Resource UtilizationInstitute of Agricultural Resources and EnvironmentJiangsu Academy of Agricultural SciencesNanjing 210014China School of Life Sciences College of AgricultureEngineering and ScienceUniversity of KwaZulu-Natal(Pietermaritzburg Campus)Private Bag X01Scottsville 3209Republic of South Africa State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Institute of Germplasm Resources and Biotechnology Jiangsu Academy of Agricultural SciencesNanjing 210014China Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China

The development of biochar-based granule-like adsorbents suitable for scaled-up application has been attracting increasing attention in the field of water ***,a new formable porous granulated biochar loaded with La-Fe(hydr)oxides/montmorillonite(LaFe/MB)was fabricated via a granulation and pyrolysis process for enhanced phosphorus(P)removal from *** acted as a binder that increased the size of the granulated biochar,while the use of Fe promoted the surface charge and facilitated the dispersion of La,which was responsible for selective phosphate ***/MB exhibited rapid phosphate adsorption kinetics and a high maximum adsorption capacity(Langmuir model,52.12 mg P g^(−1)),which were better than those of many existing granulated *** desorption and recyclability experiments showed that LaFe/MB could be regenerated,and maintained 76.7%of its initial phosphate adsorption capacity after four adsorption *** high hydraulic endurance strength retention rate of the developed material(91.6%)suggested high practical applicability in actual ***-static attraction,surface precipitation,and inner-sphere complexation via ligand exchange were found to be involved in selective P removal over a wide pH range of *** thermodynamic parameters were determined,which revealed the feasibility and spontaneity of *** on approximate site energy distribution analyses,high distribution frequency contributed to efficient P *** research results provide a new insight that LaFe/MB shows great application prospects for advanced phosphate removal from wastewater.

关键词： Formable porous biochar Montmorillonite Metal(hydr)oxide Wastewater phosphate removal Adsorption mechanism

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Are Wastewater Treatment Plants As The Source of Microplastics in Surface Water and Soil?

SSRN

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SSRN 2023年

作者： Wei, Haoyu Wang, Jian Pan, Suyi Ding, Hao Smith, Ken Yang, Zeyuan Liu, Jincheng Liu, Peng Guo, Xuetao Gao, Shixiang Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of Agriculture College of Natural Resources and Environment Northwest A & F University Yangling712100 China 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 State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210093 China The University of Arizona United States

Microplastics (MPs) are widely detected in wastewater treatment plants (WWTPs) and natural environment, while the relationship of MP pollution in both media is not fully understood. In this study, we investigated the occurrence of MPs in WWTPs and in surface water and soil, and critically formulated their relationship. Results showed although sewage treatment could effectively remove MPs (58.2%), the effluent is still the important source of MPs in the river, while sludge is not as important as the sewage as the source of MPs in the soil. Specifically, the dominant size ranges and type of MPs were 0-200 μm and PE detecting in all sewage, sludge, river and soil, respectively. The dominant shape of MPs in sewage and river was film. However, the shapes were different between sludge (52.1% of fibrous) and soil (40.6% of fragment). Overall, WWTP input and surface runoff were the main source of MP pollution in surface water, and the abrasion of agricultural films accounted for the MP pollution in soil. The findings revealed the distribution and interconnection of MPs in WWTPs and environmental media, which can help to trace the sources of MP pollution and assess the ecological risks in the environment. © 2023, The Authors. All rights reserved.

关键词： Microplastic

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Adverse Molecular Toxicity Induced by the Antibacterial Agent Triclosan on Freshwater Microalgae Euglena Gracilis: Perspective from the Transcriptomic and Risk Assessment

SSRN

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SSRN 2022年

作者： Lu, Ting Zhang, Tong Yang, Weishu Yang, Bin Cao, Jing Li, Mei State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China

Triclosan (TCS), a commonly used antibacterial preservative, has been demonstrated to have high toxicological potential and adversely affect the water bodies. Since algae are one of the most significant primary producers on the planet, understanding the toxicological processes of TCS is critical for determining its risk in aquatic ecosystems and managing the water environment. The physiological and transcriptome changes of Euglena gracilis were studied after 7 days of TCS treatment. A distinct inhibition ratio for the photosynthetic pigment content in E. gracilis was observed from 2.64% to 37.42% at 0.3–1.2 mg/L, with TCS inhibiting photosynthesis and growth of the algae by up to 38.62%. Superoxide dismutase and glutathione reductase significantly changed after exposure to TCS compared to the control, indicating that the cellular antioxidant defense responses were induced. Interestingly, a toxic dose-response relationship was observed, in which the growth toxic effect increased with increasing TCS concentrations from 0.6–1.2 mg/L. Based on transcriptomics, the enriched differentially expressed genes were main biological processes, involved in metabolism pathways and microbial metabolism in diverse environments. These findings establish the groundwork for future research into the molecular toxicity to microalgae induced by aquatic pollutants, as well as indicating that adequate water environment management is critical and providing fundamental data and recommendations for TCS ecological risk assessment. © 2022, The Authors. All rights reserved.

关键词： Algae

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How Fe-Bearing Materials Affect Soil Arsenic Bioavailability to Rice: A Meta-Analysis

SSRN

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SSRN 2023年

作者： Cai, Yijun Jiang, Jinlin Zhao, Xiaopeng Zhou, Dongmei Gu, Xueyuan State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China Key Laboratory of Soil Environmental Management Nanjing Institute of Environmental Sciences Nanjing210042 China

Arsenic (As) contamination is widespread in soil and poses a threat to agricultural products and human health due to its high susceptibility to absorption by rice. Fe-bearing materials (Fe-Mat) display significant potential for reducing As bioavailability in soil and bioaccumulation in rice. However, the remediation effect of various Fe-Mat is often inconsistent, and the response to diverse environmental elements is ambiguous. Here, we conducted a meta-analysis to quantitatively assess the effects of As in soils, rice roots, and grains based on 673, 321, and 305 individual observations from 67 peer-reviewed articles, respectively. On average, Fe-Mat reduced As bioavailability in soils, rice roots, and grains by 28.74%, 33.48%, and 44.61%, respectively. According to the analysis of influencing factors, the remediation efficiency of Fe-Mat on As-contaminated soil was significantly enhanced with increasing Fe content in the material, in which the industry byproduct was the most effective in soils (−42.31%) and rice roots (−44.57%), while Fe-biochar was superior in rice grains (−54.62%). The efficiency of Fe-Mat in minimizing soil As mobility was negatively correlated with soil Fe content, CEC, and pH. In addition, applying Fe-Mat in alkaline soils with higher silt, lower clay and available P was more effective in reducing As in rice grains. A higher efficiency of applying Fe-Mat under continuous flooding conditions (27.39%) compared with alternate wetting and drying conditions (23.66%) was also identified. Our results offer an important reference for the development of remediation strategies and methods for various As-contaminated paddy soils. © 2023, The Authors. All rights reserved.

关键词： Arsenic

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