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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

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

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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

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

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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

Frontiers and Innovative Development of Metallurgical Engineering Science and Technology in China Toward 2040

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Strategic Study of CAE 2024年第5期26卷 24-36页

作者： Chai, Liyuan Wang, Haiying Min, Xiaobo Liu, Hui Wang, Qingwei Gu, Huangling School of Metallurgy and Environment Central South University Changsha410083 China State Key Laboratory of Advanced Metallurgy for Non-ferrous Metals Changsha410083 China Chinese National Engineering Research Centre for Control & Treatment of Heavy Metal Pollution Changsha410083 China

Promoting the low-carbon and intelligent development of the metallurgical industry and establishing a low-carbon metallurgical industry system are crucial for ensuring national metal resource and energy security, strengthening the manufacturing sector, and supporting carbon reduction and ecological construction in China. Based on a global perspective, the metallurgical industry of China is still at a stage of low-end manufacturing. Therefore, it is necessary to conduct the top-level design to boost China’s strength in metallurgical development, integrating the independent control of metal resources, intelligent manufacturing, environmental protection, and national security maintenance as an organic whole. This study summarizes the frontiers and development trends of metallurgical engineering science and technology worldwide, analyzes the development vision of metallurgical engineering science and technology in China, and proposes medium- and long-term strategic measures for China’s metallurgical engineering technology development toward 2040, involving general development ideas, key strategic tasks, and main technology development directions. Furthermore, the following countermeasures are proposed: (1) developing disruptive technologies in the metallurgical field in advance, (2) integrating the industrial and innovation chains of the metallurgical industry, (3) building a sophisticated talent system, (4) improving the policy and standards systems, and (5) constructing driving forces for core technology development. © 2024 Beijing Zhongguo Gongcheng Kexue Zazhishe. All rights reserved.

关键词： Pyrometallurgy

Synergistic effects of tree-herb intercropping on the phytoremediation efficiency of cadmium and lead contaminated soil

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Science of the Total environment 2024年 954卷 176709页

作者： Zhang, Chentao Zha, Yidi Guang, Penghong Ai, Fuxun Yin, Ying Guo, Hongyan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Joint International Research Centre for Critical Zone Science-University of Leeds and Nanjing University Nanjing University Nanjing210023 China

Tree-herb intercropping has emerged as an effective strategy for the remediation of soil contamination. In this study, the effects of intercropping willow with herbaceous plants Lolium perenne L., Iris lactea Pall. and Bidens pilosa L. were investigated on the phytoremediation of Cd- and Pb-contaminated soil. After a 90-day of cultivation, the results showed that intercropping stimulated the phytoremediation efficiency through increased metal accumulation in plants. Intercropping caused a significant (p © 2024 Elsevier B.V.

关键词： Soil pollution

The Significant Influence of Pre-Oxidation with Potassium Permanganate on Coagulation of Humic Acid and its Membrane Fouling Behavior

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SSRN 2023年

作者： Yang, Min Li, Kun Wang, Tianyu Liu, Ruiping Hu, Chengzhi Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China

In this study, we systematically explore coagulation behavior, ultrafiltration membrane fouling behavior and the mechanism involved in for weak acid, neutral and alkaline condition, respectively, during the process of pre-oxidation of potassium permanganate and coagulation of aluminum chloride to remove humic acid (HA). The KMnO4 pre-oxidation significantly enhances flocs formation, and the flocs size increases from 82 to 122μm at pH 5.5, from 63 to 185μm at pH 7.0 and from 0 to 75μm at pH 8.5, respectively. Pre-oxidation could efficiently convert macromolecule HA to small molecule, and HA between 3kDa and 30kDa has the fastest reaction rate with KMnO4, then comes HA over 30kDa, and the HA under 3kDa has the slowest reaction rate. The enhanced coagulation at pH 5.5 is attributed to the aluminum speciation change after pre-oxidation along with the generated Mn2+ damaging the electric double layer structure. And for pH 8.5 it is mainly caused by the in-situ MnO2 as combination nuclei during pre-oxidation. Besides, for pH 7.0, the combined effect of in-situ MnO2 and aluminum speciation change both contribute to improvement of the coagulation. What’s more, the enhanced Al coagulation by pre-oxidation of KMnO4 also helps alleviate the membrane fouling, and a much rougher surface with larger flocs forms after KMnO4-aided Al coagulation humic acid filtration. This study provides an alternative perspective on the mechanism of pre-oxidation coagulation process. © 2023, The Authors. All rights reserved.

关键词： Coagulation

Cufe2o4@Ncnts-Functionalized Ceramic Microfiltration Membrane for Antibiotic Oxidation and Fouling control Via Heterogeneous Electro-Fenton Reaction

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SSRN 2024年

作者： Zhang, Zixin Huang, Guohe Li, Yongping Yao, Yao Zhang, Peng Chen, Xiujuan Ren, Shaojie Luo, Yifei Zhang, Yuanzheng State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing100875 China 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 Beijing100875 China Environmental Systems Engineering Program University of Regina ReginaSKS4S 0A2 Canada Institute for Energy Environment and Sustainable Communities University of Regina ReginaS4S 0A2 Canada Department of Civil Engineering The University of Texas at Arlington ArlingtonTX United States Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao266237 China College of Environmental Science and Engineering North China Electric Power University Beijing102206 China

Herein, we reported an electrocatalytic ceramic microfiltration membrane functionalized with CuFe2O4 nanoparticles supported by nitrogen-doped carbon nanotubes (NCNTs). The synergistic catalysis between Fe and Cu induced a continuous ·OH generation. The active Fe(II) and Cu(I) sites decomposed the in-situ generated H2O2 into ·OH. The electron transfer from the external circuit and Cu(I) to Fe(III) drove the regeneration of Fe(II). The interfacial electron transfer from CuFe2O4 to NCNTs decreased the electron density of Fe and Cu, thus facilitating the redox cycles of Fe(III)/Fe(II) and Cu(II)/Cu(I). Furthermore, the Fe and Cu sites at the interface of CuFe2O4 and NCNTs displayed a superior ability to non-interface sites in producing ·OH. At near-neutral pH, the electrocatalytic membrane delivered excellent tetracycline removal kinetics (0.0134 min-1) and significantly alleviated the organic fouling occurring on the membrane. These findings shed new light on the development of new-generation membranes with catalytic oxidation capabilities for water treatment. © 2024, The Authors. All rights reserved.

关键词： Antibiotics

CRWS-mountain Project:Coordinate remediation techniques and devices for water-soil pollution in mountain areas in China

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Journal of Mountain Science 2021年第9期18卷 2441-2446页

作者： SONG Ling LI Lei ZHANG Chao-jie HUANG Li GUO Jin-song ZHU Bo ZHOU Ming-hua Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment College of Environment and EcologyChongqing UniversityChongqing 400030China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River) Ministry of Agriculture and Rural AffairsHuazhong Agricultural UniversityWuhan 430070China

Rural environmental governance is an important strategy to achieve the goal of building"green liveable villages"in ***,studies on technology and devices for pollution remediation focus mainly on urban areas;in this regard,few studies have focused on rural areas,especially mountainous or hilly areas with *** remediation techniques and devices for water-soil restoration in mountain areas(CRWS-mountain),a subproject of the"environmental monitoring and remediation in rural areas"project(ERM-rural project),was undertaken to develop techniques and devices for coordinating the restoration of water and soil in rural mountainous and hilly areas with *** CRWS-mountain project will attempt to explore the mechanisms of pollutant transportation and transformation in the interflow-soil-surface water system,establish in-situ and heterotopic remediation systems in landfill,towns and surrounding areas,and construct a comprehensive system for"polluted soilinterflow-surface water"by integrating all the technologies and devices at Yanting,a typical rural mountainous hilly area in Sichuan,Southwest *** expect that after using this comprehensive system,the water quality will meet the requirements for local water function *** operation cost is 10%lower than that of the existing urban equipment.

关键词： Coordinate remediation Interflow Drywet alteration Rural

Can Raising environmental Tax Reduce pollution? Firm-Level Evidence from China

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SSRN 2022年

作者： Zhang, Yue Xia, Fan Zhang, Bing State Key Laboratory of Pollution Control & Resource Reuse School of Environment Nanjing University Nanjing210023 China

Using China’s environmental tax reform in 2018 as a quasi-natural experiment, this paper identifies the effect of raising tax rates on reducing pollution based on micro-level data of over 19 thousand firms nationwide. We estimate that for every unit of tax rate increase, the discharge concentrations of water pollutants, Chemical Oxygen Demand (COD) and Ammonia Nitrogen (NH 3 -N), have significantly decreased by 1.37% and 1.51%, and the emissions have decreased by 8.79% and 2.81%. Firms with a high emission intensity reduce their emissions more than firms with a low emission intensity. We also find that state-owned enterprises, relative to private firms, are less responsive to the tax increase in terms of emission behaviors. Our findings provide evidence that the raised environmental tax has contributed to significant reductions in firm emissions in China, which implies that previous tax rates are below the marginal abatement cost on average. © 2022, The Authors. All rights reserved.

关键词： Water pollution

Effects of a Redox-Active Diketone On the Photochemical Transformation of Roxarsone: Mechanisms and environmental Implications

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SSRN 2022年

作者： Wei, Shuangshuang Zhou, Chang Zhang, Guoyang Zheng, Hongcen Chen, Zhihao Zhang, Shujuan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Organoarsenics pose a severe threat to the environment and human health. In aquatic environment, dissolved organic matter (DOM)-mediated photochemical transformation is one of the main processes in the fate of variant pollutants, including organoarsenics. Dicarbonyl is a typical redox-active moiety in DOM. However, the knowledge on the photoconversion of organoarsenics by DOM, especially the contributions of dicarbonyl moieties is still limited. Here, we systematically investigated the photochemical transformation of three organoarsenics with the simplest β-diketone, acetylacetone (AcAc), as a model dicarbonyl moiety of DOM. The results demonstrate that AcAc was a potent photo-activator and oxygen-depleting agent, which could significantly enhance the photochemical transformation of roxarsone (ROX). At a 1:1 molar ratio of AcAc to ROX, the photochemical transformation rate of ROX was increased by 7 folds. In O2-rich environment, singlet oxygen, peroxide radicals, and ·OH were the main reactive species that led to the breakage of the C-As bond in ROX and the oxidation of the released arsono group to arsenate, whereas the triplet-excited state of AcAc (3AcAc*) and carbon-centered radicals from the photolysis of AcAc dominated in the reductive transformation of ROX. In anoxic environment, 3-amino-4-hydroxyphenylarsonic acid was one of the main reductive transformation intermediates of ROX, whose photolysis rate was about 35 times that of ROX. The knowledge obtained here is of great significance to better understand the fate of organoarsenics in natural environment. © 2022, The Authors. All rights reserved.

关键词： Dissolved oxygen