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SSRN 2022年

作者： Huang, Lu Parsons, Chris T. Slowinski, Stephanie Van Cappellen, Philippe Ecohydrology Research Group Department of Earth and Environmental Sciences The Water Institute University of Waterloo WaterlooONN2L 3G1 Canada National Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental Sciences Ministry of Ecology and Environment No. 18 Ruihe Road Guangzhou510530 China Watershed Hydrology and Ecology Research Division Environment and Climate Change Canada 867 Lakeshore Road BurlingtonONL7S 1A1 Canada

The availability of dissolved silicon (DSi) exerts an important control on plankton communities in freshwater environments: DSi limitation can shift species dominance to non-siliceous algae and increase the likelihood of harmful algal blooms. The availability of DSi in the water column in turn depends on the dissolution kinetics of amorphous silica (ASi), including diatoms frustules and phytoliths. Here, batch dissolution experiments conducted with various sources of ASi confirmed the previously reported non-linear dependence of ASi dissolution rate on the degree of undersaturation of the aqueous solution. At least two first-order dissolution rate constants are therefore required to describe the dissolution kinetics at, respectively, high (typically, ≥ 0.55) and low (typically, © 2022, The Authors. All rights reserved.

关键词： Dissolution

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Zif-Derived Non-Bonding Co/Zn Coordinated Hollow Carbon Nitride for Enhanced Removal of Antibiotic Contaminants by Perxymonosulfate Activation: Performance and Mechanism

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SSRN 2022年

作者： Sun, Yongjun Li, Xi Wang, Shiwen Chen, Pei Xu, Baokang Zhang, Xiao Xu, Yanhua Yu, Yang Zheng, Huaili Yu, Peng Zhou, Ru School of Environmental Science and Engineering Nanjing Tech University Nanjing211816 China Key Laboratory of Industrial Pollution Control and Resource Reuse of Jiangsu Province College of Environmental Engineering Xuzhou University of Technology Xuzhou221000 China College of Safety Science and Engineering Nanjing Tech University Nanjing211816 China Graduate School at Shenzhen Tsinghua University Shenzhen518055 China Key laboratory of the Three Gorges Reservoir Region's Eco-Environment State Ministry of Education Chongqing University Chongqing400045 China College of Urban Construction Nanjing Tech University Nanjing211816 China

Co-Zn-N-C catalyst (MCZC) with neighboring Co and Zn pairs anchored on hollow carbon nitride was constructed by the direct etching of zeolitic imidazolate frameworks (ZIFs) assembled with Co and Zn. Adequate characterizations and density functional theory (DFT) studies confirmed the successful construction of non-bonding Co and Zn pairs with enhanced electron transfer on Co sites by adjacent Zn sites. Based on the synergy of adjacent Co and Zn atom pairs, the MCZC/Perxymosulfate (PMS) system achieved 99.6% Tetracycline (TC) degradation in 24 min with a mineralization rate of 55.8% and PMS decomposition efficiency of 73.1%. DFT calculation based on the Fukui index identified the sites susceptible to attack by the active species. TC degradation pathways could be inferred, and reduced toxicity of intermediates was observed. This work provides new insights into the design of MOF-derived bimetallic catalysts and the importance of the interaction between adjacent metal active sites to catalytic performance. © 2022, The Authors. All rights reserved.

关键词： Chemical activation

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Pilot-scale experiments on multilevel contact oxidation treatment of poultry farm wastewater using saran lock carriers under different operation model

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Journal of environmental Sciences 2019年第3期31卷 336-345页

作者： Tianlong Zheng Peng Li Xiaoyu Ma Xiaohong Sun Chuanfu Wu Qunhui Wang Ming Gao State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Department of Environmental Engineering University of Science and Technology Beijing Xinkai Water Environmental Investment Co.Ltd Beijing Agro-Biotechnology Research Center Beijing Academy of Agriculture and Forestry Sciences

A pilot-scale multilevel contact oxidation reactors system, coupled with saran lock carriers,was applied for the treatment of poultry farm wastewater. The removal efficiencies of CODcr, ammonia, and the total nitrogen as well as the elimination performance of CODcr and total nitrogen along the three-level contact oxidation tanks under six designed operational models were investigated. Based on the performance of the nitrogen removal of the saran lock carriers and the distribution of anoxic–aerobic interspace under the suitable operation model, the mechanism of nitrogen removal of the system was also explored. The results revealed that the intermittent aeration under parallel model is the most suitable operation model, while the removal efficiencies of CODcr, ammonia, and the total nitrogen were 86.86%, 84.04%, and 80.96%, respectively. The effluent concentration of CODcr,ammonia, and the total nitrogen were 55.6 mg/L, 8.3 mg/L, and 12.0 mg/L, which satisfy both the discharge standard of pollutants for livestock and poultry breeding industry(GB18596–2001) and the first grade of the integrated wastewater discharge standard(GB 8978–1996). Moreover, the mechanism for the nitrogen removal should be attributed to the plenty of anoxic–aerobic interspaces of the biofilm and the three-dimensional spiral structure of the saran lock carriers, where the oxygen-deficient distribution was suitable for the happening of the simultaneous nitrification and denitrification process. Therefore, the multilevel contact oxidation tanks system is an effective pathway for the treatment of the poultry farm wastewater on the strength of a suitable operation model and novel carriers.

关键词： Multilevel contact oxidation tanks Nitrogen removal Mechanism Operation model Poultry farm wastewater Saran lock carriers

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The Design of the Highly Active Nh3-Scr Catalyst Ce-W/Uio-66: Close Coupling of Active Sites and Acidic Sites

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SSRN 2022年

作者： Wang, Fei Wang, Chunxue Zhao, Ke Shan, Yulong Ma, Yixing Wang, Chi Sun, Xin Li, Kai He, Hong Ning, Ping Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming650500 China National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming650500 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Faculty of Chemical Engineering Kunming University of Science and Technology Kunming650500 China Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China University of Chinese Academy of Sciences Beijing100049 China

Ce based catalyst is one of the most important NH3-SCR catalysts. It has been widely recognized that Ce3+ plays a crucial role in NH3-SCR reaction. However, the specific atomic sites for anchoring Ce atoms and the chemical mechanism underlying the formation of Ce3+ in CeO2 are still incompletely known. Herein, we demonstrate that there are abundant hydroxyl groups on the surface of UiO-66, which are the anchoring sites of Ce. As the loading continues to increase, the insufficiently anchored Ce species will agglomerate and induce the formation of Ce3+-rich CeO2 clusters, which served as the redox sites in 10%Ce/UiO-66. On this basis, the strong interaction between W and CeO2 was used to introduce highly dispersed acidic sites (WO3) around CeO2, and thus the redox site and the acidic site are tightly coupled. In situ DRIFTS results revealed that the NH3-SCR reaction pathway followed L-H mechanism on 10%Ce-10%W/UiO-66 catalyst, which is likely to be an important factor for the improved catalytic activity and stability. © 2022, The Authors. All rights reserved.

关键词： Catalyst activity

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pollution-free recycling of lead and sulfur from spent lead-acid batteries via a facile vacuum roasting route

Green Energy and Resources

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Green Energy and Resources 2023年第1期1卷

作者： Wang, Mengmeng Tan, Quanyin Yu, Jiadong Xia, Dong Zhang, Wei Zhang, Cong-Cong Zhang, Zhiyuan Wang, Junxiong Liu, Kang Li, Jinhui State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China SCARCE Laboratory Energy Research Institute @ NTU (ERI@N) Nanyang Technological University Singapore 637459 Singapore School of Ecology and Environment Zhengzhou University 100 Kexue Avenue Henan Zhengzhou 450001 China Department of Solid Waste Treatment and Recycling Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Hong Kong Kowloon China School of Finance and Economics Qinghai University Xining 810000 China

Traditional pyrometallurgical recovery of spent lead-acid batteries (LABs) requires a temperature higher than 1000 °C, with accompanying hard-to-collect wastes such as lead dust and sulfur oxides. Against this background, sodium carbonate (Na₂CO₃) was proposed as a low-cost, safe, and non-toxic reagent for recycling the high-risk environmental elements lead (Pb) and sulfur (S), in spent LAB lead paste, enabling the one-step conservation of multi-component Pb species, including lead sulfate (PbSO₄), metallic lead (Pb), and lead dioxide (PbO₂), to lead oxide (PbO) and sodium sulfate (Na₂SO₄). The possible reaction pathways of Pb and S species in vacuum roasting was confirmed by Gibbs free energy reaction with an estimated average activation energy of 272.5 kJ/mol. The insoluble PbO in the reaction product (PbO/Na₂SO₄/Na₂CO₃) can be recycled by vacuum filtration, while Na₂CO₃ and Na₂SO₄ were separated using a carbonation method. Life cycle assessment revealed that for recycling 1.0 t of spent LABs, the vacuum roasting can reduce the carbon footprint −2.1 × 10³ kg CO₂ eq, promoting global decarbonization. The designed route is highlighted with waste-free production and is outlined by the twelve principles of green chemistry, showing its great engineering application potential for spent LAB recycling. © 2023 The Authors

关键词： Lead oxide Lead recovery Spent lead-acid battery Sulfur recovery Vacuum roasting

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Associations of PM2.5 composition and green space with metabolic syndrome in a Chinese essential hypertensive population

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Chemosphere 2023年 343卷

作者： Xiao, Ya Liu, Ce Lei, Ruoyi Wang, Zengwu Wang, Xin Tian, Hezhong Xue, Baode Zhou, Erkai Zhang, Kai Hu, Jihong Luo, Bin Institute of Occupational Health and Environmental Health School of Public Health Lanzhou University Gansu Lanzhou730000 China Division of Prevention and Community Health National Center for Cardiovascular Disease Fuwai Hospital Peking Union Medical College & Chinese Academy of Medical Sciences Beijing100037 China State Key Joint Laboratory of Environmental Simulation & Pollution Control School of Environment Beijing Normal University Beijing100875 China Department of Environmental Health Sciences School of Public Health University at Albany State University of New York One University Place RensselaerNY12144 United States School of Public Health Gansu University of Chinese Medicine Gansu Lanzhou730000 China

Background: Metabolic syndrome (MetS) has emerged as a significant global public health concern. While environmental factors, including PM2.5, have been identified as important risk factors for MetS in the general population, limited studies have investigated their impact on individuals with essential hypertension. Therefore, our study aims to explore the relationship between PM2.5 composition, green space, and their combined effects on MetS among a Chinese essential hypertensive population. Method: A total of 20,131 participants diagnosed with essential hypertension from 10 provinces in China were included in this study. Individual level exposure to various environmental factors (including PM2.5, PM2.5 composition, green space and temperature) were evaluated using spatiotemporal models based on satellites data. Participants were defined as MetS according to the definition issued by the International Diabetes Federation. Generalized additive mixed models were used to analyze the individual air pollutants, green space and their interaction on MetS. Result: The prevalence of MetS in this population was 44.33%. The adjusted odd ratio (OR) of MetS, with each one unit increase in SO42−, BC and NO3− were 1.077 (1.049, 1.106), 1.126 (1.077, 1.177) and 0.977 (0.958, 0.996) respectively. Additionally, each unit increase of the Normalized Difference Vegetation Index (NDVI) was associated with a decreased risk of MetS (OR: 0.988, 95% CI: 0.984–0.993). In particular, green space was found to mitigate the adverse impacts of PM2.5 on MetS (OR: 0.988, 95% CI: 0.984–0.993). Conclusion: Our results suggested that there was a positive association between PM2.5 and its composition (SO42−, BC) with MetS in the essential hypertensive population, while green space might play a protective role. Moreover, green space could effectively weaken the positive relationship between air pollutants and MetS, especially in males and participants younger than 60 years old. © 2023

关键词： Metabolism

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大型膜生物反应器在中国工业废水处理中的应用——技术经济特征、驱动力和展望

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Engineering 2021年第6期7卷 358-385页

作者：张姣肖康刘紫微高庭苇梁帅黄霞 State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Research and Application Center for Membrane Technology School of Environment Tsinghua University College of Resources and Environment University of Chinese Academy of Sciences College of Environmental Science and Engineering Beijing Forestry University

膜生物反应器(membrane bioreactor, MBR)在中国工业废水处理和回收利用领域发挥了持续性重要作用。MBR技术在其成熟应用阶段的可持续发展有赖于工程和科研双方的互惠互动。本研究针对2003—2019年投入运营和在建的共计182座处理工业废... 详细信息

膜生物反应器(membrane bioreactor, MBR)在中国工业废水处理和回收利用领域发挥了持续性重要作用。MBR技术在其成熟应用阶段的可持续发展有赖于工程和科研双方的互惠互动。本研究针对2003—2019年投入运营和在建的共计182座处理工业废水的大型MBR工程(单体规模≥5000 m~3·d-1)进行了全面分析。随着MBR在各工业行业中的推广应用,累积处理规模迅速增长,超大型MBR工程在近期也得到快速发展。依据不同工业废水的特点,对处理工艺、污染物去除效率和实际运行参数进行了归纳,并与城镇污水处理进行了比较;在经济特征方面,对项目总投资、总占地面积、运行能耗等进行了分析。随着膜元件供应商和工程商的快速发展、政府项目不断增加,以及新型灵活的商业模式的发展,中国已形成一个充满活力的MBR市场。MBR技术目前多应用于各大经济带和缺水地区。考虑到工业废水处理和回收利用的巨大市场,可以预见未来MBR在中国各地的进一步推广应用。政策—经济和市场—技术两方面的驱动力表明MBR的发展与国家发展需求一致。为保持MBR的竞争力,本文基于调研和分析结果,对其在工程应用和科学研发两方面的发展进行了展望。

关键词：工程应用处理规模运行参数占地面积地理分布政策

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Navigable flow condition simulation based on two-dimensional hydrodynamic parallel model

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Journal of Hydrodynamics 2018年第4期30卷 632-641页

作者：张尚弘吴昱荆柱易雨君 Renewable Energy School North China Electric Power University State Key Laboratory of Water Environment Simulation and Pollution Control School of Environment Beijing Normal University

Navigable flow condition simulations can provide detailed information on water depth and velocity distribution, simulation speed is one of the key factors which influence real-time navigation. In this paper, a navigable flow condition simulation system is developed to provide useful information for waterway management and shipping safety. To improve the simulation speed of 2-D hydrodynamic model, an explicit finite volume method and Open MP are used to realize parallel computing. Two mesh schemes and two computing platforms are adopted to study the parallel model＇s performance in the Yangtze River, China. The results show that the parallel model achieves dramatic acceleration, with a maximum speedup ratio of 34.94？. The parallel model can determine the flow state of the navigable channel in about 4 min, efficiency is further improved by a flow simulation scheme database. The developed system can provide early warning information for shipping safety, allowing ships to choose better routes and navigation areas according to real-time navigable flow conditions.

关键词： 2-D hydrodynamic model finite volume method parallel computation OpenMP navigable flow condition

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Reduction of wastewater toxicity and change of microbial community in a hydrolysis acidification reactor pre-treating trimethylolpropane wastewater

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Frontiers of environmental Science & Engineering 2018年第6期12卷 119-131页

作者： Xin Xing Yin Yu Hongbo Xi Guangqing Song Yajiao Wang Jiane Zuo Yuexi Zhou State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Research Center of Water Pollution Control Technology Chinese Research Academy of Environmental SciencesBeijing 100012China

Trimethylolpropane (TMP) wastewater is one of the most toxic petrochemical wastewater. Toxicants with high concentrations in TMP wastewater often inhibit the activity of microorganisms associated with biological treatment processes. The hydrolysis acidification process (HAP) is widely used to pretreat petrochemical wastewater. However, the effects of HAP on the reduction of wastewater toxicity and the relevant underlying mechanisms have rarely been reported. In this study, an HAP reactor was operated for 240 days, fed with actual TMP wastewater diluted by tap water in varying ratios. The toxicity of TMP wastewater was assessed with the inhibition ratio of oxygen uptake rate. When the organic loading rates were lower than 7.5 kg COD/m3/d, the toxicity of TMP wastewater was completely eliminated. When the actual TMP wastewater was directly fed into the reactor, the toxicity of TMP wastewater decreased from 100% to 34.9%. According to the results of gas chromatographymass spectrometry analysis, four main toxicants contained in TMP wastewater, namely, formaldehyde, 2-ethylacrolein, TMP and 2-ethylhexanol, were all significantly removed, with removal efficiencies of 93.42%, 95.42%, 72.85% and 98.94%, respectively. Compared with the removal efficiency of CODCr, the reduction rate of toxicity is markedly higher by HAP. In addition, the change of microbial community in the HAP reactor, along the operation period, was studied. The results revealed that, compared with the seed sludge, Firmicutes became the dominant phylum (abundance increased from 0.51% to 57.08%), followed by Proteobacteria and Bacteroidetes (abundance increased from 59.75% to 25.99% and from 4.70% to 8.39%, respectively).

关键词： Trimethylolpropane wastewater Hydrolysis acidification process Toxicity Oxygen uptake rate 16S rDNA

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Diagnosis of sewer pipe defects on image recognition of multi-features and support vector machine in a southern Chinese city

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Frontiers of environmental Science & Engineering 2019年第2期13卷 29-41页

作者： Xiangyang Ye Jian’e Zuo Ruohan Li Yajiao Wang Lili Gan Zhonghan Yu Xiaoqing Hu State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Thunip Corp. Ltd.27F/Section CS&T BuildingTsinghua S&T ParkBeijing 100084China China Water Environment Group.10F Campbell Building89th Jinbao StreetBeijing 101101China

Closed circuit television(CCTV)systems are widely used to inspect sewer pipe *** the diagnosis process,the manual diagnosis of defects is time consuming,labor intensive and error *** assist inspectors in diagnosing sewer pipe defects on CCTV inspection images,this paper presents an image recognition algorithm that applies features extraction and machine learning *** algorithm of image recognition techniques,including Hu invariant moment,texture features,lateral Fourier transform and Daubechies(DBn)wavelet transform,was used to describe the features of defects,and support vector machines were used to classify sewer pipe *** to the inspection results,seven defects were defined;the diagnostic system was applied to a sewer pipe system in a southern city of China,and 28,760 m of sewer pipes were *** results revealed that the classification accuracies of the different defects ranged from 51.6% to 99.3%.The overall accuracy reached 84.1%.The diagnosing accuracy depended on the number of the training samples,and four fitting curves were applied to fit the *** to this paper,the logarithmic fitting curve presents the highest coefficient of determination of 0.882,and more than 200 images need to be used for training samples to guarantee the accuracy higher than 85%.

关键词： Sewer pipe defects Defect diagnosing Image recognition Multi-features extraction Support vector machine

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