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Influence of floc dynamic protection layer on alleviating ultrafiltration membrane fouling induced by humic substances

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Journal of environmental Sciences 2020年第4期32卷 10-19页

作者： Baiwen Ma Siqi Wu Bodong Wang Zenglu Qi Yaohui Bai Huijuan Liu Jiuhui Qu Ruijun Wu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085China University of Chinese Academy of Sciences Beijing100049China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi'an710055China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing100084China Research Center for Water Quality and Ecology Tsinghua UniversityBeijing100084China State Key Laboratory of Membrane Materials and Membrane Applications Tianjin Motimo Membrane Technology Co.Ltd.Tianjin300457China

Cake layer formation is inevitable over time for ultrafiltration(UF)membrane-based drinking water *** the cake layer is always considered to cause membrane fouling,it can also act as a"dynamic protection layer",as it further adsorbs pollutants and dramatically reduces their chance of getting to the membrane ***,the UF membrane fouling performance was investigated with pre-deposited loose flocs in the presence of humic acid(HA).The results showed that the floc dynamic protection layer played an important role in removing *** higher the solution pH,the more negative the floc charge,resulting in lower HA removal efficiency due to the electrostatic repulsion and large pore size of the floc *** decreasing solution pH,a positively charged floc dynamic protection layer was formed,and more HA molecules were *** potential reasons were ascribed to the smaller floc size,greater positive charge,and higher roughness of the floc ***,similar membrane fouling performance was also observed for the negative and positive floc dynamic protection layers due to their strong looseness *** addition,the molecular weight(MW)distribution of HA also played an important role in UF membrane fouling *** the small MW HA molecules,the chance of forming a loose cake layer was high with a negatively charged floc dynamic protection layer,while for the large MW HA molecules it was high with a positively charged floc dynamic protection *** a result,slight UF membrane fouling was induced.

关键词： Ultrafiltration Floc dynamic protection layer Humic substances Fouling alleviation

Characteristics of Labile Organic Carbon Fractions Under Different Types of Subsidence Waterlogging Areas in the Coal Mining Area with High Ground Water Table: A Case Study in Xinglongzhuang Coal Mine, China

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SSRN 2023年

作者： Fu, Yanhua Hu, Zhenqi Zhu, Qi Rong, Ying School of Economics and Management Tianjin Chengjian University Tianjin300384 China School of Environment Science and Spatial Informatics China University of Mining and Technology Xuzhou221116 China Chinese Research Academy of Environmental Sciences National Engineering Laboratory for Lake Pollution Control and Ecological Restoration State Environmental Protection Key Laboratory for Lake Pollution Control Beijing100012 China The Research Center of System and Industrial Technology Zhongyuan University of Technology Zhengzhou451191 China

The restoration of subsidence waterlogging areas has the potential to facilitate carbon accumulation in the coal mining areas with high ground water table. Nevertheless, the impact of restoration and management strategy on the soil organic carbon (SOC) and the labile organic carbon(LOC) have not been sufficiently demonstrated. In this study, SOC and LOC fractions, including light fraction organic carbon(LFOC), particulate organic carbon(POC), and dissolved organic carbon(DOC) within the 0-50cm profiles, were determined in the reference cropland(RC) and three types of subsidence waterlogging areas including aquaculture waterlogging area(AWA), deep waterlogging area(DWA) and shallow waterlogging area(SWA) in Xinglongzhuang Coal Mine, Shandong Province, China. Our results showed that compared with the reference cropland SOC and LOC decreased by 4.13%, 25.03%, and 77.91% in SWA, DWA, and AWA, respectively. The vital depletion was in the 0-10cm soil layer, which indicates that the recovery of total functional pools of SOC after subsidence and the succession of ecological systems takes a longer time. The liability of POC was highest among the three types of labile organic fractions which could indicate the mining subsidence triggered the soil redistribution and impact the carbon accumulation. With comparatively less interference on the soil profile, the liability of LFOC and POC decreased with soil depth, while DOC increased in DWA and SWA. And there was a large discrepancy in AWA, with the liability of LOC fractions fluctuating because of intensive engineering soil disturbance. Labile organic C fractions were closely associated and correlated with soil properties, especially TN and TP. Overall, the restoration and management have a vital impact on the soil organic carbon pool, it is suggested that shallow water, natural geomorphology-based topography, less soil disturbance, well development of vegetation communities, and continuous monitoring of soil and water properties

关键词： Subsidence

Assessment of the Binding Mechanism of Ergothioneine to Human Serum Albumin: Multi-Spectroscopy, Molecular Docking and Molecular Dynamic Simulation

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SSRN 2024年

作者： Meng, Xiaohui Xia, Zhangchen Cheng, Junwen Wang, Yanbin Ren, Xueyong He, Liang Liu, Dan Key Laboratory of State Forest Food Resources Utilization and Quality Control Zhejiang Academy of Forestry Hangzhou310023 China Zhejiang Provincial Key Laboratory of Resources Protection Innovation of Traditional Chinese Medicine Zhejiang A&F University Hangzhou311300 China National Forestry and Grassland Engineering Technology Center for Wood Resources Recycling College of Materials Science and Technology Beijing Forestry University Beijing100083 China Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province College of Biology and Environmental Engineering Zhejiang Shuren University Hangzhou310015 China

Ergothioneine (EGT) has attracted great attention due to its extremely potent antioxidant properties, universally acknowledged as ‘longevity vitamin’. In order to comprehensive understanding of its pharmacodynamics and pharmacokinetics, the binding mechanism of EGT with human serum albumin (HSA) was clarified by cutting-edged multi-spectroscopic approaches and in silico molecular docking coupled with molecular dynamic simulation. Our fluorescence quenching results revealed that the binding of EGT to HSA was in a static quenching mode validated by the descending Ksv values with temperatures increased and 1012 order of Kq. van’t Hoff criterion revealed the combination of EGT with HSA was a spontaneous exothermic process (ΔG=-24.16 kJ•mol-1) via hydrogen bonding and van der Waals force interactions (ΔH=-60.25 kJ•mol-1, ΔS=-129.44 J•mol-1•K-1) at 310 K. The analysis of UV-vis absorption spectrum, synchronous fluorescence spectrum, three-dimensional fluorescence spectrum and circular dichroism indicated the addition of EGT affected the microenvironment of Try214 and rearranged the structure of HSA. The binding replacement assay interpreted their binding site was near the subdomain IIA of HSA (Sudlow's site I), which was intuitively exhibited by molecular docking. In addition of obvious van der Wall forces, attractive charge and Pi-alkyl interactions, the chiral betaine group (N+(CH3+)3) in the side chain of EGT was inclined to form hydrogen bonds with Lys199, Ser287 and Arg257 in the hydrophobic cavity of albumin. Moreover, the dynamic simulation reinforced the equilibrium and stability of formed docking complex by four indicators (RMSD, RMSF, Rg, SASA) within 100 ns. This study has shredded insights on the elucidation of the binding behavior of EGT with HSA and paved an avenue for its deep application in the field of pharmaceuticals and cosmetics. © 2024, The Authors. All rights reserved.

关键词： Hydrogen bonds

Changes in air pollutants during the COVID-19 lockdown in Beijing:Insights from a machine-learning technique and implications for future control policy

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Atmospheric and Oceanic Science Letters 2021年第4期14卷 63-69页

作者： Jiabao Hu Yuepeng Pan Yuexin He Xiyuan Chi Qianqian Zhang Tao Song Weishou Shen Collaborative Innovation Centre of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjingChina State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina National Meteorological Center China Meteorological AdministrationBeijingChina National Satellite Meteorological Center China Meteorological AdministrationBeijingChina

The COVID-19 lockdowns led to abrupt reductions in human-related emissions worldwide and had an unintended impact on air quality ***,quantifying this impact is difficult as meteorological conditions may mask the real effect of changes in emissions on the observed concentrations of *** on the air quality and meteorological data at 35 sites in Beijing from 2015 to 2020,a machine learning technique was applied to decouple the impacts of meteorology and emissions on the concentrations of air *** results showed that the real(“deweathered”)concentrations of air pollutants(expect for O 3)dropped significantly due to lockdown *** with the scenario without lockdowns(predicted concentrations),the observed values of PM_(2.5),PM_(10),SO_(2),NO_(2),and CO during lockdowns decreased by 39.4%,50.1%,51.8%,43.1%,and 35.1%,*** addition,a significant decline for NO_(2)and CO was found at the background sites(51%and 37.8%)rather than the traffic sites(37.1%and 35.5%),which is different from the common *** the primary emissions reduced during the lockdown period,episodic haze events still occurred due to unfavorable meteorological ***,developing an optimized strategy to tackle air pollution in Beijing is essential in the future.

关键词： Random forest model Air pollutants Meteorological normalization COVID-19 Emission control strategy

A novel approach to identify the spatial characteristics of ozone-precursor sensitivity based on interpretable machine learning

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Journal of environmental Sciences 2025年

作者： Huiling He Kaihui Zhao Zibing Yuan Jin Shen Yujun Lin Shu Zhang Menglei Wang Anqi Wang Puyu Lian School of Environment and Energy South China University of Technology Guangzhou 510006 China Yunnan Key Laboratory of Meteorological Disasters and Climate Resources in the Greater Mekong Subregion Yunnan University Kunming 650091 China Key Laboratory of Regional Air Quality Monitoring Ministry of Ecology and Environment Environmental Protection Key Laboratory of Secondary Air Pollution Research Guangdong Ecological Environmental Monitoring Center Guangzhou 510308 China

To curb the worsening tropospheric ozone (O 3 ) pollution problem in China, a rapid and accurate identification of O 3 -precursor sensitivity (OPS) is a crucial prerequisite for formulating effective contingency O 3 pollution control strategies. However, currently widely-used methods, such as statistical models and numerical models, exhibit inherent limitations in identifying OPS in a timely and accurate manner. In this study, we developed a novel approach to identify OPS based on eXtreme Gradient Boosting model, Shapley additive explanation (SHAP) algorithm, and volatile organic compound (VOC) photochemical decay adjustment, using the meteorology and speciated pollutant monitoring data as the input. By comparing the difference in SHAP values between base scenario and precursor reduction scenario for nitrogen oxides (NO x ) and VOCs, OPS was divided into NO x -limited, VOCs-limited and transition regime. Using the long-lasting O 3 pollution episode in the autumn of 2022 at the Guangdong-Hong Kong-Macao Greater Bay Area (GBA) as an example, we demonstrated large spatiotemporal heterogeneities of OPS over the GBA, which were generally shifted from NO x -limited to VOCs-limited from September to October and more inclined to be VOCs-limited at the central and NO x -limited in the peripheral areas. This study developed an innovative OPS identification method by comparing the difference in SHAP value before and after precursor emission reduction. Our method enables the accurate identification of OPS in the time scale of seconds, thereby providing a state-of-the-art tool for the rapid guidance of spatial-specific O 3 control strategies.

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Four-Year Population Exposure Study: Implications for Priority-controlled E-Waste Pollutants and Characteristic Biomarkers of E-Waste Pollution

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SSRN 2022年

作者： Kuang, Hongxuan Li, Yonghong Li, Leizi Ma, Shengtao An, Taicheng Fan, Ruifang Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring Guangdong Provincial Engineering Technology Research Center for Drug and Food Biological Resources Processing and Comprehensive Utilization School of Life Sciences South China Normal University Guangzhou510631 China Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and Engineering Institute of Environmental Health and Pollution Control Guangdong University of Technology Guangzhou510006 China State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment Ministry of Ecology and Environment South China Institute of Environmental Sciences Guangzhou510655 China

E-waste pollution has emerged as a significant environmental concern, necessitating the establishment of priority-controlled e-waste pollutants and useful biomarkers that facilitate the rapid assessment of the impact of e-waste pollution on human exposure risks. Therefore, we performed a longitudinal population exposure monitoring research in an e-waste recycling area of China after e-waste control. The urinary levels of oxidative stress damage and typical pollutants emitted during e-waste recycling, including heavy metals, polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), and polychlorinated diphenyl ethers (PCDE), were continuously monitored in populations (including 275 children and 485 adults) from 2016 to 2019 using high-performance liquid chromatography-tandem mass spectrometry. After e-waste control, oxidative DNA damage levels in children decreased significantly, suggesting that scientific recycling of e-waste significantly reduced the human health burden. Although the decline of pollutants exposure level was more obvious in children than in adults, children still had higher burdens of heavy metals, VOCs and PCDE 28 exposure and oxidative stress damage than adults. Urinary tin, 1-hydroxypyrene, s -phenylmercapturic acid, and 2′-hydroxy-2,4,4′-trichlorodiphenyl ether decreased significantly and monotonically over the years were identified as the potential biomarkers of e-waste pollution. Based on the associations between pollutant exposure and oxidative stress damage levels, the top six harmful pollutants were identified as toluene, molybdenum, copper, pyrene, naphthalene, and nickel, which should be listed as the priority-controlled e-waste pollutants. Most noteworthy, toluene and naphthalene induced oxidative lipid and DNA damage without threshold, respectively. Despite the implementation of four-year e-waste management, the levels of priority-controlled pollutants in 5.26% to 92.9% of local populations were still higher than the c

关键词： Electronic Waste

Validation and Application of Diffusive Gradient in Thin-Film (Dgt) Equipped Novel Cyclodextrin Polymer Gels for monitoring Endocrine Disrupting Chemicals (Edcs) and environmental Risk Assessment in the Taihu Lake Basin

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SSRN 2022年

作者： Zhu, Xingqi Jiang, Lu Wang, Yinfeng Ji, Xiaowen Zhang, Delin Xu, Guizhou Wu, Daise Li, Aimin Xie, Xianchuan Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education School of Resources Environmental & Chemical Engineering Nanchang University Nanchang330031 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing China Jiangxi Nanxin Environmental Protection Technology Co. LTD Jiangxi Province Jiujiang330300 China Nanjing Medical University China

Taihu Lake is the most important drinking water source of the major cities in the Yangtze River Delta. The pollution of endocrine disruptors (EDCs)in Taihu Lake has been increasing recently, the accurate determination is an important guide for predicting its health risks and developing appropriate controls. monitoring organic pollutants in water using the diffusive gradient in thin film technique (DGT) has attracted much attention due to more accuracy and convenience than the grab sampling methods. In this study, a novel cyclodextrin polymer (CDP) synthesized by the simple and green method in water was taken as an adsorbent for the binding gel. Four endocrine-disrupting chemicals (EDCs), bisphenol A (BPA), 17α-ethinylestradiol (EE2), 17β-estradiol (E2), and estriol (E3), were taken as models to determine the diffusion coefficients (4.68×10-6, 3.38×10-6, 3.34×10-6 and 4.31×10-6 cm2/s) and to test the performance of DGT, such as adsorption capacity and deployment time (1-5 day). The assembled CDP-DGT was adopted to determine four EDCs in a simulated water environment (3-9 of pH, 0.001-0.5 M of ionic strength (IS), and dissolved organic matter (DOM) of 0-20 mg/L). The ability of CDP-DGT sampling was verified in the Jiuxiang River and was carried out for a large-scale field application of in situ sampling EDCs in Taihu Lake basin. The results show that the total EDCs concentration range and the estradiol equivalent concentrations (EEQ) in Taihu Lake and its main rivers are 2.78 ng/L to 11.08 ng/L and 2.62 ng/L to 10.91 ng/L, respectively. The risk quotients (RQs) of all sampling sites in the region were greater than 1, indicating that EDCs pose a serious threat to aquatic organisms in the area. Therefore, the monitoring of EDCs in the Taihu Lake basin should be further strengthened. © 2022, The Authors. All rights reserved.

关键词： Risk assessment

Continuous and comprehensive atmospheric observations in Beijing:a station to understand the complex urban atmospheric environment

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Big Earth Data 2020年第3期4卷 295-321页

作者： Yongchun Liu Chao Yan Zemin Feng Feixue Zheng Xiaolong Fan Yusheng Zhang Chang Li Ying Zhou Zhuohui Lin Yishou Guo Ying Zhang Li Ma Wenshuo Zhou Zhikun Liu Lubna Dada Kaspar Dallenbach Jenni Kontkanen Runlong Cai Tommy Chan Biwu Chu Wei Du Lei Yao Yonghong Wang Jing Cai Juha Kangasluoma Tom Kokkonen Joni Kujansuu Anton Rusanen Chenjuan Deng Yueyun Fu Rujing Yin Xiaoxiao Li Yiqun Lu Yiliang Liu Chaofan Lian Dongsen Yang Weigang Wang Maofa Ge Yuesi Wang Douglas R.Worsnop Heikki Junninen Hong He Veli-Matti Kerminen Jun Zheng Lin Wang Jingkun Jiang Tuukka Petaja Federico Bianchi Markku Kulmala Aerosol and Haze Laboratory Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijingChina Institute for Atmospheric and Earth System Research/Physics Faculty of ScienceUniversity of HelsinkiHelsinkiFinland State Key Joint Laboratory of Environment Simulation and Pollution Control State Environmental Protection Key Laboratory of Sources and Control of Air Pollution ComplexSchool of EnvironmentTsinghua UniversityBeijingChina State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijingChina Department of Environmental Science&Engineering Fudan UniversityShanghaiChina State Key Laboratory for Structural Chemistry of Unstable and Stable Species Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijingChina Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing University of Information Science&TechnologyNanjingChina State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Aerodyne Research Inc. BillericaMassachusettsUSA Institute of Physics University of TartuTartuEstonia Joint International Research Laboratory of Atmospheric and Earth System Sciences School of Atmospheric SciencesNanjing UniversityNanjingChina

Due to profound impact on climate and human health,air quality has attracted attention from all levels of the civil *** key step in the provision of required tools for the society to tackle the complex air quality problem is to characterize it in a comprehensive manner with a long-term ***,we describe a continuous and comprehensive observation station and its accompanying state-ofthe-art instrumentation that was established to investigate the complex urban atmospheric environment in a rapidly developing Chinese *** station,located in downtown Beijing,aims to study air quality by identifying the major atmospheric pollutants and key processes determining their formation and loss mechanisms.A few hundreds of parameters are continuously measured with the state-of-the-art instruments,including trace gas concentrations,aerosol particle size distributions,and mass concentrations,covering aerosol particle chemical composition from molecules to micrometer-sized aerosol *** produced long-term,comprehensive big data with around 1�10^(11)bytes per *** this paper,we provide an overview on the facilities of the station,the instrumentation used,the workflow of continuous observations and examples of results from 2018 to 2019 and a basis for establishing a modern long-term,comprehensive atmospheric urban observation station in other megacities.

关键词： Continuous and comprehensive atmospheric observation air pollution complex photochemical smog haze new particle formation

Label-Free Photocatalytic Electrochemical Biosensor for Detection of Uranyl Ions in Water

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SSRN 2023年

作者： Xiang, Mei Chen, Qiulian Zhu, Guonian Chen, Zhaoxia Li, Hailiang Hou, Xiaolin Wu, Jialun Xu, Shuxia College of Earth Sciences Chengdu University of Technology Sichuan Chengdu610059 China College of Ecology and Environment Chengdu University of Technology Sichuan Chengdu610059 China College of Material and Chemistry & Chemical Engineering Chengdu University of Technology Sichuan Chengdu610059 China Chengdu Ecological and Environmental Monitoring Center of Sichuan Province Sichuan Chengdu610066 China State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution Chengdu University of Technology Sichuan Chengdu610059 China

A label-free and DNAzyme-based photocatalytic electrochemical biosensor was developed for the detection of uranyl ions (UO22+) in water. In this sensing platform, the SYBR Green (SG) molecules that were embedded in double-stranded DNA (dsDNA), and the dsDNA was cleaved via singlet oxygen (1O2) during photosensitization, causing a significantly declined in the impedance signal of [Fe (CN)6]3-/4-. In the presence of UO22+, the substrate strand was cleaved by the target UO22+, releasing the SG molecule from the dsDNA, while its photosensitive activity was turned off. Therefore, UO22+ can be detected based on the change of [Fe (CN)6]3-/4- electrochemical signals. Such a sensing strategy allowed the detection of UO22+ in the concentration range of 1 to 1000 nM with a detection limit of 0.13 nM. The proposed sensor has been successfully applied to the detection of UO22+ in actual water samples, with recoveries ranging from 87% to 103%. The method, which combines photocatalysis with an electrochemical biosensor, significantly improved the sensitivity of UO22+ detection without the need for labeling and additional signal amplification steps, and is a promising strategy for on-site and real-time monitoring of UO22+ in environmental water samples. © 2023, The Authors. All rights reserved.

关键词： Molecules