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Unveiling Distinct Influencing Mechanisms of Br- on Ndma Formation During Ozonation of Actual Water Matrixes: Identification of Precursors and Brominated Substance

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SSRN 2024年

作者： Gao, Menglan Liao, Xiaobin Chen, Shuting Li, Xiaoying Zhang, Yirou Chen, Chao Qi, Huan Institute of Municipal and Environmental Engineering College of Civil Engineering Huaqiao University Fujian361021 China College of Textiles and Apparel Quanzhou Normal University Fujian362002 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Bromide ion (Br-) in water sources has been found to affect the formation of carcinogenic non-brominated N-nitrosodimethylamine (NDMA) during ozonation of typical amines. The increasing bromide levels bring more concern due to climate change and industrial discharge, but its effects on actual water matrixes were still unclear. In this study, the effects of Br- on NDMA formation from three actual water matrixes were investigated (promotion, promotion then inhibition, and subtle influence);from which the NDMA precursors were screened and some were selected for exploring the influencing mechanisms. The results indicated that the roles of Br- on NDMA formation significantly depended on the water characteristics of actual matrixes. A total of 16 typical NDMA precursors, which were mainly derived from industrial, agricultural and pharmaceutical sources, were identified. Moreover, six brominated substance (Br-DMA, Br-UDMH, Br-DMSC, Br-DMS, Br-TMDS, Br2-TMDS), which were thought to play a crucial role in promoting NDMA formation, were also identified in actual water by precursor ion scan (PIS) method. Hypobromous acid (HOBr), which has been proved to be the culprit to the generation of brominated substances, tend to attack the electron-donating groups of amines, such as acylamino (-NHCO-R) or amidogen (-NH2) groups. However, the reactive bromine species (∙Br and ∙Br2-) was inclined to attack the aromatic and antioxidant moieties to produce Br-, as no bromine substitution but free radical transfer reaction occurs. Therefore, decreasing HOBr formation is the crucial step to reduce NDMA generation. This work would provide technical guide for NDMA risks control during ozonation of Br-amines co-containing water matrixes. © 2024, The Authors. All rights reserved.

关键词： Amines

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Driving Factors of Aerosol Ph Changes in Four Cities in Northern China During the 2022 Winter Olympics

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SSRN 2024年

作者： Zhu, Hongji Zhang, Xiang Liu, Yafei Chen, Jing Liu, Lianyou Hou, Dongli Liu, Xingang Yang, Yuanle Jiang, Jiongjiong State Key Joint Laboratory of Environmental Simulation & Pollution Control School of Environment Beijing Normal University Beijing100875 China Ecology Environment Monitoring Center of Hebei Province Shijiazhuang050000 China Jining Ecological Environment Affairs Center Jining272000 China Jining Ecological Environment Monitoring Center Jining272100 China Key Laboratory of Environmental Change and Natural Disaster Ministry of Education Beijing Normal University Beijing100875 China

Aerosol acidity (pH) plays a key factor in regulating aerosol composition;therefore, understanding the driving factors of aerosol pH is critical. In this study, the characteristics and driving factors of aerosol pH changes during different control periods during the 2022 Winter Olympics in four cities (Zhangjiakou, Baoding, Shijiazhuang, and Handan) in northern China, which were calculated via the ISORROPIA model, were studied on the basis of the observed air pollutants. The factors influencing the gas‒aerosol distribution of aerosol semivolatile components were explored. During the Winter Olympics, the aerosol pH in the four cities was between 2.75 and 4.66, which was weakly acidic. The aerosol pH in the four cities mostly peaked during the light-control period. control measures had a substantial effect on the concentration of gaseous precursors, and changes in sulfate, nitrate, and ammonium were the dominant driving factors for changes in aerosol pH during different periods. Ca2+ caused by dust was an important driving factor for the change in aerosol pH in Baoding. In the four cities, the temperature increased about 9°C from the strict-control period to the light-control period, and relative humidity increased about 15% from the light-control period to the noncontrol period. Therefore, temperature and relative humidity are also crucial driving factors of changes in aerosol pH. The pH, temperature, and aerosol liquid water content play important roles in the gas‒aerosol distribution of semivolatile components. This research can further elucidate the relationships among aerosol composition, aerosol pH, and meteorological factors, providing a scientific basis for formulating more effective aerosol control strategies. © 2024, The Authors. All rights reserved.

关键词： pH effects

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Accumulation Kinetics of Polystyrene Nano- and Microplastics in the Waterflea Daphnia Magnaand Trophic Transfer to the Mysid Limnomysis Benedeni

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SSRN 2024年

作者： Yu, Qi Nederstigt, Tom A.P. Wang, Zhuang Wu, Juan Bosker, Thijs Peijnenburg, Willie J.G.M. Vijver, Martina G. State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental Science Ministry of Ecology and Environment Guangzhou510535 China Leiden University Leiden2300 RA Netherlands School of Environmental Science and Engineering Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing University of Information Science and Technology Nanjing210044 China Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province Zhejiang University of Technology Hangzhou310014 China Bilthoven3720 BA Netherlands

Trophic transfer of nano- and microplastics (NMPs) within food webs is poorly understood. Here we investigated the accumulation of differently sized polystyrene particles (PSPs) in Daphnia magna and their subsequent transfer to Limnomysis benedeni, explicitly accounting for the fate of the PSPs in the aquatic system as a function of particle size (26, 500 and 4800 nm). L. benedeni were fed D. magna exposed to 8 mg/L PSPs for 16 h and were subsequently depurated for 48 h in the absence of food. On the basis of the mass of particles accumulated in the organisms, the internal concentration of 4800 nm PSPs was found to be 4 -10 times higher than that of 26 and 500 nm PSPs in D. magna. Uptake rate constants in daphnids for 26 nm (1.7 ± 0.4 L/g·h) and 4800 nm (1.7 ± 0.4 L/g·h) were significantly (p © 2024, The Authors. All rights reserved.

关键词： Rate constants

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Corrigendum to Metagenomic insights into the profile of antibiotic resistomes in sediments of aquaculture wastewater treatment system

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Journal of environmental Sciences 2023年第4期126卷 836-836页

作者： Jianfei Chen Yuyin Yang Xinshu Jiang Yanchu Ke Tao He Shuguang Xie State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China State Key Joint Laboratory of Environment Simulation and Pollution Control(SKJLESPC) Beijing Key Laboratory for Emerging Organic Contaminants Control(BKLEOC)School of EnvironmentPOPs Research CenterTsinghua UniversityBeijing 100084China South China Institute of Environmental Sciences(SCIES) Ministry of Ecology and Environment(MEE)Guangzhou 510655China

The authors regret<We found an error in Eq.(2)of ***.,2022,113,345-355(Ncell was obtained from the calculation of ARGs-OAP software,so it doesn’t affect the subsequent results).Eq.(2)is revised as follows(Yang et ... 详细信息

The authors regret

关键词： wastewater treatment revised

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One representative water supply system in China with nitrosamine concern: Challenges and treatment strategies

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Journal of environmental Sciences 2020年第2期32卷 12-20页

作者： Yu Qiu Er Bei Yufang Wang Jun Wang Xiaojian Zhang Chao Chen State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China Research Institute for Environmental Innovation(Suzhou) TsinghuaSuzhou 215163China

Four sampling campaigns were conducted in two years to understand the fluctuation of N-Nitrosamines(NAs) and their precursors in one drinking water treatment plant(DWTP) in East China in different *** water supply system has been facing several nitrosamine challenges related with source water, including the switch of water source,high concentration of ammonium, formed NAs and NA formation potential(FP) in source ***, the use of ozonation in the DWTP and chloramination in networks will increase the NDMA concentration in tap *** address these challenges, the biopretreatment was applied in this DWTP to decrease the concentration of ammonium and *** following biological activated carbon(BAC) will neutralize the nitrosamine increase brought by *** use of free chlorine in disinfection process will also decrease the NDMA formation compared with *** results will benefit other cities in China and other countries with similar impacted water sources.

关键词： Drinking water treatment plant Formation potential Networks N-Nitrosamines Precursor

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In Situ Microplastic Sers Sensor Based on Flexible AU Tapes

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SSRN 2024年

作者： Sun, Zhenli Hong, Zijin Zhang, Yiyan Xie, Dan Duan, Fengkui Du, Jingjing MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and Engineering North China Electric Power University Beijing102206 China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

A B S T R A C TMicroplastic analysis is crucial for human health. Thus far, research has primarily focused on investigating microplastics within aqueous environments, while in situ techniques for detecting microplastic particles in the atmosphere remain scarce. Herein, we introduce an innovative flexible sensor for the in-situ detection of microplastics in the atmosphere, using surface-enhanced Raman scattering (SERS) effects. Our sensor, composed of Au nanoparticle (AuNP) tapes fabricated via a novel "drop-coating and peel-off" method, demonstrates outstanding SERS performance. The size, morphology, and electromagnetic field enhancement of the AuNP tape were thoroughly characterized using multiple complementary techniques, including scanning electron microscopy, transmission electron microscopy, UV–vis spectroscopy, atomic force microscopy, and the finite-difference time-domain method. Owing to its exceptional transparency and sensitivity, the AuNP tape facilitates the reliable identification of multi-component microplastics in the atmospheric environment. This study bridges a critical gap in microplastic research and enhances our understanding of microplastic pollution. © 2024, The Authors. All rights reserved.

关键词： Scanning electron microscopy

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Continuous Adsorption Removal of Trace Lead from Drinking Water in a Functionalized Activated Carbon Fibers Fixed Bed Column

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SSRN 2024年

作者： Zuo, Qi Zheng, Hong Zhang, Pengyi Zhang, Yu Zhang, Jiejing Zhang, Baichao Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences Beijing100083 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Functionalized activated carbon fibers (ACFs) have good application prospects for eliminating trace heavy metals ions from water. Continuous removal in a fixed bed is preferred and supposed industrially feasible for the elimination of various pollutants in comparison to batch operation. Herein, the dynamic adsorption performance of ACFs pretreated using hydrogen peroxide and further functionalized by polydopamine (PDA/OACF) for trace Pb(II) ions was evaluated using a continuously operating fixed-bed adsorption device, and its adsorption behavior for trace Pb(II) ions was investigated at different bed heights, flow rates and influent lead ions concentrations. 0.6 g PDA/OACF could purify over127.80 L (22421 BVs) deionized water containing 150 μg L-1 Pb(II) ions and ensure the effluent concentration to meet WHO safe drinking water standard at 6 cm bed height and 5 mL min-1 flow rate. Four models including Thomas, Adams-Bohart, Yoon-Nelson and BDST models could fit the dynamic adsorption data well. The actual drinking water containing trace lead could also be efficiently purified and 0.6 g PDA/OACF could purify about 44 L (7719 BVs) tap water containing 150 μg L-1 Pb(II) by adding manganese sand filter media at the front end of the PDA/OACF fixed-bed. PDA/OACF shows superior cost competitiveness and good application prospect in the purification of drinking water. © 2024, The Authors. All rights reserved.

关键词： Potable water

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Insight into fluorescence properties of 14 selected toxic single-ring aromatic compounds in water:Experimental and DFT study

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Frontiers of environmental Science & Engineering 2020年第3期14卷 59-74页

作者： Muhammad Farooq Saleem Khan Jing Wu Cheng Cheng Mona Akbar Bo Liu Chuanyang Liu Jian Shen Yu Xin State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Research Institute for Environmental Innovation(Suzhou) Tsinghua UniversitySuzhou 215000China School of Physical Science and Technology&Jiangsu Key Laboratory of Thin Films Soochow UniversitySuzhou 215006China

Various single-ring aromatic compounds in water sources are of great concern due to its hazardous impact on the environment and human *** fluorescence excitation-emission matrix(EEMs)spectrophotometry is a useftil method to identify organic pollutants in *** study provides a detailed insight into the fluorescence properties of the 14 selected toxic single-ring aromatic compounds by experimental and theoretical *** theoretical analysis were done with Time-Dependent Density Functional Theory(TD-DFT)and B3LYP/6-31G(d,p)basis set,whereas,Polarizable Continuum Model(PCM)was used to consider water as *** selected compounds displayed their own specific excitation-emission(Ex/Em)wavelengths region,at Ex<280 nm and Em<340 nm,*** the theoretical Ex/Em was observed *** at 240 nm-260 nm and Em at 255 nm-300 *** as a strong aromatic base has longer Em(340 nm)than alkyl,carbonyl,and halogens substituted *** lone pair of electrons at amide substituent serves as a 7r-electron contributor into the aromatic ring,hence increasing the stability and transition energy,which results in longer emission and low quantum yield for the *** fluorescence of halogenated benzenes illustrates an increase in the HOMO-LUMO energy gap and a decrease in quantum yield associated with atomic size(F>Cl>Br>I).In this study the theoretical results are in line with experimental *** understanding of fluorescence and photophysical properties are of great importance in the identification of these compounds in the water.

关键词： Fluorescence Photophysical properties Effect of the substituent Toxic aromatic compounds

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Distribution Characteristics of Antibiotic Resistance Genes in Rainfall Runoff and Combined Sewer Overflow

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SSRN 2022年

作者： Pan, Xinrong Chen, Lei Zhang, Liping Zuo, Jiane College of Biology and Environmental Engineering Zhejiang Shuren University Hangzhou310015 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Rainfall runoff and combined sewer overflow (CSO) converge the organics, nutrients, and microbes from ground and wastewater. These pollutants will promote the proliferation and transformation of antibiotic resistance genes (ARGs). In this study, 4 rainfall runoff sites and 1 CSO outfall site were chosen and samples were taken during rainfall period. The ARGs were extracted from suspended solid (SS) and analysed by metagenomic sequencing. There were 888 ARG subtypes belonging to 17 ARG types were detected in all the samples. 11 of the ARGs were shared by 5 samples. The ARGs of multidrug type had the highest relative abundance. Its total relative abundance reached 1.07 copy ratio (copy of ARG/copy of 16S rRNA gene), and comprised 46.6% of all the ARGs. In all the samples, the CSO outfall had the highest total relative abundance (8.25×10-1 copy ratio) of ARGs, with a relative abundance range of 0-3.78×10-1 copy ratio. Further, the relationship between ARGs types and environmental factors was showed by RDA analysis. The results showed that COD concentration and bacteria abundance has a positive correlation to most ARGs, like multidrug, bacitracin, aminoglycoside, β -lactam, tetracycline, and sulfonamide. The relationship between ARGs subtypes were illustrated by network analysis. The multidrug resistance gene subtypes had the highest frequency of co-occurrence. This study sheds light on the occurrence and distribution of ARGs in non-point pollution and analyzed the relationship between ARGs and environmental factors. © 2022, The Authors. All rights reserved.

关键词： Antibiotics

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Industrial-Scale Highly Efficient Nickel Recovery from Electroplating Wastewater Using Resin Adsorption Followed by Aeration Mixing Acid Regeneration

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SSRN 2023年

作者： Li, Tong Ji, Xianhua Wang, Dongsheng Zhang, Qianxin Zhang, Menghan Yu, Gang Deng, Shubo State Key Joint Laboratory of Environment Simulation and Pollution Control Beijing Key Laboratory for Emerging Organic Contaminants Control School of Environment Tsinghua University Beijing100084 China Jiangsu Jingyuan Environmental Protection Co. Ltd. Jiangsu Nantong226000 China Advanced Interdisciplinary Institute of Environmental and Ecology Beijing Normal University Zhuhai519000 China

Cation-exchange resins have been widely used to recover nickel from electroplating wastewater, while resin regeneration often consumes a large amount of acid and alkali, resulting in low nickel concentrations in regeneration solution. In this study, the industrial-scale nickel recovery from electroplating wastewater using resin adsorption and regeneration was investigated. Two cation-exchange resin tanks and one chelated resin tank in series effectively reduced the nickel concentrations to below 0.1 mg/L, meeting the strictest nickel discharge standard. The spent resin could be efficiently regenerated by a novel aeration mixing method, which greatly reduced acid and alkali consumption in comparison with the traditional downstream regeneration method, and the acid utilization ratio was 99.9%. The spent resin was regenerated by 4% - 7.2% (w/w) HCl eluent, and 2 bed volume (BV) of 6% HCl showed the better regeneration, achieving high nickel concentration and acid utilization. More than 60 g/L of nickel ions in regeneration solution was stably obtained by synergistically controlling the concentration and volume of eluent and enhancing mass transfer by aeration, which benefited the subsequent nickel recovery by electrodeposition, and the regeneration time was greatly reduced to 2-3 h. Similarly, H2SO4 was also effective for nickel desorption from the spent resins. This study provided an effective resin regeneration method to consume less regenerant and obtain high nickel concentrations, making the nickel recovery cost-effective. © 2023, The Authors. All rights reserved.

关键词： Mixing

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