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Transactions of Nonferrous Metals Society of China 2022年第12期32卷 4062-4075页

作者： Zhen-xing WANG Yun-jun YU Tian-tian YE Jiang-chi FEI Xin-yu SONG Jian-wei PENG Yao-yu ZHOU Hong-hua WU South China Institute of Environmental Sciences Ministry of Ecology and EnvironmentGuangzhou 510530China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control Guangzhou 510655China College of Resources and Environment Hunan Agricultural UniversityChangsha 410128China Guangxi Hezhou Dongrong Industrial Investment Group Co. Ltd.Hezhou 542899China

Limited information is available on long-term effects of metal(loid)s pollution incidents. Here, we analyze the distribution characteristics and quantification of elements in the Southwest China Keda mining site, which is one of the most populated sites and enables human health and ecological risk assessments of elemental pollution. The results on modified degree of contamination indicated that the soil and sediment were highly contaminated near Dahu *** health risk of children was almost 2.5 times that of adults in surface water, and 7.1 times in soil, ***, Tl and As were the main health risk contributors in surface water and soil, respectively, and As posed the highest ecological risk both in soil and sediment. These results indicated the potential impact of toxic metal(loid)s on the health of residents and environment. Hence, more scientific attention and proper management need to be paid to this environmental challenge in the future.

关键词： thallium arsenic mining site ecological risk health risk

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

Potential Effects of Cu2+ Stress on Nitrogen Removal Performance, Microbial Characteristics, and Metabolism Pathways of Biofilm Reactor

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SSRN 2024年

作者： Zhang, Shuai Huang, Xiao Dong, Wenyi Wang, Hongjie Hu, Liangshan Zhou, Guorun Zheng, Zhihao Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China Shenzhen518055 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Harbin150090 China

Sequencing batch biofilm reactors (SBBR) were utilized to investigate the impact of Cu2+ on nitrogen (N) removal and microbial characteristics. The result indicated that the low concentration of Cu2+ facilitated the removal of ammonia nitrogen (NH4+-N), total nitrogen (TN). Compared with the control group of the average effluent concentration, the average effluent concentrations of NH4+-N, TN were found to decrease by 40.53%, 15.86%, respectively. Conversely, the high concentration of Cu2+ resulted in a increase of 94.27%, 14.23% in the aforementioned parameters, compared with the control group. The addition of low concentrations of Cu2+ significantly (P © 2024, The Authors. All rights reserved.

关键词： Nitrogen removal

Impact of meteorological condition changes on air quality and particulate chemical composition during the COVID-19 lockdown

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Journal of environmental Sciences 2021年第11期33卷 45-56页

作者： Jing Ding Qili Dai Yafei Li Suqin Han Yufen Zhang Yinchang Feng Tianjin Environmental Meteorological Center Tianjin 300074China State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and EngineeringNankai UniversityTianjin 300350China CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research Tianjin 300074China

Stringent quarantine measures during the Coronavirus Disease 2019(COVID-19)lockdown period(January 23,2020 to March 15,2020)have resulted in a distinct decrease in anthropogenic source emissions in North China Plain compared to the paralleled period of ***,22.7%decrease in NO_(2)and 3.0%increase of O_(3)was observed in Tianjin,nonlinear relationship between O_(3)generation and NO_(2)implied that synergetic control of NOx and VOCs is *** meteorological condition during the COVID-19 lockdown obscured the actual PM2.5 *** transport in 2020 Spring Festival(SF)triggered regional haze ***2.5 during the COVID-19 lockdown only reduced by 5.6%in *** we used the dispersion coefficient to normalize the measured PM2.5(DN-PM2.5),aiming to eliminate the adverse meteorological impact and roughly estimate the actual PM2.5 reduction,which reduced by 17.7%during the COVID-19 *** terms of PM2.5 chemical composition,significant NO_(3)−increase was observed during the COVID-19 ***,as a tracer of atmospheric oxidation capacity,odd oxygen(Ox=NO_(2)+O_(3))was observed to reduce during the COVID-19 lockdown,whereas relative humidity(RH),specific humidity and aerosol liquid water content(ALWC)were observed with noticeable *** oxidation rate(NOR)was observed to increase at higher specific humidity and ALWC,especially in the haze episode occurred during 2020SF,high air humidity and obvious nitrate generation was *** enhanced air humidity may response for the nitrate increase during the COVID-19 lockdown period.

关键词： COVID-19 lockdown Air quality Meteorological condition Air humidity Aerosol chemistry

Molecular Tracers, Mass Spectral Tracers and Oxidation of Organic Aerosols Emitted from Cooking and Fossil Fuel Burning Sources

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SSRN 2022年

作者： Liang, Chengrui Wang, Shuxiao Hu, Ruolan Huang, Guanghan Xie, Jinzi Zhao, Bin Li, Yuyang Zhu, Wenfei Guo, Song Jiang, Jingkun Hao, Jiming State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing100084 China College of Environmental Sciences and Engineering Peking University Beijing100871 China

Secondary organic aerosol (SOA) composes a substantial fraction of atmospheric particles, yet the formation and aging mechanism of SOA remains unclear. Here we investigate the initial oxidation of primary organic aerosol (POA) and further aging of SOA in winter Beijing by using aerosol mass spectrometer (AMS) measurements along with offline molecular tracer analysis. ME-2 source apportionment was conducted to capture the characteristic of source-related SOA, and connect them with specific POA. Our results show that urban cooking and fossil fuel burning sources contribute significantly (17% and 20%) to total organic aerosol (OA) in winter Beijing. Molecular tracer analysis by GC×GC reveals that cooking SOA (CSOA) is produced through both photooxidation and aqueous-phase processing, while less oxidized SOA (LO-SOA) is the photooxidation product of fossil fuel burning OA (FFOA) and may experience aqueous-phase aging to form more-oxidized oxygenated OA (MO-OOA). Furthermore, C 3 HO 2 + and C 4 H 5 O 2 + are mass spectral tracers indicating the initial photooxidation, while CH 2 O + and C 2 H 2 O 2 + imply further aqueous-phase aging of OA. Tracer analysis indicates that the formation of diketones dominates the initial photooxidation of POA, while the formation of glyoxal and diacids dominates the further aqueous-phase aging of SOA. © 2022, The Authors. All rights reserved.

关键词： Photooxidation

Construction of Thin-Film Nanocomposite Membranes by Incorporating Acyl Chloride@Mos2 for Enhanced Nanofiltration Performance

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SSRN 2023年

作者： Wang, Xiaoping Liu, Yanling Fan, Kaiming Cheng, Peng Xia, Shengji State Key Laboratory of Pollution Control and Resources Reuse Advanced Membrane Technology Center Tongji University Shanghai200092 China Key Laboratory of Yangtze River Water Environment Ministry of Education Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security China

Incorporating suitable-sized nanoparticles into the organic phase of interfacial polymerization to form a nanomaterial-polyamide (PA) selective layer is a promising approach to enhancing membrane performance. In this work, we prepared novel thin-film nanocomposite (TFN) membranes by modifying the PA layer with acyl chloride@MoS2 nanoparticles. Compared to the thin-film composite (TFC) control membrane, the TFN membranes possessed a looser PA layer as well as a rougher and more hydrophilic surface with more negative charges, confirming the significant effects of the incorporated acyl chloride@MoS2 nanoparticles on the PA layer formation. The optimal TFN membrane achieved a high Na2SO4 rejection of 98.6% and a satisfying water permeance of 27.1 L m-2 h-1 bar-1, over 2.9 times higher than that of the TFC membrane (9.3 L m-2 h-1 bar-1). Moreover, attributed to the chemical affinities (including covalent connection, hydrogen bonds, and electrostatic attraction) between acyl chloride groups of the nanoparticles and the PA matrix, the TFN membranes exhibited excellent long-term operation stability. The beneficial effect of grafting acyl chloride groups on the surface of MoS2 nanoparticles was verified by the more superior membrane performance enabled by acyl chloride@MoS2 than that achieved by original MoS2. This study offers a feasible strategy to improve the performance of TFN nanofiltration membranes by utilizing proper nanoparticles as organic phase additives. © 2023, The Authors. All rights reserved.

关键词： Nanoparticles

Low-Carbon Pathway in Municipal Life Plastic Waste Disposal Can Bring Net Benefit: A Case Study for Nanjing, China

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SSRN 2024年

作者： Wang, Zi-Yang Liu, Li-Na Jiang, Wei Zhang, Quan-Xing Sun, Ping State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China JSTI Energy Technology Development Co. Ltd. Nanjing210017 China

The disposal of Municipal Life Plastic Waste (MLPW) in Nanjing not only contributes to greenhouse gas (GHG) emissions but also fails to fully exploit its economic benefits. This study investigates the long-term potential for emission reduction associated with MLPW disposal, in line with China's "14th Five-Year Plan for Plastic pollution". Employing an integrated bottom-up model, we assessed the lifecycle material flow of Nanjing's MLPW in 2020 and predicted its environmental impact and benefits to 2060 under multi-objective low-carbon scenarios. Results suggest measures combing source reduction, biomaterial replacement, recycling and utilization can yield significant environmental and economic benefits. The strategy proposed in this study is expected to achieve 96.3% reduction in greenhouse gas emissions, while also obtaining significant economic benefits up to 2060. We advocate that prioritizing mechanical recycling is the optimal path to mitigate emissions and enhance economic benefits. The study provides data support and path recommendation for the management of municipal life plastic waste. © 2024, The Authors. All rights reserved.

关键词： Waste disposal

Lewis Acid-Rich Srfexti1-Xo3/Tio2 to Enhance the Photocatalytic Reduction of Nitrate to N2

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SSRN 2024年

作者： Chen, Lifang Zheng, Haiyang Li, Aimin Qiu, Xin Wang, Lian State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China Nanjing University Yancheng Academy of Environmental Protection Technology and Engineering Yancheng224000 China

The photocatalytic reduction of nitrate has received considerable attention due to its high efficiency and environmentally friendly nature. The excessive addition of hole scavengers is the most commonly used method to increase the nitrate reduction efficiency. However, achieving high selectivity in the photocatalytic reduction of nitrate to N2 with low concentration of hole scavengers remains challenging. In this study, the SrFexTi1-xO3/TiO2 S-scheme heterojunction photocatalysts with many Lewis acidic adsorption sites have been developed. The experimental results demonstrated that the incorporation of 6% Fe into SrFe6Ti94O3/TiO2 (SFTO6) resulted in the nitrate conversion rate of 97.68% and the N2 selectivity reached 96.35% with 25 mmol/L formic acid. Moreover, it also exhibited excellent stability and recycle ability. After 5 cycles, SFTO6 exhibited a photocatalytic denitration efficiency of 92.94%, highlighting its potential for practical application. Through comprehensive mechanistic investigations, we have considered that the excellent charge transfer capability of the material contributes to its high reduction efficiency with low formic acid concentration. And the Lewis acidic adsorption sites enhance N2 selectivity by enriching NOx− on the surface of the material. Overall, this study provides a novel approach for achieving efficient photocatalytic reduction of nitrate to N2 under conditions with low concentration of hole scavengers. © 2024, The Authors. All rights reserved.

关键词： Heterojunctions

New insights into autochthonous fungal bioaugmentation mechanisms for recalcitrant petroleum hydrocarbon components using stable isotope probing

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Science of the Total environment 2025年 958卷 178082页

作者： Huang, Qihui Dai, Yeliang Yang, Guiqin Zhuang, Li Luo, Chunling Li, Jibing Zhang, Gan Guangdong Key Laboratory of Environmental Pollution and Health College of Environment and Climate Jinan University Guangzhou511443 China State Key Laboratory of Organic Geochemistry and Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China University of Chinese Academy of Sciences Beijing100039 China Ningbo Research Institute of Ecological and Environmental Sciences Ningbo315000 China

Autochthonous fungal bioaugmentation (AFB) is a promising strategy for the microbial remediation of petroleum hydrocarbon (PH)-contaminated soils. However, the mechanisms underlying AFB, particularly for degrading recalcitrant PH components, are not fully understood. This study employed stable isotope probing (SIP) and high-throughput sequencing to investigate the AFB mechanisms of two hydrocarbon-degrading fungi, Fusarium solani LJD-11 and Aspergillus fumigatus LJD-29, focusing on three challenging PH components: n-Hexadecane (n-Hex), Benzo[a]pyrene (BaP), and Dibenzothiophene (DBT). Our findings indicate that both fungal strains significantly enhanced pollutant removal rates, with combined application yielding optimal results. AFB treatment reduced the microbial diversity index and altered the soil microbial community, especially affecting fungal populations. A significant correlation between the microbial diversity index and degradation efficiency suggests that greater diversity enhances pollutant removal. SIP analysis showed that LJD-11 and LJD-29 could directly assimilate n-Hex and DBT, but not BaP. Correlation analyses between functional microorganisms and other biological indicators suggest that the removal of pollutants is also attributable to indigenous functional bacteria. Additionally, non-inoculated functional fungi present in the soil play a crucial role in BaP degradation. These findings reveal distinct degradation pathways for the three pollutants. The addition of carrier substrate reduced the complexity of the network, while AFB treatment restored it. In addition, the combined fungal treatment resulted in higher network parameters, leading to a more complex and stable network structure. These results provide insights into the mechanisms of AFB for degrading recalcitrant PH components, underscoring its potential for in situ bioremediation of petroleum-contaminated soils. © 2024 Elsevier B.V.

关键词： Soil pollution

Effect of Nh4+-N and Ammonia-Oxidizing Bacteria on Atenolol Removal During Simulated Riverbank Filtration

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SSRN 2022年

作者： Zhao, Jian Fang, Shangbiao Qi, Weixiao Liu, Huijuan Qu, Jiuhui Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Beijing Laboratory of Environmental Frontier Technologies School of Environment Tsinghua University Beijing100084 China

Riverbank filtration (RBF) is used worldwide for drinking water production and has been proven to remove organic micro-pollutants (OMPs) mainly by adsorption and biodegradation. Since NH4+-N is a common contaminant in surface water, its effect on ammonia-oxidizing bacteria (AOB) and the further role of AOB co-metabolism on OMPs degradation during RBF is unknown. Here, we selected atenolol as a typical OMP to explore the effect of NH4+-N concentration on atenolol removal and the role of AOB in atenolol biodegradation. The results showed that RBF is an effective barrier for atenolol mainly by biodegradation and adsorption. The ratio of biodegradation and adsorption to atenolol removal was related to atenolol ***, low concentration (500 ng/L) is almost completely removed by adsorption, while higher concentration (100 μg/L) is removed by biodegradation (51.7%) and adsorption (30.8%). Therefore, long-term difference in influent NH4+-N concentrations showed insignificant impact on atenolol (500 ng/L) removal as adsorption was the dominated removal mechanism. Besides, AOB enhanced the removal of atenolol (100 μg/L) as biodegradation played a more crucial role in removing atenolol under this concentration. Both AOB and heterotrophic bacteria can degrade atenolol during RBF, but the degree of AOB contribution is probably related to the concentration of atenolol exposure. The main reactions occurred during atenolol biodegradation possibly included primary amide hydrolysis, hydroxylation and secondary amine depropylation. About 90% of the bio-transformed atenolol was produced to atenolol acid. AOB could transform atenolol to atenolol acid by inducing primary amide hydrolysis but failed to degrade atenolol acid further under the conditions of this paper. This study provides novel insights regarding the roles played by AOB in OMPs biotransformation during RBF. © 2022, The Authors. All rights reserved.

关键词： Biodegradation