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Frontiers of environmental Science & Engineering 2020年第6期14卷 75-85页

作者： Mona Akbar Muhammad Farooq Saleem Khan Ling Qian Hui Wang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Sino-Japan Friendship Center for Environmental Protection Beijing 100029China

Polyacrylamide(PAM)is generally employed in wastewater treatment processes such as sludge dewatering and therefore exists in the ***,it degrades slowly and can deteriorate methane yield during anaerobic digestion(AD).The impact or fate of PAM in AD under thermophilic conditions is still *** study mainly focuses on PAM degradation and enhanced methane production from PAM-added sludge during 15 days of thermophilic(55°C)AD compared to mesophilic(35°C)*** and PAM dose from 10 to 50 g/kg TSS were *** results showed that PAM degraded by 76%to 78%with acrylamide(AM)content of 0.2 to 3.3 mg/L in thermophilic ***,it degraded only 21%to 30%with AM content of 0.5 to 7.2 mg/L in mesophilic *** methane yield was almost 230 to 238.4 mL/g VSS on the 8th day in thermophilic AD but was 115.2 to 128.6 mL/g VSS in mesophilic *** investigation revealed that thermophilic AD with continuous stirring not only enhanced PAM degradation but also boosted the organics release from the sludge with added PAM and gave higher methane yield than mesophilic AD.

关键词： Polyacrylamide(PAM)degradation Acrylamide(AM) Mesophilic anaerobic digestion Thermophilic anaerobic digestion Methane production

Aridity affects soil organic carbon concentration and chemical stability by different forest types and soil processes across Chinese natural forests

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Science of the Total Environment 2024年 944卷 174002页

作者： Xu, Shan Yang, Yuanxi Sun, Guodong Zhang, Qiang Wang, Yinghui Zeng, Hui Simpson, Myrna J. Wang, Junjian State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China School of Urban Planning and Design Shenzhen Graduate School Peking University Shenzhen518055 China Environmental NMR Centre and Department of Physical and Environmental Sciences University of Toronto Scarborough 1265 Military Trail TorontoONM1C 1A4 Canada

Forest soils play a critical role in carbon (C) reservoirs and climate change mitigation globally. Exploring the driving factors of soil organic carbon (SOC) concentration and stability in forests on a large spatial scale can help us evaluate the role of forest soils in regulating C sequestration. Based on SOC quantification and solid-state 13C nuclear magnetic resonance spectroscopy, we investigated the SOC concentration and SOC chemical stability (indicated by alkyl-to-O-alkyl ratio and hydrophobic-to-hydrophilic ratio) in top 0–5 and 5–10 cm soils from 65 Chinese natural forest sites and explored their driving factors. Results showed that SOC concentration in 0–5 cm soils were highest in mixed forests but SOC chemical stability in 0–5 cm soils were highest in coniferous forests, while SOC concentration and chemical stability in 5–10 cm soil layers did not differ across forest types. SOC concentration in 0–5 cm was directly related to soil pH and soil bacterial diversity. Structural equation models showed that aridity indirectly affected SOC concentration in 0–5 cm by directly affecting soil pH. While SOC chemical stability in 0–5 cm soils was higher with increased aridity. According to the correlations, the potential mechanisms could be attributed to higher proportion of coniferous forests in more arid forest sites, lower relative abundance of O-alkyl C, higher MgO and CaO contents, and higher bacterial diversity in soils from more arid forest sites. Our study reveals the important role of aridity in mediating SOC concentration and chemical stability in top 0–5 cm soils in Chinese natural forests on a large-scale field investigation. These results will help us better understand the different mechanisms underlying SOC concentration and stability in forests and assess the feedback of forest SOC to future climate change. © 2024 Elsevier B.V.

关键词： Chemical stability

Adsorption of Gas-Phase Sulfur Mustard on environmental Water/Ice Films

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SSRN 2023年

作者： Hao, Shangpeng Chen, Jing Wang, Haitao State Key Laboratory of NBC Protection for Civilian Beijing102205 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Beijing Normal University Beijing100875 China

Sulfur mustard (HD), a highly toxic vesicant used as a Chemical Warfare Agent (CWA), can remain for a few weeks once leaked into the environment. This work investigated the mass uptake of sulfur mustard vapor on thin water and ice films as well as air-water/ice interfacial and bulk partitioning of sulfur mustard under several typical environmental conditions by using a flow tube reactor. The partition constant of sulfur mustard in the sea water was close to that of pure water, and greater than that in the river water. The effects of water properties (including salinity, humic -like substance contents, and surface tension) on the air-water partitioning of HD were investigated. The adsorption enthalpies and entropies of HD uptake in thin water film were obtained from the temperature dependence was 20.76±1.08 kJ/mol and 71.58±3.91 J/mol. The quasi-liquid layer on the ice surface appeared to play a crucial role in the adsorption process as the ice thickness decreased. The data collected in this study are essential in developing effective strategies for managing and mitigating the risks associated with the leakage of chemical warfare agents containing sulfur mustard. © 2023, The Authors. All rights reserved.

关键词： Adsorption

Spatiotemporal pattern of ENSO-induced modulation on landscape fires over Pacific Rim from 2001 to 2020

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Advances in Climate Change Research 2024年第6期15卷 1057-1066页

作者： Fang-Zhou LI Ning-Ran LI Martin J.WOOSTER Wen-Shi LIN Tao XUE Tong ZHU State Key Joint Laboratory of Environment Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China State Environmental Protection Key Laboratory of Atmospheric Exposure and Health Risk Management and Center for Environment and HealthPeking UniversityBeijing 100871China School of Science Swinburne University of TechnologyMelbourne VIC 3122Australia Leverhulme Centre for Wildfires Environment&SocietyDepartment of GeographyKing's College LondonLondon WC2R 2LSUK NERC National Centre for Earth Observation Department of GeographyKing's College LondonLondon WC2R 2LSUK School of Atmospheric Sciences Sun Yat-sen UniversitySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519000China Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Sun Yat-sen UniversityZhuhai 519000China Institute of Reproductive and Child Health National Health Commission Key Laboratory of Reproductive Health/Department of Epidemiology and BiostatisticsMinistry of Education Key Laboratory of Epidemiology of Major Diseases(PKU)School of Public HealthPeking University Health Science CentreBeijing 100191China Research Station of Alpine Ecology Environment and Health Tibet UniversityLhasa 850000China

While El Niño-Southern Oscillation(ENSO)modulates landscape fire activities across the Pacific Rim,the detailed patterns and mode-specific variations of these effects remain poorly *** study aims to address that gap by systematically assessing the spatiotemporal variations in burned areas from 2001 to 2020 during different modes of ENSO,namely,Eastern Pacific(EP)El Niño,EP La Niña,Central Pacific(CP)El Niño and CP La Niñ*** evaluate the modulation patterns using classical correlation and cross-spectrum analyses,focusing on five hotspot regions:Temperate North America(TENA),Southern Hemisphere South America(SHSA),Northern Hemisphere South America(NHSA),Equatorial Asia(EQAS)and Australia and New Zealand(AUST).El Niño and La Niña exhibit asymmetrical opposite effects on burned areas,as *** findings reveal spatial non-uniformity in the impact of ENSO on landscape fires,with La Niña enhancing burned areas in TENA and SHSA,whereas El Niño predominantly affects AUST,EQAS and *** and EP ENSO events differ in intensity and their large-scale circulation *** differences cause notable variations in the regional burned *** vapour redistribution emerges as the key *** study emphasises the heterogeneity in ENSO modes in regulating landscape fires,providing insights for future landscape fire risk assessment and prevention efforts under climate change.

关键词： ENSO mode Landscape fire Burned area Pacific Rim

Increased dependence on mycorrhizal fungi for nutrient acquisition under carbon limitation by tree girdling

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Plant Diversity 2025年第3期47卷 466-478页

作者： Chen, Jing Cao, Jingjing Guo, Binglin Han, Meixu Feng, Zhipei Tang, Jinqi Mo, Xiaohan Wang, Junjian Yang, Qingpei Pei, Yuxin Kuzyakov, Yakov Ding, Junxiang Makita, Naoki Yang, Xitian Zhang, Haiyang Zhao, Yong Kong, Deliang College of Forestry Henan Agricultural University Zhengzhou 450002 China College of Horticulture China Agricultural University Beijing 100193 China School of Urban Planning and Design Peking University Shenzhen Graduate School Peking University Shenzhen 518055 China State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Department of Soil Science of Temperate Ecosystem University of Göttingen Göttingen 37077 Germany Peoples Friendship University of Russia (RUDN University) Moscow 117198 Russian Federation College of Ecology and Environment Zhengzhou University Zhengzhou 450001 China Faculty of Science Shinshu University 3-1-1 Asahi Nagano Matsumoto 390-8621 Japan Hawkesbury Institute for the Environment Western Sydney University Penrith 2751 NSW Australia College of Life Science Hebei University Baoding 071002 China

Nutrient acquisition through symbiotic ectomycorrhizal fungi is carbon (C) costly but fundamental for plant growth, community, and ecosystem functioning. Here, we examined the functions of roots and mycorrhiza with respect to nutrient uptake after artificially inducing C limitation-seven months after girdling of an ectomycorrhizal tree, Pinus taeda. Root physiological activity (measured as root nitrogen content and root exudation) declined after girdling and was accompanied with 110% and 340% increases in mycorrhizal colonization and extramatrical hyphal length, respectively. Fungi colonizing roots switched to a community characterized by higher C efficiency (lower C cost) of nutrient acquisition (CENA, the amount of nutrient acquisition per unit C cost) and lower network complexity, indicating a tradeoff between CENA and stability of the fungal community. Root transcriptome analysis suggested a shift in metabolic pathways from a tricarboxylic acid cycle decomposition of carbohydrate to lipid biosynthesis to maintain closer associations with mycorrhiza for nutrient cycling after the girdling. By integrating multi-level evidence, including root transcriptome, fungal composition, and network complexity data, we demonstrate an increased dependence on mycorrhiza for nutrient acquisition under the C limitation condition, which is likely due to a shift to fungal community with higher CENA at the cost of lower stability. © 2025 Kunming Institute of Botany, Chinese Academy of Sciences

关键词： Carbon limitation Fungal network complexity Girdling effects Mycorrhizal and root strategies Plant–microbiome interaction Root transcriptome

Long-Term Plume-Chasing Measurements: Emission Characteristics and Spatial Patterns of Heavy-Duty Trucks in a Megacity

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SSRN 2024年

作者： Yang, Pan Wang, Hui Wu, Xiaomeng Xiao, Shupei Zheng, Xuan You, Yan Zhang, Shaojun Wu, Ye State Key Joint Laboratory of Environment 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 Chemistry and Environmental Engineering Shenzhen University Guangdong Shenzhen518060 China National Observation and Research Station of Coastal Ecological Environments in Macao Macao Environmental Research Institute Macau University of Science and Technology 999078 China

Assessing the emissions of heavy-duty diesel trucks (HDDTs) is crucial for managing air quality in megacities, especially concerning nitrogen oxides (NOX) and black carbon (BC). This study employed mobile plume chasing to monitor the real-world emissions of over 7,778 HDDTs in Shenzhen. The findings indicate that the real-world NOX emission factors (EF) of China IV trucks did not differ significantly from those of China III, whereas China V and VI vehicles demonstrated fleet-averaged reductions of 27% and 85%, respectively. For China V, a significant decrease in the NOX EF for HDDTs registered after 2017 was attributed to the installation of advanced aftertreatment systems, including diesel oxidation catalysts (DOC) and Diesel Particle Filters (DPF), along with selective catalytic reduction (SCR). These technologies led to an average reduction of 42% in NOX and 61% in BC emissions. Seasonal variations were pronounced, with winter (~20°C) NOX EF 40% higher than summer (~35°C) levels. Conversely, BC EF decreased by 26% in winter, indicating significant impacts of ambient temperature on emissions. Spatial analysis revealed that the average NOX EF of HDDTs on east freeways was 1.4 times higher than that on urban expressways, influenced by variations in the proportion of vehicle types segmented by usage. These findings offer a comprehensive perspective on HDDTs emissions, highlighting the importance of large-scale emission monitoring through plume chasing for precise and effective control of real-world HDDTs emissions. © 2024, The Authors. All rights reserved.

关键词： Nitrogen oxides

Towards rational design of Cu-SSZ-13 catalysts with less N2O formation in NH3-SCR reaction: The effect of Brønsted acid sites

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Journal of environmental Sciences (China) 2025年 157卷 546-557页

作者： Liu, Jianqi Du, Jinpeng Wang, Jingyi Han, Shichao Shan, Yulong Zhang, Yan Wu, Xuanhao Gao, Shan Yu, Yunbo Wu, Zhongbiao Shan, Wenpo He, Hong Fujian Key Laboratory of Atmospheric Ozone Pollution Prevention Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China University of Chinese Academy of Sciences Beijing100049 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research Station Institute of Urban Environment Chinese Academy of Sciences Ningbo315800 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201210 China Department of Environmental Engineering Zhejiang University Hangzhou310058 China Zhejiang Tianlan Environmental Protection Technology Co. Ltd. Hangzhou311202 China

Ammonia Selective Catalytic Reduction (NHs-SCR) technology has been employed to eliminate NOx from diesel engine exhaust, with Cu-SSZ-13 serving as the commercial catalyst. The greenhouse gas N2O is produced as a byproduct when using Cu-SSZ-13 as the NH3-SCR catalyst. To achieve synergistic control of pollutants and greenhouse gases in diesel engine exhaust, rational design of Cu-SSZ-13 catalysts is required. In this study, the effect of Brønsted acid sites in Cu-SSZ-13 catalysts on the formation of N2O was investigated. Mild thermal treatment was innovatively employed to prepare Cu-SSZ-13 catalysts with different amounts of Brønsted acid sites. EPR, H2-TPR, NH3-TPD, NMR were utilized to determine that the Brønsted acid sites were modified while the Cu species remained unchanged. Thereby an accurate assessment of the influence of Brønsted acid sites on N2O formation could be achieved. Our results showed that Cu-SSZ-13 with more Brønsted acid sites produced less N2O during the NH3-SCR reaction. In the low-temperature region, the presence of framework acid sites facilitates the decomposition of the NH4NO3 assisted by NO to form N2 and H2O, reducing the formation of N2O. In the high-temperature region, the Brønsted acid sites promote the decomposition of NH2NO into N2 and H2O. Meanwhile, the N2O-SCR reaction can also be promoted by Brønsted acid sites, thereby decreasing N2O emissions. This study suggests that in the future design and synthesis of Cu-SSZ-13 zeolites, attention should be paid to creating more Brønsted acid sites in Cu-SSZ-13 to reduce N2O emissions. © 2024

关键词： Emission control

Metagenomic and Ft-Icr Ms Insights into the Mechanism for the Arsenic Biogeochemical Cycling in groundwater

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SSRN 2024年

作者： Jiang, Honglin Xie, Xianjun Li, Junxia Jiang, Zhou Pi, Kunfu Wang, Yanxin School of Environmental Studies China University of Geosciences Wuhan430074 China State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution China University of Geosciences Wuhan430078 China

Arsenic (As) is a groundwater contaminant of global concern. The degradation of dissolved organic matter (DOM) can provide a reducing environment for As release;however, the interaction of DOM with local microbial communities and how different sources and types of DOM influence the biotransformation of As in aquifers is uncertain. This study used optical spectroscopy, Fourier transform ion cyclotron resonance mass spectrometry (FTIR-MS), metagenomics, and structural equation modeling (SEM) to demonstrate the how the biotransformation of As in aquifers is promoted. The results indicated the DOM in high-As groundwater is dominated by highly unsaturated low-oxygen compounds that are quite humic and unstable. Metagenomics analysis indicated Acinetobacter, Pseudoxanthomonas, and Pseudomonas predominate in high-As environments;these genera all contain As detoxification genes and are members of the same phylum (Proteobacteria). SEM analyses indicated the presence of Proteobacteria is positively related to highly unsaturated low-oxygen compounds in the groundwater and conditions that promote arsenite release. The results illustrate how the biogeochemical transformation of As in groundwater systems is affected by DOM from different sources and with different characteristics. © 2024, The Authors. All rights reserved.

关键词： Aquifers

Sustainable Cu2(OH)2CO3/g-C3N4/cellulose acetate-derived porous composite membrane for Congo red and tetracycline removal with photocatalytic self-cleaning properties under natural solar irradiation

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Sustainable Horizons 2023年 5卷

作者： Kong, Lingchao Wang, Qinyu Wang, Yi Yan, Qinlin Qiu, Wenhui Zheng, Chunmiao State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control Southern University of Science and Technology Guangdong Shenzhen518055 China School of Environment Harbin Institute of Technology Harbin150090 China Department of Ocean Science and Engineering Southern University of Science and Technology Shenzhen518055 China EIT Institute for Advanced Study Zhejiang Ningbo315200 China

A highly efficient and sustainable Cu/CN@CA composite membrane was synthesized for the removal of typical dyes and antibiotics by incorporating a Cu2(OH)2CO3/g-C3N4 heterojunction (Cu/CN) onto a cellulose acetate (CA) membrane. The 0.2Cu/CN@CA membrane with optimized Cu/CN doping achieved superior Congo red (CR) and tetracycline (TC) adsorption capacities of 250.8 and 48.43 mg/g, respectively. Notably, the exhausted 0.2Cu/CN@CA after adsorption saturation could be effectively self-cleaned under natural solar irradiation. Consecutive adsorption-photocatalytic experiments revealed its fine stability and recyclability. Mechanistic exploration based on experimental analysis and DFT (Density Function Theory) calculations revealed that cellulose acetate accommodates the charge transfer interactions between g-C3N4 and Cu2(OH)2CO3, wherein many photogenerated electrons were generated and migrated from g-C3N4 to Cu2(OH)2CO3. This type II heterojunction transfer pathway induced the strong oxidizability of the 0.2Cu/CN@CA membrane with plenty of active species for the photocatalytic degradation of the adsorbed CR and TC contaminants under solar light irritation. This study provided a novel sustainable membrane-based adsorbent for the enhanced dye and antibiotic contaminant remediation of aquatic environments. © 2023

关键词： Adsorption

Dom Contributions to Nitrate Enrichment in groundwater in the Semi-Arid Area of North China Plain: Evidence from Dom Optical and Molecular Characteristics

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SSRN 2023年

作者： Ding, Hongyu Zheng, Mingxia Yu, Minda Zhu, Mingtan Sun, Yuanyuan Su, Jing Xi, Beidou State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental Sciences Beijing100012 China College of Water Science Beijing Normal University Beijing100875 China School of Environment and Civil Engineering Jiangnan University Wuxi214122 China

Specific components of dissolved organic matter (DOM) may serve as indicators of the nitrate accumulation process in groundwater. However, the precise mechanisms underlying the enrichment of nitrate based on DOM characterization in groundwater systems remain unclear. This study aims to reveal the sources and pathways of the nitrate accumulation process through the application of three-dimensional Excitation Emission Matrices (EEM) and Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR-MS). The presence of fresh DOM components which show high biological activity, resulting from the leaching of organic matter in the subsoil and the excessive input of manure and sewage, contributes to elevated nitrate levels in the porous aquifer. The main contributors to inorganic nitrate accumulation are DOM formulas containing a higher number of nitrogen atoms. DOM formulas containing three nitrogen atoms, characterized by larger mass weights and lower H/C ratios, are closely associated with a readily bioavailable fraction. Consequently, the observed high rate of nitrate accumulation in the groundwater samples can be attributed to the high bioavailability of nitrogen-containing molecules. This study provides a molecular perspective on the characterization of DOM and its relationship with nitrate accumulation in groundwater systems, offering valuable insights for a more accurate assessment of potential nitrogen stocks in groundwater. © 2023, The Authors. All rights reserved.

关键词： Nitrates