检索结果-内蒙古大学图书馆

Degradation of polyacrylamide (PAM) and methane production by mesophilic and thermophilic anaerobic digestion: Effect of temperature and concentration

引用

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

来源：评论

学校读者我要写书评

暂无评论

Novel stable isotope concepts to track antibiotics in wetland systems

引用

Journal of environmental Sciences 2024年第12期146卷 298-303页

作者： Xiao Liu Junya Zhang Hans Hermann Richnow Gwenaël Imfeld Institut Terre et Environnement de Strasbourg(ITES) Universitéde Strasbourg/EOST/ENGEESCNRS UMR 7063F-67084 StrasbourgFrance State Key Joint Laboratory of Environmental Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Department of Technical Biogeochemistry Helmholtz Centre for Environmental Research-UFZPermoserstraße 1504318 LeipzigGermany Isodetect GmbH Deutscher Platz 5b04103 LeipzigGermany

Antibiotics,their transformation products,and the translocation of antibiotic-resistant genes in the environment pose significant health risks to humans,animals,and ecosystems,aligning with the One Health *** wetlands hold substantial yet underutilized potential for treating wastewater from agricultural,domestic sewage,or contaminated effluents from wastewater treatment plants,with the goal of eliminating ***,the comprehensive understanding of the distribution,persistence,and dissipation processes of antibiotics within constructed wetlands remains largely *** this context,we provide an overview of the current application of stable isotope analysis at natural abundance to *** explore the opportunities of an advanced multiple stable isotope approach,where isotope concepts could be effectively applied to examine the fate of antibiotics in *** development of a conceptual framework to study antibiotics in wetlands using multi-element stable isotopes introduces a new paradigm,offering enhanced insights into the identification and quantification of natural attenuation of antibiotics within wetland *** perspective has the potential to inspire the general public,governmental bodies,and the broader research community,fostering an emphasis on the utilization of stable isotope analysis for studying antibiotics and other emerging micropollutants in wetland systems.

关键词： Constructed wetlands Micropolluants Antibiotics Degradation,CSIA

来源：评论

学校读者我要写书评

暂无评论

High-density sampling reveals the occurrence, levels and transport flux of 15 polycyclic aromatic hydrocarbons derivatives (PAHs-d) along the Yangtze River

引用

Science of the Total environment 2025年 958卷 177907页

作者： Xie, Yu Guo, Jiaxun Fan, Qinya Huang, Shier Qi, Weixiao Cao, Xiaofeng Peng, Jianfeng Chen, Yufeng Chen, Min Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Yangtze Eco-Environment Engineering Research Center China Three Gorges Corporation Beijing100084 China School of Environment and Spatial Informatics China University of Mining and Technology Xuzhou221116 China

Polycyclic aromatic hydrocarbons derivatives (PAHs-d) have higher toxicity levels compared to its parent polycyclic aromatic hydrocarbons (PPAHs). Their partitioning in different media and large-scale transport patterns in rivers remain largely unknown. This study investigated the occurrence of 15 PAHs-d and 19 PPAHs in water and suspended particulate matter (SPM) of the Yangtze River between 2019 and 2020. The range of Σ15PAHs-d concentrations was 20.54 to 2010.03 ng·L−1 in water and 0.62 to 29.80 μg·g−1 in SPM. The primary PAHs-d components were 2,6-dimethylnaphthalene, 2-methylnaphthalene, and anthraquinone. The range of Σ19PPAHs concentrations in water and SPM was 34.89 to 739.53 ng·L−1 and 0.37 to 204.62 μg·g−1, respectively. And low-ring PAHs-d and PPAHs were more prevalent in water than SPM. Partitioning behaviors indicated that PAHs-d and PPAHs were more readily partitioned into water and SPM during normal and dry periods, respectively. The concentrations of PAHs-d saw significant changes in their spatial distribution, which rose in water and reduced in SPM in downstream of the Three Gorges Dam. This is due to the dam's blocking effect on sediment transport. Positive matrix factorization source analysis revealed biomass combustion upstream and vehicle emissions downstream as primary sources, shaped by the evolving energy consumption patterns of urban areas situated around the Yangtze River. The annual fluxes of PAHs-d in water and SPM of the Yangtze River were 90.40 t·yr−1 and 11.95 t·yr−1, representing 88.3 % and 11.7 % of the overall PAHs-d fluxes, respectively. The total fluxes of PAHs-d and PPAHs in water and SPM tended to increase spatially along the river, with growth rates exceeding 76 and 24 times, respectively. Interception within the Three Gorges Reservoir area has resulted in the differences in the concentration and transport distribution of PAHs-d and PPAHs upstream and downstream, which play important roles in reducing PAHs-d and PPAHs entry int

关键词： Matrix factorization

来源：评论

学校读者我要写书评

暂无评论

Significant contribution of spring northwest transport to volatile organic compounds in Beijing

引用

Journal of environmental Sciences 2021年第6期33卷 169-181页

作者： Dan Yao Guiqian Tang Yinghong Wang Yuan Yang Lili Wang Tianzeng Chen Hong He Yuesi Wang Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

High values of ozone(O_(3))occur frequently in the dry spring season;thus,understanding the evolution characteristics of volatile organic compounds(VOCs)in spring is of great significance for preventing O_(3)*** this study,a total of 101 VOCs from April 16 to May 21,2019,were quantified using an online gas chromatography mass spectrometer/flame ionization detector(GCMS/FID).The results indicated that the observed concentration of total VOCs(TVOCs)was 30.4±17.0 ppbv,and it was dominated by alkanes(44.3%),followed by oxygenated VOCs(OVOCs)(17.4%),halocarbons(12.7%),aromatics(9.5%),alkenes(8.2%),acetylene(5.3%)and carbon disulfide(2.5%).The average mixing ratio of VOCs showed obvious diurnal variation(high at night,low during daytime).We conducted a source apportionment study based on 32 major VOCs using positive matrix factorization(PMF),and coal+biomass burning(25.2%),diesel exhaust(16.0%),gasoline exhaust+evaporation(17.4%),secondary+long-lived species(16.7%),biogenic sources(4.3%),industrial emissions(9.3%)and solvent use(11.2%)were identified as major sources of *** addition to local emissions,most of the atmospheric VOCs were derived from long-distance air masses(65.7%),and the average mixing ratio of VOCs in the northwest direction was 29.4 *** with the results of the potential source contribution function(PSCF)indicate that research should focus on the local emissions of combustion,transportation sources and solvents usage to control atmospheric ***,transmission of the northwest air mass is an important component that cannot be ignored during spring in Beijing.

关键词： VOCs Source apportionment Beijing Spring Northwest transport

来源：评论

学校读者我要写书评

暂无评论

A global perspective on e-waste recycling

Circular Economy

引用

Circular Economy 2023年第1期2卷

作者： Liu, Kang Tan, Quanyin Yu, Jiadong Wang, Mengmeng State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom KowloonHong Kong China

Electronic waste (e-waste) is one of the relatively fast-growing solid waste streams, with an annual growth rate of 3%–5%. Although international policies have been formulated to better limit the global transboundary movement of hazardous waste, the existence of illegal trade and "informal" recycling has exacerbated the global recycling of e-waste. At present, residents in many low-income areas are still illegally and unscientifically disposing of e-waste to profit from it. The toxic and harmful substances produced affect the global ecological environment through the geochemical cycle. In this review, we provide a systematic overview of the status quo of e-waste recycling globally. E-waste is placed into a framework, grouped by product type, quantity, composition, environmental health risk, and global impact. Management measures, legislative policies, current disposal, and transboundary movement are summarized at international, regional, and national levels, illustrating the status and challenges of e-waste collection and disposal. Techniques such as physical dismantling, component recycling, metal extraction, and re-utilization of non-metallic materials are described, which can have long-term impact on the ecosystem. We advocate that the global sustainable recycling of e-waste be supported by regional cooperation, legislative management, technology development, and eco-friendly design. This study provides a global solution for the recycling of e-waste. © 2023 The Author(s)

关键词： Electronic Waste

来源：评论

学校读者我要写书评

暂无评论

Insights into the Full Cycling of Oxygen in Vocs Oxidation on Α-Mno2: A Nap-Xps Study

SSRN

引用

SSRN 2023年

作者： Luo, Sai Zhao, Xiaoguang Qu, Yakun Wang, Lixin Zhou, Bin Si, Wenzhe Fang, Wei Sinopec Research Institute of Petroleum Processing Co. Ltd Beijing100083 China State Key Joint Laboratory of Environment Simulation and Pollution Control Beijing100084 China

α-MnO2-based catalysts are promising materials for VOC oxidation, and understanding how oxygen participates in the reaction is crucial for further improving its catalytic performance. Despite providing many insightful results, oxygen vacancy characterization cannot fully explain the oxygen cycling process, giving sometimes insufficient interpretations. Furthermore, the difficulty in differentiating the effects of multiple structural factors on oxygen capture, activation, and migration makes in situ characterization even more imperative. Under reaction conditions, NAP-XPS enabled us to directly investigate the trend of catalyst elemental migration and change in surface electronic properties. With DFT calculation, EELS, and specially designed O2-TPD characterization, we further demonstrated that activation of molecular oxygen and replenishment of oxygen vacancies affect the catalytic oxidation of several typical VOCs variously. This work deepens the understanding of the intrinsic structure of α-MnO2 and paves the way for the rational development of novel and versatile VOC oxidation catalysts. © 2023, The Authors. All rights reserved.

关键词： X ray photoelectron spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Unraveling climate change-induced compound low-solar-low-wind extremes in China

引用

国家科学评论（英文版） 2025年第1期12卷 92-105页

作者： Licheng Wang Yawen Liu Lei Zhao Xi Lu Liangdian Huang Yana Jin Steven J.Davis Amir Aghakouchak Xin Huang Tong Zhu Yue Qin College of Environmental Sciences and Engineering Peking UniversityBeijing 100871China Institute of Carbon Neutrality Peking UniversityBeijing 100871China School of Atmospheric Sciences Nanjing UniversityNanjing 210023China Department of Civil and Environmental Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA National Center for Supercomputing Applications University of Illinois at Urbana-ChampaignUrbanaIL 61801USA School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing 100084China Department of Earth System Science University of CaliforniaIrvineIrvineCA 92697USA Department of Earth System Science University of CaliforniaIrvineIrvineCA 92697USA Department of Civil and Environmental Engineering University of CaliforniaIrvineIrvineCA 92697USA

China's pursuit of carbon neutrality targets hinges on a profound shift towards low-carbon energy,primarily reliant on intermittent and variable,yet crucial,solar and wind power *** particular,low-solar-low-wind(LSLW)compound extremes present a critical yet largely ignored threat to the reliability of renewable electricity *** existing studies have largely evaluated the impacts of average climate-induced changes in renewable energy resources,comprehensive analyses of the compound extremes and,particularly,the underpinning dynamic mechanisms remain *** we show the dynamic evolution of compound LSLW extremes and their underlying mechanisms across China via coupling multi-model simulations with diagnostic *** results unveil a strong topographic dependence in the frequency of compound LSLW extremes,with a national average frequency of 16.4(10th-90th percentile interval ranges from 5.3 to 32.6)days/yr,when renewable energy resources in eastern China are particularly compromised(～80％lower than that under an average climate).We reveal a striking increase in the frequency of LSLW extremes,ranging from 12.4％under SSP126 to 60.2％under SSP370,primarily driven by both renewable energy resource declines and increasingly heavily-tailed distributions,resulting from weakened meridional temperature(pressure)gradient,increased frequency of extremely dense cloud cover and additional distinctive influence of increased aerosols under *** study underscores the urgency of preparing for significantly heightened occurrences of LSLW events in a warmer future,emphasizing that such climate-induced compound LSLW extreme changes are not simply by chance,but rather projectable,thereby underscoring the need for proactive adaptation *** insights are crucial for countries navigating a similar transition towards renewable energy.

关键词： wind energy solar energy renewable energy climate change compound energy droughts

来源：评论

学校读者我要写书评

暂无评论

Micro-nanobubble–assisted As(III) removal from water by Ni-doped MOF materials

引用

environmental Science and pollution Research 2024年第31期31卷 43913-43926页

作者： Ye, Jian Zuo, Yize Chen, Qiang Yang, Zhiming Liu, Shaobo Yang, Chunping Tan, Xiaofei Hunan University Changsha410082 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Shenzhen Research Institute of Hunan University Shenzhen518055 China School of Architecture and Art Central South University Changsha410083 China Academy of Environmental and Resource Sciences School of Environmental Science and Engineering Guangdong University of Petrochemical Technology Guangdong Maoming525000 China Hunan Chuke Taiyan New Materials Co. Ltd. Jishou416000 China

Micro-nanobubbles (MNBs) can form reactive oxygen species (ROS) with high oxidizing potential. In this study, nickel-doped metal–organic framework materials (MOFs) capable of activating molecular oxygen were synthesized using trivalent arsenic (As(III)) as a target pollutant and combined with peroxymonosulfate (PMS) to construct a MOF/MNB/PMS system. The results included the rapid oxidation of As(III), the successful absorption of oxidized As(V), and finally the efficient removal of As. The effects of pH, amount of PMS used, and preparation time of MNBs on the As removal performance of the MOF/MNB/PMS system were investigated experimentally. The changes in the properties of the materials before and after the reaction were analyzed by XPS, and it was found that the main active sites on the surface of the MOFs were the metal elements and the pyridine nitrogen near the carbon atom. The regular morphology and elemental composition of the MOFs were determined by TEM scanning and EDS test, which indicated the presence of nickel. XRD tests before and after the reaction showed that the MOFs were structurally stable. The results of the free radical burst experiments show that the single linear oxygen (1O2) is the main active substance in the system, and that the MNBs are key factors by which the system achieves efficient oxidation performance. In addition to providing a sustainable supply of molecular oxygen to the MOFs during the reaction process, coupling the MNBs with PMS was found to improve the oxidation capacity of the system. The results of this study thus provide a new concept for As removal and advanced oxidation in water bodies. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Molecular oxygen

来源：评论

学校读者我要写书评

暂无评论

Water quality prediction of copper-molybdenum miningbeneficiation wastewater based on the PSO-SVR model

引用

Frontiers of environmental Science & Engineering 2023年第8期17卷 81-94页

作者： Xiaohua Fu Qingxing Zheng Guomin Jiang Kallol Roy Lei Huang Chang Liu Kun Li Honglei Chen Xinyu Song Jianyu Chen Zhenxing Wang Ecological Environment Management and Assessment Center Central South University of Forestry and TechnologyChangsha 410004China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental SciencesMinistry of Ecology and EnvironmentGuangzhou 510655China Chinese Non-Ferrous Industrial Engineering Center of Pollution Control Technology&Equipment Science Environment Protection Co.Ltd.Changsha 410036China Institute of Computer Science University of TartuTartu 51009Estonia School of Environmental Science and Engineering Guangzhou UniversityGuangzhou 510006China A.B Freeman School of Business Tulane UniversityNew OrleansLA 70118USA Guangzhou Huacai Environmental Protection Technology Co. Ltd.Guangzhou 511480China

The mining-beneficiation wastewater treatment is highly complex and *** factors like influent quality,flow rate,pH and chemical dose,tend to restrict the effluent effectiveness of miningbeneficiation wastewater *** oxygen demand(COD)is a crucial indicator to measure the quality of mining-beneficiation *** COD concentration accurately of miningbeneficiation wastewater after treatment is essential for achieving stable and compliant *** reduces environmental risk and significantly improves the discharge quality of *** paper presents a novel AI algorithm PSO-SVR,to predict water *** optimization of our proposed model PSO-SVR,uses particle swarm optimization to improve support vector regression for COD *** generalization capacity tested on out-of-distribution(OOD)data for our PSOSVR model is strong,with the following performance metrics of root means square error(RMSE)is 1.51,mean absolute error(MAE)is 1.26,and the coefficient of determination(R2)is *** compare the performance of PSO-SVR model with back propagation neural network(BPNN)and radial basis function neural network(RBFNN)and shows it edges over in terms of the performance metrics of RMSE,MAE and R2,and is the best model for COD prediction of mining-beneficiation *** is because of the less overfitting tendency of PSO-SVR compared with neural network *** proposed PSO-SVR model is optimum for the prediction of COD in copper-molybdenum mining-beneficiation wastewater *** addition,PSO-SVR can be used to predict COD on a wide variety of wastewater through the process of transfer learning.

关键词： Chemical oxygen demand Mining-beneficiation wastewater treatment Particle swarm optimization Support vector regression Artificial neural network

来源：评论

学校读者我要写书评

暂无评论

Surface-Air Exchanges of H2s and So2 in an Urban Wetland in Eastern China

SSRN

引用

SSRN 2024年

作者： Yu, Qian Wang, Wenjia Chang, Jiale Li, Han Zhang, Zimeng Ke, Piaopiao Duan, Lei Zhang, Lei Zhao, Yu State Key Laboratory of Pollution Control & Resource Reuse School of Environment Nanjing University Nanjing China / Physics Faculty of Science University of Helsinki Helsinki00014 Finland State Key Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing China Nanjing University of Information Science and Technology Nanjing China

Wetlands are widely recognized as major natural sources of hydrogen sulfur (H2S), an important biological sulfur gas that significantly affects atmospheric SO42- aerosol formation and climate change. With the expansion of urban wetlands, it is critical to know the roles that urban wetlands played in atmospheric H2S and SO2 budget. SO2 have higher concentrations in urban regions. In this study, the surface-air exchange fluxes of H2S and SO2 were measured by the Dynamic Flux Chamber (DFC) method in a typical urban wetland in eastern China from Sep 2022 to July 2023. It was found that the urban wetland did not have the expected high H2S emission, might be caused by the relatively high pH value and low sulfate concentration in the wetland. Although H2S showed emission in the daytime of spring and summer, an overall H2S flux of -0.04 kg S ha-1 yr-1 was observed throughout the year. Meanwhile, the urban wetland presented a net sink of SO2, with the deposition reaching 0.14 kg S ha-1 yr-1. The flux of SO2 was significantly negatively correlated with SO2 concentration in the air and negative peaks of SO2 flux corresponded to the suddenly elevated SO2 concentration in the ambient air especially in spring and winter. Through linear fitting of SO2 flux and concentration, the concept of SO2 "compensation point" was proposed. The "compensation point" in summer and autumn were larger, being 2.37 ppb and 1.40 ppb, respectively, and they were 1.07 ppb and 0.86 ppb in spring and winter respectively. The compensation point changed with the season and was related to temperature, and humidity. Our results suggest that the urban wetland expansion may have little risk of increasing air H2S but could act as a significant sink of SO2 with high SO2 concentration in the urban region. © 2024, The Authors. All rights reserved.

关键词： Sulfur compounds

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：