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SSRN 2023年

作者： Li, Kunlin Chen, Xueyan Qin, Xiaoxiao Chen, Min Zhang, Jianghao Li, Kai Wang, Fei Fang, Jinhou Zhang, Changbin State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming650500 China Weifang Research Institute of Materials and Technology for Eco-Environmental Protection Shandong Weifang261300 China

Carbon nanosheets have promising application in desulfurization but are challenged by high cost and cumbersome preparation process. In this work, carbon nanosheets composited with CaO and MgO (MgxCay/C) were fabricated by one-step co-pyrolysis of magnesium gluconate and calcium gluconate. This carbon nanosheets material enables the efficient room temperature H2S oxidation in a moist atmosphere. The characterization results indicate that this co-pyrolysis strategy produces defect-rich carbon nanosheets with uniformly distributed oxides nanoparticles for the adsorption and activation of H2S as well as O2. Significantly, numerous nanoholes with a size of 5-20 nm are obtained on the carbon nanosheets, which serve as S storage space to form S polymer resistant to further oxidation, inhibiting the formation of H2SO4 and its subsequent consumption of active components. As a result, the MgxCay/C shows a tremendous H2S capacity of 858.5 mg/gcat.. In addition, the processes of H2S oxidation over the MgxCay/C and its deactivation are also detailly illustrated. This study contributes to providing a low-cost and facile preparation approach for carbon nanosheets in desulfurization and other diverse applications. © 2023, The Authors. All rights reserved.

关键词： Room temperature

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Significance and Enlightenment of Implementing Water Ecological Assessment

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Water & Ecology 2025年第1期1卷

作者： Jiuhui Qu Jianfeng Peng State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China

The quality of aquatic ecology is a fundamental indicator of the condition of water bodies and their environments. Maintaining the integrity of aquatic ecosystems is essential for the conservation of water resources and the rehabilitation of aquatic habitats. Characterizing and evaluating the health and quality of these ecosystems remains a substantial challenge in international research and exploration of this field. This paper surveys the evolution, index system, change process and difficulties of international practices in aquatic ecological assessment, highlighting the principal experiences and pivotal insights gained from assessments conducted in typical countries and organization around the world, including the United States, the European Union, the United Nation, China, Brazil and India. Research on and application of water ecological assessments have demonstrated significant advancements in technological and methodological approaches, marking a notable transition from general scientific evaluations to more targeted assessments. This evolution also reflects the continuous improvement and refinement of policies and management strategies. However, the identification and measurement of water quality indicators, particularly biological indicators, are crucial to aquatic ecosystems. The biological indicators used currently, such as fish, benthic organisms, plankton, macrophytes, and periphyton, have the problems of excessive assessment variables, testing difficulties, and limited precision in gauging the level of ecological health. Therefore, it is necessary to standardize a set of core indicators and establish a methodological framework that is accurate, easily measurable, and conducive to routine operations. This presents a challenging scientific and technological research topic.

关键词： water ecological assessment indicator factor sustainability three-water-integration

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Chronic Effects of Benzalkonium Chlorides on Short Chain Fatty Acids and Methane Production in Semi-Continuous Anaerobic Digestion of Waste Activated Sludge

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SSRN 2022年

作者： Yang, Chun-Xue He, Zhang-Wei Liu, Wen-Zong Wang, Ai-Jie Wang, Ling Liu, Jia Liu, Bao-Ling Ren, Nan-Qi Yu, Shao-Peng Guo, Ze-Chong Heilongjiang Province Key Laboratory of Cold Region Wetland Ecology and Environment Research School of Geography and Tourism Harbin University Harbin China National Technology Innovation Center of Synthetic Biology Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences Tianjin China Shanxi Key Laboratory of Environmental Engineering Key Laboratory of Northwest Water Resource Environment and Ecology MOE School of Environmental and Municipal Engineering Xi’an University of Architecture and Technology Xi’an China State Key Laboratory of Urban Water Resource and Environment Shenzhen Key Laboratory of Organic Pollution Prevention and Control Harbin Institute of Technology Shenzhen Shenzhen China School of Environmental & Municipal Engineering Qingdao University of Technology Qingdao China School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang China

Benzalkonium chlorides (BACs) are one kind of emerging pollutants in wastewater and potentially enriched in waste activated sludge (WAS) because of its quick adsorption but slow degradation under anaerobic condition, which will impact acidogenesis and methanogenesis in anaerobic digestion (AD). It is worthy to well understand the microbial response mechanism under chronic effects of BACs for resource recovery from WAS. This study investigated the AD (by-)products and microbial evolution under low to high BACs concentrations from bioreactor startup to steady running. It was found that BACs can lead to an increase of WAS hydrolysis and fermentation, but a disturbance to acidogenic bacteria also occurred at low BACs concentration, while a noticeable inhibition to methanogenesis occurred when BAC concentration was up to 15 mg/g TSS. The analysis of metabolic pathways showed that BACs shifted the metabolism of short chain fatty acids (SCFAs), and the improved the propionic acid (HPr) reduction process, while the relative abundance of Clostridium and Longilinea were increased. Furthermore, the functional species involved in methane metabolism had succeeded from aceticlastic methanogens to hydrogenotrophic methanogens, while the abundance of coding genes in converged stage was reduced by BACs, which finally led to a decline in methane production. © 2022, The Authors. All rights reserved.

关键词： Methane

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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

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Carbon Nanosheets Prepared by One-Step Co-Pyrolysis Strategy for Efficient H2s Oxidation at Room Temperature

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SSRN 2023年

Carbon nanosheets have promising application in desulfurization but are challenged by high cost and cumbersome preparation process. In this work, carbon nanosheets composited with CaO and MgO (MgxCay/C) were fabricated by one-step co-pyrolysis of magnesium gluconate and calcium gluconate. This carbon nanosheets material enables the efficient room temperature H2S oxidation in a moist atmosphere. The characterization results indicate that this co-pyrolysis strategy produces defect-rich carbon nanosheets with uniformly distributed oxides nanoparticles for the adsorption and activation of H2S as well as O2. Significantly, numerous nanoholes with a size of 5-20 nm are obtained on the carbon nanosheets, which serve as S storage space to form S polymer resistant to further oxidation, inhibiting the formation of H2SO4 and its subsequent consumption of active components. As a result, the Mg1Ca9/C shows a tremendous H2S capacity of 858.5 mg/gcat.. In addition, the processes of H2S oxidation over the MgxCay/C and its deactivation are also detailly illustrated. This study contributes to providing a low-cost and facile preparation approach for carbon nanosheets in desulfurization and other diverse applications. © 2023, The Authors. All rights reserved.

关键词： Room temperature

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Water-stable aggregation and organic matter stabilisation by native plant Acacia auriculiformis in an early Technosol eco-engineered from Fe-ore tailings

Soil and Environmental Health

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Soil and environmental Health 2024年第4期2卷

作者： Li, Zhen Wu, Songlin Liu, Yunjia Thomsen, Lars You, Fang Wang, Junjian Huang, Yuanfang Huang, Longbin SCNU Environmental Research Institute Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment School of Environment South China Normal University Guangzhou 510006 China Sustainable Minerals Institute The University of Queensland Brisbane 4072 QLD Australia 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 State Key Laboratory of Urban and Regional Ecology Research Centre for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China College of Land Science and Technology China Agricultural University Beijing 100193 China Australian Synchrotron ANSTO Melbourne 3168 VIC Australia

Ecological engineering of Fe-ore tailings into Technosols (or soil-like growth media) offers a promising way to rehabilitate tailings without resorting to natural topsoil from other places. Among key pedogenic processes, soil aggregate formation and organic matter (OM) stabilisation are critical to the development of sustainable Technosols. The colonisation of pioneer plant species highly adaptive to infertile soils and water deficit may act as competent biological drivers to enhance these critical processes involved in Technosol formation. This study aimed to investigate the role of an Australian native plant species, Acacia auriculiformis, in enhancing water-stable aggregate formation and associated OM stabilisation using a pot experiment under glasshouse conditions. The influences of two relevant abiotic processes, including water deficit and phosphorus deficiency, on these key processes were evaluated. A. auriculiformis colonisation enhanced the formation of water-stable aggregates in the early Technosols, while the proportion of macroaggregates and microaggregates were altered differently, with the former increasing under well-watered conditions and the latter increasing under water deficit conditions. A. auriculiformis colonisation increased N-rich mineral-associated OM within the macroaggregates. In aggregates, OM stabilisation was related to interactions of carboxyl-rich organic groups with tailing minerals. The influences of water deficit and phosphorus deficiency on aggregate formation and OM stabilisation were mediated via their impacts on the growth and root functions of A. auriculiformis, including root extension, entanglement, and exudation. From these findings, the utilisation of A. auriculiformis is recommended as a biological driver to facilitate the development of early Technosols from eco-engineered Fe-ore tailings. © 2024 The Author(s)

关键词： Biological N2 fixation Macro-/micro-aggregates Mine site rehabilitation Mineral-associated OM Organic functional group Phosphorus nutrition Pioneer leguminous plants Plant colonisation Root exudates Synchrotron spectroscopy

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Role of Black Carbon in Modulating Aerosol Direct Effects Driven by Air pollution controls During 2013-2017 in China

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SSRN 2022年

作者： Zhang, Fenfen Xing, Jia Ding, Dian Wang, Jiandong Zheng, Haotian Zhao, Bin Qi, Ling Wang, Shuxiao 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 Institute for Atmospheric and Earth System Research Faculty of Science University of Helsinki Helsinki00014 Finland School of Atmospheric Physics Nanjing University of Information Science and Technology Nanjing210044 China School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing100083 China

Aerosol direct effects (ADEs) can modulate shortwave radiation as well as atmospheric dynamics and air quality. As the key absorbing component of aerosol, the black carbon (BC) largely determines the aerosol optical properties. Therefore, it is expected that BC emission controls might gain co-benefits from the simultaneous reduction of ADEs. To demonstrate such synergy, we quantified the ADEs changes and role of BC controls in China during 2013-2017 using a regional two-way coupled meteorology chemistry transport model. Results suggest that the control action effectively reduced wintertime PM2.5 concentration (-26.0 μg m-3) and associated ADEs. The influence of ADEs on surface shortwave radiation, 2-meter temperature, and planetary boundary layer height was weakened from -16.7 W m-2, -0.20°C, and -15.4 m in 2013 to -11.3 W m-2, -0.06°C, and -10.7 m in 2017, respectively. The enhancement of SO2, NO2, and PM2.5 concentrations due to ADEs was reduced from +3.1%, +5.2%, and +5.4% in 2013, to +2.6%, +4.5%, and +3.3% in 2017, respectively, demonstrating the extra benefit of air pollution controls by reducing ADEs. The BC emission reduced by 12.5% simultaneously along with the effective controls during 2013-2017. Such BC controls contributes 15.6-60.2% of such changes in the ADEs influence on meteorological variables, and 32.6-41.1% on air pollutants. More specially, the effectiveness of collaborative reduction of BC further reduced surface shortwave radiation in China by 3.6 W m-2 in January and 1.0 W m-2 in July, leading to a more weakened ADEs that bring extra benefits in reducing PM2.5 concentrations by 1.8 μg m-3 in January and 0.3 μg m-3 in July. Apparently, BC played a dominant role in modulating the ADEs and associated influences on meteorology and air quality, suggesting a wise control strategy by targeting absorbing component of PM2.5 reduction to address both air pollution and climate change in the future. © 2022, The Authors. All rights reserved.

关键词： Air quality

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Distinct microbial characteristics of the robust single-stage coupling system during the conversion from anammox-denitritation to anammox-denitratation patterns

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Chemosphere 2024年 351卷 141231页

作者： Wang, Depeng Zhang, Yujie Jiang, Ruiming Wang, Wuqiang Li, Jialei Huang, Kailong Zhang, Xu-Xiang State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing 210023 China Institute of Environmental Research at Greater Bay/ Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of Education Guangzhou University Guangzhou 510006 China Nanjing Jiangdao Institute of Environmental Research Co. Ltd. Nanjing 210019 China LingChao Supply Chain Management Co. Ltd. Shenzhen 518000 China

Simultaneous anammox-denitrification is effectively operated in two types, i.e., the anammox-denitritation (SAD pattern) and the anammox-denitratation (PDA pattern). The nitrate derived from inevitable nitrite oxidization likely determines the practical operational pattern of the coupling system, while little information is available regarding the microbial characteristics during the pattern conversion. Here, the single-stage bioreactor coupling anammox with denitrification was operated under conditions with a changed ratio of influent nitrite and nitrate. Results showed that the bioreactor exhibited a robust performance during the conversion from SAD to PDA patterns, corresponding with the total nitrogen removal efficiency ranging from 89.5% to 92.4%. Distinct community structures were observed in two patterns, while functional bacteria including the genera Denitratisoma, Thauera, Candidatus Brocadia, and Ca. Jettenia steadily co-existed. Meanwhile, the high transcription of hydrazine synthase genes demonstrated a stable anammox process, while the up-regulated transcription of nitrite and nitrous oxide reductase genes indicated that the complete denitrification process was enhanced for total nitrogen removal during the PDA pattern. Ecologically, stochastic processes dominantly governed the community assembly in two patterns. The PDA pattern improved the interconnectivity of communities, especially for the cooperative behaviors between dominant denitrifying bacteria and low-abundant species. These findings deepen our understanding of the microbial mechanism underlying the different patterns of the coupling system and potentially expand its engineering application. © 2024

关键词： Anammox-denitratation Anammox-denitritation Community assembly Functional gene Microbial network

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Trickling filter in a biocathode microbial fuel cell for efficient wastewater treatment and energy production

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Science China(Technological Sciences) 2019年第10期62卷 1703-1709页

作者： CAO Xin LIANG Peng SONG XinShan WANG YuHui Qiu Yong HUANG Xia State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Scienceand EngineeringDonghua UniversityShanghai201620China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China

Aiming to reduce the energy input, oxygen supply by trickling filter was employed in a biocathode microbial fuel cell(MFC) to examine its performance of electricity production and sewage treatment. During batch operation, trickling MFC(TMFC) could start and aerate effectively(DO>3.60 mg/L). During continuous operation, TMFC produced a maximum current density of 71.8 A/m^3 and maximum power density of 26.2 W/m^3 under the hydraulic retention time(HRT) of 10 h. By increasing the HRT to 15 h, 90.6% of COD and 99.0% of ammonia in simulated domestic sewage were efficiently removed and the maximum power density was 19.4 W/m^3. Continuous purification of real municipal wastewater achieved 85.9% of COD removal rate and 91.6%of ammonia removal rate. Sequencing result of biocathodic microorganisms indicated that it consisted of four major classes and the dominant class was γ-proteobacteria, which accounted for up to 84.38%. The dominant genus was Acinetobacter, which accounted for 57.81%. The phylogenetic tree showed different relationships among the 19 species of biocathode microorganisms and the predominant species was Acinetobacter calcoaceticus.

关键词： microbial fuel cell biocathode trickling filter electricity generation sewage purification

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Strikingly distinctive NH3-SCR behavior over Cu-SSZ-13 in the Presence of NO2

Research Square

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Research Square 2021年

作者： Shan, Yulong He, Guangzhi Du, Jinpeng Sun, Yu Liu, Zhongqi Fu, Yu Liu, Fudong Shi, Xiaoyan Yu, Yunbo He, Hong Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Department China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environment Sciences Chinese Academy of Sciences China Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences China University of Central Florida United States State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences China Research Center for Eco-Environmental Sciences Chinese Academy of Sciences China

Commercial Cu-exchanged small-pore SSZ-13 (Cu-SSZ-13) zeolite catalysts are highly active for the selective catalytic reduction (SCR) of NOx with NH3, but distinct from other catalyst systems, their activity is unexpectedly inhibited in the presence of NO2. Here, we combined kinetic experiments, in-situ/operando X-ray absorption spectroscopy, and density functional theory (DFT) calculations to obtain direct evidence that under reaction conditions, strong oxidation by NO2 forces Cu ions to exist mainly as fixed framework Cu2+ species (fw-Cu2+), which impede the formation of dynamic binuclear Cu+ species that serve as the main active sites for the standard SCR (SSCR) reaction. As a result, the SSCR reaction is significantly inhibited by NO2 in the zeolite system, and the NO2-involved SCR reaction occurs with an energy barrier higher than that of the SSCR reaction on dynamic binuclear sites. Moreover, the NO2-involved SCR reaction tends to occur at the Brønsted acid sites (BAS) rather than the fw-Cu2+ sites. This work clearly explains the strikingly distinctive selective catalytic behavior in the zeolite system. © 2021, CC BY.

关键词： Zeolites

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