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Mxene-Supported Mil-88a(Fe) as Persulfate Activator for Removal of Tetracycline

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SSRN 2023年

作者： Chen, Junxia Li, Weigang Yang, Zhenzhen Yang, Yuying Zhou, Qing State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China

The poor conductivity，poor stability and agglomeration in water of MIL-88A(Fe) limit its application as persulfate (PS) activator in water purification. Herein, MXene-supported MIL-88A(Fe) composites(M88A/KMX) were synthe-sized to enhance its adsorption and catalytic capability for tetracycline (TC) removal. M88A/KMX-0.2 composites exhibits optimal degradation efficiency，reaching 98% under conditions of 0.2 g/L M88A/KMX-0.2, 1.0 mM PS, 20 ppm TC, and pH 5. The degradation rate constants of M88A/KMX-0.2 was 0.03217 min-1, which was much higher than that of MIL-88A (0.00159 min-1) and MXene (0.00626 min-1). The removal effects of reaction parameters, such as dosage of M88A/KMX-0.2 and PS, initial solution pH and the presence of the common co-existing constituents (humic acid and the inorganic anions) were investi-gated in detail. Additionally, the reuse of M88A/KMX-0.2 showed that the com-posites had good cycling stability. The results of electron paramagnetic reso-nance (EPR) and quenching experiments indicated that ·OH , ·SO4- and·O2- were involved in the M88A/KMX-0.2/PS system. This study offered a new avenue for sulfate-based degradation of Fe-based metal organic frame-work. © 2023, The Authors. All rights reserved.

关键词： Degradation

A Homogeneous Reagent for Ni2+ Capture from Wastewater: The Fast Removal Kinetics, Phase Transition Mechanism and Impact Evaluation for Aerobic Sludge

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SSRN 2022年

作者： Zhang, Shun Miao, Shiyu An, Xiaoqiang Lan, Huachun 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

Heterogeneous process with low mass transfer rate is limited in the treatment of large-volume Ni-contained wastewater. The homogeneous reaction provides a promising strategy to solve this problem, but phase transition process of Ni 2+ removal and its potential impact on activated sludge system are rarely explored. Herein, the Ni 2+ removal efficiency and process were firstly investigated in detail by using S-containing reagents with dithioamino groups. When the dosage of reagent concentration was controlled at 5-10:1(Ni), the Ni 2+ can be rapidly and completely removed within 1 min. Additionally, other coexisting Cu 2+ , Co 2+ , Cd 2+ and Pb 2+ could be synchronously removed with more reagent adding, while the typical organics (e.g. humic/citric acid) in water and high concentration of chemical oxygen demand (3800 mg L -1 ) in actual water, exhibited negligible inhibition for Ni 2+ capture. The phase transition was visually investigated by charge coupled device camera and paticle size change. Experimental characterizations demonstrated that dithioamino groups in capture reagent could efficiently chelate with Ni 2+ , which was validated by theoretical calculations. Vitally, the treatment by reagents cannot affect the nitrification activity of aerobic sludge system through short-term experiment and 29 months of operation while ensuring total Ni removal effect. These findings highlight opportunities for using S-containing organic reagents to remove heavy metal ions from wastewater, particularly in sewage treatment plant with bulky water. © 2022, The Authors. All rights reserved.

关键词： Particle size

Resolving the Contradiction Caused by Water-Lean Solvent Through a Split-Flow Heat Exchange Strategy Toward Efficient Carbon Dioxide Capture

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SSRN 2023年

作者： Zhan, Guoxiong Yuan, Bingling Duan, Yuanmeng Chen, Zhen Chen, Jianjun Li, Junhua State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Department of Chemical and Biochemical Engineering Technical University of Denmark Kgs Lyngby2800 Denmark

Amine-based chemisorption technology with water-lean solvent is a promising route towards low-cost CO2 capture. However, the low heat capacity of water-lean solvent makes efficient heat exchange through the traditional technology challenging, causing difficulty solvent regeneration. This paper proposes split-flow heat exchange strategy for CO2-rich solvent to reduce external steam consumption and increase the regeneration temperature. Optimized water-lean amine-based solvent, composed of blend amines and physical solvent, was employed and its CO2 capture performance analyzed for a bench-scale continuous system. A rigorously validated process simulation method is proposed for operational optimization and comprehensive economic, exergy, environment, energy analysis of the capture process on an industrial scale. The experimental and simulation results indicated that the optimal ratio of split-flow was 0.55-0.7, with this ratio resulting in the reflux temperature increasing from 90 to 110 °C. The proportion of total energy duty that went to reaction heat was increased to 80% from 61% in the benchmark case;this increase was ascribed to the synergistic promotion of physical solvent and split-flow heat exchange strategy. The water-lean solvent could operate at a regeneration duty of 2.07 GJ/t CO2 with a total capture cost of US $50.40/t CO2 (27% lower than the benchmark value) from coal-fired flue gas. In summary, the net CO2 reduction can be increased by 32%, taking the utility heat-cold consumption into account. This research indicates a feasible method of taking full advantage of water-lean solvent to achieve efficient CO2 capture. © 2023, The Authors. All rights reserved.

关键词： Energy utilization

Multivariate optimization of characteristic parameters of continuous-flow system with a front buffer tank for industrial reverse osmosis concentrate treatment

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Chemosphere 2023年第1期336卷 139078页

作者： Li, Shida Zeng, Fantang Zheng, Shaokui Fan, Zhongya Huang, Lu The Key Laboratory of Water and Air Pollution Control of Guangdong Province South China Institute of Environmental Sciences Ministry of Ecology and Environment No. 18 Ruihe Road Guangzhou510530 China School of Environment MOE Key Laboratory of Water and Sediment Sciences/State Key Lab of Water Environment Simulation Beijing Normal University Beijing100875 China

Industrial reverse osmosis concentrate (ROC) was electrochemically oxidized using a continuous-flow system (CFS) with a front buffer tank. Multivariate optimization including Plackett-Burman (PBD) and central composite design based on response surface method (CCD-RSM) was implemented to investigate the effects of characteristic (e.g., recirculation ratio (R value), ratio of buffer tank and electrolytic zone (RV value)) and routine (e.g., current density (i), inflow linear velocity (v) and electrode spacing (d)) parameters. R, v values and current density significantly influenced chemical oxygen demand (COD) and NH4+−N removal and effluent active chlorine species (ACS) level, while electrode spacing and RV value had negligible effects. High chloride content of industrial ROC facilitated the generation of ACS and subsequent mass transfer, low hydraulic retention time (HRT) of electrolytic cell improved the mass transfer efficiency, and high HRT of buffer tank prolonged the reaction between the pollutants and oxidants. The significance levels of COD removal, energy efficiency, effluent ACS level and toxic byproduct level CCD-RSM models were validated by statistical test results, including higher F value than critical effect value, lower P value than 0.05, low deviation between predicted and observed values, and normal distribution of calculated residuals. The highest pollutant removal was achieved at a high R value, a high current density and a low v value;the highest energy efficiency was achieved at a high R, a low current density and a high v value;the lowest effluent ACS and toxic byproduct levels were achieved at a low R value, a low current density and a high v value. Following the multivariate optimization, the optimum parameters were decided to be v = 1.2 cm h−1, i ≥ 8 mA cm−2, d ≥ 4, RV = 10−20 and R = 1 to achieve better effluent quality (i.e., lower effluent pollutant, ACS and toxic byproduct levels). © 2023 Elsevier Ltd

关键词： Effluents

Microbial Diversity and Metabolic Pathways Linked to Benzene Degradation in Petrochemical-Polluted Groundwater

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SSRN 2024年

作者： Zhang, Ruihuan Ye, Zhencheng Guo, Xue Yang, Yunfeng Li, Guanghe State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Institute of Environment and Ecology Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China

The rapid advance in shotgun metagenome sequencing has enabled us to identify uncultivated functional microorganisms in polluted environments. While aerobic petrochemical-degrading pathways have been extensively studied, the anaerobic mechanisms remain less explored. Here, we conducted a study at a petrochemical-polluted groundwater site in Henan Province, Central China. A total of twelve groundwater monitoring wells were installed to collect groundwater samples. Benzene appeared to be the predominant pollutant, detected in 10 out of 12 samples and with concentrations ranging from 1.4 μg/L to 5,830 μg/L. Due to the low aquifer permeability, pollutant migration occurred slowly, resulting in relatively low benzene concentrations downstream within the heavily polluted area. Deep metagenome sequencing revealed Proteobacteria as the dominant phylum. Microbial diversity was low in heavily polluted samples, with community compositions substantially differing from those in lightly polluted samples. dmpK encoding the phenol/toluene 2-monooxygenase was detected across all samples, suggesting that aerobic benzene degradation might occur through monooxygenation. Catechol produced through benzene hydroxylation was preferentially transformed into 2-hydroxymuconate semialdehyde via catechol 2,3-dioxygenase (dmpB) catalysis, rather than conversion to cis,cis-muconate by catechol 1,2-dioxygenase (catA). Sequence assembly and binning yielded 350 high-quality metagenome-assembled genomes (MAGs), with 30 MAGs harboring functional genes associated with aerobic or anaerobic benzene degradation. About 80% of MAGs harboring functional genes associated with anaerobic benzene degradation remained taxonomically unclassified at the genus level, suggesting that our current database coverage of anaerobic benzene-degrading microorganisms is very limited. Furthermore, two genes integral to anaerobic benzene metabolism, i.e, benzoyl-CoA reductase (bamB) and glutaryl-CoA dehydrogenase (acd), were no

关键词： Benzene

Synergetic roadmap of carbon neutrality and clean air for China

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environmental Science and Ecotechnology 2023年第4期16卷 1-25页

作者： Qiang Zhang Zhicong Yin Xi Lu Jicheng Gong Yu Lei Bofeng Cai Cilan Cai Qimin Chai Huopo Chen Hancheng Dai Zhanfeng Dong Guannan Geng Dabo Guan Jianlin Hu Cunrui Huang Jianing Kang Tiantian Li Wei Li Yongsheng Lin Jun Liu Xin Liu Zhu Liu Jinghui Ma Guofeng Shen Dan Tong Xuhui Wang Xuying Wang Zhili Wang Yang Xie Honglei Xu Tao Xue Bing Zhang Da Zhang Shaohui Zhang Shaojun Zhang Xian Zhang Bo Zheng Yixuan Zheng Tong Zhu Jinnan Wang Kebin He Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System ScienceTsinghua UniversityBeijing100084China Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing210044China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Institute for Carbon Neutrality Tsinghua UniversityBeijing100084China State Key Joint Laboratory for Environment Simulation and Pollution Control College of Environmental Sciences and Engineering and Center for Environment and HealthPeking UniversityBeijing100871China Center of Air Quality Simulation and System Analysis Chinese Academy of Environmental PlanningBeijing100012China Center for Carbon Neutrality Chinese Academy of Environmental PlanningBeijing100012China National Center for Climate Change Strategy and International CooperationBeijing100035China Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China College of Environmental Sciences and Engineering Peking UniversityBeijing100871China Institute of Environmental Policy Management Chinese Academy of Environmental PlanningBeijing100012China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and EngineeringCollaborative Innovation Center of Atmospheric Environment and Equipment TechnologyNanjing University of Information Science and TechnologyNanjing210044China Vanke School of Public Health Tsinghua UniversityBeijing100084China Center for Energy and Environmental Policy Research Beijing Institute of TechnologyBeijing100081China China CDC Key Laboratory of Environment and Population Health National Institute of En

It is well recognized that carbon dioxide and air pollutants share similar emission sources so that synergetic policies on climate change mitigation and air pollution control can lead to remarkable co-benefits on greenhouse gas reduction,air quality improvement,and improved *** the context of carbon peak,carbon neutrality,and clean air policies,this perspective tracks and analyzes the process of the synergetic governance of air pollution and climate change in China by developing and monitoring 18 *** 18 indicators cover the following five aspects:air pollution and associated weather-climate conditions,progress in structural transition,sources,inks,and mitigation pathway of atmospheric composition,health impacts and benefits of coordinated control,and synergetic governance system and *** tracking the progress in each indicator,this perspective presents the major accomplishment of coordinated control,identifies the emerging challenges toward the synergetic governance,and provides policy recommendations for designing a synergetic roadmap of Carbon Neutrality and Clean Air for China.

关键词： Carbon neutrality Clean air Synergetic roadmap

Flame-Made High-Capacity and High Efficient Nanomaterial Wo3-Ceox-Cuo/Tio2 for Mercury Adsorption

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SSRN 2023年

作者： Sen, Shao Li, Guoliang You, Xiaoqing Wang, Shuxiao Key Laboratory for Thermal Science and Power Engineering Ministry of Education Tsinghua University Beijing100084 China Center for Combustion Energy Tsinghua University Beijing100084 China 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

High-concentration mercury capture at high temperatures is a big challenge for cement clinker production during the periodical shutdown period of raw meal mill. This study synthesized nanomaterials WO3-CeOx-CuO/TiO2 for mercury removal by both wet impregnation and flame synthesis. The performance of the synthesized sorbents is evaluated for mercury removal at 450 °C, which is above the typical temperature at raw meal shutdown conditions. It is found that the adsorption efficiency of the flame-synthesized sorbent remains above 95% after 30 days of absorption, while the sorbent synthesized by wet impregnation gets saturated after 50 hours. To understand the adsorption mechanism, the physicochemical properties of the sorbents including surface area, pore volume and average pore diameter, phase composition, morphology, valence states of surface elements are characterized by N2 adsorption isotherm, transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy (XPS) separately. The results show that the flame-synthesized sorbent has a larger specific surface area and smaller primary particle sizes than the sorbent by wet impregnation. In addition, Cu atoms are dispersed in the flame-synthesized sorbent while CuO clusters are supported on CeO2 in the sorbent by wet impregnation. Based on the XPS results, it can be found that the oxidizing species is the adsorbed molecular oxygen from environment for flame-synthesized sorbent but surface active oxygen (Oβ) is consumed for the sorbent synthesized by the impregnation method. © 2023, The Authors. All rights reserved.

关键词： Adsorption

Simultaneous removal of Pb and MTBE by mixed zeolites in fixed-bed column tests

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Journal of environmental Sciences 2022年第12期34卷 41-49页

作者： Yunhui Zhang FeiWang Benyi Cao Hailong Yin Abir Al-Tabbaa College of Environmental Science and Engineering Tongji UniversityShanghai 200092China Key Laboratory of Yangtze River Water Environment Ministry of EducationTongji UniversityShanghai 200092China Department of Engineering University of CambridgeCambridgeCB21PZUK Institute of Geotechnical Engineering School of TransportationSoutheast UniversityNanjing 210096China State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control Nanjing Institute of Environmental SciencesMinistry of Ecology and Environment of ChinaNanjing 210042China

The co-contamination of metals and organic pollutants,such as Pb and methyl tert-butyl ether(MTBE),in groundwater,has become a common and major phenomenon in many contaminated *** study evaluated the feasibility of their simultaneous removal with permeable reactive barrier(PRB)packed with mixed zeolites(clinoptilolite and ZSM-5)using fixed-bed column tests and breakthrough curve *** effect of grain size on the permeability of PRB and removal efficacy was also assessed by granular and power *** replacement of granular clinoptilolite by powder clinoptilolite largely reduced the breakthrough time but increased the saturation time nearly *** column adsorption capacity of clinoptilolite powders almost tripled that of clinoptilolite granules(130.6mg/g versus 45.3 mg/g)due to higher specific surface *** minimum thickness and corresponding longevity of PRB were calculated as 7.12 cm and 321.5 min when 5%of granular clinoptilolite was mixed with 5%ZSM-5 and 90%sand as mixed PRB reactive media compared with 10.86 cm and 1230.2 min for the application of powder *** study is expected to provide theoretical support and guidance for the practical application of mixed adsorbents in PRBs.

关键词： MTBE Zeolite Heavy metal Permeable reactive barrier Groundwater remediation

Biodegradation of Tetracycline by Enriched Bacterial Consortia: Microbial Community Succession and Degradation Characteristics and Mechanism

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SSRN 2022年

作者： Chen, Xiuli Ke, Yanchu Zhu, Ying Xu, Mingbang Chen, Chao Xie, Shuguang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing100871 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Tetracycline (TC) is an emerging pollutant with poor biodegradability and persistent existence. Biodegradation has a tremendous potential for the clean-up of TC residues. In this study, two microbial consortia (named SL and SI) were respectively enriched from activated sludge and soil after more than three months of acclimation. Diversity dramatically decreased in these finally enriched consortia compared with the original microbiotas. Microbial compositions of the two consortia as revealed by 16S rRNA sequencing were similar to some extent, and the dominant genera Pseudomonas, Sphingobacterium, and Achromobacter were identified as the potential TC degraders. In addition, most ARGs quantified during the acclimation process became lower in the finally enriched microbial consortia. Consortia SL and SI were capable of efficiently biodegrading TC by 82.92% and 86.83% within 7 days, respectively. They could retain high degradation capabilities under a wide range of pH (4-10) and moderate/high temperatures (25–40 °C). Peptone with concentrations of 4-10 g/L could serve as a desirable primary growth substrate for consortia to remove TC through co-metabolism. A total of 16 possible intermediates including a novel biodegradation product TP245 were detected during TC degradation. Peroxidases and tetX-like genes as revealed by metagenomic sequencing were likely responsible for TC biodegradation. © 2022, The Authors. All rights reserved.

关键词： Biodegradation