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Machine learning and theoretical analysis release the non-linear relationship among ozone,secondary organic aerosol and volatile organic compounds

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Journal of environmental Sciences 2022年第4期34卷 75-84页

作者： Feng Wang Zhongcheng Zhang Gen Wang Zhenyu Wang Mei Li Weiqing Liang Jie Gao Wei Wang Da Chen Yinchang Feng Guoliang Shi State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control Tianjin Key Laboratory of Urban Transport Emission ResearchCollege of Environmental Science and EngineeringNankai UniversityTianjin 300350China CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research(CLAER) College of Environmental Science and EngineeringNankai UniversityTianjin 300350China State Key Laboratory on Odor Pollution Control Tianjin Academy of Environmental SciencesTianjin 300191China Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution Jinan University Institute of Mass Spectrometry and Atmospheric EnvironmentGuangzhou 510632China Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality Guangzhou 510632China Trusted AI System Laboratory College of Computer ScienceNankai UniversityTianjin 300350China Key Laboratory of Civil Aviation Thermal Hazards Prevention and Emergency Response Civil Aviation University of ChinaTianjin 300300China

Fine particulate matter(PM_(2.5))and ozone(O_(3))pollutions are prevalent air quality issues in *** organic compounds(VOCs)have significant impact on the formation of O_(3)and secondary organic aerosols(SOA)contributing PM_(2.5).Herein,we investigated 54 VOCs,O_(3)and SOA in Tianjin from June 2017 to May 2019 to explore the non-linear relationship among O_(3),SOA and *** monthly patterns of VOCs and SOA concentrations were characterized by peak values during October to March and reached a minimum from April to September,but the observed O_(3)was exactly the *** learning methods resolved the importance of individual VOCs on O_(3)and SOA that alkenes(mainly ethylene,propylene,and isoprene)have the highest importance to O_(3)formation;alkanes(C_(n),n≥6)and aromatics were the main source of SOA *** learning methods revealed and emphasized the importance of photochemical consumptions of VOCs to O_(3)and SOA *** formation potential(OFP)and secondary organic aerosol formation potential(SOAFP)calculated by consumed VOCs quantitatively indicated that more than 80%of the consumed VOCs were alkenes which dominated the O_(3)formation,and the importance of consumed aromatics and alkenes to SOAFP were 40.84%and 56.65%,***,isoprene contributed the most to OFP at 41.45%regardless of the season,while aromatics(58.27%)contributed the most to SOAFP in ***,our findings can provide scientific evidence on policymaking for VOCs controls on seasonal scales to achieve effective reduction in both SOA and O_(3).

关键词： VOCs Machine learning Photochemical consumption Ozone formation potential Secondary organic aerosol formation potential

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

SSRN

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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

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Large-Scale Membrane Bioreactors for Industrial Wastewater Treatment in China:Technical and Economic Features,Driving Forces,and Perspectives

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Engineering 2021年第6期7卷 868-880页

作者： Jiao Zhang Kang Xiao Ziwei Liu Tingwei Gao Shuai Liang Xia Huang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083China Research and Application Center for Membrane Technology School of EnvironmentTsinghua UniversityBeijing 100084China

Membrane bioreactors(MBRs)have been and will continue playing an important role in industrial wastewater treatment and reuse in *** sustainable development of MBR technology in its mature-application stage requires reciprocal interactions between engineering and research ***,in this study,a total of 182 large-scale MBR projects treating industrial wastewater(with individual treatment capacities5000 m3d1)commissioned and under construction from 2003 to 2019 were analyzed *** growth of the cumulative treatment capacity was observed,with extension to diverse industries,and the super large-scale was enhanced *** treatment processes,pollutant removal efficiencies,and actual operational parameters were summarized regarding the particularity of industrial wastewater compared to municipal *** features including the total investment costs of the projects,their total footprint,and their operational energy consumption were analyzed as well.A vigorous MBR market has formed in China with the fast development of membrane elements and engineering suppliers,continuously increasing official oriented projects,and responsive and innovative business *** technology has been mostly applied in specific economic zones and water-deficient areas,but its widespread use all over China is foreseeable considering the vast future market for industrial wastewater treatment and *** policy–economy and market–technology driving forces revealed that MBR is consistent with the national development *** to the survey and analysis,prospective development in both engineering and research aspects of MBR is proposed to maintain its competitive edge.

关键词： Full-scale application Treatment capacity Parameter Footprint Geographic demand Policy

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Formation mechanism and control strategy for particulate nitrate in China

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Journal of environmental Sciences 2023年第1期123卷 476-486页

作者： Haichao Wang Keding Lu Zhaofeng Tan Xiaorui Chen Yuhan Liu Yuanhang Zhang School of Atmospheric Sciences Sun Yat-sen UniversityGuangzhou 510275China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Institute of Energy and Climate Research IEK-8:TroposphereForschungszentrum Jülich GmbHJülich 52428Germany Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China China Institute of Atomic Energy Beijing 100193China

Over the past decade,fine particulate matter(PM)pollution in China has been abated significantly,benefiting from strict emission control measures,but particulate nitrate continues to ***,we review the progress in particulate nitrate(p NO3-)pollution characterization,nitrate formation mechanisms,and the proposed control strategies in *** spatial and temporal distributions of p NO3-are *** current status of knowledge on the chemical mechanism is updated,and the significance of its formation pathways is assessed by various approaches such as field observation and modelling of nitrate production rate,as well as isotopic *** factors impacting p NO3-formation and the corresponding pollution regulation strategies are discussed,in which the importance of atmospheric oxidation capacity and ammonia are ***,the challenges and open questions in p NO3-pollution control in China are outlined.

关键词： Particulate nitrate Reactive nitrogen Particulate matter Formation mechanism Air pollution control

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Mercury transformation processes in nature: Critical knowledge gaps and perspectives for moving forward

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Journal of environmental Sciences 2022年第9期34卷 152-165页

作者： Zhiyuan Gao Wang Zheng Yanbin Li Yurong Liu Mengjie Wu Shouying Li Ping Li Guangliang Liu Xuewu Fu Shuxiao Wang Feiyue Wang Yong Cai Xinbin Feng Baohua Gu Huan Zhong Yongguang Yin Centre for Earth Observation Science and Department of Environment and GeographyUniversity of ManitobaWinnipegMB R3T 2N2Canada Institute of Surface-Earth System Science Tianjin UniversityTianjin 300192China Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education and College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China State Key Laboratory of Agricultural Microbiology Huazhong Agricultural UniversityWuhan 430070China School of the Environment Nanjing UniversityState Key Laboratory of Pollution Control and Resource ReuseNanjing 210023China State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Department of Chemistry and Biochemistry Florida International UniversityMiamiFL 33199USA School of Environment and State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua UniversityBeijing 100084China Environmental Sciences Division Oak Ridge National LaboratoryOak RidgeTennessee 37831USA Environmental and Life Sciences Program(EnLS) Trent UniversityPeterboroughOntario K9L 0G2Canada Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China

The transformation of mercury(Hg) in the environment plays a vital role in the cycling of Hg and its risk to the ecosystem and human health. Of particular importance are Hg oxidation/reduction and methylation/demethylation processes driven or mediated by the dynamics of light, microorganisms, and organic carbon, among others. Advances in understanding those Hg transformation processes determine our capacity of projecting and mitigating Hg risk. Here, we provide a critical analysis of major knowledge gaps in our understanding of Hg transformation in nature, with perspectives on approaches moving forward. Our analysis focuses on Hg transformation processes in the environment, as well as emerging methodology in exploring these processes. Future avenues for improving the understanding of Hg transformation processes to protect ecosystem and human health are also explored.

关键词： Mercury oxidation reduction methylation demethylation isotope fractionation

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Enhanced phosphate removal using zirconium hydroxide encapsulated in quaternized cellulose

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Journal of environmental Sciences 2020年第3期32卷 102-112页

作者： Shuoxun Dong Qinghua Ji Yili Wang Huijuan Liu Jiuhui Qu Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry UniversityBeijing 100083China

Zirconium-based materials are efficient adsorbent for aqueous phosphate ***,current zirconium-based materials still show unsatisfied performance on adsorption capacity and ***,we demonstrate a zirconium hydroxide encapsulated in quaternized cellulose(QC-Zr) for the selective phosphate *** hydroxide nanoparticles were simultaneously generated in situ with the QC framework and firmly anchored in the three-dimensional(3D) cross-linked cellulose *** maximum P adsorption capacity of QC-Zr was 83.6 mg P/***,the QC-Zr shows high P adsorption performance in a wide pH range,generally due to the electrostatic effects of quaternized *** enhanced adsorption of P was also achieved in the presence of competing anions(including Cl^-,NO3^-,SO4^2-,SO4^4-) and humic acid(HA) even at a molar ratio up to 20 *** column adsorption capacity of QC-Zr reached 4000 bed volumes(BV) at EBCT=0.5 min as the P concentration decreased from 2.5 to 0.5 mg/*** study revealed that both-N^+(CH3)3 groups and zirconium hydroxide were involved in phosphate adsorption via electrostatic interactions between -N^+(CH3)3 and phosphate,and the formation of zirconium hydrogen phosphate(Zr(HPO4)x).The 31 P nuclear magnetic resonance(NMR) study implied that P surface-precipitated and inner-sphere complexed with zirconium hydroxide at a ratio of 3:1.

关键词： Adsorption Phosphate removal Zirconium hydroxide aerogel Quaternized cellulose

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中国钢铁工业减污降碳协同控制技术发展与展望

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Engineering 2023年第12期31卷 37-49页

作者： Tingyu Zhu Xiaolong Liu Xindong Wang Hong He CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringInnovation Academy for Green ManufactureChinese Academy of SciencesBeijing 100190China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China HBIS Group Co. Ltd.Shijiazhuang 050023China

As the largest steel-producing country,China’s steel industry has experienced rapid development in terms of production level and *** to the high consumption of coal in the iron and steel industry,air pollutants and carbon dioxide(CO_(2))show similar emission properties in flue *** view of the collaborative reduction of pollution and carbon emissions,the emission standards for pollutants and carbon were first analyzed,suggesting that carbon emission standards for the iron and steel industry should be accelerated.A collaborative technology system for the reduction of pollution and carbon emissions from the iron and steel industry in China is demonstrated,consisting of(1)optimization of present ultra-low emission technology,(2)low-carbon innovation for present production processes,(3)steel production process reengineering,and(4)carbon capture,utilization,and storage(CCUS).Finally,the technical prospect for collaborative reduction of pollution and carbon emissions from the iron and steel industry in China is suggested to support high-quality green development in this industry.

关键词： Iron andsteelindustry pollution Carbon emissions Collaborative reduction

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Epilithic biofilm as a reservoir for functional virulence factors in wastewater-dominant rivers after WWTP upgrade

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Journal of environmental Sciences 2021年第3期33卷 27-35页

作者： Guannan Mao Jinsong Liang Qiaojuan Wang Chen Zhao Yaohui Bai Ruiping Liu Huijuan Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Harbin Institute of Technology School of Civil and Environmental EngineeringShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China

Virulence factors(VFs)confer upon pathogens the ability to cause various types of damage or *** treatment plants(WWTPs)are important point sources for the emission of pathogens and VFs into receiving *** WWTP upgrades are often implemented to improve the water quality of receiving ***,knowledge on the pathogens,VFs,and health risks to receiving aquatic ecosystems after upgrade remains *** this study,we investigated detailed pathogenic information,including taxa,pathogenicity,and health risk,in two wastewater-dominant rivers after WWTP *** 16S rRNA gene sequencing,we screened 14 potential pathogens in water and epilithic biofilm samples,though they were significantly more enriched in the *** 16S rRNA and metagenomic sequencing data,we identified Pseudomonas and Aeromonas as the dominant pathogenic taxa carrying functional VFs(e.g.,mobility and offensive)in the epilithic ***,strong pathogen-specific VF-host co-occurrence events were observed in the epilithic biofilm samples,indicating the importance of biofilms as reservoirs and vehicles for ***,we demonstrated that mobility VF is crucial for biofilm formation and pathogens in biofilm carrying offensive VF may be highly *** and health risk assessment suggested that the skin contact risk of *** carrying VFs was higher than the acceptable probability of 10^(-4)in both water and epilithic biofilm samples,which may threaten ecological and human health.

关键词： Wastewater treatment plant upgrade Epilithic biofilm Pathogens Virulence factors Health risk

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Toxic effect of perfluorooctane sulfonate on plants in vertical-flow constructed wetlands

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Journal of environmental Sciences 2020年第6期32卷 176-186页

作者： Rong Li Tianhao Tang Weichuan Qiao Jun Huang Department of Environmental Engineering College of Biology and the EnvironmentNanjing Forestry UniversityNanjing 210037China School of Environment Beijing Key Laboratory for Emerging Organic Contaminants Control(BKLEOC)State Key Joint Laboratory of Environment Simulation and Pollution Control(SKLESPC)Tsinghua UniversityBeijing 100084China

Per-and polyfluoroalkyl substances(PFASs)can be taken up and bioaccumulated in plants,but the toxic mechanisms of PFASs on wetland plants are still *** present study,the toxic influences of perfluorooctane sulfonate(PFOS)on Eichhornia crassipes(***)and Cy perus alternifolius(***)in a vertical-sub surface-flow constructed wetland were *** results showed that *** was more tolerant to PFOS stress than ***,and the growth and chlorophyll synthesis of the two plants were promoted by low concentration(<0.1 mg/L)of PFOS,and the chlorophyll synthesis was inhibited by high concentration(10 mg/L)of PFOS but the growth did not change *** catalase activity and malondialdehyde content in the leaves of the two plants increased,peroxidase activity decreased under exposure to high concentrations of PFOS,and superoxide dismutase activity did not *** PFOS stress,the membrane of plant leaves and the cell structure of the two wetland plants were destroyed,and the mitochondrial contour of root cells became *** analysis showed that the expression levels of genes related to cell wall formation,the cell apoptosis pathway,material synthesis,and metabolism in the plants were changed by *** in fluorogenic quantitative real time polymerase chain reaction(RT-qPCR)also confirmed that the photosynthesis system of *** was inhibited,while that of *** was promoted.

关键词： Perfluorooctane sulfonate Wetland plants Toxicity Vertical-flow constructed wetlands Effect

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Efficient Inactivation of Uv Resistant Bacteria (Urb) by Combined Uv and Chlorine Disinfection

SSRN

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SSRN 2024年

作者： Cao, Ke-Fan Chen, Zhuo Wei, En-Jing Huang, Bang-Hao Gao, Yu-Jia Wu, Yin-Hu Hu, Hong-Ying Environmental Simulation and Pollution Control State Key Joint Laboratory Key Laboratory of Microorganism Application and Risk Control of the Ministry of Ecology and Environment School of Environment Tsinghua University Beijing100084 China Beijing Laboratory for Environmental Frontier Technologies Beijing100084 China Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China Tsinghua Jiangsu Suzhou215163 China

Ultraviolet (UV) is widely used for wastewater and reclaimed water disinfection due to its high efficiency. However, some bacteria exhibit strong resistance to UV disinfection (referred to as UV resistant bacteria, or URB), which can survive after disinfection and pose various risks. In this study, two bacterial strains with strong UV resistance (Deinococcus soli and Sphingomonas panni) were isolated from reclaimed water. Neither single UV disinfection nor single chlorine disinfection can effectively inactivate these URB strains. To effectively control URB, the combined disinfection of UV and chlorine was investigated, and the results showed a significant improvement in inactivation efficiency with synergistic effects. Further analysis using total antioxidant capacity tests, qPCR detection, and SYTO9/PI staining techniques revealed that the main mechanism behind the synergistic effects was the enhanced damage to intracellular content and DNA. Finally, through cost analysis and disinfection tests with actual reclaimed water, the performance of the combined disinfection method was comprehensively evaluated. The results demonstrate combined disinfection has lower costs, higher inactivation rates, and less selectivity. This study can provide a reliable method for controlling the risks caused by URB in water. © 2024, The Authors. All rights reserved.

关键词： Cost benefit analysis

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