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Enhanced sensitivity of extracellular antibiotic resistance genes (ARGs) to environmental concentrations of antibiotic

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Chemosphere 2024年 360卷 142434页

作者： Lin, Huai Li, Ruiqing Chen, Yuying Cheng, Yuan Yuan, Qingbin Luo, Yi State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China School of Environmental Science and Engineering Nanjing Tech University Nanjing211816 China Shenzhen Research Institute of Nanjing University Shen Zhen518000 China

As emerging contaminants, antibiotics are frequently present in various environments, particularly rivers, albeit often at sublethal concentrations (ng/L∼μg/L). Assessing the risk associated with these low levels, which are far below the lethal threshold for most organisms, remains challenging. In this study, using microcosms containing planktonic bacteria and biofilm, we examined how antibiotic resistance genes (ARGs) in different physical states, including intracellular ARGs (iARGs) and extracellular ARGs (eARGs) responded to these low-level antibiotics. Our findings reveal a positive correlation between sub-lethal antibiotic exposure (ranging from 0.1 to 10 μg/L) and increased prevalence (measured as ARG copies/16s rDNA) of both iARGs and eARGs in planktonic bacteria. Notably, eARGs demonstrated greater sensitivity to antibiotic exposure compared to iARGs, with a lower threshold (0.1 μg/L for eARGs versus 1 μg/L for iARGs) for abundance increase. Moreover, ARGs in biofilms demonstrates higher sensitivity to antibiotic exposure compared to planktonic bacteria. To elucidate the underlying mechanisms, we established an integrated population dynamics-pharmacokinetics-pharmacodynamics (PD-PP) model. This model indicates that the enhanced sensitivity of eARGs is primarily driven by an increased potential for plasmid release from cells under low antibiotic concentrations. Furthermore, the accumulation of antibiotic in biofilms induces a greater sensitivity of ARG compared to the planktonic bacteria. This study provides a fresh perspective on the development of antibiotic resistance and offers an innovative approach for assessing the risk of sublethal antibiotic in the environment. © 2024

关键词： Antibiotics

Calcium Ions Transport Mechanism in Amination Phosphogypsum Occurs Through Carbon Dioxide Sorption

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SSRN 2023年

作者： Hou, Jiaojiao Liu, Zude Ni, Xiaoyang State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China School of Environment Tsinghua University Beijing100084 China School of Engineering China University of Geosciences Wuhan430074 China

Apparent inconsistencies in comprehensive utilization of sulfate indicate that there has been no systematically investigation of relationships between reacting conditions and structures of materials. This study quantifies the dissolution-carbonation coprecipitation and transformation process from phosphogypsum (PG) to polymorphs of calcium carbonates (CaCO3) in presence of NaOH, NH3, and CO2 via a facile two-step. The data provides a quantitative framework for characterizations of resulting solutions and achievement of products. Meanwhile, the kinetic mechanism of preparing CaCO3 and PG carbonation was established by using a new atomistic KMC model which reconciles discrepancies and predict the closed-to-equilibrium dissolution modes, especially to predict the structures and stability of the hydrate CaSO4 leveraging differential solubilities at a molecular level. Subsequent carbonation with CO2 and calculation equilibrium relationship of the phase assemblage under controlled conditions produced CaCO3 from CaSO4×2H2O. The model simulations and parameter optimization of precursors, intermediates, and generators were monitored and compared in local time through the RS and powder EPR experiments, which provided optical information to investigate the kinetic mechanism. Findings that PG-involved pathways are involved in purification and mineralization underscore a need to reconsider traditional notions of calcium-rich waste utilization and CO2 capture. © 2023, The Authors. All rights reserved.

关键词： Calcium carbonate

The impact of the atmospheric turbulence-development tendency on new particle formation: a common finding on three continents

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National Science Review 2021年第3期8卷 140-150页

作者： Hao Wu Zhanqing Li Hanqing Li Kun Luo Yuying Wang Peng Yan Fei Hu Fang Zhang Yele Sun Dongjie Shang Chunsheng Liang Dongmei Zhang Jing Wei Tong Wu Xiaoai Jin Xinxin Fan Maureen Cribb Marc L.Fischer Markku Kulmala Tuukka Pet?j? State Key Laboratory of Remote Sensing Science College of Global Change and Earth System ScienceBeijing Normal University ESSIC and Department of Atmospheric Science University of MarylandCollege Park State Key Laboratory of Clean Energy Utilization Zhejiang University School of Atmospheric Physics Nanjing University of Information Science and Technology Meteorological Observation Center China Meteorological Administration State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Lawrence Berkeley National Laboratory Institute for Atmospheric and Earth System Research/Physics Faculty of ScienceUniversity of Helsinki Aerosol and Haze Laboratory Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Joint International Research Laboratory of Atmospheric and Earth System Sciences School of Atmospheric Sciences Nanjing University

A new mechanism of new particle formation(NPF) is investigated using comprehensive measurements of aerosol physicochemical quantities and meteorological variables made in three continents,including Beijing,China;the Southern Great Plains site in the USA;and SMEAR Ⅱ Station in Hyytiala,Finland.D espite the considerably different emissions of chemical species among the sites,a common relationship was found between the characteristics of NPF and the stability *** stability parameter(ζ=Z/L,where Z is the height above ground and L is the Monin-Obukhov length) is found to play an important role;it drops significantly before NPF as the atmosphere becomes more unstable,which may serve as an indicator of nucleation *** the atmosphere becomes unstable,the NPF duration is closely related to the tendency for turbulence development,which influences the evolution of the condensation ***,the unstable atmosphere may dilute pre-existing particles,effectively reducing the condensation sink,especially at coarse mode to foster *** new mechanism is confirmed by model simulations using a molecular dynamic model that mimics the impact of turbulence development on nucleation by inducing and intensifying homogeneous nucleation events.

关键词： new particle formation turbulence development molecular dynamic

Water-level based discrete integrated dynamic control to regulate the flow for sewer-WWTP operation

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Frontiers of environmental Science & Engineering 2020年第3期14卷 103-111页

作者： Zhengsheng Lu Moran Wang Mingkai Zhang Ji Li Ying Xu Hanchang Shi Yanchen Liu Xia Huang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China School of Environment and Civil Engineering Jiangnan UniversityWuxi 214122China Wuxi Water Group Co.Ltd. Wuxi 214031China

This study aims to propose a multi-point integrated real-time control method based on discrete dynamic water level variations,which can be realized only based on the programmable logic controller(PLC)system without using a complex mathematical model.A discretized water level control model was developed to conduct the real-time control based on *** combines the upstream pumping stations and the downstream influent pumping systems of wastewater treatment plant(WWTP).The discretized water level control method can regulate dynamic wastewater pumping flow of pumps following the dynamic water level variation in the sewer *** control method has been successfully applied in practical integrated operations of sewer-WWTP following the sensitive flow disturbances of the sewer *** operational results showed that the control method could provide a more stabilized regulate pumping flow for treatment process;it can also reduce the occurrence risk of combined sewer overflow(CSO)during heavy rainfall events by increasing transport capacity of pumping station and influent flow in WWTP,which takes full advantage of storage space in the sewer system.

关键词： Sewer system Integrated control Discrete control Water level

Low-Concentration Organics Mitigate the Inhibition of Free Nitrous Acid on Nitrification in Biofilters for Gaseous Ammonia Removal

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SSRN 2023年

作者： Niu, Lishan Baig, Zenab Tariq Yeung, Marvin Soomro, Abdul F. Lu, Lichao Xi, Jinying South China University of Technology China Environmental Simulation and Pollution Control State Key Joint Laboratory School of Environment Tsinghua University Beijing100084 China School of Petrochemical Engineering and Environment Zhejiang Ocean University Zhoushan316004 China

Free nitrous acid (FNA) inhibition restricted the ammonia removal efficiency of bioreactors under a medium or high inlet ammonia loading, mainly by inhibiting nitrite-oxidizing bacteria (NOB) and ammonia-oxidizing bacteria (AOB). Three parallel ammonia removal biofilters with different inoculums were set in this study. When increasing the inlet ammonia loading rate to 21.8 ± 1.3 gN m-3 h-1, biofilters could merely remove 60.3 ± 10.0% of inlet ammonia since FNA inhibition became the main inhibitor of nitrifiers, due to the accumulation of intermediate products including NO2- and H+. To relieve FNA inhibition, low-concentration extraneous organic electron donors (C/N © 2023, The Authors. All rights reserved.

关键词： Nitrification

Mitigation Organic Fouling of Electrified Ceramic Membrane Using in Situ Generated Reactive Species: Combined Theoretical and Experimental Investigation

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SSRN 2024年

作者： Lin, Zhiwei Zhang, Chunhui Liu, Lie Liu, Yanbiao Li, Yanxin Guo, Meiguangzi Chen, Leyi Su, Peidong China University of Mining & Technology Beijing School of Chemical & Environmental Engineering Beijing100083 China Tsinghua University Center for Water & Ecology School of Environment State Key Joint Laboratory of Environment Simulation and Pollution Control Beijing100084 China Dalian University of Technology Dalian116024 China

The performance of membrane separation processes was limited by organic fouling, and existing anti-organic fouling strategies were ineffective. To address these issues, an electrochemical ceramic membrane (ECM) was developed by ultrasonic spray pyrolysis of a thin SnO2 layer co-doped with Sb and F onto an Al2O3 substrate. Experimental results demonstrated that it displayed excellent hydrophilicity, electrical conductivity (square resistance = 2.47 Ω/sq), electrocatalytic properties (charge transfer resistance = 1.37 Ω), water permeability (178 LMH/bar), low energy consumption (2.61–3.59 kWh/m3) and reusability. Doping of Sb and F in the SnO2 layer led to an increase in the free electron concentration and a decrease in the bandgap width, collectively promoting the electrical conductivity. In situ generation of •OH and 1O2 at the anode membrane interface effectively eliminated organic fouling of the composite membrane. Hence, this study proposes an advanced membrane design that can effectively mitigate organic fouling of separation membranes, thereby enhancing water purification efficiency and reducing membrane cleaning costs. © 2024, The Authors. All rights reserved.

关键词： Spray pyrolysis

Simultaneous Removal of Phosphorus and Organic Matter in Municipal Tail Water Enhanced by Fe2+/S2O82- System: Parameter Optimization, Efficiency, Mechanism

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SSRN 2023年

作者： Gao, Yaoyao Kong, Xiangji Huang, Xiao Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China Nanjing Institute of Environmental Science Ministry of Ecology and Environment of the People’s Republic of China Key Laboratory of Pesticide Environment Assessment and Pollution Control Ministry of Ecology and Environment of the People’s Republic of China Nanjing210042 China Shenzhen518055 China

The simultaneous removal of phosphorus (TP) and organic matter is a very ingenious process and has attracted much attention. A Fe2+/S2O82- system was constructed to advanced treat TP and organic matter in sewage. The influencing factors and degradation mechanism were investigated. The results showed that the parameters of Fe2+/P and S2O82-/Fe2+ were optimized to be 5 and 4, respectively. The molar ratio of S2O82-/Fe2+ was 4, the removal performance of TP and target oriented curriculum (TOC) was the best, and the increase of temperature was beneficial to the removal of TP and TOC. The precipitate in the secondary effluent was mainly ferric phosphate. The TP removal mechanism lied in the removal by the formation of Fe4(PO4)3(OH)3 precipitation. And protein macromolecular organic matter is degraded into small molecular organic matter such as methane (CH4) for subsequent use as a high-quality carbon source. © 2023, The Authors. All rights reserved.

关键词： Degradation

Characteristics, Sources, and Health Risks of Volatile Organic Compounds in Different Functional Regions of Shenyang

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SSRN 2024年

作者： Zhao, Di Wang, Qi Hui, Yu Liu, Yan Wang, Fan Chu, Biwu State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Liaoning Provincial Key Laboratory of Atmospheric Environmental Pollution Prevention and Control Shenyang Academy of Environmental Sciences Shenyang110167 China Department of Transfusion The First Hospital of China Medical University Shenyang110122 China University of Chinese Academy of Sciences Beijing100049 China

The concentration of 56 volatile organic compounds (VOCs) in the ambient air of Shenyang was continuously monitored at four sites in 2021. The characteristics, sources, secondary pollution potential and health risks of VOCs in different functional regions of Shenyang were discussed. The results indicate that the concentration of VOCs in industrial regions was significantly higher than that in non-industrial regions, with a mean of 41.09 ± 69.82 parts per billion volumes (ppbv) compared to 19.99 ± 17.86 ppbv (commercial and residential region in urban fringe), 27.51 ± 28.81 ppbv (educational and scenic region) and 29.71 ± 23.97 ppbv (commercial and residential region in urban center). The positive matrix factorization (PMF) model was utilized to assign ethe origin of VOCs in Shenyang, and six factors were recognized: gasoline vehicle (34.8%), diesel vehicle (28.3%), combustion (11.4%), vegetation (9.7%), industrial processes (8.2%), and fuel evaporation (7.7%). The results of the reactivity evaluation indicated that the ozone (O3) formation potential (OFP) was primarily influenced by industrial processes (29.2%), diesel vehicle (25.7%), vegetation (17.0%). These three factors were also the top three contributors to secondary organic aerosol formation potential (SOAP), accounting for 44.2%, 9.4% and 30.3%, respectively. At the all four sites, the non-carcinogenic and carcinogenic risks of VOCs ranged from 1.6 × 10-2 to 3.8 × 10-2 and from 2.3 × 10-6 to 3.3 × 10-6, respectively. And the main risks can be attributed to emissions from industrial processes and gasoline vehicles. These findings suggested to strengthen the control of vehicles emissions throughout all regions in Shenyang and industrial processes emissions in industrial regions. © 2024, The Authors. All rights reserved.

关键词： Volatile organic compounds

Kinetic Modeling of Secondary Organic Aerosol in a Weather-Chemistry Model: Parameterizations, Processes, and Predictions for GOAmazon

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ACS ES&T Air

ACS ES&T Air 2025年第2期2卷 249-263页

作者： Yicong He Kelsey R. Bilsback Manish Shrivastava Rahul A. Zaveri John E. Shilling John H. Seinfeld Bin Zhao Shuxiao Wang Christopher D. Cappa Jeffrey R. Pierce Shantanu H. Jathar Department of Mechanical Engineering Colorado State University Fort Collins Colorado 80523 United States；State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China；State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084 China Department of Mechanical Engineering Colorado State University Fort Collins Colorado 80523 United States；PSE Healthy Energy Oakland California 94612 United States Pacific Northwest National Laboratory Richland Washington 99354 United States Divison of Chemistry and Chemical Engineering California Institute of Technology Pasadena California 91125 United States State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China；State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084 China Department of Atmospheric Science Colorado State University Fort Collins Colorado 80521 United States Department of Civil and Environmental Engineering University of California Davis Davis California 95616 United States Department of Mechanical Engineering Colorado State University Fort Collins Colorado 80523 United States

Secondary organic aerosol (SOA) forms and evolves in the atmosphere through many pathways and processes, over diverse spatial and time scales. Hence, there is a need to represent these widely varying kinetic processes in large-scale atmospheric models to allow for accurate predictions of the abundance, properties, and impacts of SOA. In this work, we integrated a kinetic, process-level model (simpleSOM-MOSAIC) into a weather-chemistry model (WRF-Chem) to simulate the oxidation chemistry and microphysics of atmospheric SOA. simpleSOM-MOSAIC simulates multigenerational gas-phase chemistry, autoxidation reactions, aqueous chemistry, heterogeneous oxidation, oligomerization, and phase-state-influenced gas/particle partitioning of SOA. As a case study, the integrated WRF-Chem-simpleSOM-MOSAIC (WC-SSM) model was used to simulate the photochemical evolution downwind of a large city (Manaus, Brazil) in the Amazon and, in turn, study the anthropogenic and biogenic interactions in an otherwise pristine environment. Consistent with previous work, we found that OA was enhanced by up to a factor of 4 in the urban plume due to elevated hydroxyl radical (OH) concentrations, relative to the background, and that this OA was dominated by SOA from biogenic precursors (80%). In addition to accurately simulating the OA enhancement in the urban plume, the model reproduced the magnitude of the OA oxygen-to-carbon (O:C) ratio and broadly tracked the evolution of the aerosol number size distribution. Our work highlights the importance of including an integrated, kinetic representation of SOA processes in an atmospheric model.

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