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Mitigating microbiological risks of potential pathogens carrying antibiotic resistance genes and virulence factors in receiving rivers:benefits of wastewater treatment plant upgrade

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Frontiers of Environmental Science & Engineering 2023年第7期17卷 47-55页

作者： Guannan Mao Donglin Wang yaohui bai Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Wastewater treatment plants(WWTPs)with additional tertiary ultrafiltration membranes and ozonation treatment can improve water quality in receiving ***,the impacts of WWTP upgrade(WWTP-UP)on pathogens carrying antibiotic resistance genes(ARGs)and virulence factors(VFs)in rivers remain poorly *** this study,ARGs,VFs,and their pathogenic hosts were investigated in three rivers impacted by large-scale WWTP-UP.A five-year sampling campaign covered the periods before and after *** showed that the abundance of total metagenome-assembled genomes(MAGs)containing both ARGs and VFs in receiving rivers did not decrease substantially after WWTP-UP,but the abundance of MAGs belonging to pathogenic genera that contain both ARGs and VFs(abbreviated as PAVs)declined markedly.'Genome-resolved metagenomics further revealed that WWTP-UP not only reduced most types of VFs and ARGs in PAVs,but also effectively eliminated efflux pump and nutritional VFs carried by PAVs in receiving ***-UP narrowed the pathogenic host ranges of ARGs and VFs and mitigated the cooccurrence of ARGs and VFs in receiving *** findings underline the importance of WWTPUP for the alleviation of pathogens containing both ARGs and VFs in receiving rivers。

关键词： Wastewater treatment plant upgrade Antibiotic resistance genes(ARGs) Virulencefactors(VFs) Geneco-occurrence Genome-centric analysis

Digitalizing river aquatic ecosystems

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Journal of Environmental Sciences 2024年第3期137卷 677-680页

作者： yaohui bai Hui Lin Chenchen Wang Qiaojuan Wang Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China School of Environmental and Municipal Engineering Tianjin Chengjian UniversityTianjin 300384China Center for Water and Ecology Tsinghua UniversityBeijing 100084China

Traditional river health assessment relies on limited water quality indices and representative organism activity,but does not comprehensively obtain biotic and abiotic information of the ***,we propose a new approach to evaluate the ecological and health risks of river aquatic ***,detailed physicochemical and biological characterization of a river ecosystem can be obtained through pollutant determination(especially emerging pollutants)and DNA/RNA ***,supervised machine learning can be applied to perform classification analysis of characterization data and ascertain river ecosystem ecology and *** proposed methodology transforms river ecosystem health assessment and can be applied in river management.

关键词： Digitalizing River ecosystem health Emerging pollutants High throughput sequencing Machine learning

Selection of water source for water transfer based on algal growth potential to prevent algal blooms

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Journal of Environmental Sciences 2021年第5期33卷 246-254页

作者： Yongjun Song Jing Qi Le Deng yaohui bai Huijuan Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China University of Chinese Academy of Sciences Beijing 100049China

Water transfer is becoming a popular method for solving the problems of water quality deterioration and water level drawdown in lakes. However, the principle of choosing water sources for water transfer projects has mainly been based on the effects on water quality, which neglects the influence in the variation of phytoplankton community and the risk of algal blooms. In this study, algal growth potential(AGP) test was applied to predict changes in the phytoplankton community caused by water transfer projects. The feasibility of proposed water transfer sources(Baqing River and Jinsha River) was assessed through the changes in both water quality and phytoplankton community in Chenghai Lake, Southwest China. The results showed that the concentration of total nitrogen(TN) and total phosphorus(TP) in Chenghai Lake could be decreased to 0.52 mg/L and 0.02 mg/L respectively with the simulated water transfer source of Jinsha River. The algal cell density could be reduced by 60%, and the phytoplankton community would become relatively stable with the Jinsha River water transfer project, and the dominant species of Anabaena cylindrica evolved into Anabaenopsis arnoldii due to the species competition. However, the risk of algal blooms would be increased after the Baqing River water transfer project even with the improved water quality. Algae gained faster proliferation with the same dominant species in water transfer source. Therefore, water transfer projects should be assessed from not only the variation of water quality but also the risk of algal blooms.

关键词： Water transfer Water quality Phytoplankton community Algal blooms Algal growth potential Chenghai Lake

Antimony oxidation and adsorption by in-situ formed biogenic Mn oxide and Fe–Mn oxides

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Journal of Environmental Sciences 2017年第4期29卷 126-134页

作者： yaohui bai William A.Jefferson Jinsong Liang Tingting Yang Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China

Antimony（Sb）, which can be toxic at relatively low concentrations, may co-exist with Mn（Ⅱ）and/or Fe（Ⅱ） in some groundwater and surface water bodies. Here we investigated the potential oxidation and adsorption pathways of Sb（Ⅲ and V） species in the presence of Mn（Ⅱ） and Mn-oxidizing bacteria, with or without Fe（Ⅱ）. Batch experiments were conducted to determine the oxidation and adsorption characteristics of Sb species in the presence of biogenic Mn oxides（BMOs）, which were formed in-situ via the oxidation of Mn（Ⅱ） by a Mn-oxidizing bacterium（Pseudomonas sp. QJX-1）. Results indicated that Sb（Ⅲ） ions could be oxidized to Sb（V） ions by BMO, but only Sb（V） originating from Sb（Ⅲ） oxidation was adsorbed effectively by BMO. Introduced Fe（Ⅱ） was chemically oxidized to Fe OOH, the precipitates of which mixed with BMO to form a new compound, biogenic Fe–Mn oxides（BFMO）. The BMO part of the BFMO mainly oxidized and the Fe OOH of the BFMO mainly adsorbed the Sb species. In aquatic solutions containing both As（Ⅲ） and Sb（Ⅲ）, the BFMO that formed in-situ preferentially oxidized Sb over As but adsorbed As more efficiently. Chemical analysis and reverse transcription real-time polymerase chain reaction revealed that the presence of Fe（Ⅱ）, As（Ⅲ） and Sb（Ⅲ） accelerated the oxidation of Mn（Ⅱ） but inhibited the activity of Mn-oxidizing bacteria. These results provide significant insights into the biogeochemical pathways of Sb, Mn（Ⅱ） in aquatic ecosystems, with or without Fe（Ⅱ）.

关键词： Biogenic Mn oxide Biogenic Fe–Mn oxides Oxidation and adsorption Antimony Arsenic

Comparison of the effects of aluminum and iron(Ⅲ)salts on ultrafiltration membrane biofouling in drinking water treatment

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Journal of Environmental Sciences 2018年第1期30卷 96-104页

作者： Xing Wang baiwen Ma yaohui bai Huachun Lan Huijuan Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Techno|ogy Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Coagulation plays an important role in alleviating membrane fouling, and a noticeable problem is the development of microorganisms after long-time operation, which gradually secrete extracellular polymeric substances（EPS）. To date, few studies have paid attention to the behavior of microorganisms in drinking water treatment with ultrafiltration（UF）membranes. Herein, the membrane biofouling was investigated with different aluminum and iron salts. We found that Al_2（SO_4）_3·18 H_2O performed better in reducing membrane fouling due to the slower growth rate of microorganisms. In comparison to Al_2（SO_4）_3·18H_2O,more EPS were induced with Fe_2（SO_4）_3·x18H_2O, both in the membrane tank and the sludge on the cake layer. We also found that bacteria were the major microorganisms, of which the concentration was much higher than those of fungi and archaea. Further analyses showed that Proteobacteria was dominant in bacterial communities, which caused severe membrane fouling by forming a biofilm, especially for Fe_2（SO_4）_3·x18H_2O. Additionally, the abundances of Bacteroidetes and Verrucomicrobia were relatively higher in the presence of Al_2（SO_4）_3·18 H_2O,resulting in less severe biofouling by effectively degrading the protein and polysaccharide in EPS. As a result, in terms of microorganism behaviors, Al-based salts should be given preference as coagulants during actual operations.

关键词： Ultrafiltration membrane Al-based and Fe-based salts Coagulation Behavior of microorganisms Fouling mechanism

The effects of hydrogen peroxide pre-oxidation on ultrafiltration membrane biofouling alleviation in drinking water treatment

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Journal of Environmental Sciences 2018年第11期30卷 117-126页

作者： Xing Wang baiwen Ma yaohui bai Huachun Lan Huijuan Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China

Pre-oxidation is widely used to reduce ultrafiltration membrane fouling. However, the variation in the composition of microbial communities and extracellular polymeric substances （EPSs） accompanying pre-oxidation in drinking water treatment has received little attention. In this study, hydrogen peroxide （H2O2） was used in a coagulation- ultrafiltration process with Al2（SO4）3.18H2O. A long-term reactor experiment （60 d） showed that pre-oxidation alleviated membrane fouling, mainly due to its inhibition of microbial growth, as observed by flow cytometry measurements of the membrane tank water. Further analysis of the formed cake layer demonstrated that the corresponding levels of EPS released from the microbes were lower with than without H202 treatment. In comparison to polysaccharides, proteins dominated the EPS. 2D-electrophoresis showed little difference （p 〉 0.05, Student＇s t-test） in the composition of proteins in the cake layer between the treatments with and without H2O2. The molecular weights of proteins ranged from approximately 30-50 kDa and the majority of isoelectric points ranged from 6 to 8. Highthroughput sequencing showed that the predominant bacteria were Proteobacteria, Bacteroidetes, and Verrucomicrobia in both cake layers. However, the relative abundance of Planctomycetes was higher in the cake layer with H2O2 pre-oxidation, which was likely probably due to the strong oxidative resistance of its cell wall. Overall, our findings clarify the fundamental molecular mechanism in H2O2 pre-oxidation for ultrafiltration membrane bio-fouling alleviation in drinking water treatment.

关键词： Ultrafiltration membrane Hydrogen peroxide Fouling alleviation Extraeellular polymeric substances Microbial community

Microbial responses to the use of NaClO in sediment treatment

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Frontiers of Environmental Science & Engineering 2022年第2期16卷 25-38页

作者： Kun Li Tingming Ye Wang Zhang Jianfeng Peng yaohui bai Weixiao Qi Huijuan Liu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China University of Chinese Academy of Sciences Beijing 100049China China University of Mining&Technology Beijing 100083China

Chlorine is often used in algal removal and deodorization of landscape waters,and occasionally used as an emergency treatment of heavily polluted ***,the ecological impact of this practice has not been fully studied and *** this study,NaClO at 0.1 mmol/g based on dry weight sediment was evenly mixed into the polluted sediment,and then the sediment was incubated for 150 days to evaluate its microbial *** showed that NaClO addition enhanced the release of TOC,TN,Cr and Cu from the *** microbial richness in the examined sediment decreased continuously,and the Chao1 index declined from 4241 to 2731,in 150 *** microbial community composition was also *** abundance of Proteobacteria and Bacteroidetes increased to 54.8%and 4.2%within 7 days compared to the control,and linear discriminant analysis(LDA)showed gram-negative bacteria and aerobic bacteria enriched after *** functional prediction with PICRUSt2 showed the functions of the microbial community underwent major adjustments,and the metabolic-related functions such as carbon metabolism,including pyruvate and methane metabolisms were significantly inhibited;besides,15 out of 22 analyzed key enzymes involved in C cycling and 6 out of 12 key enzymes or genes involved in N cycling were strongly impacted,and the enzymes and genes involved in carbon degradation and denitrification showed remarkable *** can be concluded that chlorination posed a seriously adverse effect on microbial community structure and *** study deepens the understanding of the ecological effects of applying chlorine for environmental remediation.

关键词： Sediment chlorination Substance mobility Microbial response Community composition Function

Impacts of backwashing on micropollutant removal and associated microbial assembly processes in sand filters

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Frontiers of Environmental Science & Engineering 2023年第3期17卷 87-92页

作者： Donglin Wang Jie Zhou Hui Lin Junwen Chen Jing Qi yaohui bai Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China 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

Backwashing is crucial for preventing clogging of sand ***,few studies have investigated the effect of backwashing on micropollutant removal and the dynamic changes in the microbial community in sand ***,we used a series of manganese and quartz sand filters under empty bed contact times(EBCTs)of 2 h and 4 h to explore variations in micropollutant degradation and temporal dynamics of the microbial community after *** results showed that the removal efficiencies of caffeine,sulfamethoxazole,sulfadiazine,trimethoprim,atrazine,and active biomass recovered within 2 d after backwashing in both types of sand filters at 2-h EBCT,but the recovery of sulfadiazine and trimethoprim was not observed at 4-h ***,the removal efficiency of atenolol increased after backwashing in the manganese sand filters,whereas maintained almost complete removal efficiency in the quartz sand filters at both *** correlation analysis indicated that microbial community composition gradually recovered to the pre-backwashing level(R increased from 0.53 to 0.97)at 2-h EBCT,but shifted at 4-h EBCT(R<0.25)after ***,the compositions of the recovered,depleted,and improved groups of microbes were distinguished by applying hierarchical clustering to the differentially abundant amplicon sequence *** cumulative relative abundance of recovered microbes at 2-h EBCT was 82.76%±0.43%and 46.82%±4.34%in the manganese and quartz sand filters,*** contrast,at 4-h EBCT,the recovered microbes dropped to 15.55%–25.69%in both types of sand filters.

关键词： Sand filter Backwashing Recovery Micropollutants Community composition

Rapid control of black and odorous substances from heavilypolluted sediment by oxidation:Efficiency and effects

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Frontiers of Environmental Science & Engineering 2019年第6期13卷 91-101页

作者： Kun Li Min Yang Jianfeng Peng Ruiping Liu Tista Prasai Joshi yaohui bai Huijuan Liu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100039China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China Nepal Academy of Science and Technology KhumaltarLalitpur 44700Nepal

The control ofblack and odorous substances in sediments is of crucial importance to improve the urban ecological landscape and to restore water environments *** this study,chemical oxidation by the oxidants NaClO,H2O2,and KMnO4 was proposed to achieve rapid control of black and odorous substances in heavily-polluted *** indicate that NaClO and KMnO4 are effective at removing Fe(II)and acid volatile *** removal efficiencies of Fe(II)and AVS were determined to be 45.2%,94.1%,and 93.7%,89.5%after 24-h exposure to NaClO and KMnO4 at 0.2 mmol/g,***,rapid oxidation might accelerate the release of pollutants from *** release of organic matters and phosphorus with the maximum ratios of 22.1%and 51.2%was observed upon NaClO oxidation at 0.4 mmol/***,the introduction of oxidants contributed to changes in the microbial community composition in *** oxidation by NaClO and KMnO4 at 0.4 mmol/g,the Shannon index decreased from 6.72 to 5.19 and 4.95,whereas the OTU numbers decreased from 2904 to 1677 and 1553,***,H2O2 showed a lower effect on the removal of black and odorous substances,pollutant release,and changes in sediment *** study illustrates the effects of oxidant addition on the characteristics of heavily polluted sediments and shows that chemical oxidants may be an option to achieve rapid control of black and odorous substances prior to remediation of water environments.

关键词： Oxidants Heavily polluted sediment Black and odorous substances Release behaviors Microorganism