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Prevalence of class 1 integron and its gene cassettes carrying antibiotic resistance genes in drinking water treatment and distribution systems

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Frontiers of Environmental Science & Engineering 2024年第10期18卷 115-126页

作者： Shengnan Liu Zihan Li Yan Shen Shuyu Jia Peng Liu Xu-Xiang Zhang State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China

Class 1 integrons are vital mobile genetic elements involved in the environmental transmission of antibiotic resistance genes(ARGs).However,knowledge about the diversity and abundance of class 1 integrons and gene cassettes during drinking water treatment and distribution is still *** this study,we aimed to uncover the prevalence of class 1 integrons in the drinking water treatment and distribution systems with the combination of culture-dependent and culture-independent ***,we applied the nanopore sequencing method to characterize the diversity and arrangement of ARGs carried by class 1 integron-associated gene cassettes.A total of 42 isolates were inti-positive among the 208 strains isolated from drinking water,which tended to confer multi-drug resistance compared with intll-negative *** absolute abundance of the intl1 average i.15×10^(9) copies/L in the source water and underwent the most significant reduction of over 99.9% after liquid chiorine ***,nanopore sequencing revealed that the class 1 integron-associated gene cassettes carried 51 subtypes of ARGs in drinking water,mainly conferring resistance to aminoglycosides and *** treatment processes,especially liquid chlorine disinfection,reduced most of the ARGs carried by gene cassettes,though some of the ARG subtypes persisted along the treatment and distribution ike aac(6)-Il,aadA,and *** antibiotic resistance gene cassette array laac(6')-Ⅱ arr was most frequently detected,especially in the chlorinated *** study underlined that drinking water was potential reservoir for integron-mediated ARGs transfer,indicating that the health risks of resistance gene cassettes in class 1 integrons deserved urgent attention.

关键词： Class 1 integron Antibiotic resistance genes Drinkingwater Genecassettearrays Liquid chlorine disinfection

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Mixed-valence Cu-based metal-organic framework for selective CO_(2) electroreduction to C_(1) liquid fuels with high energy conversion efficiency

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Nano Research 2025年第4期18卷 153-160页

作者： Luyao Wang Fengting Li Yifan Gu College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Key Laboratory of Cities’Mitigation and Adaptation to Climate Change ShanghaiChina Meteorological Administration(CMA)Tongji UniversityShanghai 200092China

Efficient CO_(2) electroreduction requires catalysts for enhanced energy conversion efficiency and carbon product selectivity with low overpotential,in consideration of the interference of competitive H_(2) evolution reaction and complex intermediate species *** proposed that adaptive electronic structures based on dynamic mixed-valence interconversion would facilitate electron transfer and intermediate turnover during the catalysis,ensuring high activity,selectivity,and ***,a novel mixed-valence Cu-based metal-organic framework was prepared using an electron-rich linker for electrocatalytic reduction of CO_(2).The designed material delivered a remarkable Faradaic efficiency of 99.2%for C_(1) liquid fuels at a low reduction potential of -0.1 V versus reversible hydrogen electrode,considerably higher than that of the commercial copper foam and competitive to the Cu-based electrocatalysts *** experimental data and theoretical calculations verified the Cu(Ⅰ)/Cu(Ⅱ)interconversion and the much higher energy barrier of H2 evolution than carbon product *** a feasible strategy,simultaneously improving energy conversion efficiency,carbon product selectivity,and structural robustness,provides great insights into rational catalyst customization for sustainable CO_(2) conversion.

关键词： metal-organic frameworks CO_(2)electroreduction mixed-valence energy conversion efficiency liquid fuels catalysis

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SnS_(2)nanoparticles embedded in sulfurized polyacrylonitrile composite fibers for high-performance potassium-ion batteries

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Interdisciplinary Materials 2024年第1期3卷 150-159页

作者： Ruiling Li Lijuan Tong Yitong Jiang Yaxin Wang Jing Long Xiaochuan Chen Junxiong Wu Xiaoyan Li Yuming Chen Engineering Research Center of Polymer Green Recycling of Ministry of Education Fujian Key Laboratory of Pollution Control&Resource ReuseCollege of Environmental and Resource Sciences and College of Carbon Neutral Modern IndustryFujian Normal UniversityFuzhouFujianChina

Potassium-ion batteries(PIBs)have garnered significant attention as a promising alternative to commercial lithium-ion batteries(LIBs)due to abundant and cost-efficient potassium ***,the large size of potassium ions and the resulting sluggish reaction kinetics present major obstacles to the widespread use of ***,we present a simple method to ingeniously encapsulate SnS_(2)nanoparticles within sulfurized polyacrylonitrile(SPAN)fibers(SnS_(2)@SPAN)for serving as a high-performance PIB *** large interlayer spacing of SnS_(2)provides a fast transport channel for potassium ions during charge–discharge cycles,while the one-dimensional SPAN skeleton offers massive binding sites and shortens the diffusion path for potassium ions,facilitating faster reaction ***,the excellent ductility of SPAN can effectively accommodate the large volume changes that occur in SnS_(2)upon potassium-ion insertion,thereby enhancing the cyclic stability of SnS_(2).Benefiting from the above advantages,the SnS_(2)@SPAN composites exhibit impressive cyclability over 500 cycles at 4 A g−1,with a capacity retention rate close to 100%.This study provides an effective approach for stabilizing high-capacity PIB anode materials with large volume variations.

关键词： electrospinning encapsulation potassium‐ion batteries sulfurized polyacrylonitrile tin disulfide

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C14-HSL limits the mycelial morphology of pathogen Trichosporon cells but enhances their aggregation:Mechanisms and implications

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Chinese Chemical Letters 2024年第6期35卷 398-403页

作者： Xin Lu Haoran Sun Xiaomeng Li Chunrui Li Jinfeng Wang Dandan Zhou Jilin Engineering Lab for Water Pollution Control and Resources Recovery School of the EnvironmentNortheast Normal UniversityChangchun 130117China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China

The biosecurity hazards caused by pathogenic fungus have been widely *** the long-term coexistence of eukaryotic pathogens and quorum sensing bacteria in different habitats in environments,we hypothesized that they have social interactions via signal *** this work,we firstly discovered the well-known bacterial signal molecules play an adverse role in the cell morphology and metabolism in a model pathogen Trichosporon asahii.N-Tetradecanoyl-L-homoserine lactone(C14-HSL)was discovered to increase pathogen hazards of ***,which limited mycelium by 52%,but enhanced cell aggregation by 93%.Higher fluorescence intensity of tryptophan(59%)and aromatic protein(2-fold)contents after the treatment of C14-HSL,indicating that aromatic proteins helped aggregate Trichosporon and showed *** analysis revealed that C14-HSL upregulated the shikimate pathway(above1-fold)located in downstream of tricarboxylic acid cycle,which contributed to the synthesis of more aromatic proteins and the formation of larger *** limited mycelial growth of *** attributed to the up-regulated expressions of cell cycle *** fungal transboundary response to bacterial C14-HSL was controlled by signal transduction *** study provides new insights into the co-evolution of bacterial and pathogenic fungi in microecosystems.

关键词： Bacterial C14-HSL Mycelium Cell cycle Aggregation Aromatic proteins

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Effects of DOM characteristics from real wastewater on the degradation of pharmaceutically active compounds by the UV/H_(2)O_(2) process

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Journal of Environmental Sciences 2022年第6期34卷 220-228页

作者： Yufei Shi Jinju Geng Xiang Li Yuli Qian Hongzhou Li Liye Wang Gang Wu Qingmiao Yu Ke Xu Hongqiang Ren State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210008China

The characteristics of dissolved organic matter(DOM) can significantly affect the degradation of target compounds by the advanced oxidation processes. In this study, the effects of the different hydrophobicity/hydrophilicity fractions, molecular weight(MW) fractions,fluorescence components and molecular components of DOM extracted from municipal wastewater on the degradation of 4 pharmaceutically active compounds(Ph ACs), including carbamazepine, clofibric acid, atenolol and erythromycin by the UV/H_(2)O_(2) process were investigated. The results showed that the degradation rate constants of 4 Ph ACs decreased dramatically in the presence of DOM. The linear regressions of 4 Ph ACs degradation as a function of specific fluorescence intensity(SFI) are exhibited during the degradation of 4Ph ACs and the SFI may be used to evaluate effect of DOM on target compounds in wastewater. The hydrophobic acid(HPO-A) exhibited the strongest inhibitory effect on degradation of 4 Ph ACs during oxidation process. The small MW fractions of DOM significantly inhibited the degradation of 4 Ph ACs during oxidation process. Among three fluorescence components,hydrophobic humic-like substances may significantly inhibit the degradation of 4 Ph ACs during oxidation process. At the molecular level, the formulas may be derived from terrestrial sources. CHO compound may significantly inhibit the degradation of 4 Ph ACs during oxidation process on formula classes. The unsaturated hydrocarbons, carbohydrates and tannins compounds may significantly inhibit the effectiveness of the UV/H_(2)O_(2) process on compound classes.

关键词： DOM UV/H_(2)O_(2) PhACs Effect Real wastewater

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Release characteristics of arsenic from sediments and its source or sink competition with phosphorus:A case of a great lake with grass-algae alternation

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Journal of Environmental Sciences 2025年第3期149卷 278-287页

作者： Shuhang Wang Yongsheng Chang Wei Huang Dianhai Yang Feifei Che State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China College of Environmental Science and Engineering Donghua UniversityShanghai 201620China National Engineering Laboratory for Lake Pollution Control and Ecological Restoration Chinese Research Academy of Environmental SciencesBeijing 100012China

The arsenic(As)release from sediments in great lakes is affected by various *** this study,the characteristics of As release fromsediments was investigated,and the As sources and sinks with the strengths in sediments from different areas(grass-type,algae-type,and grass-algae alternation areas)in great shallow lakes(Taihu Lake,China)were analyzed,and the influence of P competition in the process of As release was also *** results showed that changing trend of the values of equilibrium As concentration in sediments were consistent with the regional changes(0 to 28.12μg/L),and the sediments from algaetype areas had the higher *** sediments from western lake and northwest lake bay were a strong As and a weak P source,and the north lake bay had the opposite trend of these two *** P source competition with As from the sediments occurred in algae-type *** grass-type areas had strong As and P retention capacities,indicating a sink role of sediment with high As and P sorption *** degree of As and P saturation had similar trend in sediments,and the grass-type areas had the higher values,18.3%-21.4%and 15.31%-20.34%,*** analysis results showed that most of As release contribution was from the bottom(30-50 cm)sediments,and the surface(0-10 cm)sediments from algae-type areas contributed more to the overlying water than other region.

关键词： Arsenic Phosphorus Sediment Source and sink Contribution

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Diversity and dynamic response of anaerobic ammonia oxidation granular sludge

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Journal of Environmental Sciences 2025年第6期152卷 262-275页

作者： Jiahong Ye Xiang Li Yan Yuan Yayi Wang Yong Huang JunMa Han Wang Pengze Dang Pei-ling Xu School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China State Key Laboratory of Pollution Control and Resources Reuse Shanghai Institute of Pollution Control and Ecological SecurityCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China

Red anaerobic ammonia oxidation (Anammox) granular sludge (AnGS) has been reported insuccessfully operating Anammox systems, and its color is associated with sludge ***, in long-term operating systems, AnGS exhibits different sensory colors, physicalstructures, community structures, and denitrification performance, but the relationship betweenthem has not yet been *** AnGS of the Anammox system, which has beenin operation for more than a decade, can be divided into twomain categories: red and *** specific Anammox activity (SAA) in conventional red AnGS increased continuously asthe particle size increased from <0.51 mm to 6.02 ± 0.84 mm. The SAA of white AnGS wereslightly lower than those of red AnGS with similarly-size granules but significantly higherthan AnGS with smaller red granules. Compared with red AnGS, the extracellular polymericsubstances of white AnGS were significantly reduced,mainly due to the higher intracellulariron content, resulting in lower heme c concentration. Thus, heme c may prove not to bean evaluative tool for measuring Anammox activity. Red and white AnGS, whether throughself-aggregation or adsorption by hydroxyl apatite and other carriers, will face the fate ofinternal voids during particle size growth. White AnGS exhibited amore complex microbialcommunity than red AnGS. Candidatus Brocadia was abundant in red AnGS and the abundanceincreased with increasing granule size. Candidatus Kuenenia and Candidatus Jetteniamade significant contributions to denitrification in white AnGS. This study provides a newperspective on particle selection for anammox engineering applications.

关键词： Anaerobic ammonium oxidation granular sludge Sensory diversity Intracellular iron Heme Enzyme activity Microbial diversity

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Design and fabrication of self-suspending aluminum-plastic/semiconductor photocatalyst devices for solar energy conversion

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Journal of Environmental Sciences 2024年第2期136卷 615-625页

作者： Zhi-Ang Zhao Jingyun Mao Chengjing Lu Shuangqiao Yang Qingrong Qian Qinghua Chen Hun Xue Xiaoli Sun Min-Quan Yang College of Environmental and Resource Sciences College of Carbon Neutral Modern IndustryFujian Key Laboratory of Pollution Control and Resource ReuseFujian Normal UniversityFuzhou 350007China State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengdu 610065China

The design and synthesis of self-suspending photocatalyst device with easy recyclability is important for practical ***,this work utilizes aluminum-plastic package waste as raw material to prepare an aluminum-plastic supported TiO_(2)(AP-TiO_(2))photocatalyst device through 3D printing design and surface deposition method.A series of characterizations were carried out to explore the structure,morphology and performance of the AP-TiO_(2)*** UV light illumination,the AP-TiO_(2)-50 efficiently degrade 93.6%tetracycline hydrochloride(THC)after 4 hr,which increases by 8.3%compared with that of TiO_(2)powder suspension system with the same catalyst *** on it,AP-ZnO,AP-CdS,AP-g-C_3N_4and AP-Pt-TiO_(2)are also fabricated,and applied in photocatalytic degradation and hydrogen evolution,which all exhibit higher photoactivities than powder suspension *** work provides a new avenue for the fabrication of advanced recyclable photocatalyst ***,the work offers a novel sight for the high-value utilization of aluminum-plastic package waste,which has positive implications for environmental protection.

关键词： TiO_(2) Self-suspending Photocatalyst device Aluminum plastic

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Metagenomics reveals the microbial community and functional metabolism variation in the partial nitritation-anammox process:From collapse to recovery

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Journal of Environmental Sciences 2024年第1期135卷 210-221页

作者： Hong Wang Hui Gong Xiaohu Dai Min Yang State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China BIOMATH Department of Data Analysis and Mathematical ModellingGhent UniversityGhent 9000Belgium

Mainstream partial nitritation-anammox(PNA)process easily suffers from performance instability and even reactor collapse in ***,it is of great significance to unveil the characteristic of performance recovery,understand the intrinsic mechanism and then propose operational *** this study,we combined long-term reactor operation,batch tests,and metagenomics to reveal the succession of microbial community and functional metabolism variation from system collapse to *** aeration control(0.10-0.25mg O_(2)/L)was critical for performance *** was also found that Candidatus Brocadia became the dominant flora and its abundance increased from 3.5%to 11.0%.Significant enhancements in carbon metabolism and phospholipid biosynthesis were observed during system recovery,and the genes abundance related to signal transduction was dramatically *** up-regulation of sdh and suc genes showed the processes of succinate dehydrogenation and succinyl-CoA synthesis might stimulate the production of amino acids and the synthesis of proteins,thereby possibly improving the activity and abundance of AnAOB,which was conducive to the performance ***,the increase in abundance of hzs and hdh genes suggested the enhancement of the anammox *** in the abundance of key genes involved in nitrogen metabolism indicated that nitrogen removal pathway was more diverse after system *** achievement of performance recovery was driven by anammox,nitrification and denitrification coupled with dissimilatory nitrate reduction to *** results provide deeper insights into the recovery mechanism of PNA system and also provide a potential regulation strategy for the stable operation of the mainstream PNA process.

关键词： Partial nitritation-anammox Metagenomics Microbial community Functional metabolism Recovery

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Evaluating a river's ecological health: A multidimensional approach

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Environmental Science and Ecotechnology 2024年第5期21卷 268-277页

作者： Qiuyun Zhao Yangyang Zhang Xiuwen Li Xiaodong Hu Rui Huang Jixiong Xu Zilong Yin Xinjie Gu Yuncheng Xu Jinbao Yin Qing Zhou Aimin Li Peng Shi State Key Laboratory of Pollution Control and Resource Reuse School of EnvironmentNanjing UniversityNanjing210023China Jiangsu Hydraulic Research Institute Nanjing210023China

Evaluating the health of river surface water is essential,as rivers support significant biological resources and serve as vital drinking water *** the Water Quality Index(WQI)is commonly employed to evaluate surface water quality,it fails to consider biodiversity and does not fully capture the ecological health of *** we show a comprehensive assessment of the ecological health of surface water in the lower Yangtze River(LYR),integrating chemical and biological *** to traditional WQI metrics,the LYR's surface water generally meets China's Class II ***,it also contains 43 high-risk emerging contaminants;nitrobenzenes are found at the highest concentrations,representing 25e90%of total detections,while polycyclic aromatic hydrocarbons present the most substantial environmental risks,accounting for 81e93%of the total risk ***,the plankton-based index of biological integrity(P-IBI)rates the ecological health of the majority of LYR water samples(59.7%)as‘fair’,with significantly better health observed in autumn compared to other seasons(p<0.01).Our findings suggest that including emerging contaminants and P-IBI as additional metrics can enhance the traditional WQI analysis in evaluating surface water's ecological *** results highlight the need for a multidimensional assessment approach and call for improvements to LYR's ecological health,focusing on emerging contaminants and biodiversity rather than solely on reducing conventional indicators.

关键词： The lower reaches of the Yangtze River High-risk emerging contaminants Plankton Ecological risk Biological integrity

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