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Biodegradation of 2-methylquinoline by Enterobacter aerogenes TJ-D isolated from activated sludge

Journal of Environmental Sciences 2013年第7期25卷 1310-1318页

作者： Lin Wang Yongmei Li Jingyuan Duan State Key Laboratory of Pollution Control and Resource Reuse Tongji University

Bacterial strain Enterobacter aerogenes TJ-D capable of utilizing 2-methylquinoline as the sole carbon and energy source was isolated from acclimated activated sludge under denitrifying conditions. The ability to degrade 2-methylquinoline by E. aerogenes TJ-D was investigated under denitrifying conditions. Under optimal conditions of temperature （35°C） and initial pH 7, 2-methylquinoline of 100 mg/L was degraded within 176 hr. The degradation of 2-methylquinoline by E. aerogenes TJ-D could be well described by the Haldane model （R 2 〉 0.91）. During the degradation period of 2-methylquinoline （initial concentration 100 mg/L）, nitrate was almost completely consumed （the removal efficiency was 98.5%）, while nitrite remained at low concentration （〈 0.62 mg/L） during the whole denitrification period. 1,2,3,4-Tetrahydro-2-methylquinoline, 4-ethyl-benzenamine, N-butyl-benzenamine, N-ethyl-benzenamine and 2,6-diethyl-benzenamine were metabolites produced during the degradation. The degradation pathway of 2-methylquinoline by E. aerogenes TJ-D was proposed. 2-Methylquinoline is initially hydroxylated at C-4 to form 2-methyl-4-hydroxy-quinoline, and then forms 2-methyl-4-quinolinol as a result of tautomerism. Hydrogenation of the heterocyclic ring at positions 2 and 3 produces 2,3-dihydro-2-methyl-4-quinolinol. The carbon-carbon bond at position 2 and 3 in the heterocyclic ring may cleave and form 2-ethyl-N-ethyl-benzenamine. Tautomerism may result in the formation of 2,6-diethyl-benzenamine and N-butyl-benzenamine. 4- Ethyl-benzenamine and N-ethyl-benzenamine were produced as a result of losing one ethyl group from the above molecules.

关键词： biodegradation Enterobacter aerogenes TJ-D 2-methylquinoline denitrifying conditions activated sludge

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Surface catalytic degradation of ciprofloxacin by ferrihydrite sulfidation under ambient conditions

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Environmental pollution 2025年 371卷 125945页

作者： Chen, Xiru Bai, Lihua Li, Hongjian Wang, Xinhao Wang, Chao Fang, Yanfen Gu, Cheng State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China Key Laboratory of Environmental Remediation and Ecological Health Ministry of Industry and Information·Technology Jiangsu Province Ecology and Environment Protection Engineering Research Center of Groundwater Pollution Prevention and Control Jiangsu Environmental Engineering Technology Co. Ltd. Nanjing210019 China College of Materials and Chemical Engineering China Three Gorges University Hubei Yichang443002 China

Dissolved sulfide (S(-II)) is abundant in sediments and capable of initiating the sulfidation reactions of iron-bearing minerals, in which the reaction mechanisms have been well documented. However, the impact of the S(-II)/Fe concentration ratio on reactive oxygen species (ROS) formation and the fate of co-existing contaminants upon iron-bearing minerals sulfidation under ambient conditions remains inadequately explored. Herein, the transformation of ciprofloxacin (CIP) by ferrihydrite sulfidation under ambient conditions was systematically investigated. Our findings indicated that the rate of CIP degradation initially increased with rising S(-II)/Fe concentration ratios, but subsequently decreased as the ratio continued to elevate. Evidence from electron paramagnetic resonance, molecular probing and quenching experiments revealed that the superoxide anion radical (O2•-), primarily produced from the reaction between O2 and surface-bound Fe(II), was the dominant contributor to the accelerated transformation of CIP. Upon being attacked by ROS, CIP underwent degradation via carboxyl substitution, defluorination, hydroxylation, piperazine ring ketonization and piperazine ring cleavage. Additionally, common water quality factors, i.e., pH, natural organic matter (NOM) and inorganic anions could also significantly influence the degradation processes of CIP during ferrihydrite sulfidation under ambient conditions. This research offers valuable insights into the significant function of mineral sulfidation in facilitating the formation and reactivity of ROS, which sheds light on enhanced elimination of organic contaminants in sediments. © 2025 Elsevier Ltd

关键词： Reactive oxygen species

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Synergistic Mechanism of Modified nZVI and Citrobacter Reshaping Sludge Microbiome Drives Co-Removal of HBCD and Nutrients in Municipal Wastewater

SSRN

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SSRN 2025年

作者： Li, Tianyu He, Yuzhe Zhang, Weixian Peng, Xingxing School of Environmental Science and Engineering Sun Yat-sen University Guangdong Guangzhou510006 China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou510275 China Tongji University College of Environmental Science & Engineering State Key Lab Pollut Control & Resource Reuse Shanghai Shanghai200092 China

Hexabromocyclododecane (HBCD), a persistent and toxic brominated flame retardant, poses severe ecological and health risks due to its bioaccumulation and endocrine-disrupting effects. Effective removal from wastewater is critical to mitigate risks. Coupling functional microbes with modified nanomaterials represents a robust approach for degrading such recalcitrant organohalides. Based on the research foundation of the functional bacterial strain Citrobacter sp. Y3 and a modified nano-zero-valent iron (nZVI) coupled system, we designed and constructed a novel anaerobic continuous stirred-tank reactor (CSTR) system for the treatment of municipal wastewater in this study. HBCD-contaminated wastewater and actual domestic sewage were fed into this CSTR system. During continuous monitoring of HBCD concentration changes over 360 h, we simultaneously tracked the removal efficiencies of nitrogen (N), phosphorus (P), and chemical oxygen demand (COD). The results demonstrated that the HBCD degradation rate reached 100% within 72 h, while the removal of other nutrients met regulatory discharge requirements. The CSTR system significantly enriched diverse functional bacterial taxa harboring multiple functional genes, including organohalide-respiring bacteria (OHRB) (rdhA/B, PecA/B), iron-reducing bacteria (IRB) (cymA, fur), and nitrogen/phosphorus-removing bacteria (hzoB, haoA, norB and pstA/B/C). Dynamic interactions (synergistic cooperation and competition) among microbial communities drove the decomposition and transformation of pollutants. To our knowledge, this study provides the first demonstration of coupling functional bacteria with modified nanomaterials in activated sludge systems. © 2025, The Authors. All rights reserved.

关键词： Health risks

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Characteristics and sources of polycyclic aromatic hydrocarbons in impervious surface run-off in an urban area in Shanghai, China

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第10期14卷 751-759页

作者： Juan HOU Lu BIAN Tian LI State Key Laboratory of Pollution Control and Resource Reuse Tongji University

Rainwater and run-off from three kinds of impervious surface in the Shanghai urban area,China were *** aromatic hydrocarbons(PAHs) were measured in the samples,and their sources were *** mean sum of the 16 PAH concentrations measured in rainwater and run-offs from ceramic tiles,asphalt roofs,and asphalt roads were 873,1404,1743,and 4023 ng/L,*** PAH concentrations found in this study were moderate compared to PAH concentrations found in run-offs in other *** main PAH components in the rainwater,roof run-off,and asphalt road run-off samples were 3-ring PAHs,3–4-ring PAHs,and 4–6-ring PAHs,*** apportionment results indicated that combustion(47.4%–55.5%) and vehicular emissions(30.5%–33.0%) were the major contributors to PAHs in roof *** emissions were the most significant contributors to asphalt road run-off(47.2%),followed by combustion(23.5%),and petroleum(16.3%).Vehicular emissions and coal and natural gas combustion are therefore the most significant sources of PAHs in run-off from impervious surfaces in the Shanghai urban area.

关键词： Polycyclic aromatic hydrocarbons(PAHs) Impervious surface Run-off pollution Source apportionment

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Effect of nitrate concentration on filamentous bulking under low level of dissolved oxygen in an airlift inner circular anoxic-aerobic incorporate reactor

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Journal of Environmental Sciences 2013年第9期25卷 1736-1744页

作者： Yiming Su Yalei Zhang Xuefei Zhou Ming Jiang State Key Laboratory of Pollution Control and Resource Reuse Tongji University

This laboratory research investigated a possible cause of filamentous bulking under low level of dissolved oxygen conditions （dissolved oxygen value in aerobic zone maintained between 0.6-0.8 mgO2 /L） in an airlift inner-circular anoxic-aerobic reactor. During the operating period, it was observed that low nitrate concentrations affected sludge volume index significantly. Unlike the existing hypothesis, the batch tests indicated that filamentous bacteria （mainly Thiothrix sp.） could store nitrate temporarily under carbon restricted conditions. When nitrate concentration was below 4 mg/L, low levels of carbon substrates and dissolved oxygen in the aerobic zone stimulated the nitrate-storing capacity of filaments. When filamentous bacteria riched in nitrate reached the anoxic zone, where they were exposed to high levels of carbon but limited nitrate, they underwent denitrification. However, when nonfilamentous bacteria were exposed to similar conditions, denitrification was restrained due to their intrinsic nitrate limitation. Hence, in order to avoid filamentous bulking, the nitrate concentration in the return sludge （from aerobic zone to the anoxic zone） should be above 4 mg/L, or alternatively, the nitrate load in the anoxic zone should be kept at levels above 2.7 mg NO-3N/g SS.

关键词： anoxic-aerobic system low dissolved oxygen filamentous bulking low nitrate concentration nitrate-storing capacity

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Environmentally relevant concentrations of antimony pose potential risks to human health: An evaluation on human umbilical vein endothelial cells

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Toxicology in Vitro 2025年 106卷 106054页

作者： Wang, Shanshan Guo, Dongqian Chen, Xian Chen, Su-Zhu Cui, Xi-Wen Han, Yong-He Xiang, Ping College of Integrative Medicine Fujian University of Traditional Chinese Medicine Fujian Fuzhou 350122 China Fujian Key Laboratory of Pollution Control and Resource Reuse College of Environmental and Resource Sciences Fujian Normal University Fujian Fuzhou 350117 China Center of Reproductive Medicine Fujian Maternity and Child Health Hospital College of Clinical Medicine for Obstetrics & Gynecology and Pediatrics Fujian Medical University Fujian Fuzhou 350001 China Institute of Environmental Remediation and Human Health School of Ecology and Environment Southwest Forestry University Yunnan Kunming 650224 China

Antimony (Sb) ore exploitation and the use of Sb-containing drugs pose known health risks. This study investigated the toxicity of environmentally relevant concentrations of Sb (0.12–12 mg L⁻¹) on human umbilical vein endothelial cells (HUVECs). The 50 % lethal concentration (LC₅₀) of Sb to HUVECs was 11.4 mg L⁻¹. Exposing to high level of Sb induced cell cycle arrest by altering the expression of cell cycle regulators, inhibiting the transitions of G₀/G₁ to S and S to G₂/M. At 1.2 mg L⁻¹ Sb, CKD6 and p21 expressions in HUVECs changed to 0.75 and 1.32 folds that of no-Sb control, respectively (p < 0.01). At 12 mg L⁻¹ Sb, CDK2, CKD6, and p27 expressions decreased by 1.54, 4.41, and 1.54 folds (p < 0.001), while p21 expression increased by 3.03 folds (p < 0.001) as compared to control. Sb also led to cell apoptosis, evidenced by Annexin V-FITC/PI staining and changes in the expressions of Bax (1.21–1.30 folds, p < 0.01) and Bcl-2 (0.65–0.83 folds). Oxidative damage was a pivotal factor driving cell apoptosis, probably through down-regulating antioxidant genes (CAT, GPX1, and GSTP1) and up-regulating stress response genes (HO-1, SOD1, and TrxR1). The elevated H₂O₂ generated in mitochondria likely contributed to cell apoptosis due to the imbalance in H₂O₂ metabolism. These findings suggest that environmentally relevant concentrations of Sb can exert cytotoxicity to HUVECs, which should be of potential concern for human cardiovascular disease. © 2025 Elsevier Ltd

关键词： Antimony Cell apoptosis Human health Human umbilical vein endothelial cells Oxidative damage

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Responses of dissolved organic nitrogen to varied nitrogen deposition: A 16-year nitrogen-addition and cessation experiment in a subtropical forest

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Science of the Total Environment 2025年 975卷 179284页

作者： Yang, Dongxing Xie, Dani Mulder, Jan Yu, Qian Huang, Yongmei Duan, Lei State Key Laboratory of Regional Environment and Sustainability School of Environment Tsinghua University Beijing100084 China Shanxi Key Laboratory of Land Consolidation School of Land Engineering Chang'an University Shanxi 710064 China Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life Sciences Box 5003 ÅsNO-1432 Norway State Key Laboratory of Pollution Control and Resource Reuse and School of the Environment Nanjing University 163 Xian in Ave. Jiangsu Nanjing210023 China Faculty of Geographical Science Beijing Normal University Beijing100875 China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Tsinghua University Beijing100084 China

The leaching of dissolved organic nitrogen (DON) signals N loss in forest ecosystems, connecting terrestrial and aquatic ecosystems. The response of DON to varied inorganic N (Nin) deposition remains unclear. A 16-year continuous monitoring of DON in throughfall, soil water, and stream water was conducted under a field N manipulation (10-year Nin addition and subsequent cessation of Nin addition) in a subtropical forest in China. Under reference conditions, the average organic N (Nor) deposition was 23.0 ± 4.9 kg N ha−1 yr−1, with approximately one-third leaching at a soil depth of 30 cm, a value that was higher than those reported for temperate forests. Over a 16-year period, DON concentrations tended to increase in throughfall, soil solutions and stream water. The long-term increase in DON concentrations in soil solutions was primarily driven by increasing Nor deposition and indirectly influenced by decreasing acid deposition. Due to a doubling of monthly Nin input, either as sodium nitrate or as ammonium nitrate, the soil DON leaching doubled, causing the soil to transition from a DON sink to a DON source. After Nin addition ceased, the DON leaching returned to natural levels, and the soil reverted to being a DON sink. This study reveals the importance of Nor deposition and decreasing acid deposition as drivers of long-term trends in DON concentrations in soil solutions, in addition to elucidating the response patterns of DON to increasing and decreasing Nin deposition. © 2025 Elsevier B.V.

关键词： Chronic nitrogen addition Dissolved organic nitrogen Nitrogen deposition Soil acidification recovery Water chemistry

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Aquatic ecosystem health assessment in China based on metacommunity theory: From theory to practice

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Carbon Research 2025年第1期4卷 1-4页

作者： Jin, Xiaowei Xie, Huiyu Zhao, Xianfu He, Dekui Zhan, Aibin Cai, Yongjiu Wu, Naicheng Zhang, Xiaowei Yang, Jun Wang, Yeyao Johnson, Andrew C. Wu, Fengchang China National Environmental Monitoring Centre Beijing100012 China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China College of Water Sciences Beijing Normal University Beijing100875 China Key Laboratory of Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources Institute of Hydroecology Ministry of Water Resources and Chinese Academy of Sciences Wuhan430079 China Institute of Hydrobiology Chinese Academy of Sciences Wuhan430072 China Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing210008 China Department of Geography and Spatial Information Techniques Ningbo University Ningbo315211 China State Key Laboratory of Pollution Control & Resource Reuse School of the Environment Nanjing University Nanjing210023 China Fujian Key Laboratory of Watershed Ecology Cc Xiamen361021 China Centre for Ecology and Hydrology Oxfordshire WallingfordOX10 8BB United Kingdom

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Transformation and Characterization of Zooplankton-Aquatic Environment Response Mechanisms in Drinking Water Source Watershed

SSRN

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SSRN 2025年

作者： Yin, Jingyun Xia, Jihong Dou, Chuanbin Wang, Yue Mao, Qianqian Liu, Zhicheng Lu, Yuanshuo Hu, Tao Yang, Huijie Ren, Yifei Lin, Guofu State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China College of Agricultural Science and Engineering Hohai University Jiangsu Nanjing210098 China College of Water Conservancy and Hydropower Engineering Hohai University Jiangsu Nanjing210098 China Putian River Management Center Fujian Putian351100 China

Capturing the spatial and temporal dynamics of zooplankton and aquatic environmental elements in drinking water source watersheds is pivotal for the scientific, holistic, and precise development of a reservoir ecological health assessment system. Additionally, exploring the response mechanism between zooplankton and the aquatic environment is crucial. Nevertheless, research on the zooplankton-aquatic environment interaction in the context of cascade reservoirs as drinking water sources remains limited. This study delves into the spatial distribution and temporal fluctuations of zooplankton communities, as well as the underlying drivers of seasonal turnover in the drinking water sources of a cascade reservoir system. Utilizing co-occurrence network analysis and structural equation modeling, we found that the seasonal turnover rates for Cladocera, Copepoda, and Rotifera were 58.72%, 52.49%, and 54.96%, respectively. The spatial coefficient of variation was highest for Cladocera (73.31%), followed by Copepoda (62.58%) and Rotifera (56.82%). The structural equation model revealed that various aquatic environmental factors played distinct roles in influencing zooplankton communities, with the picocyanobacteria index (0.378), water temperature (0.362), and permanganate index (0.350) being particularly significant. Furthermore, the zooplankton-aquatic environment interaction exhibited diverse response patterns under changing temporal and spatial conditions. © 2025, The Authors. All rights reserved.

关键词： Reservoirs (water)

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Exploring the nexus of industrial production and energy consumption on CO2 emissions in Bangladesh through ARDL bounds testing insights

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Scientific Reports 2025年第1期15卷 1-15页

作者： Salan, Md. Sifat Ar Ali, Akher Amin, Ruhul Sultana, Afroza Siddik, Md Abu Bakkar Kabir, Mohammad Alamgir Department of Statistics and Data Science Jahangirnagar University Savar Dhaka 1342 Bangladesh State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing China The Center for Social Policy and Justice Dhaka Bangladesh

Elevated CO2 emissions are a primary cause of the sustainability challenges, including rising sea levels and extreme weather patterns, faced by Bangladesh and the world. This study examines the intricate relationship between CO2 emissions and various economic and industrial factors in Bangladesh, using the autoregressive distributed lag (ARDL) bound test. By analyzing data from 1971 to 2020, the research identifies both short-run and long-run dynamics influencing CO2 emissions. The findings reveal that industrial production and non-renewable energy consumption have a significant positive impact on CO2 emissions, while agricultural activities and fertilizer consumption exhibit a negative effect. The study underscores the need for Bangladesh to transition towards renewable energy sources and improve agricultural practices to mitigate CO2 emissions. Advanced econometric techniques, including the ARDL Bound Test, CUSUM, and CUSUMSQ, are employed to ensure the robustness of the results. The ARDL framework yields key metrics: RMSE = 0.034, MSE = 0.001, AIC = -160.002, BIC = -139.651, R-squared = 0.801, and adjusted R-squared = 0.753, to explore the CO2 emissions nexus in Bangladesh. The study concludes that, while industrial and energy factors significantly contribute to CO2 emissions, enhancing renewable energy use and adopting climate-smart agricultural practices are essential for sustainable environmental management. Policy recommendations include promoting renewable energy adoption, implementing carbon capture technologies, and revising carbon tax policies to achieve long-term sustainability and environmental conservation. © The Author(s) 2025.

关键词： ARDL CO2 emission Short-run relationship Time series

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