ACS ES&T water最新文献

Equilibria and Kinetics Involving Aqueous BrCl·–

IF 4.8

ACS ES&T water Pub Date : 2025-04-03 DOI: 10.1021/acsestwater.5c0007110.1021/acsestwater.5c00071

David M. Stanbury*,

引用次数: 0

Nano-Zerovalent Iron (nZVI) Shifts Microbial Nitrate Respiration from Denitrification to Dissimilatory Nitrate Reduction to Ammonium (DNRA) for the Treatment of Low-C/N Wastewater

IF 4.8

ACS ES&T water Pub Date : 2025-04-01 DOI: 10.1021/acsestwater.4c0106510.1021/acsestwater.4c01065

Liushi Zheng, Hao Yue, Ximao Wang, Xiaohong Guan* and Yanwen Shen*,

{"title":"Nano-Zerovalent Iron (nZVI) Shifts Microbial Nitrate Respiration from Denitrification to Dissimilatory Nitrate Reduction to Ammonium (DNRA) for the Treatment of Low-C/N Wastewater","authors":"Liushi Zheng, Hao Yue, Ximao Wang, Xiaohong Guan* and Yanwen Shen*, ","doi":"10.1021/acsestwater.4c0106510.1021/acsestwater.4c01065","DOIUrl":"https://doi.org/10.1021/acsestwater.4c01065https://doi.org/10.1021/acsestwater.4c01065","url":null,"abstract":"Nano-zerovalent iron (nZVI) as an alternative electron donor could drive nitrate reduction for nitrogen removal or recovery from wastewater. However, whether and how nZVI governs the two competing microbial nitrate-reducing processes, namely, denitrification and dissimilatory nitrate reduction to ammonium (DNRA), remains unknown in activated sludge systems. Here, through batch experiments using denitrifying sludge under varied C/N ratios and nZVI doses, a maximum nitrate-to-ammonium efficiency of 97.0% with a nitrate-reducing rate of 15.2 mg N/L/h was achieved at a C/N ratio of 2 and nZVI dose of 1000 mg/L. While nZVI-driven DNRA dominated microbial nitrate reduction over a wide range of C/N ratios (1–10), high nZVI doses caused cellular damage. Metagenome and transcriptome analyses indicated the proliferation of DNRA bacteria (e.g., Desulfobulbus, Geobacter, Nitrospira) in the presence of nZVI and the predominance of DNRA over denitrification with upregulated nrfA/H and downregulated nirS, norB, and nosZ genes. Enhanced nitrate-to-ammonium interaction might potentially benefit from pili-assembling and iron-respiring bacteria that acquire electrons from Fe(0) via extracellular electron transfer. This work proved that nZVI could regulate microbial nitrate reduction by modulating the activated sludge communities and, therefore, provided a feasible route to recover ammonium from low-C/N wastewater.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 4","pages":"1683–1693 1683–1693"},"PeriodicalIF":4.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Direct Photolysis Determines the Environmental Fate of Furosemide and Its Metabolite Saluamine in Sunlit Surface Waters

IF 4.8

ACS ES&T water Pub Date : 2025-03-30 DOI: 10.1021/acsestwater.4c0120910.1021/acsestwater.4c01209

Lin Li, Xiaoci Li, Mingbao Feng*, Jean-Marc Chovelon, Junhe Lu, Jing Chen and Yuefei Ji*,

{"title":"Direct Photolysis Determines the Environmental Fate of Furosemide and Its Metabolite Saluamine in Sunlit Surface Waters","authors":"Lin Li, Xiaoci Li, Mingbao Feng*, Jean-Marc Chovelon, Junhe Lu, Jing Chen and Yuefei Ji*, ","doi":"10.1021/acsestwater.4c0120910.1021/acsestwater.4c01209","DOIUrl":"https://doi.org/10.1021/acsestwater.4c01209https://doi.org/10.1021/acsestwater.4c01209","url":null,"abstract":"Furosemide (FUR) and its metabolite saluamine (SLA) are emerging contaminants that undergo rapid phototransformation in sunlit surface waters. The chloroaniline moiety of FUR serves as a chromophore responsible for the absorption of natural sunlight. The quantum yields for sunlight photolysis of FUR and SLA were determined to be 2.08 × 10–2 and 2.44 × 10–2 mol E–1, respectively. Under midspring noon sunlight, their near-surface half-lives were approximately 17.3–25.3 and 27.3–40.0 min, respectively, indicating nonpersistence in photic surface waters. The phototransformation of FUR occurs primarily through photonucleophilic substitution, generating a hydroxyl-dechlorination product. No significant difference in the photolysis rate constants was observed at environmentally relevant pH. The presence of dissolved organic matter suppressed the direct photolysis of FUR by competing to absorb photons. Kinetic modeling revealed that FUR and SLA accumulate in the dark hypolimnion during lake stratification, but exhibit half-lives of merely 266–554 and 450–981 min within 3 m depths under well-mixed conditions. These findings underscore the importance of direct photolysis in determining the environmental fate of FUR and SLA in sunlit surface waters or well-mixed photic zones.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 4","pages":"1832–1842 1832–1842"},"PeriodicalIF":4.8,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microbial Networks in Subsurface Sediment Porewater: Key Drivers for Organic Matter Degradation and Groundwater Chemistry Evolution

IF 4.8

ACS ES&T water Pub Date : 2025-03-28 DOI: 10.1021/acsestwater.5c0010110.1021/acsestwater.5c00101

Wenkai Qiu, Yao Du*, Xinyu Liu, Yetong Liu, Wenhui Liu, Chang Liu, Yamin Deng, Teng Ma and Yanxin Wang,

{"title":"Microbial Networks in Subsurface Sediment Porewater: Key Drivers for Organic Matter Degradation and Groundwater Chemistry Evolution","authors":"Wenkai Qiu, Yao Du*, Xinyu Liu, Yetong Liu, Wenhui Liu, Chang Liu, Yamin Deng, Teng Ma and Yanxin Wang, ","doi":"10.1021/acsestwater.5c0010110.1021/acsestwater.5c00101","DOIUrl":"https://doi.org/10.1021/acsestwater.5c00101https://doi.org/10.1021/acsestwater.5c00101","url":null,"abstract":"Subsurface microbial communities are essential drivers in biogeochemical cycles, yet their sampling and characterization remain challenging. Specifically, microbial assemblages in sedimentary porewater have been largely overlooked in existing research. In this study, we collected sufficient aquifer sediments for porewater extraction and biogeochemical analyses from four drilling sites in an aquifer characterized by active microbial activity, organic-rich deposits, and elevated levels of geogenic ammonium. Distinct microbial communities were identified in bound porewater, free porewater, and groundwater, with lactate/acetate, nitrite, and Fe(II), respectively, emerging as the dominant intermediates. Nitrogen metabolism pathways evolved from fermentation in bound porewater to denitrification in free porewater, culminating in various ammonium-producing processes in groundwater. Network analysis highlighted three metabolic modules: bound porewater as an energy supply center delivering organic acids, free porewater as a chemolithotrophic hub consuming nitrate, and groundwater as a resource convergence center. In groundwater, iron reduction and ammonium production were mediated by nodes Geobacteraceae and Erysipelothrix, which exhibited the highest network stress (2082) and shortest average path length (1.32). These findings emphasize the critical role of porewater microbiomes in organic matter degradation and groundwater environment evolution, calling for further studies on this essential sediment–groundwater interface across diverse aquatic ecosystems.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 4","pages":"1982–1989 1982–1989"},"PeriodicalIF":4.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comprehensive Analysis of Pesticide Pollution across the Yangtze River Basin: Spatiotemporal Distribution, Socio-Economic Correlations, and Ecological Risk Assessment

IF 4.8

ACS ES&T water Pub Date : 2025-03-28 DOI: 10.1021/acsestwater.5c0008410.1021/acsestwater.5c00084

Yongchang Xie, Quanzhen Liu, Xiong Xu, Lihua Lin, Weiqing Wang and Donghong Wang*,

{"title":"Comprehensive Analysis of Pesticide Pollution across the Yangtze River Basin: Spatiotemporal Distribution, Socio-Economic Correlations, and Ecological Risk Assessment","authors":"Yongchang Xie, Quanzhen Liu, Xiong Xu, Lihua Lin, Weiqing Wang and Donghong Wang*, ","doi":"10.1021/acsestwater.5c0008410.1021/acsestwater.5c00084","DOIUrl":"https://doi.org/10.1021/acsestwater.5c00084https://doi.org/10.1021/acsestwater.5c00084","url":null,"abstract":"As an important grain-producing region in China, the Yangtze River Basin is potentially threatened by pesticide contamination. In this study, occurrence, spatiotemporal distribution, possible drivers, and ecological risks of 40 pesticides including 23 herbicides, 8 insecticides, and 9 bactericides were investigated from Panzhihua to Nanjing of the Yangtze River. Atrazine historical data in the past two decades were used to analyze the impact of socio-economic development on pesticide residues. Results showed higher pesticide concentrations during wet and normal seasons than dry season, with mean concentrations ordered as normal season (182.18 ng/L) > wet season (157.20 ng/L) > dry season (69.65 ng/L). Several pesticides, such as atrazine, gestomine, isoprocarb, dichlorvos, diethyltoluamide, triadimenol, and isoprothiolane were the dominant pesticides with high detection frequency and concentration proportion. In addition, a decline trend of pesticides abundance was found from the Three Gorges to the subsequent section, indicating that the reservoir is likely to act as a sink for pesticide residues. Atrazine historical trends indicated pesticide pollution correlated with urbanization, per capita gross domestic product, and pesticide usage rather than wastewater discharge. Ecological risk assessment using the species sensitivity distribution (SSD) method exhibited that pesticides have no significant risks on aquatic organisms.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 4","pages":"1971–1981 1971–1981"},"PeriodicalIF":4.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New Rapid Methods for Assessing the Production and Removal of Labile Organic Carbon in Water Treatment Using Fluorescence and Oxygen Measurements

IF 4.8

ACS ES&T water Pub Date : 2025-03-28 DOI: 10.1021/acsestwater.5c0015310.1021/acsestwater.5c00153

Aina McEvoy*, Catherine Paul, Oskar Modin, Amir Saeid Mohammadi, Tomas McKelvey and Kathleen Murphy,

{"title":"New Rapid Methods for Assessing the Production and Removal of Labile Organic Carbon in Water Treatment Using Fluorescence and Oxygen Measurements","authors":"Aina McEvoy*, Catherine Paul, Oskar Modin, Amir Saeid Mohammadi, Tomas McKelvey and Kathleen Murphy, ","doi":"10.1021/acsestwater.5c0015310.1021/acsestwater.5c00153","DOIUrl":"https://doi.org/10.1021/acsestwater.5c00153https://doi.org/10.1021/acsestwater.5c00153","url":null,"abstract":"Labile organic carbon is a major nutrient, controlling microbial activity in aquatic ecosystems and contributing to the global cycling of carbon. During the production and distribution of drinking water, labile carbon fractions often escape treatment, which threatens water quality and biostability. This study proposes and compares two rapid methods for monitoring the production and removal of labile organic carbon in freshwater. One method measures the consumption of oxygen by bacteria during their initial exponential growth phase and uses this to predict how much labile organic carbon is present. The other method uses an a priori model of the fluorescence composition of dissolved organic matter to estimate the relative amount of biodegradable carbon fractions. In water treatment plants and in lab-scale experiments, both methods showed selectivity for biodegradable fractions of natural organic matter and indicated similar changes in scale and direction when water samples were exposed to biodegradation, with higher precision for the fluorescence measurement (coefficient of variation ∼1.5%) compared to the oxygen method (coefficient of variation ∼15%). Software is provided to aid in the implementation of these new methods, enabling their exploration and refinement in future studies.Methods are proposed for estimating labile organic carbon concentrations in water from oxygen consumption rates and fluorescence composition.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 4","pages":"1990–2001 1990–2001"},"PeriodicalIF":4.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestwater.5c00153","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Response of Dissolved Organic Matter to Thermal Stratification and Carbon Sink Indication in Drinking Water Reservoirs: Insights from Molecular Weight, Spectroscopy, and Watershed Analysis

IF 4.8

ACS ES&T water Pub Date : 2025-03-27 DOI: 10.1021/acsestwater.4c0110110.1021/acsestwater.4c01101

Chenbin Wu, Yuting Zhao, Jiafeng Zhang, Kun Shi, Shilei Zhou* and Beibei Chai,

{"title":"Response of Dissolved Organic Matter to Thermal Stratification and Carbon Sink Indication in Drinking Water Reservoirs: Insights from Molecular Weight, Spectroscopy, and Watershed Analysis","authors":"Chenbin Wu, Yuting Zhao, Jiafeng Zhang, Kun Shi, Shilei Zhou* and Beibei Chai, ","doi":"10.1021/acsestwater.4c0110110.1021/acsestwater.4c01101","DOIUrl":"https://doi.org/10.1021/acsestwater.4c01101https://doi.org/10.1021/acsestwater.4c01101","url":null,"abstract":"Dissolved organic matter (DOM) plays an important role in drinking water reservoirs. However, the responses of DOM sources and properties to thermal stratification in watersheds with different molecular weights are not well understood. Using the six reservoirs of Luan River, Daqing River, and Hutuo River watersheds as subjects, the distribution characteristics of DOM with different molecular weights and basins were investigated through spectroscopy. The results indicated that the thermoclines in the Wangkuai and Gangnan reservoirs were the thickest (14 m). Three humic-like substances (C1, C2, and C4) and one protein-like substance (C3) were also detected. The fluorescence intensity of the DOM in the epilimnion and thermocline layers was also higher. There was a significant correlation (P < 0.05) between the chemical and thermal stratification indices of the C3 and C4 components. There are significant differences in the stratification of low molecular weight C3 and C4, Chla, BOD5, NO3–, and TN. Environmental factors (T, pH, and DO) were the primary factors affecting the DOM composition in the vertical direction. N and Chla are factors that influence the concentration and sources of DOM in different watersheds. This conclusion enhanced our understanding of the distribution of DOM and carbon sinks.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 4","pages":"1716–1729 1716–1729"},"PeriodicalIF":4.8,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Changes in Dissolved Natural Organic Matter Composition Induced by Reaction with U(VI) at Acidic and Neutral pH

IF 4.8

ACS ES&T water Pub Date : 2025-03-26 DOI: 10.1021/acsestwater.4c0100410.1021/acsestwater.4c01004

Carmen A. Velasco, Jacqueline M. Jarvis, Malak M. Tfaily, Adrian J. Brearley, F. Omar Holguin, Carson Odell Lee, Angelica D. Benavidez, Abdul-Mehdi S. Ali, Juan S. Lezama Pacheco, Stephen E. Cabaniss, Kateryna Artyushkova and José M. Cerrato*,

{"title":"Changes in Dissolved Natural Organic Matter Composition Induced by Reaction with U(VI) at Acidic and Neutral pH","authors":"Carmen A. Velasco, Jacqueline M. Jarvis, Malak M. Tfaily, Adrian J. Brearley, F. Omar Holguin, Carson Odell Lee, Angelica D. Benavidez, Abdul-Mehdi S. Ali, Juan S. Lezama Pacheco, Stephen E. Cabaniss, Kateryna Artyushkova and José M. Cerrato*, ","doi":"10.1021/acsestwater.4c0100410.1021/acsestwater.4c01004","DOIUrl":"https://doi.org/10.1021/acsestwater.4c01004https://doi.org/10.1021/acsestwater.4c01004","url":null,"abstract":"Understanding oxidized uranium [U(VI)] reactions with natural organic matter (NOM) is necessary to predict the solubility and mobility of U and NOM in waters from organically rich geologic uranium deposits influenced by natural and anthropogenic processes. Here, we investigated the changes in the chemical composition of NOM resulting from its reaction with U(VI) under acidic and neutral pH under controlled laboratory conditions. We employed a multianalytical approach, including X-ray photoelectron spectroscopy (XPS), Fourier transform ion cyclotron resonance-mass spectrometry (FTICR-MS), transmission electron microscopy (TEM), and X-ray absorption spectroscopy (XAS). Results revealed that U(VI) reaction at acidic pH led to a decrease in the relative content of alcohols, carboxylic functional groups, and compounds with high O/C ratios in NOM. Our integrated analyses suggest that NOM’s molecular composition is altered by two primary mechanisms: (1) selective aqueous complexation of U with alcohol and carboxylic groups in NOM and (2) U adsorption onto particulate organic matter (POM). These findings provide insights into NOM chemical transformations due to U interactions under pH conditions relevant to acid mine drainage, natural geologic deposits, and surface waters affected by legacy uranium mining.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 4","pages":"1652–1662 1652–1662"},"PeriodicalIF":4.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessing Passive Sampling for the Monitoring of E. coli and Cryptosporidium spp. in Environmental Waters

IF 4.8

ACS ES&T water Pub Date : 2025-03-25 DOI: 10.1021/acsestwater.4c0102910.1021/acsestwater.4c01029

Ilya Law, Erin Becker, Brandon S. Spoja, Katrina Kobal, Martha Yiridoe, Abdul Alashraf, Beth L. Parker, David T. McCarthy and Heather M. Murphy*,

{"title":"Assessing Passive Sampling for the Monitoring of E. coli and Cryptosporidium spp. in Environmental Waters","authors":"Ilya Law, Erin Becker, Brandon S. Spoja, Katrina Kobal, Martha Yiridoe, Abdul Alashraf, Beth L. Parker, David T. McCarthy and Heather M. Murphy*, ","doi":"10.1021/acsestwater.4c0102910.1021/acsestwater.4c01029","DOIUrl":"https://doi.org/10.1021/acsestwater.4c01029https://doi.org/10.1021/acsestwater.4c01029","url":null,"abstract":"Passive sampling has shown promise as an alternative approach for monitoring of pathogens in aquatic matrices. We conducted two controlled experiments to compare the efficacy of membrane passive sampling to composite sampling in both wastewater and surface water for the detection of Escherichia coli and Cryptosporidium. We also investigated the relative uptake of E. coli and Cryptosporidium onto membrane passive samplers over time. Both sampling methods returned positive detections of E. coli at all deployment times (4, 8, 24, 48, 72, and 96 h) in both water matrices. Passive sampling for Cryptosporidium showed similar detection rates as composite samples in surface water (31% passive; 41% composite) and wastewater (76% passive; 86% composite). We found significant linear uptake of E. coli onto passive samplers up to 96 h in surface water (R2 = 0.932; p = 0.002). In wastewater, maximum passive sampler uptake of E. coli was reached after 24 h. For Cryptosporidium, linear uptake was observed up to 96 h for both surface water (R2 = 0.805; p = 0.015) and wastewater (R2 = 0.877; p = 0.006). Our results support that membrane passive samplers may be used for the detection of Cryptosporidium and E. coli in surface waters for up to 96 h.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 4","pages":"1673–1682 1673–1682"},"PeriodicalIF":4.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nutrient Condition-Induced Mechanism Shift of Microbial Manganese Oxidation: Significance of Catalase

IF 4.8

ACS ES&T water Pub Date : 2025-03-25 DOI: 10.1021/acsestwater.4c0125310.1021/acsestwater.4c01253

Jing Qi, Zemiao Lin, Xi Wang, Rashmi Koju, Yu Zhao, Hongwei Yu, Baiwen Ma, Chengzhi Hu* and Jiuhui Qu,

{"title":"Nutrient Condition-Induced Mechanism Shift of Microbial Manganese Oxidation: Significance of Catalase","authors":"Jing Qi, Zemiao Lin, Xi Wang, Rashmi Koju, Yu Zhao, Hongwei Yu, Baiwen Ma, Chengzhi Hu* and Jiuhui Qu, ","doi":"10.1021/acsestwater.4c0125310.1021/acsestwater.4c01253","DOIUrl":"https://doi.org/10.1021/acsestwater.4c01253https://doi.org/10.1021/acsestwater.4c01253","url":null,"abstract":"Manganese-oxidizing bacteria facilitate manganese oxide formation through direct and indirect oxidation pathways. While nutrient conditions are known to significantly influence microbial metabolism, their impact on microbial manganese oxidation remains unclear. In this study, we explored the microbial manganese oxidation process under varying nutrient conditions. Under eutrophic and mesotrophic conditions, Mn(II) oxidation primarily occurred during the stationary phase, whereas no manganese oxides were detected under oligotrophic conditions. Extracellular superoxide radicals (O2•–) were identified as the primary drivers of the manganese oxidation process under oligotrophic conditions. However, O2•– reacted with Mn(II) to form hydrogen peroxide (H2O2) and Mn(III), with subsequent consumption of H2O2 in the reaction with Mn(III), regenerating Mn(II). The addition of catalase (CAT) significantly enhanced Mn(III) production under oligotrophic conditions, reaching a maximum UV258 value of 0.24 at 16 h, suggesting that CAT could promote Mn(III) accumulation by consuming H2O2, thus increasing the rate of manganese oxide formation. In contrast, under nutrient-rich conditions, manganese oxidation was primarily mediated by multicopper oxidases, where Mn(III) was further oxidized to manganese oxides. Our work highlights the critical role of nutrient conditions in microbial manganese oxidation, which can significantly affect the transformation of manganese in the environment and the effectiveness of water treatment processes.","PeriodicalId":93847,"journal":{"name":"ACS ES&T water","volume":"5 4","pages":"1907–1915 1907–1915"},"PeriodicalIF":4.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0