Pub Date : 2026-02-10DOI: 10.1016/j.watres.2026.125539
Charlotte Lafont, Stéphane Vaxelaire, Alexandre Gelabert, Catherine Joulian, Hugues Thouin, Frédéric Duré, Mickael Charron, Josselin Gorny, Delphine Vantelon, Fabienne Battaglia-Brunet, Éric D. van Hullebusch
Manganese (Mn) removal in passive mine water treatment remains a challenge due to its slow oxidation kinetics, requiring specific biogeochemical conditions. Constructed wetlands are often the key functional units enabling Mn removal in full-scale passive treatment plants. This study examines the key biogeochemical factors influencing Mn removal in a full-scale passive mine water treatment plant located in Alès (South-East France). Over one year, monitoring of physicochemical parameters, microbial communities, and Mn speciation in solid phases was conducted every two months. Results highlight temporal variations in Mn removal efficiency, with two main mechanisms identified: (1) Mn carbonate (MnCO₃) precipitation, likely influenced by high carbonate concentrations in mine water, and (2) Mn oxide (δ-MnO₂) formation, mainly associated with reed rhizosphere, where it accumulates as mineral plaque. In mine water, Mn removal correlates with Fe particle concentrations, suggesting a catalytic effect, as well as with alkalinity and the abundance of microorganisms affiliated to Alteromonadaceae, suggesting a microbial influence. Mn removal appears to be primarily abiotic, driven by favourable pH and alkaline conditions that promote Mn carbonate precipitation, by autocatalytic oxidation reactions occurring on rhizosphere surfaces and by plant’s design including surface area and hydrological conditions. Microbial communities may facilitate certain Mn removal processes depending on environmental conditions.
{"title":"Manganese removal in a full-scale constructed wetland for passive mine water treatment: environmental factors and microbial communities","authors":"Charlotte Lafont, Stéphane Vaxelaire, Alexandre Gelabert, Catherine Joulian, Hugues Thouin, Frédéric Duré, Mickael Charron, Josselin Gorny, Delphine Vantelon, Fabienne Battaglia-Brunet, Éric D. van Hullebusch","doi":"10.1016/j.watres.2026.125539","DOIUrl":"https://doi.org/10.1016/j.watres.2026.125539","url":null,"abstract":"Manganese (Mn) removal in passive mine water treatment remains a challenge due to its slow oxidation kinetics, requiring specific biogeochemical conditions. Constructed wetlands are often the key functional units enabling Mn removal in full-scale passive treatment plants. This study examines the key biogeochemical factors influencing Mn removal in a full-scale passive mine water treatment plant located in Alès (South-East France). Over one year, monitoring of physicochemical parameters, microbial communities, and Mn speciation in solid phases was conducted every two months. Results highlight temporal variations in Mn removal efficiency, with two main mechanisms identified: (1) Mn carbonate (MnCO₃) precipitation, likely influenced by high carbonate concentrations in mine water, and (2) Mn oxide (δ-MnO₂) formation, mainly associated with reed rhizosphere, where it accumulates as mineral plaque. In mine water, Mn removal correlates with Fe particle concentrations, suggesting a catalytic effect, as well as with alkalinity and the abundance of microorganisms affiliated to <em>Alteromonadaceae</em>, suggesting a microbial influence. Mn removal appears to be primarily abiotic, driven by favourable pH and alkaline conditions that promote Mn carbonate precipitation, by autocatalytic oxidation reactions occurring on rhizosphere surfaces and by plant’s design including surface area and hydrological conditions. Microbial communities may facilitate certain Mn removal processes depending on environmental conditions.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"211 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-09DOI: 10.1016/j.watres.2026.125546
Xinlei Wang, Tao Ding, Mianping Zheng, Denghong Wang, Zhen Nie, Gao Song
Driven by the global transition to low-carbon energy and the rapid development of the electric vehicle industry, the finite supply of lithium (Li) resources coupled with growing demand will exacerbate the imbalance between supply and demand. Current Li supply primarily relies on traditional resources such as salt lake brines and hard-rock ores. However, these resources exhibit concentrated geographic distribution and incur high environmental costs, posing severe constraints on sustainable resource utilization and supply chain security. Oil and gas produced water (OGPW), a persistent byproduct of hydrocarbon extraction, is regarded as a highly promising unconventional Li resource due to its widespread distribution and Li content far exceeding industrial-grade standards. Compared to traditional salt lake brines, OGPW exhibits characteristics such as low Li concentrations, high salinity, complex ionic compositions, abundant organic contaminants, and harsh field conditions, which substantially increase the technical difficulty of Li extraction. This review systematically summarizes recent advances in Li extraction technologies, covering evaporation-precipitation, solvent extraction, adsorption, membrane separation, and electrochemical technologies, while critically evaluating their applicability to OGPW under complex compositions and field conditions. The study emphasizes that efficient Li recovery from OGPW cannot rely on a single extraction technology. Instead, customized integrated process designs are required, combining complementary separation mechanisms to address the complex composition and field conditions of OGPW. Future research should focus on developing integrated process systems that synergistically achieve Li extraction and water treatment, thereby fulfilling dual objectives of resource recovery and environmental management.
{"title":"Lithium extraction from oil and gas produced water: resource characteristics, technological challenges and future perspectives","authors":"Xinlei Wang, Tao Ding, Mianping Zheng, Denghong Wang, Zhen Nie, Gao Song","doi":"10.1016/j.watres.2026.125546","DOIUrl":"https://doi.org/10.1016/j.watres.2026.125546","url":null,"abstract":"Driven by the global transition to low-carbon energy and the rapid development of the electric vehicle industry, the finite supply of lithium (Li) resources coupled with growing demand will exacerbate the imbalance between supply and demand. Current Li supply primarily relies on traditional resources such as salt lake brines and hard-rock ores. However, these resources exhibit concentrated geographic distribution and incur high environmental costs, posing severe constraints on sustainable resource utilization and supply chain security. Oil and gas produced water (OGPW), a persistent byproduct of hydrocarbon extraction, is regarded as a highly promising unconventional Li resource due to its widespread distribution and Li content far exceeding industrial-grade standards. Compared to traditional salt lake brines, OGPW exhibits characteristics such as low Li concentrations, high salinity, complex ionic compositions, abundant organic contaminants, and harsh field conditions, which substantially increase the technical difficulty of Li extraction. This review systematically summarizes recent advances in Li extraction technologies, covering evaporation-precipitation, solvent extraction, adsorption, membrane separation, and electrochemical technologies, while critically evaluating their applicability to OGPW under complex compositions and field conditions. The study emphasizes that efficient Li recovery from OGPW cannot rely on a single extraction technology. Instead, customized integrated process designs are required, combining complementary separation mechanisms to address the complex composition and field conditions of OGPW. Future research should focus on developing integrated process systems that synergistically achieve Li extraction and water treatment, thereby fulfilling dual objectives of resource recovery and environmental management.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"7 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-09DOI: 10.1016/j.watres.2026.125541
Mohsin Uddin, Jiale Xu
UV-based advanced oxidation process (AOP) is critical for wastewater recycling to control organic micropollutants (e.g., 1,4-dioxane) that remain in reverse osmosis permeates. Krypton chloride excimer lamp emitting at far-UVC 222 nm (UV222) is promising for water treatment. This study demonstrated that far-UVC light enhanced UV/NH2Cl compared with traditional low-pressure UV (LPUV) at 254 nm (UV254) for wastewater recycling. Its impacts on 1,4-dioxane (1,4-D) removal, radical steady-state concentrations, and DBP formation were assessed. A low fluence rate of 0.31 mW/cm2 was used due to fast photolysis of NH2Cl at 222 nm. UV222/NH2Cl at 50 mg Cl2/L exhibited a 1,4-D decay rate constant at 1.7 × 10-3 cm2/mJ, 17.2 times higher than UV254/NH2Cl. Far UVC at 222 nm also increased the direct photolysis rate of 1,4-D by 12-fold over LPUV. UV222/NH2Cl showed higher 1,4-D removal than UV222/NHCl2, followed by UV222/H2O2. Mechanistic investigation revealed that steady-state concentrations of •OH and Cl2•- from UV222/NH2Cl were 12 and 31 times higher than those from UV254/NH2Cl, respectively. Experiments using wastewater RO permeate, RO concentrate, and tap water showed that UV222/NH2Cl consistently achieved efficient control of 1,4-D even in complex matrices. UV222/NH2Cl exhibited slightly higher or similar risk compared with UV254/NH2Cl in generating precursors of disinfection byproducts. Overall, KrCl* excilamps-based AOP using NH2Cl provided efficient contaminant removal in wastewater recycling and merits further research.
{"title":"Far UVC (222 nm) Enhances Chloramine-Based Advanced Oxidation in Wastewater Recycling: 1,4-Dioxane Removal, Radical Generation, and DBP Formation","authors":"Mohsin Uddin, Jiale Xu","doi":"10.1016/j.watres.2026.125541","DOIUrl":"https://doi.org/10.1016/j.watres.2026.125541","url":null,"abstract":"UV-based advanced oxidation process (AOP) is critical for wastewater recycling to control organic micropollutants (e.g., 1,4-dioxane) that remain in reverse osmosis permeates. Krypton chloride excimer lamp emitting at far-UVC 222 nm (UV<sub>222</sub>) is promising for water treatment. This study demonstrated that far-UVC light enhanced UV/NH<sub>2</sub>Cl compared with traditional low-pressure UV (LPUV) at 254 nm (UV<sub>254</sub>) for wastewater recycling. Its impacts on 1,4-dioxane (1,4-D) removal, radical steady-state concentrations, and DBP formation were assessed. A low fluence rate of 0.31 mW/cm<sup>2</sup> was used due to fast photolysis of NH<sub>2</sub>Cl at 222 nm. UV<sub>222</sub>/NH<sub>2</sub>Cl at 50 mg Cl<sub>2</sub>/L exhibited a 1,4-D decay rate constant at 1.7 × 10<sup>-3</sup> cm<sup>2</sup>/mJ, 17.2 times higher than UV<sub>254</sub>/NH<sub>2</sub>Cl. Far UVC at 222 nm also increased the direct photolysis rate of 1,4-D by 12-fold over LPUV. UV<sub>222</sub>/NH<sub>2</sub>Cl showed higher 1,4-D removal than UV<sub>222</sub>/NHCl<sub>2</sub>, followed by UV<sub>222</sub>/H<sub>2</sub>O<sub>2</sub>. Mechanistic investigation revealed that steady-state concentrations of <sup>•</sup>OH and Cl<sub>2</sub><sup>•-</sup> from UV<sub>222</sub>/NH<sub>2</sub>Cl were 12 and 31 times higher than those from UV<sub>254</sub>/NH<sub>2</sub>Cl, respectively. Experiments using wastewater RO permeate, RO concentrate, and tap water showed that UV<sub>222</sub>/NH<sub>2</sub>Cl consistently achieved efficient control of 1,4-D even in complex matrices. UV<sub>222</sub>/NH<sub>2</sub>Cl exhibited slightly higher or similar risk compared with UV<sub>254</sub>/NH<sub>2</sub>Cl in generating precursors of disinfection byproducts. Overall, KrCl* excilamps-based AOP using NH<sub>2</sub>Cl provided efficient contaminant removal in wastewater recycling and merits further research.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"39 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-09DOI: 10.1016/j.watres.2026.125544
Section snippets
Why We Use Up-Front Rejections
Up-front rejections filter out manuscripts unlikely to meet Water Research’s quality or scope requirements before peer review. This ensures efficient use of reviewer time and provides authors with swift decisions, allowing faster resubmission elsewhere. While authors may receive brief editorial feedback rather than detailed reviewer comments, this accelerates the process. We strive for fair decisions but acknowledge occasional errors and apologize for any oversight. Our goal is to balance the
Common Reasons for Up-Front Rejection
•Lack of Novelty or Research Significance: Papers must offer original contributions, avoiding incremental results or "salami slicing" (splitting findings across multiple submissions). Submissions should demonstrate significant advancements in water research.
•Out of Scope: Water Research is an interdisciplinary journal emphasizing applied water-related research. Papers focusing on supporting disciplines (e.g., chemistry, microbiology, toxicology, material science) without clear, practical
Aligning with Water Research’s Scope
Water Research prioritizes interdisciplinary, applied research that advances the understanding and management of water-related challenges. Submissions should clearly demonstrate relevance to the journal’s mission and audience. Papers narrowly focused on a single discipline without connecting to broader water research themes are unlikely to be accepted. The journal focuses on the anthropogenic water system (water resources, drinking water treatment, water distribution, wastewater collection and
Tips for a Successful Submission
•Present novel, impactful, and generalizable findings supported by robust data.
•Clearly articulate how your work aligns with Water Research’s interdisciplinary and applied focus.
•Provide a strong literature foundation with diverse, relevant citations.
•Include a clear statement of research goals at the end of the introduction.
•Ensure the conclusion delivers a clear take-home message derived from your work.
•Submit a concise, well-written manuscript that adheres to author guidelines.
{"title":"Avoiding Up-Front Rejection: Why Your Paper May Not Be Suitable for Water Research","authors":"","doi":"10.1016/j.watres.2026.125544","DOIUrl":"https://doi.org/10.1016/j.watres.2026.125544","url":null,"abstract":"<h2>Section snippets</h2><section><section><h2>Why We Use Up-Front Rejections</h2>Up-front rejections filter out manuscripts unlikely to meet Water Research’s quality or scope requirements before peer review. This ensures efficient use of reviewer time and provides authors with swift decisions, allowing faster resubmission elsewhere. While authors may receive brief editorial feedback rather than detailed reviewer comments, this accelerates the process. We strive for fair decisions but acknowledge occasional errors and apologize for any oversight. Our goal is to balance the</section></section><section><section><h2>Common Reasons for Up-Front Rejection</h2><ul><li><span>•</span><span>Lack of Novelty or Research Significance: Papers must offer original contributions, avoiding incremental results or \"salami slicing\" (splitting findings across multiple submissions). Submissions should demonstrate significant advancements in water research.</span></li><li><span>•</span><span>Out of Scope: Water Research is an interdisciplinary journal emphasizing applied water-related research. Papers focusing on supporting disciplines (e.g., chemistry, microbiology, toxicology, material science) without clear, practical</span></li></ul></section></section><section><section><h2>Aligning with Water Research’s Scope</h2>Water Research prioritizes interdisciplinary, applied research that advances the understanding and management of water-related challenges. Submissions should clearly demonstrate relevance to the journal’s mission and audience. Papers narrowly focused on a single discipline without connecting to broader water research themes are unlikely to be accepted. The journal focuses on the anthropogenic water system (water resources, drinking water treatment, water distribution, wastewater collection and</section></section><section><section><h2>Tips for a Successful Submission</h2><ul><li><span>•</span><span>Present novel, impactful, and generalizable findings supported by robust data.</span></li><li><span>•</span><span>Clearly articulate how your work aligns with Water Research’s interdisciplinary and applied focus.</span></li><li><span>•</span><span>Provide a strong literature foundation with diverse, relevant citations.</span></li><li><span>•</span><span>Include a clear statement of research goals at the end of the introduction.</span></li><li><span>•</span><span>Ensure the conclusion delivers a clear take-home message derived from your work.</span></li><li><span>•</span><span>Submit a concise, well-written manuscript that adheres to author guidelines.</span></li><li><span>•</span><span>Avoid common</span></li></ul></section></section>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"109 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146138847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-09DOI: 10.1016/j.watres.2026.125540
Wenshuo Yang, Yukun Du, Deyuan Jin, Wenqing Tian, Mingyue Li, Jidong Liang, Pengkang Jin
Semi-coking wastewater (SCWW) contains toxic compounds that threaten both human health and ecosystem integrity. In this study, an anaerobic ammonium oxidation (anammox)-based simultaneous partial nitrification, anammox, and denitrification (SNAD) process, enhanced with a novel polyvinyl alcohol/phytic acid/iron (PVA/PA/Fe) hydrogel carrier, was evaluated for treating actual SCWW. During long-term operation, the system achieved removal efficiencies of 90.8% for ammonium nitrogen (NH4+–N) and 91.4% for chemical oxygen demand (COD) in SCWW. The PVA/PA/Fe carrier facilitated sludge aggregation, enhanced extracellular polymeric substance secretion, and successfully enriched key functional microbes, encompassing anammox bacterium Candidatus Brocadia and phenol-degrading denitrifier Ottowia. Acute toxicity assays and nitrogen removal inhibition tests identified phenyl cyanate as a major toxicant in SCWW. Molecular docking confirmed its strong binding affinity for critical enzymes such as hydroxylamine oxidoreductase (Hao) and nitric oxide reductase (Nor). Adsorption experiments and density functional theory (DFT) calculations revealed that the PVA/PA/Fe effectively adsorbed phenyl cyanate via Fe-mediated coordination, with an adsorption capacity of 10.59 mg g–1. This capacity was sixfold greater than that of the unmodified carrier, substantially lowering the environmental concentration of phenyl cyanate and alleviating its inhibitory effect. Collectively, these findings provide a viable carrier-enhanced strategy for the biological treatment of SCWW.
{"title":"Detoxification mechanism of semi-coking wastewater by hydrogel-assisted SNAD process via iron‑mediated coordination adsorption: Performance, microbiota interaction, and molecular docking","authors":"Wenshuo Yang, Yukun Du, Deyuan Jin, Wenqing Tian, Mingyue Li, Jidong Liang, Pengkang Jin","doi":"10.1016/j.watres.2026.125540","DOIUrl":"https://doi.org/10.1016/j.watres.2026.125540","url":null,"abstract":"Semi-coking wastewater (SCWW) contains toxic compounds that threaten both human health and ecosystem integrity. In this study, an anaerobic ammonium oxidation (anammox)-based simultaneous partial nitrification, anammox, and denitrification (SNAD) process, enhanced with a novel polyvinyl alcohol/phytic acid/iron (PVA/PA/Fe) hydrogel carrier, was evaluated for treating actual SCWW. During long-term operation, the system achieved removal efficiencies of 90.8% for ammonium nitrogen (NH<sub>4</sub><sup>+</sup>–N) and 91.4% for chemical oxygen demand (COD) in SCWW. The PVA/PA/Fe carrier facilitated sludge aggregation, enhanced extracellular polymeric substance secretion, and successfully enriched key functional microbes, encompassing anammox bacterium <em>Candidatus</em> Brocadia and phenol-degrading denitrifier <em>Ottowia</em>. Acute toxicity assays and nitrogen removal inhibition tests identified phenyl cyanate as a major toxicant in SCWW. Molecular docking confirmed its strong binding affinity for critical enzymes such as hydroxylamine oxidoreductase (<em>Hao</em>) and nitric oxide reductase (<em>Nor</em>). Adsorption experiments and density functional theory (DFT) calculations revealed that the PVA/PA/Fe effectively adsorbed phenyl cyanate via Fe-mediated coordination, with an adsorption capacity of 10.59 mg g<sup>–1</sup>. This capacity was sixfold greater than that of the unmodified carrier, substantially lowering the environmental concentration of phenyl cyanate and alleviating its inhibitory effect. Collectively, these findings provide a viable carrier-enhanced strategy for the biological treatment of SCWW.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"1 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-07DOI: 10.1016/j.watres.2026.125531
Lunhui Lu, Xingqian Jian, Shanshan Lin, Zhe Li, Qiong Tang, Yan Xiao, Yuanyuan Zhang, Dianchang Wang
Microbial communities in river ecosystems regulate biogeochemical cycling and serve as natural bioremediators for environmental pollutants. However, accurately predicting their dynamic responses to changing conditions remains a significant scientific challenge because of the complexity of microbial interactions and ecosystem-scale feedbacks. Here, a novel compositional neural encoder-decoder (cNED) framework was developed, coupling environmental variables with microbial profiles based on an extensive collection of 473 samples from the upper Yangtze River. A total of 157 core bacterial OTUs were identified from 27,932 OTUs by the occupancy-frequency method, which were predominantly governed by deterministic assembly processes. The identified core microbiome demonstrated significant functional associations with carbon and nitrogen cycling. Compared with conventional modeling approaches (multilayer perceptron, random forests, linear regression), the cNED framework demonstrated superior predictive performance, achieving high accuracy in taxonomic prediction and functional profile prediction (carbon cycling: R² = 0.85; nitrogen cycling: R² = 0.52). The Shapley additive explanations (SHAP) analysis identified spatial gradients and temperature as key environmental drivers. Generalized Additive Models uncovered phylum- and function-specific tipping points: Proteobacteria exhibited a dual-threshold thermal niche (20.5–27 °C), while functions like methylotrophy and nitrogen fixation responded nonlinearly to temperature and TN, revealing unimodal or monotonic transitions. The cNED framework developed in this study establishes an interpretable predictive framework for forecasting microbial community and functional responses to environmental perturbations, offering valuable insights for evidence-based river ecosystem management and climate adaptation strategies.
{"title":"The cNED framework: modeling core microbial communities and metabolic functions with SHAP-interpretable environmental thresholds in large rivers","authors":"Lunhui Lu, Xingqian Jian, Shanshan Lin, Zhe Li, Qiong Tang, Yan Xiao, Yuanyuan Zhang, Dianchang Wang","doi":"10.1016/j.watres.2026.125531","DOIUrl":"https://doi.org/10.1016/j.watres.2026.125531","url":null,"abstract":"Microbial communities in river ecosystems regulate biogeochemical cycling and serve as natural bioremediators for environmental pollutants. However, accurately predicting their dynamic responses to changing conditions remains a significant scientific challenge because of the complexity of microbial interactions and ecosystem-scale feedbacks. Here, a novel compositional neural encoder-decoder (cNED) framework was developed, coupling environmental variables with microbial profiles based on an extensive collection of 473 samples from the upper Yangtze River. A total of 157 core bacterial OTUs were identified from 27,932 OTUs by the occupancy-frequency method, which were predominantly governed by deterministic assembly processes. The identified core microbiome demonstrated significant functional associations with carbon and nitrogen cycling. Compared with conventional modeling approaches (multilayer perceptron, random forests, linear regression), the cNED framework demonstrated superior predictive performance, achieving high accuracy in taxonomic prediction and functional profile prediction (carbon cycling: R² = 0.85; nitrogen cycling: R² = 0.52). The Shapley additive explanations (SHAP) analysis identified spatial gradients and temperature as key environmental drivers. Generalized Additive Models uncovered phylum- and function-specific tipping points: <em>Proteobacteria</em> exhibited a dual-threshold thermal niche (20.5–27 °C), while functions like methylotrophy and nitrogen fixation responded nonlinearly to temperature and TN, revealing unimodal or monotonic transitions. The cNED framework developed in this study establishes an interpretable predictive framework for forecasting microbial community and functional responses to environmental perturbations, offering valuable insights for evidence-based river ecosystem management and climate adaptation strategies.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"70 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2026-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146129685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Unveiling the environmental fate and risks of non-heterocyclic sulfacetamide: From a novel degradation mechanism to microecological effects","authors":"Guoqiang Zhao, Wenjing Chen, Wanying Zhang, Rui Zhang, Xing Huang","doi":"10.1016/j.watres.2026.125520","DOIUrl":"https://doi.org/10.1016/j.watres.2026.125520","url":null,"abstract":"","PeriodicalId":443,"journal":{"name":"Water Research","volume":"73 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2026-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The development of green, high-efficiency biocides is critical for the effective control of microbial biofilms in water treatment processes. In this study, lignin nanoparticles (NPs), with an average size of around 30 nm, were synthesized via a ‘green’ process and applied as biocides. A gravity-driven ultrafiltration membrane system was employed to investigate their effects on biofilm composition. The results showed that when the dosage of lignin NPs was only 1 mg C/L, the abundances of bacteria and fungi in the membrane biofilms were reduced by more than 98%, and the total protein and polysaccharide contents in the extracellular polymeric substance (EPS) decreased significantly, demonstrating remarkable advantages. The core antimicrobial mechanism involves two synergistic effects: (1) Hydrogen bonds are formed between the hydrophilic carboxyl groups on lignin nanoparticles (NPs) and EPS-components of microbial cell walls, directly inhibiting microbial viability and proliferation while reducing EPS secretion; (2) Lignin NPs are oxidized to aromatic derivatives, with benzene rings converted into hydroxyl-enriched phenolic structures, and the concurrent elevation of carbonyl (C=O) groups in extracellular proteins enhances hydrophobicity. The oxidized lignin NPs then amplify antimicrobial efficacy via hydrophobic associations with these modified aromatic compounds and proteins. This work provides a novel approach and new insights into the rational design of green biocides and the regulation of membrane biofilms.
{"title":"Impacts of lignin nanoparticles as antibacterial agents on the composition of biofilms in water treatment","authors":"Jiesi Zhang, Yufei Li, Nigel Graham, Minmin Liu, Wenzheng Yu","doi":"10.1016/j.watres.2026.125533","DOIUrl":"https://doi.org/10.1016/j.watres.2026.125533","url":null,"abstract":"The development of green, high-efficiency biocides is critical for the effective control of microbial biofilms in water treatment processes. In this study, lignin nanoparticles (NPs), with an average size of around 30 nm, were synthesized via a ‘green’ process and applied as biocides. A gravity-driven ultrafiltration membrane system was employed to investigate their effects on biofilm composition. The results showed that when the dosage of lignin NPs was only 1 mg C/L, the abundances of bacteria and fungi in the membrane biofilms were reduced by more than 98%, and the total protein and polysaccharide contents in the extracellular polymeric substance (EPS) decreased significantly, demonstrating remarkable advantages. The core antimicrobial mechanism involves two synergistic effects: (1) Hydrogen bonds are formed between the hydrophilic carboxyl groups on lignin nanoparticles (NPs) and EPS-components of microbial cell walls, directly inhibiting microbial viability and proliferation while reducing EPS secretion; (2) Lignin NPs are oxidized to aromatic derivatives, with benzene rings converted into hydroxyl-enriched phenolic structures, and the concurrent elevation of carbonyl (C=O) groups in extracellular proteins enhances hydrophobicity. The oxidized lignin NPs then amplify antimicrobial efficacy via hydrophobic associations with these modified aromatic compounds and proteins. This work provides a novel approach and new insights into the rational design of green biocides and the regulation of membrane biofilms.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"30 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2026-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146129686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-02-07DOI: 10.1016/j.watres.2026.125532
Weichen Wang, Guowangchen Liu, Mingjing Wang, Yan Pan, Yukun Ma, Lu Yang, Jing Sang, Zhenyao Shen, Lei Chen
Water-quality management requires high-frequency monitoring data, which remains challenging, especially in watersheds exhibit pronounced spatial heterogeneity and sparse monitoring stations. To address this gap, this study proposes a Process-Model-Informed Graph Attention Network (PMIGAT) that integrates in situ observations and process-based variables from a process-based model, and implements intermittent satellite-retrieved water quality data as weak supervision to improve predictions at ungauged reaches. A similarity-guided graph attention module is further introduced to enable targeted transfer of supervisory information from monitored nodes to ungauged reaches based on hydrological and landscape similarity. The proposed method was evaluated for nitrogen simulation in the Hangbu River Basin, China. Results showed that the Kling–Gupta efficiency (KGE) at continuously monitored reaches was 0.66, and the median KGE at sparsely gauged reaches reached 0.60 on dates with satellite retrievals. On ungauged reaches on dates without satellite retrievals, PMIGAT outperformed the process-based model, such as Soil and Water Assessment Tool (SWAT), increasing R² from 0.01 to 0.46 and reducing the mean absolute percentage error (MAPE) from 64% to 26%. Furthermore, the new method also improved the detection of high-concentration events with critical success index increasing from 0.04 to 0.28, and the relative peak error decreasing from 60% to 13%. Ablation analyses indicated that satellite retrievals contributed the largest gains at sparsely gauged reaches, and its synergy with similarity-guided graph attention module strengthened with higher satellite availability, shorter along-river distance to the outlet, and greater land-surface similarity. The method can generate spatiotemporally daily water-quality data despite intermittent monitoring, supporting accurate hotspot identification and watershed management.
{"title":"Improving watershed-scale daily nutrient simulation using a process-model-informed graph attention network with multi-source data integration","authors":"Weichen Wang, Guowangchen Liu, Mingjing Wang, Yan Pan, Yukun Ma, Lu Yang, Jing Sang, Zhenyao Shen, Lei Chen","doi":"10.1016/j.watres.2026.125532","DOIUrl":"https://doi.org/10.1016/j.watres.2026.125532","url":null,"abstract":"Water-quality management requires high-frequency monitoring data, which remains challenging, especially in watersheds exhibit pronounced spatial heterogeneity and sparse monitoring stations. To address this gap, this study proposes a Process-Model-Informed Graph Attention Network (PMIGAT) that integrates in situ observations and process-based variables from a process-based model, and implements intermittent satellite-retrieved water quality data as weak supervision to improve predictions at ungauged reaches. A similarity-guided graph attention module is further introduced to enable targeted transfer of supervisory information from monitored nodes to ungauged reaches based on hydrological and landscape similarity. The proposed method was evaluated for nitrogen simulation in the Hangbu River Basin, China. Results showed that the Kling–Gupta efficiency (KGE) at continuously monitored reaches was 0.66, and the median KGE at sparsely gauged reaches reached 0.60 on dates with satellite retrievals. On ungauged reaches on dates without satellite retrievals, PMIGAT outperformed the process-based model, such as Soil and Water Assessment Tool (SWAT), increasing R² from 0.01 to 0.46 and reducing the mean absolute percentage error (MAPE) from 64% to 26%. Furthermore, the new method also improved the detection of high-concentration events with critical success index increasing from 0.04 to 0.28, and the relative peak error decreasing from 60% to 13%. Ablation analyses indicated that satellite retrievals contributed the largest gains at sparsely gauged reaches, and its synergy with similarity-guided graph attention module strengthened with higher satellite availability, shorter along-river distance to the outlet, and greater land-surface similarity. The method can generate spatiotemporally daily water-quality data despite intermittent monitoring, supporting accurate hotspot identification and watershed management.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"45 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2026-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146129687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：