Water ResearchPub Date : 2025-01-22DOI: 10.1016/j.watres.2025.123188
Yalan Gan, Futoshi Kurisu, Dai Simazaki, Mitsunori Yoshida, Hanako Fukano, Takeshi Komine, Hiromi Nagashima, Yoshihiko Hoshino, Ikuro Kasuga
{"title":"Unveiling Significant Regrowth and Potential Risk of Nontuberculous Mycobacteria in Hospital Water Supply System","authors":"Yalan Gan, Futoshi Kurisu, Dai Simazaki, Mitsunori Yoshida, Hanako Fukano, Takeshi Komine, Hiromi Nagashima, Yoshihiko Hoshino, Ikuro Kasuga","doi":"10.1016/j.watres.2025.123188","DOIUrl":"https://doi.org/10.1016/j.watres.2025.123188","url":null,"abstract":"The health burden of waterborne nontuberculous mycobacteria (NTM) is a rising concern. While the water supply systems can serve as a potential reservoir for NTM, their abundance, diversity, and transmission pathways remain unknown. This study aimed to characterize the prevalence and regrowth of NTM in building water supply system in a hospital where many <em>M. abscessus</em> were isolated from patients. The depletion of residual chlorine after stagnation and supply of warm water at the point of use promoted significant microbial regrowth, including NTM, in the hospital. The absolute abundance of <em>Mycobacterium</em> spp. 16S rRNA genes in tap water and shower water samples increased to approximately 10<sup>4</sup> copies/mL, while it was below the quantification limit in the finished water from a drinking water treatment plant. Amplicon sequencing of NTM-specific <em>hsp</em>65 genes revealed that <em>M. abscessus</em> was prevalent in all samples, while the dominant NTM species varied depending on locations even in the same building. The presence of <em>M. abscessus</em> in water suggested the possibility of waterborne transmission in the hospital. <em>M. abscessus</em> was frequently isolated from tap water, shower water, and shower biofilms. These isolates demonstrated high clonality and were closely affiliated with the ABS-GL4 cluster of <em>M. abscessus</em> subsp. <em>abscessus</em>. Even though the automatic mixing equipment at the point of use was replaced with new one, the settlement and growth of NTM were reproducibly observed, suggesting mixing equipment as a hotspot for NTM proliferation. Additional interventions including water quality control are required as the hospital water supply system is a hot spot for NTM regrowth.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"120 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992497","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":"Highly Efficient Removal of Per- and Polyfluoroalkyl Substances by Extrusion-regenerated Aminated Polyurethane Sponges","authors":"Xinhao Wang, Hanyang Chen, Wenran Wang, Xiufang Shen, Jiabao Wang, Sen Chen, Xueru Yu, Chew Tin Lee, Zhanghao Chen, Cheng Gu","doi":"10.1016/j.watres.2025.123189","DOIUrl":"https://doi.org/10.1016/j.watres.2025.123189","url":null,"abstract":"Per- and polyfluoroalkyl substances (PFAS) are a class of persistent organic compounds widely detected in the environments. Due to their chemical stability, physical adsorption has emerged as one of the most promising techniques for remediating PFAS-containing wastewater, while some newly synthesized functional absorbents in powder form suffer from separation issues. Inspired by mussel biology, we have successfully synthesized a porous spongy absorbent termed aminated polyurethane (PU-PDA-PANI) with over 99.5% removal efficiency for initial 10 mg L<sup>−1</sup> perfluorooctanoic acid (PFOA), corresponding to the maximum adsorption capacity of 1.42 g g<sup>−1</sup>, which was superior to the ion exchange resin (Purolite® PFA694E, 0.764 g g<sup>−1</sup>). In addition to PFOA, PU-PDA-PANI also showed excellent removal efficiencies for other typical PFAS (i.e. perfluorooctane sulfonates, perfluorobutyric acid, perfluorooctane-1,8-dioic acid, hexafluoropropylene oxide trimer acid, etc), and the adsorption processes resistant to pH changes and co-existing environmental matrixes. Furthermore, PU-PDA-PANI can be readily reused and regenerated by coupling extrusion and elution procedures. The adsorption mechanism of electrostatic, hydrogen bond and hydrophobic synergistic interaction was further proposed with the support of theoretical calculation. In conclusion, this study develops an efficient and recyclable PFAS adsorbent and proposes some new insights for the design of PFAS-selective adsorbents.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"27 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020236","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":"Metagenomic and enzymatic mechanisms underpinning efficient water treatment of 2-ethylhexyl diphenyl phosphate (EHDPP) by the microbial consortium 8-ZY","authors":"Yuanyuan Yu, Wantang Huang, Shaoyu Tang, Ying Xiang, Lizhu Yuan, Xifen Zhu, Hua Yin, Zhi Dang, Junfeng Niu","doi":"10.1016/j.watres.2025.123178","DOIUrl":"https://doi.org/10.1016/j.watres.2025.123178","url":null,"abstract":"The ubiquitous presence, potential toxicity, and persistence of 2-ethylhexyl diphenyl phosphate (EHDPP) in the environment have raised significant concerns. In this study, we successfully isolate a novel microbial consortium, named 8-ZY, and we demonstrate its remarkable ability to degrade EHDPP using an extremely low concentration of the inoculate. A total of 11 degradation metabolites were identified, including hydrolysis, hydroxylated, methylated, glucuronide-conjugated, and previously unreported byproducts, enabling us to propose new transformation pathways. Further, we unveiled the active members of the microbial consortium 8-ZY during the degradation of EHDPP. We observed the presence of diverse active populations, which included <em>Bradyrhizobium, Rhodopseudomonas, Sphingomonas, Hyphomicrobium, Chitinophaga, Aminobacter</em>, and <em>Ralstonia</em>. A metagenomic analysis revealed the presence of genes that encode phosphatase, phosphodiesterase, cytochrome P450, and hydroxylase enzymes, thus indicating their crucial role in EHDPP degradation. Furthermore, we successfully isolated <em>Burkholderia cepacia</em> ZY1, <em>Sphingopyxis terrae</em> ZY2, and <em>Amycolatopsis</em> ZY3 from the 8-ZY consortium, confirming their significance in EHDPP degradation and metabolite formation. These findings underscored the diversity of strains and functional genes responsible for the transformation of EHDPP within the consortium 8-ZY, highlighting the essential role of synergistic interactions during EHDPP biodegradation processes. Molecular docking and dynamics simulation suggested that alkaline phosphatase, cytochrome P450, and hydroxylase stably bonded to EHDPP within their respective active pockets, targeting distinct sites on the EHDPP molecule. These findings provide a comprehensive understanding of the transformation mechanisms of OPEs and contribute valuable insights into their fate in the environment.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"145 4 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992504","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}
Water ResearchPub Date : 2025-01-21DOI: 10.1016/j.watres.2024.123042
Sallamaari Siponen, Balamuralikrishna Jayaprakash, Anna-Maria Hokajärvi, Vicente Gomez-Alvarez, Jenni Inkinen, Ivan Ryzhikov, Pia Räsänen, Jenni Ikonen, Anna Pursiainen, Ari Kauppinen, Mikko Kolehmainen, Jussi Paananen, Eila Torvinen, Ilkka T. Miettinen, Tarja Pitkänen
{"title":"Corrigendum to “Composition of active bacterial communities and presence of opportunistic pathogens in disinfected and non-disinfected drinking water distribution systems in Finland” [Water Research, Volume 248 (2024) 120858]","authors":"Sallamaari Siponen, Balamuralikrishna Jayaprakash, Anna-Maria Hokajärvi, Vicente Gomez-Alvarez, Jenni Inkinen, Ivan Ryzhikov, Pia Räsänen, Jenni Ikonen, Anna Pursiainen, Ari Kauppinen, Mikko Kolehmainen, Jussi Paananen, Eila Torvinen, Ilkka T. Miettinen, Tarja Pitkänen","doi":"10.1016/j.watres.2024.123042","DOIUrl":"https://doi.org/10.1016/j.watres.2024.123042","url":null,"abstract":"The authors regret incorrect gene copy numbers of opportunistic pathogens in chapter 3.2 and an incorrect sample volume in chapter 3.3. The conclusions and figures in the article are correct. Also, authors noticed errors in the significance of <em>Pseudomonas</em> gene copy number results. The corrected text is below. The authors would like to apologise for any inconvenience caused.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"57 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142991011","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}
Water ResearchPub Date : 2025-01-21DOI: 10.1016/j.watres.2025.123170
Jialong Qin, Hengzhi Liu, Zhuoya Fang, Junjun Pei, Kai Yin, Kaixing Fu, Jinming Luo
{"title":"Selective Gold Extraction from E-waste Leachate via Sulfur-Redox Mechanisms Using Sulfhydryl-Functionalized MOFs","authors":"Jialong Qin, Hengzhi Liu, Zhuoya Fang, Junjun Pei, Kai Yin, Kaixing Fu, Jinming Luo","doi":"10.1016/j.watres.2025.123170","DOIUrl":"https://doi.org/10.1016/j.watres.2025.123170","url":null,"abstract":"Urban mining of precious metals from electronic waste (e-waste) offers a dual advantage by addressing solid waste management challenges and supplying high-value metals for diverse applications. However, traditional extraction methods generally suffer from poor selectivity and limited capacity in complex acidic leachate. Herein, we present a sulfhydryl-functionalized zirconium-based metal-organic framework (Zr-MSA-AA) as a recyclable and highly selective adsorbent for efficient gold recovery. Specifically, the Zr-MSA-AA exhibits high recovery capacity (1021 mg g<sup>-1</sup>), remarkable pH-universal, and superb selectivity (K<sub>d</sub> of 2.2 × 10<sup>7</sup> mL g<sup>-1</sup>) for gold ions across wide pH range and competitive conditions. Comprehensive mechanistic investigations highlight the pivotal role of sulfhydryl groups in selectively capturing gold ions. The redox-transformation of sulfhydryl and sulfonic acid groups mediated the reduction of Au(III) to Au(0) through the nucleation of chlorine-stabilized gold clusters. This unique mechanism, driven by the redox activity of designed sulfhydryl sites, not only mitigates interference from competing cations but also facilitates rapid adsorption kinetics (k<sub>f</sub> of 1.17 × 10<sup>-7</sup> m s<sup>-1</sup>) for gold ions, surpassing the performance of previous adsorbents. Consequently, Zr-MSA-AA demonstrates exceptional practical applicability, achieving high-purity gold recovery (23.8 Karat) from real e-waste leachate through straightforward physical separation methods. This study introduces an alternative practical strategy for utilizing sulfur's redox activity in adsorbent design, advancing the sustainable recycling of non-renewable metal resources while contributing to environmental conservation.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"15 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990778","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":"Vacuum UV-based processes for water and wastewater purification: From unitary to multicomponent systems","authors":"Chuang Wang, Xiaohui Wang, Jinying Du, Renjian Deng, Bozhi Ren, Saijun Zhou, Baolin Hou, Yaoyao huang, Zhiwei Zhao","doi":"10.1016/j.watres.2025.123175","DOIUrl":"https://doi.org/10.1016/j.watres.2025.123175","url":null,"abstract":"Vacuum ultraviolet (VUV) is profitable to strengthen the efficiencies of UV and reduce chemicals use, attracting more attention to water and wastewater purification. Herein, VUV-based water treatment processes from unitary VUV to multicomponent systems were reviewed for the first time to promote VUV applications. The rate of pollutant removal by unitary VUV was 1.3-57 times that of UV, in which hydroxyl radical oxidation was dominant. And the reducibility of hydrated electron and hydrogen atom radical in unitary VUV dehalogenated organics and reduced metal ions. Besides, VUV-based binary systems mainly included processes of VUV/H<sub>2</sub>O<sub>2</sub>, VUV/persulfate, VUV/ozone, VUV/chlorine, VUV/sulfite, VUV/iron ion, and VUV-based heterogeneous oxidation. VUV-based ternary systems basically contained three types: VUV-based Fenton-like, VUV coupling dual oxidants, and VUV combined with other technologies activating oxidants. Performance, characteristics, reactive species, and mechanisms of VUV-based binary and ternary systems were summarized. Moreover, the characterization, contribution, and role of reactive species in VUV-based processes were analyzed, and the combination of multiple methods was conducive to accurately identifying the mechanism of reactive species. Furthermore, the combination of VUV and other technologies expanded the application potential of VUV. Compared to UV-based processes, VUV-based processes significantly reduced energy consumption and were more promising in removing contaminants in actual waters. Finally, hot spots and directions (develop new techniques, reduce by-products, combine simulation and experiment, broaden removal objects, enhance pilot studies) of VUV-based water treatment technologies in future were prospected. Overall, VUV-based advanced oxidation processes are expected to be used in water treatment to improve process efficiency.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"62 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992500","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}
Water ResearchPub Date : 2025-01-21DOI: 10.1016/j.watres.2025.123173
Wanyi Fu, Ziyao Liu, Dan Li, Bingcai Pan
{"title":"Chemistry for Water Treatment under Nanoconfinement","authors":"Wanyi Fu, Ziyao Liu, Dan Li, Bingcai Pan","doi":"10.1016/j.watres.2025.123173","DOIUrl":"https://doi.org/10.1016/j.watres.2025.123173","url":null,"abstract":"The global freshwater crisis, exacerbated by escalating pollution, poses a significant threat to human health. Addressing this challenge required innovative strategies to develop highly efficient and process-adaptable materials for water decontamination. In this regard, nanomaterials with confinement structures have emerged as a promising solution, outperforming traditional nanomaterials in terms of efficiency, selectivity, stability, and process adaptability, thereby serving as an ideal platform for designing novel functional materials for sustainable water treatment. This Review focuses on recent advancements and employment of nanoconfinement effects in various water treatment processes, emphasizing the fundamental chemistry underlying nanoconfinement effects. Also, the existing knowledge gaps related to nanoconfinement effects and future prospects for expanding their applications in diverse water treatment scenarios are discussed.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"46 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142991008","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}
Water ResearchPub Date : 2025-01-21DOI: 10.1016/j.watres.2025.123169
Yuanyuan Fan, Shanshan Sun, Xushun Gu, Pan Yan, Yu Zhang, Yuanjun Peng, Shengbing He
{"title":"Tracing the electron transfer behavior driven by hydrophyte-derived carbon materials empowered autotrophic denitrification in iron-based constructed wetlands: Efficacy and enhancement mechanism","authors":"Yuanyuan Fan, Shanshan Sun, Xushun Gu, Pan Yan, Yu Zhang, Yuanjun Peng, Shengbing He","doi":"10.1016/j.watres.2025.123169","DOIUrl":"https://doi.org/10.1016/j.watres.2025.123169","url":null,"abstract":"Iron-based constructed wetlands (ICWs) displayed great potential in deep nitrogen elimination for low-polluted wastewater. However, the unsatisfactory denitrification performance caused by the limited solubility and sluggish activity of iron substrates needs to be improved in an eco-effective manner. To fill this gap, the bioavailability of iron substrates (iron scraps) affected by wetland biomass-derived carbon materials with potential conductivity were explored. Results indicated that the cumulative removal of TN in biochar-added ICW (BC-ICW) and activated carbon-added ICW (AC-ICW) increased by 29.04% and 22.96%, respectively. The carbon matrix of AC played the geo-conductor role to facilitate the rapid release of iron ions, as indicated by the higher TN removal efficiency of AC-ICW (45.36 ± 1.45%) at the early stage, while the reduced conductivity of AC negatively impacted the nitrogen removal. BC-ICW exhibited intensified denitrification potential, with higher TN removal capacity (52.08 ± 3.04%) and effluent Fe<sup>2+</sup> concentration. Electroactive bacteria (EB) (<em>Geobacter, Desulfovibrio, Shewanella</em>, etc.) associated with extracellular electron transfer were enriched in BC-ICW, as well as the expanded niches breadth and improved microbial community diversity. The electron-shuttling effect of BC was mainly attributed to its oxygenated functional groups (quinone/phenolic moieties), which supported the electron transfer from EB to extracellular iron oxides, as evidenced by the increased Fe(III)(hydro)oxides bioavailability. Besides, biochar concurrently up-regulated the gene expression of electron transport chains/mediators and denitrification reductases, suggesting that BC boosted the active iron cycle and iron-mediated autotrophic denitrification in ICWs by accelerating intracellular and extracellular electron transfer. This work explored the electron transfer behavior of biomass-derived carbon materials coupled with ICWs to enhance denitrification, providing insights into the sustainable application of biomass derived carbon-assisted ICWs in tertiary treatment.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"31 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990777","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}
Water ResearchPub Date : 2025-01-21DOI: 10.1016/j.watres.2025.123172
Do Hyuck Kwon, Min Jun Lee, Heewon Jeong, Sanghun Park, Kyung Hwa Cho
{"title":"Multi-modal learning-based algae phyla identification using image and particle modalities","authors":"Do Hyuck Kwon, Min Jun Lee, Heewon Jeong, Sanghun Park, Kyung Hwa Cho","doi":"10.1016/j.watres.2025.123172","DOIUrl":"https://doi.org/10.1016/j.watres.2025.123172","url":null,"abstract":"Algal blooms in freshwater, which are exacerbated by urbanization and climate change, pose significant challenges in the water treatment process. These blooms affect water quality and treatment efficiency. Effective identification of algal proliferation based on the dominant species is important to ensure safe drinking water and a clean water supply. Traditional algae identification techniques, such as microscopy and molecular techniques, are time-consuming and depend on the expertise of the practitioner. This study introduced an artificial intelligence (AI)-based multi-modal approach, which is a recent advancement in techniques for improving algal identification by integrating algal images and particle properties. We employed multi-modal learning to integrate multiple data modalities, including algal images and particle properties acquired using Flow Cam, to provide robustness and reliability for classifying algal phyla, such as <em>Anabaena, Aphanizomenon, Microcystis, Oscillatoria,</em> and <em>Synedra.</em> This study involved acquiring images and particle modalities, which were conducted to integrate the dataset using early, late, and hybrid fusion methods. In addition, explainable AI approaches, including SHapley Additive exPlanations (SHAP) and gradient-weighted class activation mapping (Grad-CAM), were used to investigate the contributions of the algal image and particle modalities to the proposed multi-modal algorithm. The multi-modal algae identifier with late fusion achieved an average F1 score of 0.91 and 0.88 for training and tests related to identifying algal phyla, respectively. Furthermore, compared with other modalities, the image and particle modalities showed significant potential as complementary and reliable components of deep-learning algorithms for algal identification in the water treatment process. These findings can contribute to a safe and clean water supply by effectively identifying the dominant algal species in the water treatment process.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"57 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992501","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}
Water ResearchPub Date : 2025-01-21DOI: 10.1016/j.watres.2025.123174
Wan Yang, Yunfei Liang, Taige Li, Wenjing Li, Xiaolin Liao, Bing Wang, Xiaozhi Wang, Shengsen Wang
{"title":"Interactions between iron mineral and low-molecular-weight organic acids accelerated nitrogen conversion and release in lake sediments","authors":"Wan Yang, Yunfei Liang, Taige Li, Wenjing Li, Xiaolin Liao, Bing Wang, Xiaozhi Wang, Shengsen Wang","doi":"10.1016/j.watres.2025.123174","DOIUrl":"https://doi.org/10.1016/j.watres.2025.123174","url":null,"abstract":"Endogenous nitrogen (N) release from lake sediments is one of main causes affecting water quality, which can be affected by the presence of iron (Fe) minerals and organic matter, especially low-molecular-weight organic acids (LMWOAs). Although these substances always coexist in sediments, their interaction effect on N fate is not yet clear. In this study, the role and mechanisms of the coexistence of iron mineral (ferrihydrite, Fh) and LMWOAs, i.e. citric acid (CA) and galacturonic acid (GA) on the release and transformation of N in lake sediments were systematically evaluated via microcosm cultivation for 45 d. Results showed that the addition of Fh+LMWOAs significantly accelerated N mineralization and conversion in lake sediments, accompanied by increasing ferrous iron content and decreasing redox potential. Biotic pathways played more critical roles than abiotic oxidation pathways during this process, and Fh+LMWOAs strengthened cooperation among microbial species by forming complex topologies and higher positive correlations. Correspondingly, cellular functions, iron respiration, and N metabolism modules were increased. CA with high carboxyl content showed greater total nitrogen removal and metabolic abundance. The present findings facilitate understanding the synergies of iron minerals and organic matter on N fate and N biogeochemical cycling in lake sediments.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"1 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992498","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}