Water Research X最新文献

Making waves: Rethinking our mission for N2O emissions at WRRFs

IF 7.2 2区环境科学与生态学

Water Research X Pub Date : 2025-02-18 DOI: 10.1016/j.wroa.2025.100320

Leon Downing , McKenna Farmer , Bishav Bhattarai , Michael Penn , Joseph Kozak , Jonathan Grabowy , Fabrizio Sabba

{"title":"Making waves: Rethinking our mission for N2O emissions at WRRFs","authors":"Leon Downing , McKenna Farmer , Bishav Bhattarai , Michael Penn , Joseph Kozak , Jonathan Grabowy , Fabrizio Sabba","doi":"10.1016/j.wroa.2025.100320","DOIUrl":"10.1016/j.wroa.2025.100320","url":null,"abstract":"<div><div>Nitrous oxide (N<sub>2</sub>O) is a potent greenhouse gas with a global warming potential 273 times that of CO<sub>2</sub>, and it is a significant contributor to ozone depletion. Water resource recovery facilities (WRRFs) have been identified as a major source of N<sub>2</sub>O emissions, leading to significant research and policy efforts to mitigate these emissions. As WRRFs undertake these N<sub>2</sub>O mitigation efforts, important questions remain regarding the impact of more intensive nitrogen removal for pollution prevention and public health protection and how reactive nitrogen discharges are emitted as N<sub>2</sub>O in receiving waterways. To answer these questions, this perspective highlights the importance of balancing facility-scale emission factors to estimate N<sub>2</sub>O emissions from wastewater while considering the impacts of nitrogen if discharged to receiving water bodies. This perspective suggests more comprehensive approaches to manage N<sub>2</sub>O emissions, emphasizing the need to account for the reduction in N<sub>2</sub>O emissions achieved through nitrogen removal at WRRFs compared to direct discharge into receiving water bodies. By considering the overall impact of nitrogen from wastewater on N<sub>2</sub>O emissions from both WRRFs and receiving water bodies, WRRFs can reduce their impact on the environment while maintaining their important role in removing nitrogen from wastewater.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"28 ","pages":"Article 100320"},"PeriodicalIF":7.2,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Making waves: Generative artificial intelligence in water distribution networks: Opportunities and challenges

IF 7.2 2区环境科学与生态学

Water Research X Pub Date : 2025-02-13 DOI: 10.1016/j.wroa.2025.100316

Ridwan Taiwo , Abdul-Mugis Yussif , Tarek Zayed

{"title":"Making waves: Generative artificial intelligence in water distribution networks: Opportunities and challenges","authors":"Ridwan Taiwo , Abdul-Mugis Yussif , Tarek Zayed","doi":"10.1016/j.wroa.2025.100316","DOIUrl":"10.1016/j.wroa.2025.100316","url":null,"abstract":"<div><div>Water distribution networks (WDNs) face increasing challenges from aging infrastructure, population growth, and climate change, necessitating innovative technological solutions. This study examines the integration of Generative Artificial Intelligence (GenAI) in WDNs, including both conventional and reclaimed water systems. Through a comprehensive analysis of current literature and emerging applications, the study identifies key opportunities in near-future applications focusing on enhancing information retrieval through advanced document processing, improving water quality management via real-time monitoring and visualization, implementing predictive maintenance strategies through pattern recognition, and optimizing real-time operational control through adaptive algorithms. Results also demonstrate that GenAI can transform WDN operations through advanced visualization, scenario generation, and adaptive optimization capabilities, particularly in far-future applications such as demand forecasting, emergency response, and network design optimization. The analysis reveals significant challenges, including data quality and availability issues, particularly in non-English speaking regions, scalability constraints in large-scale networks, the critical need for water professionals with hybrid expertise in both traditional engineering and AI systems, and complex regulatory requirements that vary significantly across the globe. The study also explores unique applications in reclaimed WDNs, particularly in quality control, treatment optimization, and stakeholder engagement. These findings provide water utilities, policymakers, and researchers with valuable insights for implementing GenAI technologies while balancing technological advancement with human expertise and social responsibility.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"28 ","pages":"Article 100316"},"PeriodicalIF":7.2,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lake dissolved organic matters seasonal variations is a main driver of N2O emission: In molecular insights by using FT-ICR MS

IF 7.2 2区环境科学与生态学

Water Research X Pub Date : 2025-02-13 DOI: 10.1016/j.wroa.2025.100321

Zezheng Wang , Lu Li , Chengchao Liao , Min Deng , Yeerken Senbati , Yongxia Huang , Kang Song

{"title":"Lake dissolved organic matters seasonal variations is a main driver of N2O emission: In molecular insights by using FT-ICR MS","authors":"Zezheng Wang , Lu Li , Chengchao Liao , Min Deng , Yeerken Senbati , Yongxia Huang , Kang Song","doi":"10.1016/j.wroa.2025.100321","DOIUrl":"10.1016/j.wroa.2025.100321","url":null,"abstract":"<div><div>Anthropogenic activities have introduced substantial quantities of carbon and nitrogen into aquatic system, which are hotspots for nitrous oxide emissions and play multiple roles in the global biogeochemical cycle. We characterized the seasonal variation of DOM by employing a comprehensive approach incorporating absorption spectroscopy, excitation-emission matrix fluorescence and Fourier transform ion cyclotron resonance mass spectrometry (FT–ICR MS). Results revealed that DOM seasonal variation could be the main factor driven lake N<sub>2</sub>O emission alteration. In warm seasons, lakes are predominant with recalcitrant aromatic compounds DOM released by phytoplankton, such as highly unsaturated and phenolic compounds, polyphenols., and lignin, accompanied by low N<sub>2</sub>O concentrations (0.03±0.02 μmol/L). In cold seasons, bioavailable components (Aliphatic, Sugar-like, Peptide-like) are dominated in lakes, the increased abundance of S-containing compounds and low aromaticity compounds largely influenced by anthropogenic emissions, leads to elevated N<sub>2</sub>O concentrations (1.91±0.06 μmol/L). The DOM with high bioavailable components promotes sediment N<sub>2</sub>O production (<em>nir</em>/<em>nosZ (<sub>I+II)</sub>-</em>type denitrifiers) (<em>n</em> = 678). Recalcitrant DOM reduced sediment <em>nirK</em> and <em>nirS-</em>type denitrifiers, and increased <em>nosZ <sub>(I+II)</sub></em>-type denitrifiers, enhance the N<sub>2</sub>O reduction and led to a lower N<sub>2</sub>O emission. This study advances the understanding of the microbial mechanisms that DOM regulates N<sub>2</sub>O emissions in lakes.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"28 ","pages":"Article 100321"},"PeriodicalIF":7.2,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of acid-tolerant ammonia-oxidizing Nitrosospira bacteria suggests wide implementation of the acidic nitritation process

IF 7.2 2区环境科学与生态学

Water Research X Pub Date : 2025-02-10 DOI: 10.1016/j.wroa.2025.100317

Zhetai Hu , Xiaotong Cen , Zhiyao Wang , Min Zheng

{"title":"Characterization of acid-tolerant ammonia-oxidizing Nitrosospira bacteria suggests wide implementation of the acidic nitritation process","authors":"Zhetai Hu , Xiaotong Cen , Zhiyao Wang , Min Zheng","doi":"10.1016/j.wroa.2025.100317","DOIUrl":"10.1016/j.wroa.2025.100317","url":null,"abstract":"<div><div>Acidic activated sludge process has been recently developed for the suppression of nitrite-oxidizing bacteria, addressing the bottleneck in achieving robust partial nitritation (PN) for low-strength ammonia wastewater treatment. In the acidic process, three types of ammonia-oxidizing bacteria (AOB) have been detected, including acid-sensitive neutrophilic <em>Nitrosomonas</em>, acid-tolerant neutrophilic <em>Nitrosospira</em>, and acidophilic <em>Candidatus</em> (<em>Ca.</em>) <em>Nitrosoglobus</em>. Among them, <em>Nitrosospira</em> is much less studied. This study successfully enriched <em>Nitrosospira</em> in a membrane bioreactor at a pH of around 5.3. Stoichiometric and kinetic characterizations of the enriched <em>Nitrosospira</em> culture were determined, including yield, maximum growth and decay rates, affinity for oxygen and total ammonia, and susceptibility to common influencing factors such as pH, nitrite, free nitrous acid (FNA), salinity, and temperature. The results indicated that, compared to <em>Nitrosomonas, Nitrosospira</em> has a higher tolerance to acidity and FNA but a lower maximum growth rate. <em>Nitrosospira</em> has a competitive advantage over acidophilic AOB under neutral, oxygen-depleted, high-salinity or low-temperature conditions. These findings advance our understanding of utilising <em>Nitrosospira</em> for the acidic PN process, indicating a wider implementation of the process under these conditions.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"28 ","pages":"Article 100317"},"PeriodicalIF":7.2,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heterogeneous microstructure induces floatation in high-rate anammox granules

IF 7.2 2区环境科学与生态学

Water Research X Pub Date : 2025-02-10 DOI: 10.1016/j.wroa.2025.100319

Da Kang , Huifeng Lu , Tingting Kang , Yihan Zhang , Zheng Ge , Liang Zhang , Yongzhen Peng

{"title":"Heterogeneous microstructure induces floatation in high-rate anammox granules","authors":"Da Kang , Huifeng Lu , Tingting Kang , Yihan Zhang , Zheng Ge , Liang Zhang , Yongzhen Peng","doi":"10.1016/j.wroa.2025.100319","DOIUrl":"10.1016/j.wroa.2025.100319","url":null,"abstract":"<div><div>The floatation of anammox granules can be a serious challenge in practical wastewater treatment, as it can deteriorate reactor performance and cause bacterial loss. To deepen the understanding of floatation mechanism, in this study, both the floating (F-AnGS) and settling anammox granules (S-AnGS) from a high-rate anammox reactor were comparatively investigated. F-AnGS demonstrated 1.6 times higher specific anammox activity compared to S-AnGS, but only 65 % of produced gas could be successfully released, as quantified by anaerobic respirometry. In addition to the overall EPS accumulation, F-AnGS exhibited a heterogeneous microstructure distinct from that of S-AnGS, as revealed by 3D X-ray microscopic imaging at the single granule level. The heterogeneous distribution of EPS, which can form a dense surface layer, was the main cause for granule floatation. The heterogeneous microstructure of F-AnGS can reduce the distance between microorganisms and enhance the metabolic interaction between anammox bacteria and heterotrophs. The abundance of community members did not have a significant variation, but the functional genes related to anammox and partial denitrification pathway were significantly increased, indicating the enhanced nitrite loop in F-AnGS. This study proposed new structural insights into mechanism of anammox granule floatation, suggesting the appropriate activity control of granule-based anammox process.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"28 ","pages":"Article 100319"},"PeriodicalIF":7.2,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of comammox process on membrane-aerated biofilm reactor for autotrophic nitrogen removal comammox 过程对自养脱氮膜式通气生物膜反应器的影响

IF 7.2 2区环境科学与生态学

Water Research X Pub Date : 2025-02-10 DOI: 10.1016/j.wroa.2025.100318

Jiaying Hou , Ying Zhu , Fangang Meng , Bing-Jie Ni , Xueming Chen

{"title":"Impact of comammox process on membrane-aerated biofilm reactor for autotrophic nitrogen removal","authors":"Jiaying Hou , Ying Zhu , Fangang Meng , Bing-Jie Ni , Xueming Chen","doi":"10.1016/j.wroa.2025.100318","DOIUrl":"10.1016/j.wroa.2025.100318","url":null,"abstract":"<div><div>This study compared the simulation results of the side-stream membrane-aerated biofilm reactor (MABR) in terms of total nitrogen (TN) removal and N<sub>2</sub>O production obtained by the conventional comammox-exclusive biological nitrogen removal (BNR) model and the novel BNR model with comammox-related model structures/parameters. Even though the conventional comammox-exclusive MABR obtained >85 % TN removal over a wide range of substrate conditions and achieved up to ∼92.0 % TN removal, it suffered from 0.90 %-4.80 % N<sub>2</sub>O production. Comparatively, despite the significantly lower N<sub>2</sub>O production (0.01 %-0.06 %), due to the undesired full nitrification of comammox bacteria, the novel comammox-inclusive MABR failed to provide adequate nitrite for anammox bacteria under exceeding substrate conditions and only obtained the maximum ∼88.0 % TN removal through comammox bacteria-based partial nitritation/anammox. Both MABRs should be operated at a moderate hydraulic retention time (e.g., 4.0 d) with a sufficient biofilm thickness (e.g., ≥300 μm) to attain efficient TN removal and reduced N<sub>2</sub>O production.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"28 ","pages":"Article 100318"},"PeriodicalIF":7.2,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on the influence of g-C3N4 microstructure changes on the efficiency of visible light photocatalytic degradation

IF 7.2 2区环境科学与生态学

Water Research X Pub Date : 2025-02-08 DOI: 10.1016/j.wroa.2025.100315

Hong Tu, Bihong Tian, Zhichao Zhao, Renjiang Guo, Ya Wang, Shunhong Chen, Jian Wu

{"title":"Research on the influence of g-C3N4 microstructure changes on the efficiency of visible light photocatalytic degradation","authors":"Hong Tu, Bihong Tian, Zhichao Zhao, Renjiang Guo, Ya Wang, Shunhong Chen, Jian Wu","doi":"10.1016/j.wroa.2025.100315","DOIUrl":"10.1016/j.wroa.2025.100315","url":null,"abstract":"<div><div>The structural modulation of pristine graphitic carbon nitride poses a considerable challenge in the rational design of catalysts for the efficient degradation of small organic pollutants under visible light. In this study, we combined first-principles calculations and the structure-function relationship to predict a high-performance catalyst. The results reveal that CN-8 demonstrates a remarkable degree of electron-hole separation. Notably, CN-8 shows exceptional degradation efficiency towards rhodamine B, tetracycline, bisphenol A, and fluralaner under visible light irradiation. Specifically, the degradation rate constants are 11, 4, 12, and 32 times higher, respectively, compared to bulk g-C<sub>3</sub>N<sub>4</sub>. Through density functional theory calculations and investigations of the structure-function relationship, it is confirmed that the superior catalytic activity of CN-8 lies in modifying the amino position, which alters the electron cloud distribution and promotes the efficient separation of photo-generated electron-hole pairs. This study provides valuable insights for the development of eco-friendly and efficient photocatalysts for environmental remediation.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"28 ","pages":"Article 100315"},"PeriodicalIF":7.2,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microbial mechanisms underlying the reduction of N2O emissions from submerged plant covered system

IF 7.2 2区环境科学与生态学

Water Research X Pub Date : 2025-02-07 DOI: 10.1016/j.wroa.2025.100314

Yongxia Huang , Min Deng , Shuni Zhou , Yunpeng Xue , Senbati Yeerken , Yuren Wang , Lu Li , Kang Song

{"title":"Microbial mechanisms underlying the reduction of N2O emissions from submerged plant covered system","authors":"Yongxia Huang , Min Deng , Shuni Zhou , Yunpeng Xue , Senbati Yeerken , Yuren Wang , Lu Li , Kang Song","doi":"10.1016/j.wroa.2025.100314","DOIUrl":"10.1016/j.wroa.2025.100314","url":null,"abstract":"<div><div>Submerged plant (SP) restoration is a crucial strategy for restoring aquatic ecosystem. However, the effect of SP on nitrous oxide (N<sub>2</sub>O) emissions remains controversial, and the impact of SP-attached biofilms on N<sub>2</sub>O emissions is often overlooked. In this study, SP and non-submerged plant (NSP) systems were set up and operated continuously for 189 days, revealing that SP reduced N<sub>2</sub>O flux by 42.4 %. By comparing the N<sub>2</sub>O net emission rates from water, sediment, and biofilms, we identified biofilms as the primary medium responsible for the reduction in N<sub>2</sub>O emissions in both SP and NSP systems. Further analysis of N<sub>2</sub>O metabolic rates from nitrification, denitrification, and abiotic processes under light and dark conditions confirmed that counter-diffusion of dissolved oxygen and nutrients in SP biofilms plays a key role in reducing denitrification-driven N<sub>2</sub>O emissions. Additionally, SP-attached biofilms increased <em>nosZII</em>-type denitrifiers (e.g., <em>Bacillus</em>) and reduced N<sub>2</sub>O production potential ((<em>nirS</em>+<em>nirK</em>)/(<em>nosZI</em>+<em>nosZII</em>)). Notably, the establishment of a SP restoration project in a typical eutrophic freshwater lake demonstrated that SP could reduce N<sub>2</sub>O fluxes by 61.5 %. This study provides significant insights for strategies aimed at mitigating N<sub>2</sub>O emissions.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"28 ","pages":"Article 100314"},"PeriodicalIF":7.2,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dimensions of superiority: How deep reinforcement learning excels in urban drainage system real-time control

IF 7.2 2区环境科学与生态学

Water Research X Pub Date : 2025-02-05 DOI: 10.1016/j.wroa.2025.100313

Zhenyu Huang , Yiming Wang , Xin Dong

{"title":"Dimensions of superiority: How deep reinforcement learning excels in urban drainage system real-time control","authors":"Zhenyu Huang , Yiming Wang , Xin Dong","doi":"10.1016/j.wroa.2025.100313","DOIUrl":"10.1016/j.wroa.2025.100313","url":null,"abstract":"<div><div>Reducing combined sewer overflows and flooding is crucial for the efficient operation of urban drainage systems. Traditional real-time control (RTC) methods often fall short in efficiency and performance, which prompts the exploration of innovative approaches. Deep reinforcement learning (DRL) has recently emerged as a promising technique to enhance RTC performance. This study evaluates the effectiveness of RTC using a multi-agent-based DRL approach. We developed a comprehensive evaluation framework incorporating multiple quantitative indicators, including control objectives, decision time, robustness, and adaptability. To validate our framework, we conducted a case study on an urban drainage system in Suzhou, China, analyzing 31 historical rainfall events. Our findings reveal that DRL can reduce flooding and overflow risks by 15.1 % to 43.5 % on average compared to conventional RTC methods. Additionally, DRL demonstrates superior efficiency, robustness, and adaptability. This study not only highlights the potential of DRL in urban drainage management but also provides insights into its broader application in enhancing the resilience of urban infrastructure systems.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"28 ","pages":"Article 100313"},"PeriodicalIF":7.2,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual role of organic matter in Feammox-driven nitrogen and phosphate removal

IF 7.2 2区环境科学与生态学

Water Research X Pub Date : 2025-02-04 DOI: 10.1016/j.wroa.2025.100312

Yi Liu , Jiachen Dong , Xiaohui Cheng , Xiaotong Cen , Yan Dang , Kangning Xu , Min Zheng

{"title":"Dual role of organic matter in Feammox-driven nitrogen and phosphate removal","authors":"Yi Liu , Jiachen Dong , Xiaohui Cheng , Xiaotong Cen , Yan Dang , Kangning Xu , Min Zheng","doi":"10.1016/j.wroa.2025.100312","DOIUrl":"10.1016/j.wroa.2025.100312","url":null,"abstract":"<div><div>Feammox is a novel microbial process that enables simultaneous nitrogen and phosphorus removal in wastewater treatment. This study investigated the role of organic matter in Feammox-driven nutrient removal during long-term bioreactor operation by gradually increasing the influent chemical oxygen demand (COD) concentration from 0 to 50, and then to 100 mg/L. The results revealed that the ammonium removal efficiency was reduced from 60.5 % to 20.7 % with COD concentration increasing from 0 to 100 mg/L. In contrast, organic matter enhanced nitrate removal through heterotrophic denitrification, which outcompeted nitrate-dependent Fe(II) oxidation. Phosphorus removal was increased up to approximately 90 % via Fe(II)-mediated precipitation, forming vivianite crystals, evidenced by X-ray diffraction analysis. Continuous addition of Fe(III) alleviated the inhibitory effect of organic matter on ammonia oxidation by serving as an alternative electron acceptor, reducing competition. Therefore, optimizing organic matter levels and ensuring sufficient Fe(III) availability are crucial for achieving efficient nutrient removal in Feammox systems, particularly for treating wastewater with a low carbon/nitrogen ratio.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"27 ","pages":"Article 100312"},"PeriodicalIF":7.2,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143328163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0