Water Research最新文献

{"title":"Transfer dynamics of intracellular and extracellular last-resort antibiotic resistome in hospital wastewater","authors":"Shengcen Zhang ,&nbsp;Jingrong Li ,&nbsp;Junzhong Lai ,&nbsp;Qianwen Zhang ,&nbsp;Zhichang Zhao ,&nbsp;Bin Li","doi":"10.1016/j.watres.2025.123833","DOIUrl":"10.1016/j.watres.2025.123833","url":null,"abstract":"<div><div>The increasing prevalence of last-resort antibiotic resistance genes (LARGs) has posed severe public health hazards. Previous studies focused primarily on the profiles of intracellular LARGs (iLARGs) in hospital wastewater (HWW), while largely neglecting the expression patterns of iLARGs and the presence of extracellular LARGs (eLARGs). Currently, wastewater resistomes and transfer dynamics of LARGs are still poorly characterized. This study integrates Nanopore-metagenomic and metatranscriptomic sequencing to conduct the comprehensive longitudinal analysis of both iLARGs and eLARGs in HWW. Our study firstly revealed the distinct seasonal patterns of iLARGs and eLARGs. Specifically, iLARGs showed higher abundance during colder seasons, whereas eLARGs showed higher abundance in warm seasons. Both clinical pathogens and functional bacteria of wastewater treatments were identified as important hosts of LARGs, while clinical pathogens played predominant roles in the high expression levels of LARGs. <em>Acinetobacter</em> spp. was identified as major host of <em>bla</em>_NDM-1 in HWW, which is unrestricted by plasmid host range compatibility. However, HWW treatments could not remove LARGs effectively and instead facilitated their transmission by enhancing the expression and horizontal transfer of mobile genetic element (MGE)-derived LARGs. Our study provides comprehensive insights for the atlas and transfer dynamics of LARGs in HWW for the development of control strategies under worldwide spread of antibiotic resistance.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"283 ","pages":"Article 123833"},"PeriodicalIF":11.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144067382","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":"Heterogeneous graph neural networks enhance pressure estimation in water distribution networks","authors":"Jian Wang ,&nbsp;Li Liu ,&nbsp;Dragan Savic ,&nbsp;Guangtao Fu","doi":"10.1016/j.watres.2025.123843","DOIUrl":"10.1016/j.watres.2025.123843","url":null,"abstract":"<div><div>Pressure estimation is crucial for efficient operation and management of water distribution networks (WDNs). However, it is often challenged by limited sensor observations. While graph neural networks (GNNs) have been used to improve hydraulic and water quality predictions of WDNs, their reliance on homogeneous graphs oversimplifies the diverse roles and interactions of hydraulic components, resulting in lower performance under dynamic system states. This research introduces a novel heterogeneous graph neural network (HGNN) framework, which models control units such as pumps and valves as distinct nodes while preserving their interactions through additional edge types. Experimental results using C-Town as a benchmark demonstrate that HGNN outperforms GNN in terms of accuracy, robustness, and adaptability, achieving a mean absolute percentage error (MAPE) of 1.88 % and a mean absolute error (MAE) of 1.70 m under a 95 % masking rate. Additionally, this study shows that optimal sensor placement reduces MAE by up to 15 %, and the proposed HGNN framework achieves high computational efficiency, highlighting its effectiveness in WDN analysis and management. This research offers an advanced and transferable approach for WDN pressure estimation, serving as a superior alternative to traditional pressure evaluation models.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"283 ","pages":"Article 123843"},"PeriodicalIF":11.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066659","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":"Occurrence, concentration and distribution of 50 organic contaminants in water and bottom sediment from urban streams affected by stormwater discharges","authors":"S.E. Kali,&nbsp;H. Österlund,&nbsp;M. Viklander,&nbsp;G. Blecken","doi":"10.1016/j.watres.2025.123847","DOIUrl":"10.1016/j.watres.2025.123847","url":null,"abstract":"<div><div>Stormwater runoff transports organic contaminants from urban areas to receiving water bodies, yet its contribution to these pollutants in the aquatic environment is still poorly understood. Additionally, contaminants behave differently in receiving waters, with some binding to particles and accumulating in sediments while others stay dissolved in the water. This study was carried out three Swedish urban streams receiving stormwater discharges through separate sewer systems, under dry and wet weather conditions. Stream water and bottom sediment samples were collected along an urbanization gradient, from rural upstream to urban downstream sections, and analyzed for 50 stormwater-related organic contaminants to assess the impact of stormwater on contaminant levels. Polycyclic aromatic hydrocarbons (PAHs) and phthalates were more prevalent in sediment samples, with concentrations increasing along the urbanization gradient, indicating contributions from urban areas and stormwater runoff. In contrast, organotin compounds and phenols showed no clear pattern indicating transport through stormwater runoff in the water phase. Per and polyfluoroalkyl substances (PFAS) behaved differently from other contaminant groups by exhibiting a clear contribution from stormwater runoff in both phases. Though carried out in streams passing through relatively small urban settings, the findings clearly demonstrate that stormwater discharges can impact receiving waters. Of the 50 analyzed contaminants, three exceeded toxicity-based limits in dry weather (DW), seven in wet weather (WW), and twenty in bottom sediments. In the water phase, under DW and WW conditions, the three contaminants with the highest exceedance of toxicity-based limits were Perfluorooctanesulfonic acid (PFOS), Tributyltin (TBT), and 4-nonylphenol (4-NP). In the sediment phase, 4‑tert-octylphenol (4-t-OP), Tributyltin (TBT), and di-2-ethylhexyl phthalate (DEHP) were the three compounds with the highest exceedance of toxicity-based limits. Compared to relatively hydrophilic contaminants (e.g., PFAS), hydrophobic organic contaminants, particularly those accumulating in sediments (e.g. phenols, phthalates), posed a greater risk to the aquatic environment with exceedance levels reaching up to 10⁵ times the thresholds. These findings raise concerns about the long-term impact on aquatic environments and highlight the need for mitigation strategies, including regulatory or operational restrictions on the contaminant sources and implementation of stormwater treatment facilities.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"283 ","pages":"Article 123847"},"PeriodicalIF":11.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066661","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":"The fate of cadmium during the hydrolysis and solid-state transformation of iron","authors":"Yining Gao ,&nbsp;Ning Liu ,&nbsp;Fangyuan Meng ,&nbsp;Leheng Dong ,&nbsp;Zhijun Fei ,&nbsp;Manjia Chen ,&nbsp;Chengshuai Liu ,&nbsp;Pan Wu ,&nbsp;Hui Tong","doi":"10.1016/j.watres.2025.123840","DOIUrl":"10.1016/j.watres.2025.123840","url":null,"abstract":"<div><div>The ubiquitous hydrolysis of Fe(III) ions in nature leads to the formation of ferrihydrite (Fh), which then undergoes solid-state transformation into crystalline mineral phases. However, the impact of this process on the geochemical fate of cadmium (Cd) in aquatic environments is not yet fully understood. This investigation systematically examined the partitioning mechanisms of Cd during the aforementioned processes through extraction techniques and multiple characterization methodologies. The experimental results demonstrated that Fe(III) ions first undergo the diffusion-limited aggregation (DLA) stage, forming loosely bound clusters with high Cd co-precipitation capacity. Upon transitioning to the reaction-limited aggregation (RLA) stage, Fe clusters exhibit increased structural complexity, wherein the expansion of radius of gyration predominantly governs Cd retention. As colloidal Fh develops, surface adsorption becomes the predominant mechanism for Cd sequestration. Throughout solid-state transformation in systems containing 1 mol% Cd, dehydroxylation processes induced acidification, facilitating the progressive liberation of Cd. Conversely, in systems with 10 mol% Cd, significant Cd incorporation induces distortion in the crystalline lattice structure, promoting system alkalinization and, consequently, enhancing Cd immobilization. pH gradient solid-state transformation experiments demonstrated that when initial pH values were below 8, final pH measurements were significantly lower than initial values, and vice versa. pH conditions potentially regulate the speciation of Fe within Fh, ultimately exerting substantial influence on Cd partitioning behavior. In summary, Fh formation beneficially stabilizes Cd, while its subsequent solid-state transformation triggers Cd redistribution.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"283 ","pages":"Article 123840"},"PeriodicalIF":11.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144067270","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":"Sub-sampling strategies for analysis of small (<20 µm) microplastics in water","authors":"Xingyu Feng,&nbsp;Vishal Manek,&nbsp;Robert C. Andrews,&nbsp;Husein Almuhtaram","doi":"10.1016/j.watres.2025.123846","DOIUrl":"10.1016/j.watres.2025.123846","url":null,"abstract":"<div><div>Quantification of microplastics (MPs) in drinking water is typically achieved using spectroscopic techniques. However, due to the time-consuming nature of these analyses researchers typically apply sub-sampling strategies whereby particles in small areas of a filter are quantified and subsequently extrapolated to the entire area. This widely applied strategy has not been evaluated in terms of potential extrapolation error despite a wide range of sub-sampling methods having been reported. The current study examined the relationship between sub-sampling and extrapolation accuracy when considering 2–100 µm low-density polyethylene (LDPE), polypropylene (PP), and polystyrene (PS) fragments, with a specific focus on particles &lt;20 µm in size as they are the most abundant and have the potential to exert adverse health impacts. A grid-based random sub-sampling method was developed to serve as a baseline such that extrapolation accuracy could be compared to several previously published methods. Results show that as sub-sampling area increases, error decreases following a power law trend. A minimum sub-sampling threshold was identified (approximately 6–8 % of total area) corresponding to an extrapolation error ranging from 8 to 17 %. Use of a log-normal model to describe particle size distributions was evaluated and found to be applicable to particles &gt;2–5 µm. Findings arising from this study provide insight regarding optimal sub-sampling strategies for the analysis of MP in drinking water.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"283 ","pages":"Article 123846"},"PeriodicalIF":11.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066710","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":"Microbial conversion of methane into single cell protein in a dual-membrane biofilm reactor","authors":"Yicheng Ma ,&nbsp;Tao Liu ,&nbsp;Zhiguo Yuan ,&nbsp;Jianhua Guo","doi":"10.1016/j.watres.2025.123838","DOIUrl":"10.1016/j.watres.2025.123838","url":null,"abstract":"<div><div>Single cell protein (SCP, or microbial protein) is a promising alternative food source that could sustainably address the growing demand for proteins. Recently, methane, as the main component of biogas, has been explored as a carbon and energy source for SCP production due to its lower cost and renewability compared to traditional substrates such as carbohydrates. However, a major challenge is how to safely deliver methane and oxygen, and the explosion risk impedes the CH₄-based SCP production. This study designed a dual-membrane biofilm reactor (dMBfR) for SCP production from methane, incorporating hollow fiber membranes to enhance the delivery of methane and oxygen. Over a 240-day operation, methane utilization efficiency reached 100 %, achieving the SCP yield of up to 0.49 g SCP/g CH₄. The reactor also exhibited competitive protein content of 50.2 % and biomass productivity of 506 mg/L/d. Additionally, we evaluated the reactor performance in response to varying aeration modes (open-end <em>versus</em> dead-end) and weekly protein harvest ratios (20 % <em>versus</em> 50 %). Compared to the dead-end aeration mode, the open-end mode led to 1.5-fold higher SCP production rates, 3.5-fold higher nitrogen-based SCP yields, 3.7-fold higher carbon-based SCP yields, and 1.1-fold higher protein content. Moreover, we applied the freeze-drying approach to produce dry SCP products in the reactor. The final SCP products exhibited higher solubility (17.4 %), water holding capacity (5.0 %), and emulsifying stability (93.3 %, after 24 h incubation) compared to typical fish meals, jointly indicative of the high quality of the produced SCP. This work offers valuable insights into CH₄-based SCP production, offering a promising avenue for efficient microbial protein synthesis.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"283 ","pages":"Article 123838"},"PeriodicalIF":11.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066709","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":"Short- and long-read metagenomics uncover the mobile extended spectrum β-lactamase (ESBL) and carbapenemase genes in hospital wastewater in Sri Lanka","authors":"Shashika Kumudumali Guruge ,&nbsp;Ziming Han ,&nbsp;S.H.P. Parakrama Karunaratne ,&nbsp;Rohana Chandrajith ,&nbsp;Titus Cooray ,&nbsp;Chengzhi Hu ,&nbsp;Yu Zhang ,&nbsp;Min Yang","doi":"10.1016/j.watres.2025.123831","DOIUrl":"10.1016/j.watres.2025.123831","url":null,"abstract":"<div><div>The antibiotic resistance issue in low- and middle-income countries has drawn global concern. This study presents the first metagenomic investigation of antibiotic resistance genes (ARGs) in hospital and municipal wastewater treatment plants (WWTPs) in Sri Lanka, using Illumina short-read and Nanopore long-read sequencing. Samples from three representative WWTPs receiving hospital and/or municipal wastewater (domestic generated) were collected from four districts in Sri Lanka, and as a comparison, wastewater directly discharged without treatment was also taken. ARG abundance was significantly higher in hospital wastewater (7.22 copies/cell) than in municipal wastewater (2.33 copies/cell), and greatly decreased by 82 % and 93 % after treatment processes, respectively. Similar trends were observed for mobile genetic elements. The prevalent subtypes of clinically relevant extended spectrum β-lactamase (ESBL) and carbapenemase genes in hospital wastewater were <em>bla</em>_OXA, <em>bla</em>_GES, <em>bla</em>_VEB and <em>bla</em>_TEM, whereas <em>bla</em>_CTX−_M and <em>bla</em>_NDM were less dominant, which indicated the potential unique distribution pattern of ESBL and carbapenemase genes in Sri Lanka. Using long-read metagenomics, bacterial host range and genetic locations (plasmid or chromosome) of ARGs in sludge samples were predicted. Diverse pathogenic host taxa (<em>Pseudomonas, Streptococcus, Salmonella</em> and <em>Escherichia</em>) and a higher plasmid proportion were identified in the hospital WWTP (39.8 % vs. 21.5 % in the municipal WWTP). Detected mobile genetic contexts in this study, IS<em>6100</em>-<em>sul1</em>-<em>bla</em>_OXA-329-<em>bla</em>_GES-5-<em>bla</em>_GES-5-<em>intI1</em> and IS<em>Kpn6</em>-<em>bla</em>_KPC-2-IS<em>Kpn7</em>-IS<em>Psy42</em>, were also common in antibiotic-resistant plasmids in <em>Enterobacteriaceae</em> from different countries. These data will serve to expand the inventory of global ARG epidemiology. Also, the finding emphasizes that the wastewater treatment projects, especially in healthcare facilities, are vital for reducing clinically relevant ARG discharge to the environment. Further monitoring using advanced meta-omics approaches is crucial to assess potential ARG risks and optimize control strategies for improving human and ecosystem health in Sri Lanka.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"283 ","pages":"Article 123831"},"PeriodicalIF":11.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066665","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":"Manipulating electrochemical phosphate recovery from acidic wastewater for synthesizing LiFePO4/C cathode material","authors":"Bingnan Song ,&nbsp;Wei Chen ,&nbsp;Ying Pu ,&nbsp;Weiquan Li ,&nbsp;Zhengshuo Zhan ,&nbsp;Haisheng Fang ,&nbsp;Yang Lei","doi":"10.1016/j.watres.2025.123839","DOIUrl":"10.1016/j.watres.2025.123839","url":null,"abstract":"<div><div>Phosphorus (P) recovery from wastewater offers a sustainable solution for mitigating pollution and securing resources for applications like lithium-ion batteries, where ferric phosphate is a valuable precursor. This study evaluates iron electrolysis for P removal and recovery from acidic wastewater with high phosphate concentrations and medium Ca²⁺ levels. The results suggested that effective P removal and high-purity iron phosphate production can be achieved by varying initial pH, current density, and oxidation conditions. Importantly, slow Fe release rates (0.02–0.04 mmol L⁻¹ min⁻¹) favored ferric phosphate formation (71%–77% removal), while faster rates (0.16–0.46 mmol L⁻¹ min⁻¹) predominantly produced vivianite (∼ 65% removal). In addition, air flush can enhance dissolved oxygen flux, achieving 89% P removal under rapid Fe release but with mixed products. H₂O₂ addition improved <em>in situ</em> Fe(II) oxidation, achieving 92% P removal and purer ferric phosphate. Compared to chemical precipitation, which required pH adjustment and suffered from Ca co-precipitation, iron electrolysis produced purer ferric phosphate directly, without pH pre-adjustment. The recovered ferric phosphate showed excellent potential as a precursor for high-performance LiFePO₄/C cathode material. These findings position iron electrolysis as a promising approach for sustainable P recovery and resource valorization from wastewater.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"283 ","pages":"Article 123839"},"PeriodicalIF":11.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066708","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":"Recovery of disintegrated halophilic aerobic granular sludge through ferric ion addition: Dual roles in filamentous fungal inhibition and microbial adhesion enhancement","authors":"Hui-Kai Liang,&nbsp;You-Wei Cui,&nbsp;Hui-Juan Yan,&nbsp;Zhen-Ying Li","doi":"10.1016/j.watres.2025.123844","DOIUrl":"10.1016/j.watres.2025.123844","url":null,"abstract":"<div><div>The disintegration of halophilic aerobic granular sludge (AGS) is often caused by filamentous fungal overgrowth, posing a significant challenge to wastewater treatment operations. However, methods to recover disintegrated halophilic AGS remain largely unexplored. This study proposes the restoration of disintegrated halophilic AGS through the addition of ferric ions (Fe³⁺). The effectiveness and mechanism of this approach are examined in terms of treatment performance, microbial population dynamics, and the properties of the activated sludge and granules. The results exhibited the dual roles of Fe³⁺ in inhibiting filamentous fungal overgrowth and enhancing microbial adhesion. As the dosage of Fe³⁺ rose from 0 to 10 mg/L, the bacterial population size grew from 5.23 × 10⁶ ± 2.01 × 10⁵ to 1.28 × 10⁷ ± 5.26 × 10⁵ copies/ng DNA, while the fungal population size decreased from 1.01 × 10⁶ ± 7.25 × 10⁴ to 5.37 × 10⁴ ± 2.09 × 10³ copies/ng DNA. The addition of Fe³⁺ significantly enhanced the dewaterability of the sludge (<em>p</em> &lt; 0.05), which in turn improved its settleability, with the sludge volume index after settling for 5 min (SVI₅) decreasing from 306.83 ± 6.65 to 50.73 ± 0.82 mL/g. Applying the extended Derjaguin-Landau-Verwey-Overbeek theory, the energy barrier between microorganisms before and after the addition of Fe³⁺(at 10 mg/L) decreased from 1787.67 to 474.93 KT, facilitating easier microbial aggregation. In addition, Fe³⁺ induced bacteria such as <em>Paracoccus, TM7x, TM7a, Hoeflea</em>, and <em>Lactococcus</em> to secrete more extracellular polymeric substances, enhancing cell hydrophobicity and reducing electrostatic repulsion. This study demonstrated that the addition of Fe³⁺ is a feasible strategy to restore the disintegrated halophilic AGS, due to its low cost and wide application in the operation of wastewater treatment plants.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"283 ","pages":"Article 123844"},"PeriodicalIF":11.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066579","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":"Regulating factors and spatiotemporal patterns of terrestrial dissolved organic carbon adsorption in a high-turbidity estuary","authors":"Zhi Chen ,&nbsp;Ricardo Torres ,&nbsp;Jialing Yao ,&nbsp;Ding He ,&nbsp;Daidu Fan ,&nbsp;Daniel Conley ,&nbsp;Andrew Manning ,&nbsp;Jianzhong Ge","doi":"10.1016/j.watres.2025.123837","DOIUrl":"10.1016/j.watres.2025.123837","url":null,"abstract":"<div><div>The adsorption of terrestrial dissolved organic carbon (tDOC) onto surfaces of suspended sediment plays a fundamental role in regulating carbon fluxes across the river-estuary-ocean continuum. It is an important process that modulates carbon transport, transformation, and long-term carbon storage, influencing regional and global carbon budgets. However, the role of suspended sediment is frequently neglected in related coastal and estuarine studies due to the complex interplay of physical and biogeochemical processes. To elucidate the relationship between suspended sediment and tDOC and quantify the adsorption process, this study developed a tDOC-adsorption-floc-population model that integrates floc behavior with tDOC adsorption processes. Taking the Changjiang Estuary as an example, the model quantified tDOC removal through adsorption and examined the key mechanisms governing this process. Results indicate that approximately 12.8 <span><math><mo>±</mo></math></span> 1 % of DOC is removed via adsorption when passing through the turbidity maximum zone (TMZ). The dominant mechanism of tDOC adsorption is governed by floc size, with Brownian motion and differential sedimentation alternating as the primary mechanism, whereas fluid shear exerts a relatively minor influence. The adsorption process is spatially aligned with the TMZ, but its influence, driven by the hydrodynamics, can extend into adjacent areas. These findings highlight the need for incorporating suspended sediment dynamics into regional and global carbon cycle models to enhance predictions of carbon transport and transformation in estuarine and coastal systems.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"283 ","pages":"Article 123837"},"PeriodicalIF":11.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144066706","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}