Water Research X最新文献_第6页

Biodegradation of fluorinated octanoic acids in an O2-based membrane biofilm reactor 基于o2的膜生物膜反应器中氟辛酸的生物降解

IF 8.2 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research X

Pub Date : 2025-11-26 DOI: 10.1016/j.wroa.2025.100462

Tian-Yu Gao , Yi-Hao Luo , Min Long , Chen Zhou , Yu-Hang Cai , He-Ping Zhao , Bruce E. Rittmann

Per- and polyfluoroalkyl substances (PFAS) are persistent environmental contaminants due to their widespread use and recalcitrance to degradation. Aerobic bioreactors provide a possible path for further defluorination and mineralization of reductively defluorinated PFAS, which are generated by hydrogenative defluorination. This study colonized an O₂-based membrane biofilm reactor (O₂-based MBfR) with octanoic acid (OA) as the primary electron-donor substrate and evaluated the ability of its biomass to co-biodegrade PFOA and analogs with different degrees of hydrogen substitution – 2-FOA for 2-fluorooctanoic acid, 2H-PFOA for 2H,2H-perfluorooctanoic acid, and 4H-PFOA for 2H,2H,3H,3H-perfluorooctanoic acid. The O₂-based MBfR achieved complete removal (>95%) and defluorination (>95%) of 2-FOA and partial removal (∼48%) and defluorination (∼14%) of 2H-PFOA in continuous-flow operation. However, PFOA was not biodegraded at all. Batch experiments indicated that biofilms require the oxidation of a primary donor substrate for the biodegradation of 2H-PFOA, and perfluorohexanoic acid was a biodegradation product. Microbial-community analysis revealed that genera Cupriavidus and Pseudomonas were important during OA-enabled biodegradation of 2-FOA and 2H-PFOA, which involved b-oxidation reactions. In summary, sufficiently hydrodefluorinated PFOA could be completely mineralized through aerobic biological treatment, while minimally hydrodeflourinated PFOA could be biologically defluorinated, but at a much slower rate due to its insufficient electron and energy flows to sustain defluorination. These results underscore that perfluoroalkyl substances must be sufficiently hydrodefluorinated to enable rapid aerobic biodegradation.

全氟烷基和多氟烷基物质（PFAS）由于其广泛使用和难以降解而成为持久性环境污染物。好氧生物反应器为氢脱氟产生的还原性脱氟PFAS的进一步脱氟和矿化提供了可能的途径。本研究定植了以辛酸（OA）为主要电子供体底物的o2基膜生物膜反应器（O2-based MBfR），并评估了其生物质共生物降解PFOA和不同氢取代程度的类似物的能力——2-FOA可降解2-氟辛酸，2H- PFOA可降解2H，2H-全氟辛酸，4H-PFOA可降解2H，2H,3H，3H-全氟辛酸。在连续流操作中，o2基MBfR实现了2-FOA的完全去除（>95%）和脱氟（>95%），以及2H-PFOA的部分去除（~ 48%）和脱氟（~ 14%）。然而，PFOA完全没有生物降解。批量实验表明，生物膜需要氧化主要供体底物才能生物降解2H-PFOA，全氟己酸是生物降解产物。微生物群落分析表明，铜属和假单胞菌在oa激活2-FOA和2H-PFOA的生物降解过程中起重要作用，并参与b氧化反应。综上所述，充分氢化脱氟的全氟辛烷酸可以通过好氧生物处理完全矿化，而最低氢化脱氟的全氟辛烷酸可以进行生物脱氟，但由于其电子和能量流不足以维持脱氟，其速度要慢得多。这些结果强调，全氟烷基物质必须经过充分的氢除氟处理，才能实现快速的好氧生物降解。

{"title":"Biodegradation of fluorinated octanoic acids in an O2-based membrane biofilm reactor","authors":"Tian-Yu Gao , Yi-Hao Luo , Min Long , Chen Zhou , Yu-Hang Cai , He-Ping Zhao , Bruce E. Rittmann","doi":"10.1016/j.wroa.2025.100462","DOIUrl":"10.1016/j.wroa.2025.100462","url":null,"abstract":"<div><div>Per- and polyfluoroalkyl substances (PFAS) are persistent environmental contaminants due to their widespread use and recalcitrance to degradation. Aerobic bioreactors provide a possible path for further defluorination and mineralization of reductively defluorinated PFAS, which are generated by hydrogenative defluorination. This study colonized an O<sub>2</sub>-based membrane biofilm reactor (O<sub>2</sub>-based MBfR) with octanoic acid (OA) as the primary electron-donor substrate and evaluated the ability of its biomass to co-biodegrade PFOA and analogs with different degrees of hydrogen substitution – 2-FOA for 2-fluorooctanoic acid, 2H-PFOA for 2H,2H-perfluorooctanoic acid, and 4H-PFOA for 2H,2H,3H,3H-perfluorooctanoic acid. The O<sub>2</sub>-based MBfR achieved complete removal (>95%) and defluorination (>95%) of 2-FOA and partial removal (∼48%) and defluorination (∼14%) of 2H-PFOA in continuous-flow operation. However, PFOA was not biodegraded at all. Batch experiments indicated that biofilms require the oxidation of a primary donor substrate for the biodegradation of 2H-PFOA, and perfluorohexanoic acid was a biodegradation product. Microbial-community analysis revealed that genera <em>Cupriavidus</em> and <em>Pseudomonas</em> were important during OA-enabled biodegradation of 2-FOA and 2H-PFOA, which involved b-oxidation reactions. In summary, sufficiently hydrodefluorinated PFOA could be completely mineralized through aerobic biological treatment, while minimally hydrodeflourinated PFOA could be biologically defluorinated, but at a much slower rate due to its insufficient electron and energy flows to sustain defluorination. These results underscore that perfluoroalkyl substances must be sufficiently hydrodefluorinated to enable rapid aerobic biodegradation.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"30 ","pages":"Article 100462"},"PeriodicalIF":8.2,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Impact of cold-water premise plumbing on the fate and associated additive toxicity of disinfection byproducts 冷水前提管道对消毒副产物命运及相关添加剂毒性的影响

IF 8.2 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research X

Pub Date : 2025-11-25 DOI: 10.1016/j.wroa.2025.100459

Sheldon V. Masters , Timothy A. Bartrand , Kylie M. Boenisch-Oakes , Yun Yu , Marylia Duarte Batista , Audrey Young Keightley , Dienye L. Tolofari , Chad J. Seidel , R. Scott Summers

Disinfection byproducts (DBPs) can transform within building plumbing systems, altering both concentrations and toxicity at the point of use. This study evaluated how pipe material (copper, PEX, PVC), pipe diameter, and water use frequency affect the fate of four regulated trihalomethanes (THM4), nine haloacetic acids (HAA9) and four haloacetonitriles (HAN4) using controlled pipe racks operated for one year under chlorinated and chloraminated conditions. The calculated additive toxicity (CAT) metric for these DBP groups was also evaluated. Random Forest analysis revealed that water use frequency and disinfectant type were the strongest predictors of DBP occurrence and CAT with pipe material and size playing secondary roles. Under low-use conditions, HAN4 concentrations decreased by 60–90%, resulting in a 40–80% reduction in CAT relative to feed water, primarily due to the degradation of nitrogenous DBPs. In contrast, high-use conditions increased CAT by 25–50% across all pipe types. Complementary batch experiments, using copper and PEX pipes, expanded the DBP scope to 52 regulated and unregulated species and showed that, while HANs again declined, overall CAT did not decrease due to elevated levels of unregulated DBPs, particularly haloacetaldehydes which dominated CAT. These findings underscore the limits of relying on regulated DBPs or narrow toxicity metrics and suggest that whole-water assays offer a stronger framework for assessing health risk changes in plumbing systems. The apparent decline in DBP toxicity during stagnation coincided with much higher microbial activity (HPCs) across all pipe materials, emphasizing the challenge of balancing chemical and microbial risks in premise plumbing.

消毒副产物（DBPs）可以在建筑物管道系统内转化，改变使用点的浓度和毒性。本研究评估了管材（铜、PEX、PVC）、管径和用水频率如何影响四种管制三卤甲烷（THM4）、九种卤乙酸（HAA9）和四种卤乙腈（HAN4）在氯化和氯胺化条件下运行一年的受控管架的命运。对这些DBP组计算的加性毒性（CAT）指标也进行了评估。随机森林分析显示，用水频率和消毒剂类型是DBP发生和CAT的最强预测因子，管道材料和尺寸次之。在低使用条件下，HAN4浓度下降了60-90%，导致CAT相对于给水降低了40-80%，这主要是由于含氮dbp的降解。相比之下，在高使用条件下，所有管道类型的CAT都增加了25-50%。利用铜和PEX管进行的补充批量实验将DBP的范围扩大到52个受管制和不受管制的物种，结果表明，虽然汉斯再次下降，但总体CAT并未因不受管制DBP水平升高而下降，尤其是主导CAT的卤代乙醛。这些发现强调了依赖受调节dbp或狭义毒性指标的局限性，并表明全水分析为评估管道系统中的健康风险变化提供了更强有力的框架。停滞期间DBP毒性的明显下降与所有管道材料中微生物活性（HPCs）的增加相一致，这强调了在前提管道中平衡化学和微生物风险的挑战。

{"title":"Impact of cold-water premise plumbing on the fate and associated additive toxicity of disinfection byproducts","authors":"Sheldon V. Masters , Timothy A. Bartrand , Kylie M. Boenisch-Oakes , Yun Yu , Marylia Duarte Batista , Audrey Young Keightley , Dienye L. Tolofari , Chad J. Seidel , R. Scott Summers","doi":"10.1016/j.wroa.2025.100459","DOIUrl":"10.1016/j.wroa.2025.100459","url":null,"abstract":"<div><div>Disinfection byproducts (DBPs) can transform within building plumbing systems, altering both concentrations and toxicity at the point of use. This study evaluated how pipe material (copper, PEX, PVC), pipe diameter, and water use frequency affect the fate of four regulated trihalomethanes (THM4), nine haloacetic acids (HAA9) and four haloacetonitriles (HAN4) using controlled pipe racks operated for one year under chlorinated and chloraminated conditions. The calculated additive toxicity (CAT) metric for these DBP groups was also evaluated. Random Forest analysis revealed that water use frequency and disinfectant type were the strongest predictors of DBP occurrence and CAT with pipe material and size playing secondary roles. Under low-use conditions, HAN4 concentrations decreased by 60–90%, resulting in a 40–80% reduction in CAT relative to feed water, primarily due to the degradation of nitrogenous DBPs. In contrast, high-use conditions increased CAT by 25–50% across all pipe types. Complementary batch experiments, using copper and PEX pipes, expanded the DBP scope to 52 regulated and unregulated species and showed that, while HANs again declined, overall CAT did not decrease due to elevated levels of unregulated DBPs, particularly haloacetaldehydes which dominated CAT. These findings underscore the limits of relying on regulated DBPs or narrow toxicity metrics and suggest that whole-water assays offer a stronger framework for assessing health risk changes in plumbing systems. The apparent decline in DBP toxicity during stagnation coincided with much higher microbial activity (HPCs) across all pipe materials, emphasizing the challenge of balancing chemical and microbial risks in premise plumbing.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"30 ","pages":"Article 100459"},"PeriodicalIF":8.2,"publicationDate":"2025-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Investigation of the effectiveness of point-of-use (POU) water dispensers in reducing lead and nickel levels in drinking water 调查使用点（POU）饮水机在降低饮用水中铅和镍含量方面的有效性

IF 8.2 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research X

Pub Date : 2025-11-23 DOI: 10.1016/j.wroa.2025.100458

Saroj Adhikari , Yi-Pin Lin , Ding-Quan Ng

While trusted by consumers for safe drinking water, the effectiveness of point-of-use (POU) dispensers in reducing health-relevant heavy metals, such as lead (Pb) and nickel (Ni), and the potential of metal leaching from their internal components remain largely unexplored. This study conducts a detailed investigation of individual component within POU dispensers and their contribution to either the removal or release of Pb and Ni under controlled experimental conditions. Experiments were conducted using synthesized tap water as source water across three scenarios: clean water (no Pb or Ni), low spike (Pb: 10 μg/L, Ni: 20 μg/L), and high spike (Pb and Ni: 100 μg/L). Water samples collected from five downstream points, including post-filtration, storage, transfer, and outlet units, revealed detectable levels of Pb and Ni even under clean water conditions, indicating that component units could be potential sources. Pb levels were effectively reduced to below the local regulatory standard of 10 μg/L across most scenarios, except in hot water systems. Conversely, Ni concentrations frequently surpassed the local regulatory standard of 20 μg/L, particularly in hot water storage and outlet. Stainless steel components and solders were determined to be the sources of Ni and Pb respectively. Our findings recommend the need for a third-party monitoring of the POU dispensers and offer valuable insights to inform evidence-based improvements in material selection and testing, thereby ensuring the safety of drinking water.

虽然消费者相信使用点（POU）分配器可提供安全饮用水，但它在减少与健康有关的重金属（如铅（Pb）和镍（Ni））方面的有效性，以及从其内部成分中浸出金属的可能性，在很大程度上仍未得到探索。本研究在受控的实验条件下，对POU分配器内的单个成分及其对Pb和Ni的去除或释放的贡献进行了详细的调查。实验以合成自来水为源水，分洁净水（无Pb和Ni）、低峰水（Pb: 10 μg/L、Ni: 20 μg/L）和高峰水（Pb和Ni: 100 μg/L）三种情况进行。从五个下游点采集的水样，包括后过滤、储存、转运和出口单元，即使在清洁水条件下也显示出可检测到的铅和镍水平，表明组件单元可能是潜在的来源。除热水系统外，在大多数情况下，铅水平都有效地降低到10 μg/L以下。相反，镍浓度经常超过20 μg/L的当地监管标准，特别是在热水储存和出口。确定不锈钢成分和焊料分别为Ni和Pb的来源。我们的研究结果建议有必要对POU分配器进行第三方监测，并为材料选择和测试的循证改进提供有价值的见解，从而确保饮用水的安全。

{"title":"Investigation of the effectiveness of point-of-use (POU) water dispensers in reducing lead and nickel levels in drinking water","authors":"Saroj Adhikari , Yi-Pin Lin , Ding-Quan Ng","doi":"10.1016/j.wroa.2025.100458","DOIUrl":"10.1016/j.wroa.2025.100458","url":null,"abstract":"<div><div>While trusted by consumers for safe drinking water, the effectiveness of point-of-use (POU) dispensers in reducing health-relevant heavy metals, such as lead (Pb) and nickel (Ni), and the potential of metal leaching from their internal components remain largely unexplored. This study conducts a detailed investigation of individual component within POU dispensers and their contribution to either the removal or release of Pb and Ni under controlled experimental conditions. Experiments were conducted using synthesized tap water as source water across three scenarios: clean water (no Pb or Ni), low spike (Pb: 10 μg/L, Ni: 20 μg/L), and high spike (Pb and Ni: 100 μg/L). Water samples collected from five downstream points, including post-filtration, storage, transfer, and outlet units, revealed detectable levels of Pb and Ni even under clean water conditions, indicating that component units could be potential sources. Pb levels were effectively reduced to below the local regulatory standard of 10 μg/L across most scenarios, except in hot water systems. Conversely, Ni concentrations frequently surpassed the local regulatory standard of 20 μg/L, particularly in hot water storage and outlet. Stainless steel components and solders were determined to be the sources of Ni and Pb respectively. Our findings recommend the need for a third-party monitoring of the POU dispensers and offer valuable insights to inform evidence-based improvements in material selection and testing, thereby ensuring the safety of drinking water.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"30 ","pages":"Article 100458"},"PeriodicalIF":8.2,"publicationDate":"2025-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145624864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

How climate change erodes short-term lake-temperature predictability: Informing climate resilient lake forecasting 气候变化如何侵蚀短期湖泊温度可预测性：为气候适应性湖泊预测提供信息

IF 8.2 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research X

Pub Date : 2025-11-23 DOI: 10.1016/j.wroa.2025.100457

D. Atton Beckmann , M. Werther , T. Shatwell , E. Spyrakos , P. Hunter , I.D. Jones

Climate warming threatens short-term environmental forecast skill, yet its effect on water quality predictability is largely unquantified. Here, we demonstrate a new approach for assessing climate change effects on lake forecasts. Random forest (RF) and gated recurrent unit network models were trained on data from the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) Local Lakes Sector (five central-European lakes, four hydrodynamic models) and then used to forecast daily lake surface temperature 14 days ahead for 2060 - 2100 under four climate scenarios. We then varied (i) sensor-sampling interval (3, 7, 14 days) and (ii) training-set length (1 - 30 years). Under the strongest forcing (SSP585), the summer mean absolute error (MAE) of worst-affected lake, Esthwaite, rose by 0.14 °C (from 1.75 to 1.89 °C), driven by higher day-to-day temperature volatility (R² = 0.78). For this lake, extending the training set from 5 to 20 years or shortening sampling from 14 to 3 days reduced summer MAE by 0.11 and 0.17 °C, effectively offsetting the volatility caused by climate change. In winter, forecast error declined for four lakes because warmer, more stratified conditions simplified surface-layer dynamics. Thus, modest investments in monitoring cadence or historical record length can preserve forecast skill, even under extreme climate change. More broadly, this highlights a largely unexplored potential use for climate scenario projections: informing the design of climate resilient lake monitoring systems.

气候变暖威胁着短期环境预测技能，但其对水质可预测性的影响在很大程度上是无法量化的。在此，我们展示了一种评估气候变化对湖泊预报影响的新方法。随机森林（RF）和门控循环单元网络模型基于部门间影响模型比对项目（ISIMIP）本地湖泊部门（五个中欧湖泊，四个水动力模型）的数据进行训练，然后用于预测2060 - 2100年四种气候情景下未来14天的日湖表面温度。然后我们改变(i)传感器采样间隔（3,7,14天）和（ii）训练集长度（1 - 30年）。在最强强迫（SSP585）下，受影响最严重的Esthwaite湖夏季平均绝对误差（MAE）上升了0.14°C（从1.75°C上升到1.89°C），这是由更高的日温度波动率（R²= 0.78）驱动的。对于该湖泊，将训练集从5年延长至20年，或将采样时间从14天缩短至3天，可使夏季MAE分别降低0.11°C和0.17°C，有效抵消了气候变化带来的波动性。在冬季，四个湖泊的预报误差下降，因为更温暖、更分层的条件简化了表层动力学。因此，即使在极端气候变化的情况下，对监测节奏或历史记录长度的适度投资也能保持预测技能。更广泛地说，这突出了气候情景预测在很大程度上尚未开发的潜在用途：为气候适应性湖泊监测系统的设计提供信息。

{"title":"How climate change erodes short-term lake-temperature predictability: Informing climate resilient lake forecasting","authors":"D. Atton Beckmann , M. Werther , T. Shatwell , E. Spyrakos , P. Hunter , I.D. Jones","doi":"10.1016/j.wroa.2025.100457","DOIUrl":"10.1016/j.wroa.2025.100457","url":null,"abstract":"<div><div>Climate warming threatens short-term environmental forecast skill, yet its effect on water quality predictability is largely unquantified. Here, we demonstrate a new approach for assessing climate change effects on lake forecasts. Random forest (RF) and gated recurrent unit network models were trained on data from the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) Local Lakes Sector (five central-European lakes, four hydrodynamic models) and then used to forecast daily lake surface temperature 14 days ahead for 2060 - 2100 under four climate scenarios. We then varied (i) sensor-sampling interval (3, 7, 14 days) and (ii) training-set length (1 - 30 years). Under the strongest forcing (SSP585), the summer mean absolute error (MAE) of worst-affected lake, Esthwaite, rose by 0.14 °C (from 1.75 to 1.89 °C), driven by higher day-to-day temperature volatility (R² = 0.78). For this lake, extending the training set from 5 to 20 years or shortening sampling from 14 to 3 days reduced summer MAE by 0.11 and 0.17 °C, effectively offsetting the volatility caused by climate change. In winter, forecast error declined for four lakes because warmer, more stratified conditions simplified surface-layer dynamics. Thus, modest investments in monitoring cadence or historical record length can preserve forecast skill, even under extreme climate change. More broadly, this highlights a largely unexplored potential use for climate scenario projections: informing the design of climate resilient lake monitoring systems.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"30 ","pages":"Article 100457"},"PeriodicalIF":8.2,"publicationDate":"2025-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145624863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Enhanced degradation of sulfonamide antibiotics by soluble Mn(III) via polyphenol interactions: Key role of quinone intermediates rather than phenoxy radicals 可溶性锰（III）通过多酚相互作用增强磺胺类抗生素的降解：醌中间体而非苯氧自由基的关键作用

IF 8.2 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research X

Pub Date : 2025-11-20 DOI: 10.1016/j.wroa.2025.100452

Yuan Gao , Yang Zhou , Jingyu Hu , Zhen Wang , Qinyuan Lei , Jiaxuan Lv , Juntao Zhu , Jinxing Ma , Zhiwei Zhao

Soluble Mn(III) has been recognized as the prevalent relevant manganese species in natural waters. However, its potential role as an oxidant in the transformation of emerging contaminants has largely overlooked. In this study, we found that widespread naturally occurring polyphenols (e.g., catechol and its derivatives) interestingly and effectively enhanced Mn(III)-mediated oxidation of sulfonamides, contaminants of major concern to microbial ecology and public health. In contrast, neither soluble Mn(III) nor polyphenols alone exhibited appreciable reactivity toward sulfonamides. Mechanistic investigations revealed that Mn(III) initially oxidized catechol to phenoxy radicals. It was noteworthy that phenoxy radicals subjected to Mn(III) oxidation preferentially underwent conversion to ortho-benzoquinone (o-BQ) through phenoxenium ion formation rather than radical-radical coupling. In other words, catechol was stoichiometrically converted to o-BQ via two-electron transfer. o-BQ, rather than phenoxy radicals was identified as the key intermediate driving enhanced sulfonamides degradation, as supported by a series of experiments such as quenching tests, o-BQ formation and extensive products identification experiments. Specifically, o-BQ reacted with the anilinic nitrogen of sulfonamides via 1,4-nucleophilic addition rather than 1,2-nucleophilic addition, forming covalent adducts that significantly reduced both acute and chronic toxicity. In addition, electron-withdrawing substituents were found to enhance this transformation by increasing the electrophilicity of quinone intermediates and facilitating nucleophilic attack, which was demonstrated by QSARs and density functional theory calculations. Overall, these findings for the first time reveal a previously underappreciated pathway in which polyphenols mediate soluble Mn(III) reactivity, offering new mechanistic insights into Mn(III) redox chemistry and its implications for contaminant transformation in aquatic environments.

可溶性锰（III）是天然水体中普遍存在的相关锰种。然而，它作为氧化剂在新兴污染物转化中的潜在作用在很大程度上被忽视了。在这项研究中，我们发现广泛存在的天然多酚（例如儿茶酚及其衍生物）有趣且有效地增强了Mn（III）介导的磺胺类污染物的氧化，磺胺类污染物是微生物生态和公众健康的主要关注点。相比之下，可溶性锰（III）和多酚都没有单独对磺胺类化合物表现出明显的反应性。机制研究表明，Mn（III）最初将儿茶酚氧化为苯氧自由基。值得注意的是，受Mn（III）氧化的苯氧基自由基优先通过苯氧鎓离子形成而不是自由基-自由基偶联转化为邻苯醌（o-BQ）。换句话说，儿茶酚通过双电子转移在化学计量上转化为o-BQ。通过淬灭实验、o-BQ形成实验和大量的产物鉴定实验，我们发现o-BQ是促进磺胺类化合物降解的关键中间体，而不是苯氧基自由基。具体来说，o-BQ与磺胺类化合物的苯胺氮通过1,4亲核加成而不是1,2亲核加成反应，形成共价加合物，显著降低急性和慢性毒性。此外，吸电子取代基通过增加醌中间体的亲电性和促进亲核攻击来促进这种转变，这一点被qsar和密度泛函理论计算所证实。总的来说，这些发现首次揭示了多酚介导可溶性Mn（III）反应活性的途径，为Mn（III）氧化还原化学及其对水生环境中污染物转化的影响提供了新的机制见解。

{"title":"Enhanced degradation of sulfonamide antibiotics by soluble Mn(III) via polyphenol interactions: Key role of quinone intermediates rather than phenoxy radicals","authors":"Yuan Gao , Yang Zhou , Jingyu Hu , Zhen Wang , Qinyuan Lei , Jiaxuan Lv , Juntao Zhu , Jinxing Ma , Zhiwei Zhao","doi":"10.1016/j.wroa.2025.100452","DOIUrl":"10.1016/j.wroa.2025.100452","url":null,"abstract":"<div><div>Soluble Mn(III) has been recognized as the prevalent relevant manganese species in natural waters. However, its potential role as an oxidant in the transformation of emerging contaminants has largely overlooked. In this study, we found that widespread naturally occurring polyphenols (e.g., catechol and its derivatives) interestingly and effectively enhanced Mn(III)-mediated oxidation of sulfonamides, contaminants of major concern to microbial ecology and public health. In contrast, neither soluble Mn(III) nor polyphenols alone exhibited appreciable reactivity toward sulfonamides. Mechanistic investigations revealed that Mn(III) initially oxidized catechol to phenoxy radicals. It was noteworthy that phenoxy radicals subjected to Mn(III) oxidation preferentially underwent conversion to <em>ortho</em>-benzoquinone (<em>o</em>-BQ) through phenoxenium ion formation rather than radical-radical coupling. In other words, catechol was stoichiometrically converted to <em>o</em>-BQ via two-electron transfer. <em>o</em>-BQ, rather than phenoxy radicals was identified as the key intermediate driving enhanced sulfonamides degradation, as supported by a series of experiments such as quenching tests, <em>o</em>-BQ formation and extensive products identification experiments. Specifically, <em>o</em>-BQ reacted with the anilinic nitrogen of sulfonamides via 1,4-nucleophilic addition rather than 1,2-nucleophilic addition, forming covalent adducts that significantly reduced both acute and chronic toxicity. In addition, electron-withdrawing substituents were found to enhance this transformation by increasing the electrophilicity of quinone intermediates and facilitating nucleophilic attack, which was demonstrated by QSARs and density functional theory calculations. Overall, these findings for the first time reveal a previously underappreciated pathway in which polyphenols mediate soluble Mn(III) reactivity, offering new mechanistic insights into Mn(III) redox chemistry and its implications for contaminant transformation in aquatic environments.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"30 ","pages":"Article 100452"},"PeriodicalIF":8.2,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145624866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Ultraviolet light-emitting diode technologies in water disinfection 紫外发光二极管在水消毒中的应用

IF 8.2 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research X

Pub Date : 2025-11-17 DOI: 10.1016/j.wroa.2025.100454

Shaik Basha , Aradhika Vijeev , Pranavi KS , Ahana Chattopadhyay , Aparna Ramakrishna Pai , Krishna Kishore Mahato

Waterborne pathogens and chemical contaminants continue to pose a major global public health challenge, underscoring the need for effective and environmentally sustainable disinfection technologies. Conventional mercury-based ultraviolet (UV) systems, although widely applied, are associated with environmental and operational drawbacks. Ultraviolet light-emitting diodes (UV-LEDs) have recently been emerged as a promising alternative, offering tunable wavelengths, low energy consumption, operational flexibility, a cost-effective solution, and mercury-free design. This review critically examines recent advances in UV-LED-based water disinfection technologies, evaluating mechanisms of microbial inactivation, innovations in reactor design, and synergistic integration with advanced oxidation processes (AOPs). Special emphasis is given on wavelength-specific disinfection efficiency, hybrid treatment systems, and validation across diverse water matrices, including drinking water, wastewater, and industrial effluents. Challenges such as the formation of disinfection by-products (DBPs), turbidity effects, and techno-economic limitations are analyzed in detail. Furthermore, emerging directions, including smart UV-LED reactors, hybrid photonic systems, and decentralized water treatment units, are discussed in the context of global sustainability goals. Overall, UV-LED-based disinfection technologies demonstrate substantial potential to achieve high microbial inactivation while minimizing environmental impacts. Future opportunities lie in enhancing energy efficiency, integrating renewable energy sources, and developing multifunctional reactors to improve treatment efficacy against a broader spectrum of contaminants.

水媒病原体和化学污染物继续对全球公共卫生构成重大挑战，强调需要有效和环境可持续的消毒技术。传统的汞基紫外线（UV）系统虽然得到了广泛应用，但在环境和操作方面存在缺陷。紫外线发光二极管（uv - led）最近作为一种有前途的替代方案出现，它提供可调谐的波长、低能耗、操作灵活性、成本效益解决方案和无汞设计。本文综述了基于uv - led的水消毒技术的最新进展，评估了微生物灭活机制，反应器设计的创新，以及与高级氧化工艺（AOPs）的协同集成。特别强调波长特异性消毒效率，混合处理系统，并在不同的水基质，包括饮用水，废水和工业废水验证。详细分析了消毒副产物（DBPs）的形成、浊度效应和技术经济限制等挑战。此外，在全球可持续发展目标的背景下，讨论了新兴方向，包括智能UV-LED反应器，混合光子系统和分散式水处理单元。总体而言，基于uv - led的消毒技术显示出巨大的潜力，可以实现高微生物灭活，同时最大限度地减少对环境的影响。未来的机会在于提高能源效率，整合可再生能源，开发多功能反应器，以提高对更广泛污染物的处理效率。

{"title":"Ultraviolet light-emitting diode technologies in water disinfection","authors":"Shaik Basha , Aradhika Vijeev , Pranavi KS , Ahana Chattopadhyay , Aparna Ramakrishna Pai , Krishna Kishore Mahato","doi":"10.1016/j.wroa.2025.100454","DOIUrl":"10.1016/j.wroa.2025.100454","url":null,"abstract":"<div><div>Waterborne pathogens and chemical contaminants continue to pose a major global public health challenge, underscoring the need for effective and environmentally sustainable disinfection technologies. Conventional mercury-based ultraviolet (UV) systems, although widely applied, are associated with environmental and operational drawbacks. Ultraviolet light-emitting diodes (UV-LEDs) have recently been emerged as a promising alternative, offering tunable wavelengths, low energy consumption, operational flexibility, a cost-effective solution, and mercury-free design. This review critically examines recent advances in UV-LED-based water disinfection technologies, evaluating mechanisms of microbial inactivation, innovations in reactor design, and synergistic integration with advanced oxidation processes (AOPs). Special emphasis is given on wavelength-specific disinfection efficiency, hybrid treatment systems, and validation across diverse water matrices, including drinking water, wastewater, and industrial effluents. Challenges such as the formation of disinfection by-products (DBPs), turbidity effects, and techno-economic limitations are analyzed in detail. Furthermore, emerging directions, including smart UV-LED reactors, hybrid photonic systems, and decentralized water treatment units, are discussed in the context of global sustainability goals. Overall, UV-LED-based disinfection technologies demonstrate substantial potential to achieve high microbial inactivation while minimizing environmental impacts. Future opportunities lie in enhancing energy efficiency, integrating renewable energy sources, and developing multifunctional reactors to improve treatment efficacy against a broader spectrum of contaminants.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"29 ","pages":"Article 100454"},"PeriodicalIF":8.2,"publicationDate":"2025-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Making waves: Cold plasma at the frontline of pathogen and pollutant control 掀起波澜：冷等离子体在病原体和污染物控制的第一线

IF 8.2 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research X

Pub Date : 2025-11-17 DOI: 10.1016/j.wroa.2025.100453

João Pequeno , Joana Antunes , Davor Kržišnik , Tom Koritnik , Sebastian Dahle , José Gonçalves

Cold plasma (CP) is emerging as a powerful tool for water and wastewater treatment, capable of inactivating pathogens, mitigating antimicrobial resistance, and degrading persistent pollutants such as pharmaceuticals and personal care products (PPCPs), endocrine disruptors, and PFASs. Although often criticized for limited scalability, recent advances—including modular reactor designs, thin-film and microbubble systems, and integration with renewable energy—are steadily addressing these challenges. Rather than a fully developed solution, CP should be seen as a high-potential technology undergoing a critical transition toward field readiness. This Perspective argues that dismissing CP at this stage would be short-sighted. With targeted investment and interdisciplinary collaboration, CP could become a transformative option for safe water reuse and chemical pollution control in a world facing rising contamination and scarcity.

冷等离子体（CP）正在成为水和废水处理的强大工具，能够灭活病原体，减轻抗菌素耐药性，并降解持久性污染物，如药品和个人护理产品（PPCPs），内分泌干扰物和全氟辛烷化合物。尽管经常被批评可扩展性有限，但最近的进展——包括模块化反应堆设计、薄膜和微泡系统，以及与可再生能源的集成——正在稳步解决这些挑战。CP不是一种完全成熟的解决方案，而是一种正在向现场准备阶段进行关键过渡的高潜力技术。《透视》认为，在现阶段忽视CP是短视的。随着有针对性的投资和跨学科合作，CP可能成为在面临日益严重的污染和短缺的世界中安全回用水和化学污染控制的变革性选择。

引用次数: 0

Distinct biogeography of nitrite- and nitrate-dependent anaerobic methane oxidizing microorganisms in the yellow sea and yellow river 黄海和黄河中亚硝酸盐和硝酸盐依赖厌氧甲烷氧化微生物的独特生物地理特征

IF 8.2 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research X

Pub Date : 2025-11-16 DOI: 10.1016/j.wroa.2025.100450

Shuai Liu , Jiaxin Cheng , Hongyu Mu , Yining Jiang , Shaoping Kuang , Sai Xu , Hui Chen , Jianhua Guo

Nitrite/nitrate-dependent anaerobic methane oxidation (n-DAMO) processes represent a critical methane sink to mitigate greenhouse gas emissions. However, it remains unclear whether there are ecological and interactional differences between n-DAMO bacteria and n-DAMO archaea in freshwater and marine environments. This study investigated n-DAMO microorganisms in China’s Yellow River (freshwater) and Yellow Sea (marine). We used stable isotope tracers and molecular techniques to analyze their distribution and activity. Active n-DAMO processes were detected in sediments from both ecosystems. Specifically, the nitrite-DAMO process was more predominant for methane oxidation in the Yellow River, while the nitrate-DAMO process was more significant in the Yellow Sea, with nitrate availability (NO₃⁻-N) identified as a key influencing factor. The mcrA gene abundance of n-DAMO archaea was 19.9-fold higher in the Yellow Sea (average 2.94 × 10⁸ copies g⁻¹ dry weight) than in the Yellow River (p < 0.05). Conversely, the pmoA genes of n-DAMO bacteria in Yellow River sediments showed marginally lower abundance compared to Yellow Sea sediments. n-DAMO microbial communities in the two ecosystems demonstrated distinct divergence, with salinity identified as the principal environmental driver, explaining 28.03 % bacterial and 26.19 % archaeal variance (RDA, p < 0.05). Phylogenetic niche partitioning was observed: Group A lineage of n-DAMO bacteria exclusively dominated Yellow River sediments (100 % relative abundance), whereas Group B prevailed in Yellow Sea ecosystems, likely attributed to osmo-tolerance adaptations. These findings demonstrated biogeochemical conditions, especially salinity and substrate availability, determine the niche and functional differentiation of n-DAMO microbes.

依赖亚硝酸盐/硝酸盐的厌氧甲烷氧化（n-DAMO）过程是减少温室气体排放的关键甲烷汇。然而，淡水和海洋环境中n-DAMO细菌和n-DAMO古菌之间是否存在生态和相互作用差异尚不清楚。本研究对中国黄河（淡水）和黄海（海洋）中的n-DAMO微生物进行了研究。我们用稳定同位素示踪剂和分子技术分析了它们的分布和活性。在两个生态系统的沉积物中均检测到活性n-DAMO过程。其中，黄河以亚硝酸盐- damo过程为主，黄海以硝酸盐- damo过程为主，其中硝态氮（NO3−-N）是影响甲烷氧化的关键因素。黄海n-DAMO古菌的mcrA基因丰度（平均2.94 × 108拷贝g−1干重）是黄河的19.9倍（p < 0.05）。相反，黄河沉积物中n-DAMO细菌的pmoA基因丰度略低于黄海沉积物。两个生态系统的n-DAMO微生物群落表现出明显的差异，盐度被确定为主要的环境驱动因素，解释了28.03%的细菌和26.19%的古细菌差异（RDA, p < 0.05）。系统发育生态位分配观察到：A组n-DAMO细菌谱系在黄河沉积物中占绝对优势（相对丰度为100%），而B组在黄海生态系统中占主导地位，可能归因于渗透耐受性适应。这些发现表明，生物地球化学条件，特别是盐度和底物有效性，决定了n-DAMO微生物的生态位和功能分化。

{"title":"Distinct biogeography of nitrite- and nitrate-dependent anaerobic methane oxidizing microorganisms in the yellow sea and yellow river","authors":"Shuai Liu , Jiaxin Cheng , Hongyu Mu , Yining Jiang , Shaoping Kuang , Sai Xu , Hui Chen , Jianhua Guo","doi":"10.1016/j.wroa.2025.100450","DOIUrl":"10.1016/j.wroa.2025.100450","url":null,"abstract":"<div><div>Nitrite/nitrate-dependent anaerobic methane oxidation (n-DAMO) processes represent a critical methane sink to mitigate greenhouse gas emissions. However, it remains unclear whether there are ecological and interactional differences between n-DAMO bacteria and n-DAMO archaea in freshwater and marine environments. This study investigated n-DAMO microorganisms in China’s Yellow River (freshwater) and Yellow Sea (marine). We used stable isotope tracers and molecular techniques to analyze their distribution and activity. Active n-DAMO processes were detected in sediments from both ecosystems. Specifically, the nitrite-DAMO process was more predominant for methane oxidation in the Yellow River, while the nitrate-DAMO process was more significant in the Yellow Sea, with nitrate availability (NO<sub>3</sub><sup>−</sup>-N) identified as a key influencing factor. The <em>mcr</em>A gene abundance of n-DAMO archaea was 19.9-fold higher in the Yellow Sea (average 2.94 × 10<sup>8</sup> copies g<sup>−1</sup> dry weight) than in the Yellow River (<em>p</em> < 0.05). Conversely, the <em>pmo</em>A genes of n-DAMO bacteria in Yellow River sediments showed marginally lower abundance compared to Yellow Sea sediments. n-DAMO microbial communities in the two ecosystems demonstrated distinct divergence, with salinity identified as the principal environmental driver, explaining 28.03 % bacterial and 26.19 % archaeal variance (RDA, <em>p</em> < 0.05). Phylogenetic niche partitioning was observed: Group A lineage of n-DAMO bacteria exclusively dominated Yellow River sediments (100 % relative abundance), whereas Group B prevailed in Yellow Sea ecosystems, likely attributed to osmo-tolerance adaptations. These findings demonstrated biogeochemical conditions, especially salinity and substrate availability, determine the niche and functional differentiation of n-DAMO microbes.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"29 ","pages":"Article 100450"},"PeriodicalIF":8.2,"publicationDate":"2025-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Banana fibres as adsorbents for ammonium and phosphate in slaughterhouse wastewater 香蕉纤维作为屠宰场废水中铵和磷酸盐的吸附剂

IF 8.2 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research X

Pub Date : 2025-11-16 DOI: 10.1016/j.wroa.2025.100451

Valens Habimana , Paula Pou I Rodríguez , J. Chrisostome Ufitinema , Antoinette Ifeyinwa Okeke , Minna Hakkarainen , Antoine Nsabimana , Gunaratna Kuttuva Rajarao

Slaughterhouse wastewater (SWW), which is rich in organic matter, ammonium, and phosphate, contributes to water pollution if not properly treated. Here we investigated non modified banana fibre (NMOD BF), and sodium hydroxide-modified banana fibres (MOD BF), as low-cost adsorbents for ammonium and phosphate in synthetic slaughterhouse wastewater (SSWW). Batch and continuous adsorption experiments assessed their performance, while scanning electron microscopy (SEM), scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDX), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA) characterized the fibres. The SEM-EDX confirmed surface modification and FTIR showed structural changes due to hemicellulose and lignin removal, enhancing cellulose exposure. In both batch and continuous systems, ammonium removal reached more than 90% in MOD BF and NMOD BF. An efficient removal of ammonium was achieved in 2 h and fibre concentration of 1 g/l. Phosphate removal reached up to 50% in MOD BF and NMOD BF. The NMOD BF excelled slightly in phosphate removal. These findings suggest that banana fibres can be a viable solution for removal of ammonium and phosphate in slaughterhouse wastewater treatment (SWWT), with additional optimization warranted for real-world applications.

屠宰场废水（SWW）富含有机物、铵和磷酸盐，如果处理不当，会造成水污染。本文研究了未改性香蕉纤维（NMOD BF）和氢氧化钠改性香蕉纤维（MOD BF）作为合成屠宰场废水（SSWW）中铵和磷酸盐的低成本吸附剂。间歇和连续吸附实验评估了它们的性能，扫描电子显微镜（SEM）、扫描电子显微镜-能量色散x射线能谱（SEM - edx）、傅里叶变换红外光谱（FTIR）和热重分析（TGA）对纤维进行了表征。SEM-EDX证实的表面修饰和FTIR表明，由于半纤维素和木质素的去除，结构发生了变化，增强了纤维素的暴露。在间歇式和连续式系统中，modbf和NMOD BF的氨氮去除率均达到90%以上。在2 h内实现了铵的有效去除，纤维浓度为1 g/l。在MOD和NMOD高炉中，磷酸盐去除率达到50%以上。NMOD高炉除磷效果稍好。这些发现表明，香蕉纤维可以作为一种可行的解决方案，用于去除屠宰场废水处理（SWWT）中的铵和磷酸盐，并对实际应用进行额外的优化。

{"title":"Banana fibres as adsorbents for ammonium and phosphate in slaughterhouse wastewater","authors":"Valens Habimana , Paula Pou I Rodríguez , J. Chrisostome Ufitinema , Antoinette Ifeyinwa Okeke , Minna Hakkarainen , Antoine Nsabimana , Gunaratna Kuttuva Rajarao","doi":"10.1016/j.wroa.2025.100451","DOIUrl":"10.1016/j.wroa.2025.100451","url":null,"abstract":"<div><div>Slaughterhouse wastewater (SWW), which is rich in organic matter, ammonium, and phosphate, contributes to water pollution if not properly treated. Here we investigated non modified banana fibre (NMOD BF), and sodium hydroxide-modified banana fibres (MOD BF), as low-cost adsorbents for ammonium and phosphate in synthetic slaughterhouse wastewater (SSWW). Batch and continuous adsorption experiments assessed their performance, while scanning electron microscopy (SEM), scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDX), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA) characterized the fibres. The SEM-EDX confirmed surface modification and FTIR showed structural changes due to hemicellulose and lignin removal, enhancing cellulose exposure. In both batch and continuous systems, ammonium removal reached more than 90% in MOD BF and NMOD BF. An efficient removal of ammonium was achieved in 2 h and fibre concentration of 1 g/l. Phosphate removal reached up to 50% in MOD BF and NMOD BF. The NMOD BF excelled slightly in phosphate removal. These findings suggest that banana fibres can be a viable solution for removal of ammonium and phosphate in slaughterhouse wastewater treatment (SWWT), with additional optimization warranted for real-world applications.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"29 ","pages":"Article 100451"},"PeriodicalIF":8.2,"publicationDate":"2025-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145571045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

The important role of controlling water velocity and benthic fish in lake eutrophication restoration 控制流速和底栖鱼类在湖泊富营养化恢复中的重要作用

IF 8.2 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research X

Pub Date : 2025-11-11 DOI: 10.1016/j.wroa.2025.100449

Weijie Li , Yu Lin , Xiaoxu Wu , Songbo Wang , Junshuang Yu , Yutai Dai , Jiping Chen , Sai Ding , Qiang Gao , Bingbing Liang , Ling Li , Hong Shen , Chi Zhou , Xuan Chen , Xuwei Deng

Eutrophication has emerged as a significant environmental challenge confronting freshwater lakes globally, largely driven by increased human activities. This study utilizes a combination of in situ simulations and field validation experiments to systematically evaluate the disturbance effects induced by water velocity and benthic fish on lake water quality and aquatic vegetation. We explore the potential of managing water velocity and benthic fish as effective ecological technologies to mitigate endogenous pollution, enhance lake water quality, and promote the growth of submerged plants. Our findings demonstrate that the disturbance of two factors lead to a substantial increase in suspended particulate matter (SPM) ranging between 2 and 10 μm, which is the primary cause of diminished water transparency and the yellowing of water color. Notably, there is a critical velocity threshold under the conditions of this study: between 0.6 × 10 ⁻³ m/s to 1.2 × 10 ⁻³ m/s, algal growth is inhibited, whereas sediment resuspension occurs at flow velocities ranging from 1.2 × 10 ⁻³ m/s to 1.8 × 10 ⁻³ m/s. Our results indicate that reducing flow rates and controlling benthic fish populations can significantly lower fine particle concentrations, decrease nutrient levels, and mitigate algal biomass and odor release, thereby fostering the growth of submerged aquatic vegetation (e.g. Vallisneria natans). These findings offer valuable insights for the ecological management of similar lakes and provide essential guidance for the restoration and protection of comparable ecosystems.

富营养化已成为全球淡水湖面临的重大环境挑战，主要是由人类活动增加造成的。本研究采用原位模拟和现场验证实验相结合的方法，系统评价了流速和底栖鱼类对湖泊水质和水生植被的干扰效应。我们探索了控制流速和底栖鱼类作为有效生态技术的潜力，以减轻内源污染，改善湖泊水质，促进水下植物的生长。结果表明，两种因素的干扰导致水体中悬浮颗粒物（SPM）在2 ~ 10 μm范围内大量增加，这是导致水体透明度降低和水色变黄的主要原因。值得注意的是，在本研究条件下存在一个临界流速阈值：在0.6 × 10−3 m/s到1.2 × 10−3 m/s之间，藻类生长受到抑制，而在1.2 × 10−3 m/s到1.8 × 10−3 m/s的流速范围内，沉积物发生再悬浮。我们的研究结果表明，降低流速和控制底栖鱼类种群数量可以显著降低细颗粒物浓度，降低营养水平，减少藻类生物量和气味释放，从而促进水下水生植被（如水蛭）的生长。这些发现为类似湖泊的生态管理提供了有价值的见解，并为类似生态系统的恢复和保护提供了重要的指导。

{"title":"The important role of controlling water velocity and benthic fish in lake eutrophication restoration","authors":"Weijie Li , Yu Lin , Xiaoxu Wu , Songbo Wang , Junshuang Yu , Yutai Dai , Jiping Chen , Sai Ding , Qiang Gao , Bingbing Liang , Ling Li , Hong Shen , Chi Zhou , Xuan Chen , Xuwei Deng","doi":"10.1016/j.wroa.2025.100449","DOIUrl":"10.1016/j.wroa.2025.100449","url":null,"abstract":"<div><div>Eutrophication has emerged as a significant environmental challenge confronting freshwater lakes globally, largely driven by increased human activities. This study utilizes a combination of in situ simulations and field validation experiments to systematically evaluate the disturbance effects induced by water velocity and benthic fish on lake water quality and aquatic vegetation. We explore the potential of managing water velocity and benthic fish as effective ecological technologies to mitigate endogenous pollution, enhance lake water quality, and promote the growth of submerged plants. Our findings demonstrate that the disturbance of two factors lead to a substantial increase in suspended particulate matter (SPM) ranging between 2 and 10 μm, which is the primary cause of diminished water transparency and the yellowing of water color. Notably, there is a critical velocity threshold under the conditions of this study: between 0.6 × 10 <sup>−3</sup> m/s to 1.2 × 10 <sup>−3</sup> m/s, algal growth is inhibited, whereas sediment resuspension occurs at flow velocities ranging from 1.2 × 10 <sup>−3</sup> m/s to 1.8 × 10 <sup>−3</sup> m/s. Our results indicate that reducing flow rates and controlling benthic fish populations can significantly lower fine particle concentrations, decrease nutrient levels, and mitigate algal biomass and odor release, thereby fostering the growth of submerged aquatic vegetation (e.g. <em>Vallisneria natans</em>). These findings offer valuable insights for the ecological management of similar lakes and provide essential guidance for the restoration and protection of comparable ecosystems.</div></div>","PeriodicalId":52198,"journal":{"name":"Water Research X","volume":"29 ","pages":"Article 100449"},"PeriodicalIF":8.2,"publicationDate":"2025-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145519266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0