Water Research最新文献_第5页

The impact of water-sediment regulation scheme (WSRS) on the chemistry of dissolved organic matter in the Yellow River estuary and adjacent waters

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research

Pub Date : 2025-04-17 DOI: 10.1016/j.watres.2025.123669

Donglei Niu , Yanfang Li , Yang Tan , Chao Ma , Yulin Qi , Yanan Li , Jianhui Tang

Dissolved organic matter (DOM) plays important roles in the global carbon cycle and aquatic ecosystem health. Estuaries are critical zones connecting land and ocean in which DOM experiences dispersion, transformation, degradation, deposition, etc. The Water-sediment regulation scheme (WSRS) was implemented in Yellow River (YR) and approximately half of annually sediment and a quarter of annually water were poured into estuary in around 20 days. Meanwhile, huge amounts of DOM were discharged into Yellow River estuary (YRE) rapidly, but their processes and fates in YRE and adjacent seas are unclear. This study aims to investigate the molecular and spectrum compositions of DOM and its associated transformation mechanisms around the YRE and its adjacent sea before (from June 8 to 12, 2022) and after (from July 18 to 22, 2022) the WSRS. A relatively greater amount of highly unsaturated compounds and terrestrial-derived DOM was found with higher aromaticity and humification degree after WSRS, by bulk geochemical techniques, optical spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) techniques. High levels of less photodegraded DOM were found in the estuarine region after WSRS, due to the rapidly pouring huge amount of fresh water and sediment into YRE. The high suspended sediment concentration facilitates the sorption of dissolved organic carbon (DOC), especially those sulphur-containing compounds in DOM which decreased both in the relative intensity and number. However, in the long term, WSRS may lead to an increase of DOC in the water column. Along with the YR plume and coastal current, DOM was transported from the YRE to Laizhou Bay to the south and arrived at Bohai Strait to the east. Overall, this research provides valuable insights into estuary DOM variations induced by the intensive dam-orientated regulation in a short term.

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引用次数: 0

Photodegradation mechanism of organic contaminants mediated by chlorinated algal organic matter

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research

Pub Date : 2025-04-17 DOI: 10.1016/j.watres.2025.123674

Dong Wan, Chengjie Yu, Yafei Zhao, Gaofei Song, Wujuan Mi, Yuxuan Zhu, Changzi Liu, Yonghong Bi

Algal organic matter (AOM) significantly influences the photochemical behavior of dissolved organic matter in aquatic environments. This study investigated the effects of chlorination on the photophysical and photochemical properties of AOM derived from Microcystis aeruginosa, compared these alterations with those observed for natural organic matter (NOM), and examined their impact on the photodegradation of organic contaminants, with a particular focus on N,N‑diethyl-m-toluamide (DEET) as a model substrate. The results demonstrated that chlorination substantially altered the photochemical reactivity of AOM. AOM and NOM exhibit distinct reactivities, reflecting their varied molecular compositions and functional groups. Specifically, chlorination reduced the aromaticity (SUVA₂₅₄ decreased by ∼42 %) and molecular weight (decreased by ∼30 %) of AOM, resulting in a shift of fluorescence peaks to lower wavelengths. It also enhanced the formation of singlet oxygen (¹O₂) and hydroxyl radical (^•OH). Chlorinated extracellular organic matter (EOM) exhibited a remarkable increase in ^•OH quantum yield, with a 200-fold enhancement at a high free available chlorine (FAC) dose (FAC/TOC ratio of 2.0). The photodegradation of DEET, involved H-abstraction and hydroxylation by ^•OH, was significantly accelerated in chlorinated EOM, highlighting the critical role of chlorinated AOM in driving photosensitized degradation processes. The findings emphasized the role of chlorination in altering AOM's photochemical properties, with significant implications for the enhanced transformation of contaminants in natural and engineered aquatic systems.

藻类有机物（AOM）会严重影响水生环境中溶解有机物的光化学行为。本研究调查了氯化对来自铜绿微囊藻的 AOM 的光物理和光化学特性的影响，将这些变化与天然有机物（NOM）中观察到的变化进行了比较，并考察了它们对有机污染物光降解的影响，尤其侧重于以 N,N-二乙基间甲苯胺（DEET）为模型底物。结果表明，氯化大大改变了 AOM 的光化学反应活性。AOM 和 NOM 具有不同的反应活性，反映了它们不同的分子组成和官能团。具体来说，氯化降低了 AOM 的芳香度（SUVA254 降低了 ∼ 42%）和分子量（降低了 ∼ 30%），导致荧光峰向低波长移动。它还增强了单线态氧（1O2）和羟自由基（-OH）的形成。氯化细胞外有机物（EOM）的 -OH 量子产率显著增加，在游离可得氯（FAC）剂量较高（FAC/TOC 比率为 2.0）的情况下增加了 200 倍。在氯化 EOM 中，DEET 的光降解（包括 H-萃取和 -OH 的羟基化）明显加快，这突出表明了氯化 AOM 在推动光敏降解过程中的关键作用。研究结果强调了氯化在改变 AOM 的光化学特性方面的作用，这对促进污染物在自然和工程水生系统中的转化具有重要意义。

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引用次数: 0

Viral diversity and auxiliary metabolic genes in rare earth element mine drainage in South China

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research

Pub Date : 2025-04-16 DOI: 10.1016/j.watres.2025.123666

Chang Hu , Jia-nan Lu , Ziwu Chen , Li Tian , Yalin Yin , Gengbo Jiang , Ying-heng Fei , Ye-Tao Tang , Shizhong Wang , Chao Jin , Rongliang Qiu , Yuanqing Chao

In extreme environments, viruses play a crucial role in regulating the structure and metabolic activities of microbial communities, thereby impacting the overall biogeochemical cycles. Previous research found that rare earth element acid mine drainage (REE-AMD) harbors a wide array of microbial species. However, our understanding of the viruses that infect these microorganisms remains limited. In this study, we utilized metagenomic analysis to explore the viral diversity, interactions between viruses and their hosts, as well as the viruses encoded auxiliary metabolic genes (AMGs) within REE-AMD. The results demonstrated that viral communities showed increased diversity with REEs pollution. Furthermore, AMGs exhibited habitat and host specificity. Viruses in water samples contaminated with REEs tended to encode AMGs related to cellular metabolic processes and stress responses to protect their hosts. In contrast, viruses in sediment samples were more likely to encode AMGs associated with nutrient competition, thereby expanding the ecological niches of hosts and viruses. Viruses would carry more AMGs from the dominant prokaryotes. Additionally, under REEs stress, viruses encode a greater number of carbon- and sulfur-related AMGs, influencing the carbon and sulfur cycles of microorganisms in REE-AMD. Overall, our study provides a first systematic characterization of the viral community in REE-AMD, which is crucial for understanding the intricate interactions among viruses, their hosts, and the surrounding environment.

在极端环境中，病毒在调节微生物群落的结构和代谢活动方面起着至关重要的作用，从而影响整个生物地球化学循环。以前的研究发现，稀土元素酸性矿井排水（REE-AMD）中蕴藏着大量微生物物种。然而，我们对感染这些微生物的病毒的了解仍然有限。在这项研究中，我们利用元基因组分析探索了 REE-AMD 中的病毒多样性、病毒与其宿主之间的相互作用以及病毒编码的辅助代谢基因（AMGs）。结果表明，病毒群落的多样性随着 REEs 污染的增加而增加。此外，AMGs 还具有栖息地和宿主特异性。受 REEs 污染的水样中的病毒倾向于编码与细胞代谢过程和应激反应有关的 AMGs，以保护其宿主。相比之下，沉积物样本中的病毒更有可能编码与营养竞争相关的AMGs，从而扩大宿主和病毒的生态位。病毒将携带更多来自优势原核生物的 AMGs。此外，在REEs胁迫下，病毒会编码更多与碳和硫有关的AMGs，从而影响REE-AMD中微生物的碳和硫循环。总之，我们的研究首次系统地描述了REE-AMD中的病毒群落，这对于了解病毒、宿主和周围环境之间错综复杂的相互作用至关重要。

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引用次数: 0

Genome-resolved metagenomic analysis reveals a novel denitrifier with truncated nitrite reduction pathway from the genus SC-I-84

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research

Pub Date : 2025-04-16 DOI: 10.1016/j.watres.2025.123598

Jiapeng Li , Xiaotian Zuo , Qianqian Chen , Yanting Lin , Fangang Meng

Understanding the genomic and ecological traits of partial denitrification (PD) bacteria is of high importance for developing wastewater treatment technologies. In this study, a PD-based bioreactor was operated, resulting in a mixed culture dominated by a potentially novel PD functional bacterium (SC-I-84). Progressively increased activity in both nitrate reduction and nitrite production were observed in the SC-I-84 enrichment system, whereas the nitrite reduction activity was always negligible. The phylogenetic analysis indicated that SC-I-84 was closely related to an uncultured beta-proteobacterium (99 %), whereas its denitrification functional genes (napA, napB, narV, and narY) exhibited evidence of co-evolution with chromosomal genes from the genus Cupriavidus, order Burkholderiales. In the genetic sketch of SC-I-84, only nitrate-reduction genes (nar and nap) were identified, whereas nitrite-reduction genes (nir) were absent. Notably, nitrate reduction genes were adjacent to carbon metabolism genes (sucB/C, mdh, idh) and a high abundance of tricarboxylic acid (TCA) cycling genes were found. This can promote the utilization efficiency of electron donors by nitrate reduction genes in SC-I-84, thus enhancing the denitrification activity. Furthermore, SC-I-84 positively cooperated with some bacteria that participate in nitrogen and carbon metabolism and other PD bacteria, but negatively interacted with full-denitrification bacteria. These results indicate that the enrichment of SC-I-84 restricted the growth of full-denitrification bacteria, aiding in the maintenance of a stable PD process. Taken together, the meta-genomic analysis of the novel PD functional bacterium is expected to enhance our understanding of PD processes and aid in the development of PD-based wastewater treatment processes.

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引用次数: 0

Identifying Spatially Targeted Organic Fertilizer Subsidies for Water Pollution Control: An Interactive Hydro-economic Model

IF 12.8 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research

Pub Date : 2025-04-16 DOI: 10.1016/j.watres.2025.123662

Shuping Wang, Pan Yang, Qian Tan, Linlin Yao, Cangbai Li

Developing a reasonable subsidy policy for organic fertilizer use can enhance manure recycling and mitigate non-point source (NPS) pollution. However, traditional policy analysis methods face challenges in capturing the interactions between real-world hydrological and economic processes, hindering accurate policy assessment and spatially targeted policy formulation. To address this gap, a hydro-economic model was proposed for policy analysis by coupling a microeconomic module based on positive mathematical programming with a semi-distributed eco-hydrological module (the SWAT model). This hydro-economic method overcomes the limitations of traditional models in capturing mutual feedback between hydrological and economic systems by using an iterative algorithm to reveal the interactions among water quantity, pollution loads, and agricultural practices. The pervasive scale mismatches between economic and eco-hydrological modules are also bridged by introducing a hydro-economic decision unit. Moreover, this approach advances previous models by formulating spatially targeted agri-environmental policies and identifying the spatiotemporal variations in NPS pollution under policy incentives. The hydro-economic model was applied to a typical agricultural watershed in northern China. The results indicated that increasing organic fertilizer subsidies from 0 to 1000 yuan/ton led to higher organic fertilizer use and farmer income, as well as spatiotemporal changes in NPS pollution and hydrological factors. The total phosphorus (TP) load, water yield, and surface runoff declined as subsidy levels increased, while the total nitrogen (TN) load fluctuated and evapotranspiration increased. The greatest reductions in TN loads occurred in spring (9510 kg), while TP loads were most reduced in summer (2680 kg). Priority areas for policy implementation were identified, where the same subsidies resulted in larger pollution reductions and greater benefits. Targeted subsidy levels have been suggested for each region to maximize the subsidy’s marginal utility in pollution mitigation. The proposed hydro-economic model could be widely applied to policy formulation and planning decisions in other resource management fields.

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引用次数: 0

Quantifying leachate discharge and assessing environmental risks of gully-type coal-based solid waste dumps in small watersheds: A refined hydrological modeling approach for mitigation strategies

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research

Pub Date : 2025-04-16 DOI: 10.1016/j.watres.2025.123655

Xiaofei Wang , Chaoli Zhao , Guowei Huang , Hu Liu , Xiaofang Zhu , Jiu Huang

Rainfall-induced leaching from extensive coal-based solid waste storage results in a long-term risk to watershed's water quality and safety. The leachate carries heavy metals and other contaminants, which migrate and accumulate through the watershed, leading to a persistent deterioration of downstream water environment. However, the lack of systematic research on the release, accumulation, and spatial-scale migration dynamics of leachate limits effective management of diffused leachate pollutions. This study presents a novel cross-scale coupling framework which integrates multi-source remote sensing data with Soil and Water Assessment Tool (SWAT) model, employing a strategy that transfers parameters from large basins to accurately quantify the hydrological processes in coal waste sub-basins. Additionally, a comprehensive analysis is performed on the hydrological characteristics, leachate generation, and watershed migration dynamics in gangue dump sub-watersheds, providing a new methodological framework for managing mining-related leachate pollution. The large basin model demonstrated strong performance (R² = 0.79, NSE = 0.66 for calibration; R² = 0.74, NSE = 0.59 for verification), while the sub-basin model exhibited excellent accuracy (R² = 0.94, NSE = 0.92 for calibration; R² = 0.81, NSE = 0.77 for verification). High-resolution drone data estimated the annual leachate production to be 3366.87 m³. Simulations revealed that leachate migration peaks in the summer months (July to September), significantly increasing downstream pollution risks. Risk assessments indicate that vegetation in land restoration areas reduces leachate production and migration via evapotranspiration and other processes. This study provides an adaptable methodological framework for managing mining-related leachate pollution and highlights the critical importance of optimal reclamation strategies for mitigating pollution and restoring degraded landscapes.

{"title":"Quantifying leachate discharge and assessing environmental risks of gully-type coal-based solid waste dumps in small watersheds: A refined hydrological modeling approach for mitigation strategies","authors":"Xiaofei Wang , Chaoli Zhao , Guowei Huang , Hu Liu , Xiaofang Zhu , Jiu Huang","doi":"10.1016/j.watres.2025.123655","DOIUrl":"10.1016/j.watres.2025.123655","url":null,"abstract":"<div><div>Rainfall-induced leaching from extensive coal-based solid waste storage results in a long-term risk to watershed's water quality and safety. The leachate carries heavy metals and other contaminants, which migrate and accumulate through the watershed, leading to a persistent deterioration of downstream water environment. However, the lack of systematic research on the release, accumulation, and spatial-scale migration dynamics of leachate limits effective management of diffused leachate pollutions. This study presents a novel cross-scale coupling framework which integrates multi-source remote sensing data with Soil and Water Assessment Tool (SWAT) model, employing a strategy that transfers parameters from large basins to accurately quantify the hydrological processes in coal waste sub-basins. Additionally, a comprehensive analysis is performed on the hydrological characteristics, leachate generation, and watershed migration dynamics in gangue dump sub-watersheds, providing a new methodological framework for managing mining-related leachate pollution. The large basin model demonstrated strong performance (R² = 0.79, NSE = 0.66 for calibration; R² = 0.74, NSE = 0.59 for verification), while the sub-basin model exhibited excellent accuracy (R² = 0.94, NSE = 0.92 for calibration; R² = 0.81, NSE = 0.77 for verification). High-resolution drone data estimated the annual leachate production to be 3366.87 m³. Simulations revealed that leachate migration peaks in the summer months (July to September), significantly increasing downstream pollution risks. Risk assessments indicate that vegetation in land restoration areas reduces leachate production and migration via evapotranspiration and other processes. This study provides an adaptable methodological framework for managing mining-related leachate pollution and highlights the critical importance of optimal reclamation strategies for mitigating pollution and restoring degraded landscapes.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"282 ","pages":"Article 123655"},"PeriodicalIF":11.4,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841588","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}

引用次数: 0

Microplastics inhibit lead binding to sediment components: Influence of surface functional groups and charge environment

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research

Pub Date : 2025-04-16 DOI: 10.1016/j.watres.2025.123661

Xiao Lu , Lijuan Wang , Jiawei Li , Wenqiu Li , Ruoqun Yan , Xiaoguang Duan , Yuanyuan Tang

The coexistence of heavy metals and microplastics in sediments is well recognized, yet the interactions within ternary systems remain underexplored, and comprehensive studies addressing the diverse sequences of sediment-microplastic-heavy metal coexistence are lacking. In this study, we systematically investigated the interactions among lead (Pb), polystyrene (PS) microplastics, and sediments (using goethite (Goe) and goethite-humic acid composite (GH) as examples) under different coexistence orders. The presence of PS significantly inhibited Pb adsorption by both Goe and GH. For Goe, adsorption kinetics and hydrochemical condition effects showed that PS reduced the electrostatic repulsion between Goe and Pb, leading to a fourfold increase in the mass transfer rate of Pb to the Goe surface. However, Pb 4f deconvolution indicated competition between PS and Pb for hydroxyl groups on Goe, resulting in a 7.4% reduction in Pb adsorption. In the GH system, hydrophobic interactions and coordination complexes between PS and humic acid on GH inhibited the electrostatic adsorption and mass transfer processes between Pb and GH. Pb adsorption behavior and changes in Pb-O content under different coexistence orders further verified that competition between PS and Pb for carboxyl and hydroxyl groups on GH led to a 28.0% reduction in Pb adsorption. This study highlights the inhibitory effect of PS on Pb adsorption by Goe and GH, providing a theoretical basis for understanding the migration and transformation patterns of microplastics and heavy metals in sediments.

{"title":"Microplastics inhibit lead binding to sediment components: Influence of surface functional groups and charge environment","authors":"Xiao Lu , Lijuan Wang , Jiawei Li , Wenqiu Li , Ruoqun Yan , Xiaoguang Duan , Yuanyuan Tang","doi":"10.1016/j.watres.2025.123661","DOIUrl":"10.1016/j.watres.2025.123661","url":null,"abstract":"<div><div>The coexistence of heavy metals and microplastics in sediments is well recognized, yet the interactions within ternary systems remain underexplored, and comprehensive studies addressing the diverse sequences of sediment-microplastic-heavy metal coexistence are lacking. In this study, we systematically investigated the interactions among lead (Pb), polystyrene (PS) microplastics, and sediments (using goethite (Goe) and goethite-humic acid composite (GH) as examples) under different coexistence orders. The presence of PS significantly inhibited Pb adsorption by both Goe and GH. For Goe, adsorption kinetics and hydrochemical condition effects showed that PS reduced the electrostatic repulsion between Goe and Pb, leading to a fourfold increase in the mass transfer rate of Pb to the Goe surface. However, Pb 4f deconvolution indicated competition between PS and Pb for hydroxyl groups on Goe, resulting in a 7.4% reduction in Pb adsorption. In the GH system, hydrophobic interactions and coordination complexes between PS and humic acid on GH inhibited the electrostatic adsorption and mass transfer processes between Pb and GH. Pb adsorption behavior and changes in Pb-O content under different coexistence orders further verified that competition between PS and Pb for carboxyl and hydroxyl groups on GH led to a 28.0% reduction in Pb adsorption. This study highlights the inhibitory effect of PS on Pb adsorption by Goe and GH, providing a theoretical basis for understanding the migration and transformation patterns of microplastics and heavy metals in sediments.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"281 ","pages":"Article 123661"},"PeriodicalIF":11.4,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841590","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}

引用次数: 0

Differential ion transport and biomass charges create strong electric fields in anammox granules

IF 12.8 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research

Pub Date : 2025-04-16 DOI: 10.1016/j.watres.2025.123663

Matteo Tucci, Federico Aulenta, Mie Mai Corneliussen, Luis F.M. Rosa, Cristian Picioreanu, Ugo Marzocchi

Quantifying mass transport of substrates and products within biofilms is crucial for the identification of limiting factors and thereby for the optimization of bioprocess. Current models assume that concentration gradients (i.e., molecular diffusion) control the transport of solutes within biofilms. Here, we document for the first time the presence of electric fields within anammox granules. The measured intensity of these electric potential fields was unprecedented (up to 360 V/m) compared to other biological systems. Mathematical modelling indicates that biomass behaves as a weak ion exchanger towards NH₄⁺, thereby inducing a diffusion potential. These electric fields, in turn, support the migration of ions, and the contribution of ionic migration to the total transport of NO₂^-, NH₄⁺ and NO₃^- matches the magnitude of molecular diffusion. Our data indicates that neglecting ionic migration could result in significant error in estimating mass transport and therefore limiting reactants and reaction rates within anammox granules and, potentially, in a broader range of natural and artificial biofilms.

{"title":"Differential ion transport and biomass charges create strong electric fields in anammox granules","authors":"Matteo Tucci, Federico Aulenta, Mie Mai Corneliussen, Luis F.M. Rosa, Cristian Picioreanu, Ugo Marzocchi","doi":"10.1016/j.watres.2025.123663","DOIUrl":"https://doi.org/10.1016/j.watres.2025.123663","url":null,"abstract":"Quantifying mass transport of substrates and products within biofilms is crucial for the identification of limiting factors and thereby for the optimization of bioprocess. Current models assume that concentration gradients (i.e., molecular diffusion) control the transport of solutes within biofilms. Here, we document for the first time the presence of electric fields within anammox granules. The measured intensity of these electric potential fields was unprecedented (up to 360 V/m) compared to other biological systems. Mathematical modelling indicates that biomass behaves as a weak ion exchanger towards NH<sub>4</sub><sup>+</sup>, thereby inducing a diffusion potential. These electric fields, in turn, support the migration of ions, and the contribution of ionic migration to the total transport of NO<sub>2</sub><sup>-</sup>, NH<sub>4</sub><sup>+</sup> and NO<sub>3</sub><sup>-</sup> matches the magnitude of molecular diffusion. Our data indicates that neglecting ionic migration could result in significant error in estimating mass transport and therefore limiting reactants and reaction rates within anammox granules and, potentially, in a broader range of natural and artificial biofilms.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"26 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841589","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}

引用次数: 0

Effects of artificial mixing on phytoplankton in a warmly stratified drinking water reservoir: Characterization, Mechanism, and Implication

IF 12.8 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research

Pub Date : 2025-04-15 DOI: 10.1016/j.watres.2025.123656

Yunhao Bai, Tinglin Huang

To improve water quality, water-lifting aerators (WLAs) are usually installed in reservoirs for artificial mixing. In this study, using taxonomic groups methods of phytoplankton, the characteristics and mechanisms of their response to artificial mixing were investigated during a two-year monitoring period in Xikeng Reservoir (XKR) in southern China, and compared the differences in response in the context of higher and lower phytoplankton abundance. The results showed that artificial mixing caused a significant decrease in phytoplankton abundance in the surface water column, but a short-term increase followed by a decrease in phytoplankton in the middle and bottom, and ultimately a homogenization of vertical phytoplankton with complete mixing of the water column. The phytoplankton showed a shift from Cyanobacteria to Bacillariophyta in artificial mixing process, while morphological characteristics of phytoplankton shifted from the larger Volume (V) to the smaller V at the same time. Besides, artificial mixing may be more likely to result in structural variation in lower phytoplankton abundance than in higher abundance. The mixing depth (Z_mix) and light availability (Z_eu/Z_mix; the euphotic depth (Z_eu)) were the key drivers of phytoplankton succession caused by artificial mixing in XKR, rather than water temperature (WT) and nutrients. This study also provided a successful example of effective control of phytoplankton overgrowth in a reservoir under higher WT and nutrient conditions, which had important implications for ecological managers and researchers in reservoirs or lakes.

{"title":"Effects of artificial mixing on phytoplankton in a warmly stratified drinking water reservoir: Characterization, Mechanism, and Implication","authors":"Yunhao Bai, Tinglin Huang","doi":"10.1016/j.watres.2025.123656","DOIUrl":"https://doi.org/10.1016/j.watres.2025.123656","url":null,"abstract":"To improve water quality, water-lifting aerators (WLAs) are usually installed in reservoirs for artificial mixing. In this study, using taxonomic groups methods of phytoplankton, the characteristics and mechanisms of their response to artificial mixing were investigated during a two-year monitoring period in Xikeng Reservoir (XKR) in southern China, and compared the differences in response in the context of higher and lower phytoplankton abundance. The results showed that artificial mixing caused a significant decrease in phytoplankton abundance in the surface water column, but a short-term increase followed by a decrease in phytoplankton in the middle and bottom, and ultimately a homogenization of vertical phytoplankton with complete mixing of the water column. The phytoplankton showed a shift from Cyanobacteria to Bacillariophyta in artificial mixing process, while morphological characteristics of phytoplankton shifted from the larger Volume (V) to the smaller V at the same time. Besides, artificial mixing may be more likely to result in structural variation in lower phytoplankton abundance than in higher abundance. The mixing depth (Z<sub>mix</sub>) and light availability (Z<sub>eu</sub>/Z<sub>mix</sub>; the euphotic depth (Z<sub>eu</sub>)) were the key drivers of phytoplankton succession caused by artificial mixing in XKR, rather than water temperature (WT) and nutrients. This study also provided a successful example of effective control of phytoplankton overgrowth in a reservoir under higher WT and nutrient conditions, which had important implications for ecological managers and researchers in reservoirs or lakes.","PeriodicalId":443,"journal":{"name":"Water Research","volume":"4 1","pages":""},"PeriodicalIF":12.8,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143837279","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}

引用次数: 0

Degradation and detoxification of neonicotinoid insecticides by a porous oxygen vacancy-rich BiOCl self-recovery system: Active site transfer enhances oxygen vacancies stability

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research

Pub Date : 2025-04-15 DOI: 10.1016/j.watres.2025.123651

Runren Jiang , Yuhao Ji , Min Wang , Yufang Chen , Xindi Wang , Guanghua Lu

The development of efficient photocatalytic methods for the degradation of neonicotinoid insecticide contamination and the reduction of its toxicity presents significant challenges. Although oxygen vacancies can enhance catalytic performance, they often destabilize the catalyst. In this study, we constructed a self-recovering porous BiOCl with oxygen vacancies (POv-BOCs), which forms an in-lattice electron donor-acceptor system under visible light. In this system, the donor lattice oxygen donates electrons to generate oxygen, while the acceptor lattice Bi accepts these electrons to produce metallic Bi⁰. The released oxygen is captured by Bi⁰, which replace the oxygen vacancies as active sites, thereby endowing POv-BOCs with enhanced stability. The electrophilic characteristics of POv-BOCs significantly improve the degradation performance of neonicotinoid insecticides, and the degradation rate exhibited a positive correlation with their electronic affinity value. Although some nitrated byproducts formed during the degradation process initially increased toxicity, the persistent action of POv-BOCs ultimately induced toxicity reduction. This work presents an effective approach to enhancing the stability and photocatalytic performance of oxygen vacancies, which are highly significant for developing of oxygen vacancy catalytic systems and the degradation of electron-deficient pollutants.

{"title":"Degradation and detoxification of neonicotinoid insecticides by a porous oxygen vacancy-rich BiOCl self-recovery system: Active site transfer enhances oxygen vacancies stability","authors":"Runren Jiang , Yuhao Ji , Min Wang , Yufang Chen , Xindi Wang , Guanghua Lu","doi":"10.1016/j.watres.2025.123651","DOIUrl":"10.1016/j.watres.2025.123651","url":null,"abstract":"<div><div>The development of efficient photocatalytic methods for the degradation of neonicotinoid insecticide contamination and the reduction of its toxicity presents significant challenges. Although oxygen vacancies can enhance catalytic performance, they often destabilize the catalyst. In this study, we constructed a self-recovering porous BiOCl with oxygen vacancies (POv-BOCs), which forms an in-lattice electron donor-acceptor system under visible light. In this system, the donor lattice oxygen donates electrons to generate oxygen, while the acceptor lattice Bi accepts these electrons to produce metallic Bi<sup>0</sup>. The released oxygen is captured by Bi<sup>0</sup>, which replace the oxygen vacancies as active sites, thereby endowing POv-BOCs with enhanced stability. The electrophilic characteristics of POv-BOCs significantly improve the degradation performance of neonicotinoid insecticides, and the degradation rate exhibited a positive correlation with their electronic affinity value. Although some nitrated byproducts formed during the degradation process initially increased toxicity, the persistent action of POv-BOCs ultimately induced toxicity reduction. This work presents an effective approach to enhancing the stability and photocatalytic performance of oxygen vacancies, which are highly significant for developing of oxygen vacancy catalytic systems and the degradation of electron-deficient pollutants.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"282 ","pages":"Article 123651"},"PeriodicalIF":11.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831586","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}

引用次数: 0