Water Research最新文献_第6页

Stoichiometric analysis and control strategy of partial nitrification for treating dewatering liquid from food-waste methane fermentation

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

Water Research

Pub Date : 2025-02-09 DOI: 10.1016/j.watres.2025.123255

Shen Cui , Shenghao Ji , Wenzhao Zhao , Liguo Wan , Yu-You Li

Methane fermentation is critical for food-waste management; however, effective treatment of its high-ammonium dewatering liquid remains a major challenge. Anammox, a promising candidate for liquid treatment, requires effective pretreatment, such as partial nitrification (PN), to reduce ammonium and generate sufficient nitrite to optimize efficiency. In this study, an airlift reactor was employed to process the dewatering liquid from food-waste methane fermentation. Stable operation for over 360 days demonstrated its feasibility under high-load conditions. By implementing precise aeration control strategy to stabilize the ammonium removal efficiency (ARE = 50.2–57.1 %), a detailed summary of the optimal operational parameter ranges (consumed inorganic carbon [ΔIC] 1000–1160 mg C/L, effluent [Eff.] IC 282–378 mg C/L, pH 8.05–8.17, Eff. Alkalinity 1000–1350 mg CaCO₃/L, free ammonia 61.9–82.5 mg/L, and free nitrous acid 47.6–71.1 μg/L) were provided under the ideal NO₂⁻/NH₄⁺ ratio of 1.1–1.3. Additionally, variations in ammonium oxidizing bacteria activity with temperature and pH were analyzed by the Arrhenius, cardinal temperature model with inflection, and Haldane models, with R² values of 0.998, 0.975, and 0.999, respectively. Results suggest that the optimal conditions for partial nitrification were identified as a temperature range of 20–40 °C and a pH range of 7.5–8.5. Microbial sequencing reveals Nitrosomonas markedly enriched during operation, with its abundance rising from 3.67 % to 9.76 % as the NLR increased. Notably, NOB was nearly undetectable throughout the entire process. Additionally, an advanced aeration-based control mechanism with a positive feedback loop were proposed, which allows the airlift PN reactor to effectively treat high-ammonia dewatering liquid, thereby providing a suitable influent for subsequent anammox and offering crucial theoretical insights for future controlling pilot-scale system operation.

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引用次数: 0

Microplastic pollution in Pearl River networks: Characteristic, potential sources, and migration pathways

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

Water Research

Pub Date : 2025-02-09 DOI: 10.1016/j.watres.2025.123261

Huan Wang , Tingting Zhu , Jun Wang , Yi Liu

Microplastic (MP) pollution has become a global environmental problem with profound impacts on aquatic ecosystems. Although the topic of MPs has attracted high attention, the sources, transport pathway, and removal of MPs in river networks is still unclear. Here, we conducted a field survey across the Pearl River Basin (PRB) (> 4.5 × 10⁵ km²) and collected the water samples to characterize the spatial distribution of MPs using a Laser Direct Infrared (LDIR) chemical imaging system. The MPs were detected in all samples with an average abundance of 1092.86 items/L, in which polyamide (PA), polyurethane (PU), and polyvinyl chloride (PVC) are the main polymer types. Population and surface runoff were identified as major factors influencing the concentrations of MPs. The Partial Least Squares Structural Equation Modeling (PLS-PM) analysis revealed that precipitation-induced surface runoff is a major pathway for MPs transferring from terrestrial environment to river networks. River hydraulic dynamics were found to have considerable influence on the selective removal of MPs from water column in the river channel. The smooth state (Froude number, Fr <0.23) promotes while the rough state (Fr > 0.23) inhibits the deposition of MPs from water column to sediments. In particular, the smooth state facilitates the deposition of large-sized and high-density MPs from the water column to sediments. The deposition processes in river channel cause considerable fractionation of polymer types and size of riverine MPs. This study provides the first-hand MP pollution status in the networks of the PRB and provide insights into sources, spatial distribution characteristics, and transmission mechanism of MPs in river networks, which would provide theoretical bases and experimental reference for river water quality management and risk control of MPs for governor, stakeholders, and policy makers.

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引用次数: 0

Dynamics of nitrogen-transforming microbial populations in wastewater treatment during recirculation of hydrothermal liquefaction process-water

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

Water Research

Pub Date : 2025-02-08 DOI: 10.1016/j.watres.2025.123254

Patrick Skov Schacksen , Williane Vieira Macêdo , Sandeep Rellegadla , Leendert Vergeynst , Jeppe Lund Nielsen

The global reliance on non-renewable fossil fuels highlights the urgent need for sustainable alternative energy sources. Hydrothermal liquefaction (HTL) offers a promising solution by converting biomass, such as sewage sludge, into biocrude oil. However, the integration of excess HTL-process water (HTL-PW), a by-product of this process, into conventional wastewater treatment requires careful evaluation. This study investigates the effects of recirculating HTL-PW in sequencing batch reactors (SBRs) using synthetic wastewater. Two SBRs were operated in parallel: one fed 0.15 % (v/v) HTL-PW and the other with only synthetic feed. The reactor receiving HTL-PW demonstrated superior stability, effective nitrification, and consistent denitrification with no adverse effects on nitrogen species turnover. A comprehensive approach combining 16S rRNA gene amplicon sequencing for relative abundance and metagenomic analysis, for enhanced resolution of nitrogen-transforming populations, revealed the genetic repertoire and potential of 58±4 % and 65±4 % of the genus-level annotations from the HTL-PW and control reactors, respectively. The HTL-PW-fed reactor maintained robust performance, with microbial community analysis revealing a strong association between nitrogen transformations and specific microbial taxa, thereby explaining the observed reactor stability and efficiency in nitrogen conversion. These findings demonstrate the feasibility of integrating HTL-PW into wastewater treatment systems, showing that recirculating HTL-PW at the tested concentrations does not adversely affect nitrogen transformations, supports stable nitrification and denitrification, ensures complete ammonium utilisation, and promotes diverse and dynamic microbial communities similar to those in full-scale wastewater treatment plants.

{"title":"Dynamics of nitrogen-transforming microbial populations in wastewater treatment during recirculation of hydrothermal liquefaction process-water","authors":"Patrick Skov Schacksen , Williane Vieira Macêdo , Sandeep Rellegadla , Leendert Vergeynst , Jeppe Lund Nielsen","doi":"10.1016/j.watres.2025.123254","DOIUrl":"10.1016/j.watres.2025.123254","url":null,"abstract":"<div><div>The global reliance on non-renewable fossil fuels highlights the urgent need for sustainable alternative energy sources. Hydrothermal liquefaction (HTL) offers a promising solution by converting biomass, such as sewage sludge, into biocrude oil. However, the integration of excess HTL-process water (HTL-PW), a by-product of this process, into conventional wastewater treatment requires careful evaluation. This study investigates the effects of recirculating HTL-PW in sequencing batch reactors (SBRs) using synthetic wastewater. Two SBRs were operated in parallel: one fed 0.15 % (v/v) HTL-PW and the other with only synthetic feed. The reactor receiving HTL-PW demonstrated superior stability, effective nitrification, and consistent denitrification with no adverse effects on nitrogen species turnover. A comprehensive approach combining 16S rRNA gene amplicon sequencing for relative abundance and metagenomic analysis, for enhanced resolution of nitrogen-transforming populations, revealed the genetic repertoire and potential of 58±4 % and 65±4 % of the genus-level annotations from the HTL-PW and control reactors, respectively. The HTL-PW-fed reactor maintained robust performance, with microbial community analysis revealing a strong association between nitrogen transformations and specific microbial taxa, thereby explaining the observed reactor stability and efficiency in nitrogen conversion. These findings demonstrate the feasibility of integrating HTL-PW into wastewater treatment systems, showing that recirculating HTL-PW at the tested concentrations does not adversely affect nitrogen transformations, supports stable nitrification and denitrification, ensures complete ammonium utilisation, and promotes diverse and dynamic microbial communities similar to those in full-scale wastewater treatment plants.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"276 ","pages":"Article 123254"},"PeriodicalIF":11.4,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143367657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metal sulfides in aged-coarse sands tailings facilitate naphthenic acids removal from oil sands process water

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

Water Research

Pub Date : 2025-02-08 DOI: 10.1016/j.watres.2025.123253

Muhammad Arslan, Muhammad Usman, Mohamed Gamal El-Din

The use of natural substrates for oil sands process water (OSPW) reclamation offers advantages such as onsite availability and scalability. This study evaluated potential of aged and fresh coarse sand tailings (CST) towards removal of classical naphthenic acids (NAs) from a real OSPW obtained from an oil sands’ tailing ponds in Alberta (NAs: 4.87 mg/L). Aged-CST achieved superior removal efficiencies of NAs (96.5 %), aromatics (>90 %), and acid-extractable organics (∼95 %), compared to fresh-CST, which showed limited removal (∼34.3 %) similar to conventional slow sand filters (∼30–45 %). Although limited surface area of both CST materials (∼1.82 m²/g) was not conducive to physical adsorption, the oxidation of metal sulfides in aged-CST enhanced the chemical reactivity, surface heterogeneity, and microbial activity, facilitating efficient adsorption, precipitation, and biodegradation of NAs. Kinetics modelling indicated that aged-CST strongly fit the pseudo-second order (R² = 0.969, k₂ = 0.003 g mg⁻¹ h⁻¹) and Elovich model (R² = 0.876, 1/b = 1.713 mg g⁻¹), indicating chemisorption as dominant removal mechanism, while fresh-CST exhibited poor fits and limited performance. Fourier-transform infrared spectroscopy and synchronous fluorescence spectroscopy analyses revealed that intensities of hydroxyl groups, aliphatic, carboxylic, and ester compounds significantly increased in aged-CST after filtration. A labelled isotope desorption study using Lauric-D23 acid cross-verified that adsorption and precipitation (∼65 %) with metal sulfides were key mechanisms, while remaining ∼35 % were chemically transformed by-products, as indicated by mass balance. Microbial community analysis showed that aged-CST had higher microbial richness (Chao1 ∼1000) compared to fresh-CST (∼500, respectively). Hydrocarbon-degrading bacteria (e.g., Rhodococcus and Sphingomonas) and acidophilic bacteria (Bryobacter, Candidatus Solibacter) were dominant in aged-CST, facilitating NAs biodegradation. BE-SPME analysis confirmed successful removal (∼86 %) of bioavailable organics removing toxicity. This study highlights aged-CST as a viable natural substrate for OSPW reclamation, offering insights into its fate and opportunities for resource recovery.

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引用次数: 0

Simultaneous removal of hardness and organic matter from oilfield-produced water by microbially induced calcite precipitation

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

Water Research

Pub Date : 2025-02-08 DOI: 10.1016/j.watres.2025.123252

Miao Zhang , Biao Wei , Hao Liu , Daoqing Liu , Geoffrey Michael Gadd , Qianwei Li , Chunmao Chen

Oilfield-produced water (PW), the largest by-product of petroleum extraction, presents significant treatment challenges due to high concentrations of total dissolved solids, heavy metals, and organic compounds. In this study, a ureolytic bacterium Staphylococcus succinus J3, with efficient petroleum degradation and microbially induced calcite precipitation (MICP) capabilities, was screened for simultaneous removal of hardness ions and organic pollutants from PW. Strain J3 showed excellent removal of Ca²⁺ (95 %), organic contaminants (62 %), and heavy metals (100 % for As and Mn, 94 % for Cu, 71 % for Ba) in high salinity PW under low nutrient conditions. Mechanistic analysis revealed that the bacteria removed organic pollutants through biodegradation, and the biominerals generated by MICP further accelerated the removal of organic contaminants through adsorption. Meanwhile, molecular characterization via FT-ICR MS demonstrated the conversion of large organic molecules into smaller, less toxic compounds, facilitating the downstream treatment of PW. Furthermore, the ammonium by-product (NH₄-N) from urea hydrolysis was efficiently recovered (83.73 %) as ammonium sulfate for agricultural production through Donnan dialysis (DD). This research presents a promising new approach for the pre-treatment of high-hardness organic wastewater and provides molecular-level insights into the mechanisms of organic matter removal, thus supporting the advancement and optimization of PW recycling technology.

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引用次数: 0

Enhanced ice slurry with low oxidant consumption for ultrafast in-situ removal of micropollutants sheltered in sediments of water supply pipelines

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

Water Research

Pub Date : 2025-02-08 DOI: 10.1016/j.watres.2025.123256

Yujing Huang , Chang Liu , Yu Shao , Yiyi Ma , Shuang Song , Feilong Dong , Tuqiao Zhang

The cleaning of water supply pipelines represents an increasingly prevalent global practice with the aim of providing high-quality drinking water. Ice pigging, a widely-utilized pipe cleaning technique, can effectively remove substantial sediment sediments from pipe walls. During this process, micropollutants adsorbed to the sediments are inevitably released into the effluent, posing a potential threat to public health. Existing technologies can only address these micropollutants through various post-treatment methods. To improve pipeline cleaning efficiency and reduce costs, we have developed an enhanced ice slurry by adding a minute quantity of peroxymonosulfate (PMS) into the base ice slurry for ultrafast, in-situ removal of micropollutants within sediments. Comparative studies with the base ice slurry demonstrate a significant enhancement in the removal efficiency of the common micropollutant carbamazepine (CBZ) using the enhanced ice slurry. While the removal efficiency of CBZ ranged from 16 to 23 % with increasing NaCl content from 3 to 7 wt% over 10 min for the base ice slurry, nearly complete removal of CBZ was achieved within 1 min by introducing 10 μM PMS into the base ice slurry. The influence of operational parameters (e.g., PMS and Cl^- concentrations, cleaning flow velocity) and pipeline characteristics (e.g., CBZ and Fe²⁺ concentrations, turbidity, pipe sediment) on CBZ removal efficiency was comprehensively examined for the enhanced ice slurry. The enhanced micropollutant removal process was mainly driven by active species such as hydroxyl and sulfate. Remarkably, chlorinated byproducts were scarcely detected during ice pigging, and the degradation products exhibited minimal ecotoxicity. With a cost of 0.16 Euro per cubic meter of cleaned pipe, the enhanced ice slurry presents a notable economic advantage over alternative methods. Overall, the enhanced ice slurry offers an environmentally friendly, cost-effective, and efficient solution for reducing micropollutants in water supply systems.

清洗供水管道是全球日益普遍的做法，目的是提供高质量的饮用水。冰猪清洗是一种广泛使用的管道清洗技术，可有效清除管道壁上的大量沉积物。在此过程中，吸附在沉积物上的微污染物不可避免地会释放到污水中，对公众健康构成潜在威胁。现有技术只能通过各种后处理方法来处理这些微污染物。为了提高管道清洁效率并降低成本，我们开发了一种增强型冰浆，在基础冰浆中加入微量过一硫酸盐（PMS），以实现超快、原位去除沉积物中的微污染物。与基础冰浆的比较研究表明，使用增强型冰浆可显著提高对常见微污染物卡马西平（CBZ）的去除效率。在基础冰浆中，随着氯化钠含量（3-7 wt%）的增加，10 分钟内对 CBZ 的去除率在 16-23% 之间，而在基础冰浆中引入 10 μM PMS 后，1 分钟内就能几乎完全去除 CBZ。针对增强型冰浆，全面考察了运行参数（如 PMS 和 Cl- 浓度、清洗流速）和管道特性（如 CBZ 和 Fe2+ 浓度、浊度、管道沉积物）对 CBZ 去除效率的影响。增强的微污染物去除过程主要由羟基和硫酸盐等活性物种驱动。值得注意的是，在冰渣处理过程中几乎检测不到氯化副产品，降解产物的生态毒性也很小。每立方米清洁管道的成本为 0.16 欧元，与其他方法相比，强化冰浆具有显著的经济优势。总之，强化冰浆为减少供水系统中的微污染物提供了一种环保、经济、高效的解决方案。

{"title":"Enhanced ice slurry with low oxidant consumption for ultrafast in-situ removal of micropollutants sheltered in sediments of water supply pipelines","authors":"Yujing Huang , Chang Liu , Yu Shao , Yiyi Ma , Shuang Song , Feilong Dong , Tuqiao Zhang","doi":"10.1016/j.watres.2025.123256","DOIUrl":"10.1016/j.watres.2025.123256","url":null,"abstract":"<div><div>The cleaning of water supply pipelines represents an increasingly prevalent global practice with the aim of providing high-quality drinking water. Ice pigging, a widely-utilized pipe cleaning technique, can effectively remove substantial sediment sediments from pipe walls. During this process, micropollutants adsorbed to the sediments are inevitably released into the effluent, posing a potential threat to public health. Existing technologies can only address these micropollutants through various post-treatment methods. To improve pipeline cleaning efficiency and reduce costs, we have developed an enhanced ice slurry by adding a minute quantity of peroxymonosulfate (PMS) into the base ice slurry for ultrafast, in-situ removal of micropollutants within sediments. Comparative studies with the base ice slurry demonstrate a significant enhancement in the removal efficiency of the common micropollutant carbamazepine (CBZ) using the enhanced ice slurry. While the removal efficiency of CBZ ranged from 16 to 23 % with increasing NaCl content from 3 to 7 wt% over 10 min for the base ice slurry, nearly complete removal of CBZ was achieved within 1 min by introducing 10 μM PMS into the base ice slurry. The influence of operational parameters (e.g., PMS and Cl<sup>-</sup> concentrations, cleaning flow velocity) and pipeline characteristics (e.g., CBZ and Fe<sup>2+</sup> concentrations, turbidity, pipe sediment) on CBZ removal efficiency was comprehensively examined for the enhanced ice slurry. The enhanced micropollutant removal process was mainly driven by active species such as hydroxyl and sulfate. Remarkably, chlorinated byproducts were scarcely detected during ice pigging, and the degradation products exhibited minimal ecotoxicity. With a cost of 0.16 Euro per cubic meter of cleaned pipe, the enhanced ice slurry presents a notable economic advantage over alternative methods. Overall, the enhanced ice slurry offers an environmentally friendly, cost-effective, and efficient solution for reducing micropollutants in water supply systems.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"276 ","pages":"Article 123256"},"PeriodicalIF":11.4,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143371653","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

CO2 agitation combined with magnetized biochar to alleviate “ammonia inhibited steady-state”: Exploring the mechanism by combining metagenomics with macroscopic indicators

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

Water Research

Pub Date : 2025-02-07 DOI: 10.1016/j.watres.2025.123250

Jiadong Yu , Muhammad Usman , Fan Liu , Franziska Schäfer , Yuhan Shen , Zehui Zheng , Yafan Cai

The “ammonia inhibited steady-state” phenomenon is frequently observed in the anaerobic digestion (AD) process of nitrogen-rich substrates. Reconfiguring microbial ecosystems has proven to be an effective strategy for mitigating ammonia inhibition. In the current study, biochars were screened and targeted for modification. CO₂ agitation combined with magnetized biochar was used to aid the semi-continuous AD systems with “ammonia inhibited steady-state.” The results indicated that coconut shell biochar had the best stimulating effect on AD performance. The content of oxygen-containing functional groups (OCFGs), which had a positive correlation with the electron donating capacity (EDC), was targeted to be regulated. This strategy significantly increased the CH₄ yield by 31.7 % (from 344 to 278 mL/g VS) (p < 0.05). Isotope tracing and KEGG gene annotation indicated that this strategy stimulated the efficiency of the hydrogenotrophic pathway. Simultaneously, it accelerated the attachment of microorganisms, which made the DIET pathway between bacteria and archaea efficient. Under CO₂ agitation, the attachment of functional microorganisms to the biochar accelerated. Biochar weakened the synthesis of bioelectronic carriers (Cyt-c and chemosensory pili), while the electroactivity of the AD system was enhanced. This means that biochar replaced bioelectronic carriers and improved the DIET efficiency. In addition, the strategy had a positive effect on the colonization of simultaneous nitrification-denitrifying bacteria (Georgenia), which led to a decrease in ammonia nitrogen concentrations. This study revealed the mechanism by which this strategy alleviates ammonia inhibition and provided a promising strategy for the efficient AD of nitrogen-rich substrates.

{"title":"CO2 agitation combined with magnetized biochar to alleviate “ammonia inhibited steady-state”: Exploring the mechanism by combining metagenomics with macroscopic indicators","authors":"Jiadong Yu , Muhammad Usman , Fan Liu , Franziska Schäfer , Yuhan Shen , Zehui Zheng , Yafan Cai","doi":"10.1016/j.watres.2025.123250","DOIUrl":"10.1016/j.watres.2025.123250","url":null,"abstract":"<div><div>The “ammonia inhibited steady-state” phenomenon is frequently observed in the anaerobic digestion (AD) process of nitrogen-rich substrates. Reconfiguring microbial ecosystems has proven to be an effective strategy for mitigating ammonia inhibition. In the current study, biochars were screened and targeted for modification. CO<sub>2</sub> agitation combined with magnetized biochar was used to aid the semi-continuous AD systems with “ammonia inhibited steady-state.” The results indicated that coconut shell biochar had the best stimulating effect on AD performance. The content of oxygen-containing functional groups (OCFGs), which had a positive correlation with the electron donating capacity (EDC), was targeted to be regulated. This strategy significantly increased the CH<sub>4</sub> yield by 31.7 % (from 344 to 278 mL/g VS) (<em>p</em> < 0.05). Isotope tracing and KEGG gene annotation indicated that this strategy stimulated the efficiency of the hydrogenotrophic pathway. Simultaneously, it accelerated the attachment of microorganisms, which made the DIET pathway between bacteria and archaea efficient. Under CO<sub>2</sub> agitation, the attachment of functional microorganisms to the biochar accelerated. Biochar weakened the synthesis of bioelectronic carriers (Cyt-c and chemosensory pili), while the electroactivity of the AD system was enhanced. This means that biochar replaced bioelectronic carriers and improved the DIET efficiency. In addition, the strategy had a positive effect on the colonization of simultaneous nitrification-denitrifying bacteria (<em>Georgenia</em>), which led to a decrease in ammonia nitrogen concentrations. This study revealed the mechanism by which this strategy alleviates ammonia inhibition and provided a promising strategy for the efficient AD of nitrogen-rich substrates.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"276 ","pages":"Article 123250"},"PeriodicalIF":11.4,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143258220","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

Self-replenishing neutral Fenton-like treatment for emerging contaminants through single Fe atom electron configuration regulation

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

Water Research

Pub Date : 2025-02-07 DOI: 10.1016/j.watres.2025.123251

Wen-Min Wang , Wen-Long Wang , Lin Gan , Yuxiong Huang , Danmeng Shuai , Min-Yong Lee , Qian-Yuan Wu

Fenton technology is promising for removing recalcitrant and toxic organic contaminants for wastewater purification. Neutral Fenton technology is preferred for its reduced acid usage and improved operational convenience. However, the challenges are the low production of reactive species and the limited conversion of high-valent iron (Fe) to low-valent Fe. This study introduced a new cycle employing high-valent iron-oxo species [Fe(IV)=O], which directly participates in degradation, facilitating Fe regeneration. To achieve it, we developed an O-doped single Fe atom catalyst (SACs, Fe-N₃O₁) to promote the efficient Fe(IV)=O generation. The O-doping improved the acetaminophen degradation rate constant and turnover frequency of Fe-N₃O₁ by approximately tenfold, and elevated the steady-state concentration of Fe(IV)=O 65 times over. The normalized degradation rate constant of Fe-N₃O₁/H₂O₂ was superior to other reported catalysts. Density functional theory calculations indicated that O-doping decreased the charge density of Fe site, enhanced the metal–oxygen bond strength, and reduced the energy barrier for the key reaction intermediate (*O + *H₂O), facilitating the efficient and selective formation of Fe(IV)=O. Fe-N₃O₁/H₂O₂ demonstrated wide pH tolerance, high resistance to complex water matrices, and excellent stability, making it promising for practical applications. This study provides a new perspective on controlling the selective generation of reactive species to achieve sustainable neutral Fenton-like reactions.

{"title":"Self-replenishing neutral Fenton-like treatment for emerging contaminants through single Fe atom electron configuration regulation","authors":"Wen-Min Wang , Wen-Long Wang , Lin Gan , Yuxiong Huang , Danmeng Shuai , Min-Yong Lee , Qian-Yuan Wu","doi":"10.1016/j.watres.2025.123251","DOIUrl":"10.1016/j.watres.2025.123251","url":null,"abstract":"<div><div>Fenton technology is promising for removing recalcitrant and toxic organic contaminants for wastewater purification. Neutral Fenton technology is preferred for its reduced acid usage and improved operational convenience. However, the challenges are the low production of reactive species and the limited conversion of high-valent iron (Fe) to low-valent Fe. This study introduced a new cycle employing high-valent iron-oxo species [Fe(IV)=O], which directly participates in degradation, facilitating Fe regeneration. To achieve it, we developed an O-doped single Fe atom catalyst (SACs, Fe-N<sub>3</sub>O<sub>1</sub>) to promote the efficient Fe(IV)=O generation. The O-doping improved the acetaminophen degradation rate constant and turnover frequency of Fe-N<sub>3</sub>O<sub>1</sub> by approximately tenfold, and elevated the steady-state concentration of Fe(IV)=O 65 times over. The normalized degradation rate constant of Fe-N<sub>3</sub>O<sub>1</sub>/H<sub>2</sub>O<sub>2</sub> was superior to other reported catalysts. Density functional theory calculations indicated that O-doping decreased the charge density of Fe site, enhanced the metal–oxygen bond strength, and reduced the energy barrier for the key reaction intermediate (*O + *H<sub>2</sub>O), facilitating the efficient and selective formation of Fe(IV)=O. Fe-N<sub>3</sub>O<sub>1</sub>/H<sub>2</sub>O<sub>2</sub> demonstrated wide pH tolerance, high resistance to complex water matrices, and excellent stability, making it promising for practical applications. This study provides a new perspective on controlling the selective generation of reactive species to achieve sustainable neutral Fenton-like reactions.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"276 ","pages":"Article 123251"},"PeriodicalIF":11.4,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143258219","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

Building plumbing influences the microdiversity and community assembly of the drinking water microbiome

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

Water Research

Pub Date : 2025-02-06 DOI: 10.1016/j.watres.2025.123244

Huanqi He , Linxuan Huo , Solize Oosthuizen-Vosloo , Kelsey J. Pieper , Aron Stubbins , Byungman Yoon , Ameet J. Pinto

Building plumbing microbial communities can significantly influence water quality at the point of use, particularly during periods of stagnation. Thus, a fine-scale understanding of factors governing community membership and structure, as well as environmental and ecological factors shaping building plumbing microbial communities is critical. In this study, we utilized full-length 16S ribosomal RNA (rRNA) gene sequencing to investigate the microdiversity and spatial-temporal dynamics of microbial communities in institutional and residential building plumbing systems. Bacterial operational taxonomic units (OTUs) within institutional buildings exhibited much lower microdiversity relative to the same OTUs in residential buildings. Higher microdiversity was associated with higher persistence and relative abundance of OTUs. Interestingly, amplicon sequencing variants within the same OTUs exhibited habitat preferences based on the building type while also demonstrating varying temporal turnover patterns. Dispersal limitation disproportionately governed community assembly in institutional buildings, whereas heterogeneous selection was the dominant ecological mechanism shaping the microbial community in residential buildings. Dispersal limitation in institutional buildings is consistent with larger building sizes and greater periods of water stagnation. Interestingly, the inability to explain the extent of heterogeneous selection-driven community assembly in residential locations using measured water chemistry may suggest a disproportionately large effect of fine-scale variation in plumbing characteristics on community assembly in residential locations.

{"title":"Building plumbing influences the microdiversity and community assembly of the drinking water microbiome","authors":"Huanqi He , Linxuan Huo , Solize Oosthuizen-Vosloo , Kelsey J. Pieper , Aron Stubbins , Byungman Yoon , Ameet J. Pinto","doi":"10.1016/j.watres.2025.123244","DOIUrl":"10.1016/j.watres.2025.123244","url":null,"abstract":"<div><div>Building plumbing microbial communities can significantly influence water quality at the point of use, particularly during periods of stagnation. Thus, a fine-scale understanding of factors governing community membership and structure, as well as environmental and ecological factors shaping building plumbing microbial communities is critical. In this study, we utilized full-length 16S ribosomal RNA (rRNA) gene sequencing to investigate the microdiversity and spatial-temporal dynamics of microbial communities in institutional and residential building plumbing systems. Bacterial operational taxonomic units (OTUs) within institutional buildings exhibited much lower microdiversity relative to the same OTUs in residential buildings. Higher microdiversity was associated with higher persistence and relative abundance of OTUs. Interestingly, amplicon sequencing variants within the same OTUs exhibited habitat preferences based on the building type while also demonstrating varying temporal turnover patterns. Dispersal limitation disproportionately governed community assembly in institutional buildings, whereas heterogeneous selection was the dominant ecological mechanism shaping the microbial community in residential buildings. Dispersal limitation in institutional buildings is consistent with larger building sizes and greater periods of water stagnation. Interestingly, the inability to explain the extent of heterogeneous selection-driven community assembly in residential locations using measured water chemistry may suggest a disproportionately large effect of fine-scale variation in plumbing characteristics on community assembly in residential locations.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"276 ","pages":"Article 123244"},"PeriodicalIF":11.4,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143192177","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

Exploring carbon dynamics in a slow sand filter using stable isotopes

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

Water Research

Pub Date : 2025-02-06 DOI: 10.1016/j.watres.2025.123249

Bayan Khojah , Salima Sadeghi , Lubos Polerecky , Jack J. Middelburg , Dick van Oevelen , Marcel T.J. van der Meer , Thilo Behrends

Slow sand filtration (SSF) is one of the oldest biofiltration methods for reducing pathogens and organic matter (OM) in water. Due to its efficiency, affordability, and operational simplicity, SSF remains a widely used approach for producing biologically stable drinking water. Although biological activity plays a role in the removal of OM during SSF, its contribution is poorly constrained. Here, we explored the utility of stable isotopes for investigating this role quantitatively on the scale of an operational filter. First, by combining measurements of concentrations and natural isotopic composition in relevant carbon pools (dissolved and solid, organic and inorganic), we found evidence for OM removal through both retention and subsequent mineralization. However, their relative contributions could not be constrained due to insufficient precision and continuity of available data and incomplete knowledge about the relevant isotope fractionation factors. In the other approach, we therefore used laboratory incubations of SSF cores with ¹³C-labeled glucose over 14 days and found rapid removal of the tracer by the biological community, exceeding the assimilable organic carbon loading rate of the operational filter by 18 times. The glucose removal was not limited to the upper part of the sand column, the schmutzdecke, but occurred throughout the entire sand column. Furthermore, the removal was dominated by bacterial uptake over mineralization, with a substantial part likely retained as carbon reserves. The residence time of the tracer exceeded the duration of the experiment, hampering our ability to estimate the rate of OM mineralization. Analysis of the meiofauna indicated that grazing and/or predation constitutes only a minor sink for the bacterial biomass in the studied filter. Overall, this study illustrates the potential of stable isotopes for studying biological processes in SSF systems, including OM removal under diverse conditions, maturation of new or recently cleaned filters, or interactions within the endogenous biological community. To fully utilize this potential, future work should employ isotope labeling experiments with a longer duration, and consider more systematic and precise monitoring of the concentrations and isotopic composition in the relevant carbon pools.

{"title":"Exploring carbon dynamics in a slow sand filter using stable isotopes","authors":"Bayan Khojah , Salima Sadeghi , Lubos Polerecky , Jack J. Middelburg , Dick van Oevelen , Marcel T.J. van der Meer , Thilo Behrends","doi":"10.1016/j.watres.2025.123249","DOIUrl":"10.1016/j.watres.2025.123249","url":null,"abstract":"<div><div>Slow sand filtration (SSF) is one of the oldest biofiltration methods for reducing pathogens and organic matter (OM) in water. Due to its efficiency, affordability, and operational simplicity, SSF remains a widely used approach for producing biologically stable drinking water. Although biological activity plays a role in the removal of OM during SSF, its contribution is poorly constrained. Here, we explored the utility of stable isotopes for investigating this role quantitatively on the scale of an operational filter. First, by combining measurements of concentrations and natural isotopic composition in relevant carbon pools (dissolved and solid, organic and inorganic), we found evidence for OM removal through both retention and subsequent mineralization. However, their relative contributions could not be constrained due to insufficient precision and continuity of available data and incomplete knowledge about the relevant isotope fractionation factors. In the other approach, we therefore used laboratory incubations of SSF cores with <sup>13</sup>C-labeled glucose over 14 days and found rapid removal of the tracer by the biological community, exceeding the assimilable organic carbon loading rate of the operational filter by 18 times. The glucose removal was not limited to the upper part of the sand column, the schmutzdecke, but occurred throughout the entire sand column. Furthermore, the removal was dominated by bacterial uptake over mineralization, with a substantial part likely retained as carbon reserves. The residence time of the tracer exceeded the duration of the experiment, hampering our ability to estimate the rate of OM mineralization. Analysis of the meiofauna indicated that grazing and/or predation constitutes only a minor sink for the bacterial biomass in the studied filter. Overall, this study illustrates the potential of stable isotopes for studying biological processes in SSF systems, including OM removal under diverse conditions, maturation of new or recently cleaned filters, or interactions within the endogenous biological community. To fully utilize this potential, future work should employ isotope labeling experiments with a longer duration, and consider more systematic and precise monitoring of the concentrations and isotopic composition in the relevant carbon pools.</div></div>","PeriodicalId":443,"journal":{"name":"Water Research","volume":"276 ","pages":"Article 123249"},"PeriodicalIF":11.4,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143192176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0