Journal of contaminant hydrology最新文献

{"title":"Removal efficiency and microbial community shifts in full-scale versus laboratory-scale bank filtration systems using horizontal collector wells.","authors":"Sang Yeob Kim, Jin Hyung Noh, Minjoo Lee, Joonhong Park, Young Joo Lee, Jeong Joo Park, Heejong Son, Woorim Lee, Feifei Wang, Sung Kyu Maeng","doi":"10.1016/j.jconhyd.2025.104689","DOIUrl":"10.1016/j.jconhyd.2025.104689","url":null,"abstract":"<p><p>Climate-induced changes in dissolved organic matter (DOM) and trace organic contaminants (TrOCs) present growing challenges for drinking water treatment, particularly in surface water-dependent regions. Bank filtration (BF), a natural subsurface treatment process, offers a sustainable solution, but its performance and scalability require further validation. This study simultaneously assesses the performance of laboratory-scale and full-scale BF systems using a horizontal collector well (HCW), both receiving the same source water and aquifer materials, to remove DOM and TrOCs, and to investigate changes in microbial communities under equivalent residence times (20 days). The full-scale HCW system achieved a 63.0 % DOM removal rate compared to 37.0 % in laboratory-scale columns, effectively reducing biopolymers and humic substances through soil passage. Microbial analysis revealed distinct shifts, with Proteobacteria comprising 80.1 % of the full-scale filtrate compared to 59.1 % in the laboratory-scale. Total cell counts and microbial activity decreased by 85.0 % and 90.4 % in the full-scale system, respectively. The removal efficiency for 60 selected TrOCs varied by their properties: hydrophobic ionic compounds achieved high removal (91.2 %), while hydrophilic and neutral compounds, including perfluoroalkyl substances (PFAS), showed lower removal rates (37.3 % and 24.5 %, respectively). Pharmaceuticals, steroid hormones, and pesticides were effectively removed, with some exceeding 99.9 %. This study is the first to directly compare full-scale HCW and laboratory-scale BF systems under controlled conditions. These findings highlight BF's effectiveness and the need for integrating complementary technologies to improve water quality and sustainability.</p>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"275 ","pages":"104689"},"PeriodicalIF":4.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144816833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Removal of Fe(II) from water using raw and calcinated weathered basalt: Influence of mineralogy and physical properties.","authors":"Ali M El Shafey, Ahmed M Zayed, Hanafy M Abd El-Salam, Mahmoud S M Abdel Wahed","doi":"10.1016/j.jconhyd.2025.104692","DOIUrl":"10.1016/j.jconhyd.2025.104692","url":null,"abstract":"<p><p>In this study, raw weathered basalt (RWB) and calcinated weathered basalt (CWB), both low-cost natural geological materials, were employed for the removal of Fe(II) from contaminated aqueous solutions and groundwater. CWB was prepared by calcining RWB at 900 °C for 3 h. Batch adsorption experiments were conducted, and the data fitted best with the Langmuir isotherm model. The adsorption kinetics followed the pseudo-second-order and intra-particle diffusion models. Although calcination improved the surface area and porosity, RWB exhibited higher Fe(II) removal efficiency, likely due to its richer mineralogical composition, particularly the clay content. The results suggest that modification by calcination does not necessarily enhance adsorption performance. The proposed mechanisms involve chemisorption, electrostatic attraction, cation exchange, surface complexation, and adsorption-oxidation. Additionally, RWB showed better performance than CWB in reducing Mn, Ca hardness, NH₃, NO₃^-, NO₂^-, and TDS during groundwater treatment. Therefore, RWB offers a more cost-effective and sustainable option for water purification without requiring energy-intensive modification.</p>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"275 ","pages":"104692"},"PeriodicalIF":4.4,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144812024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photocatalytic remediation of river ganga waters using TiO₂ nanoparticles: Linking structural and magnetic properties to aquatic water quality improvement","authors":"Chandra Kiran ,&nbsp;Parth Patel ,&nbsp;Santosh Kumar Sahoo ,&nbsp;Ariful Rahaman ,&nbsp;Virendra Kumar Verma","doi":"10.1016/j.jconhyd.2025.104723","DOIUrl":"10.1016/j.jconhyd.2025.104723","url":null,"abstract":"<div><div>Freshwater contamination from industrial, agricultural, and domestic activities remains a serious environmental challenge, particularly in the Ganga River basin of India. In this work, the photocatalytic activity of TiO₂ nanoparticles was evaluated for treating real wastewater samples collected from three polluted sources. Photocatalysis led to marked improvements in water quality, including substantial reductions in COD and BOD, stabilization of pH to near-neutral values, and partial reduction of dissolved solids. Material characterizations confirmed the durability of TiO₂ during treatment. XRD verified anatase phase stability, SEM–EDS revealed unchanged morphology with decreased oxygen vacancies, and magnetization measurements showed reduced values consistent with vacancy annihilation and Ti³⁺ re-oxidation. These changes correlate with enhanced oxidative processes responsible for pollutant degradation. Overall, TiO₂ demonstrated robust performance, reusability, and structural stability, underscoring its promise as a sustainable photocatalyst for decentralized water treatment in polluted riverine and industrial regions.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"276 ","pages":"Article 104723"},"PeriodicalIF":4.4,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microplastic contamination across trophic levels in a lowland spring watercourse of Northwestern Italy: New insights and biomonitoring implications","authors":"Marco Bertoli ,&nbsp;Paolo Pastorino ,&nbsp;Serena Anselmi ,&nbsp;Tecla Bentivoglio ,&nbsp;Giuseppe Esposito ,&nbsp;Giorgia Goriup ,&nbsp;Antonia Concetta Elia ,&nbsp;Marino Prearo ,&nbsp;Monia Renzi ,&nbsp;Elisabetta Pizzul","doi":"10.1016/j.jconhyd.2025.104726","DOIUrl":"10.1016/j.jconhyd.2025.104726","url":null,"abstract":"<div><div>Microplastic (MP) pollution is an emerging environmental threat, with freshwater ecosystems acting as both transport pathways and accumulation zones for these synthetic particles. Despite growing research, data on MP contamination in small, lowland spring watercourses remain scarce. This study investigates MP distribution in the Sacchetti Ditch, a lowland spring-fed stream in Northwestern Italy, through by-monthly sampling over one year, leading to insights about seasonal trends. MP occurrence was analyzed in water, sediment, and biotic compartments, including fish, macroinvertebrates, and bivalves. MP concentrations in water ranged from 27.2 ± 47.1 MP L⁻¹ (March) to 61.2 ± 20.4 MP L⁻¹ (May), while sediment levels peaked at 358.6 ± 224.1 MP kg⁻¹ in January. Fragments and fibers dominated across matrices, with black, red, and blue as the most common colors. Statistical analyses revealed no significant temporal trends, suggesting continuous MP inputs from untreated wastewater discharge, urban runoff, and industrial effluents. Biotic samples confirmed MP ingestion across trophic levels. <em>Gambusia affinis</em> and <em>Gammarus fossarum</em> exhibited the highest MP burdens in winter, while <em>Unio elongatulus</em> showed a strong correlation with waterborne MPs. Polymer analysis identified polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), and polyamide (PA), with PP showing significant selective ingestion by <em>U. elongatulus</em>. Non-Metric Multi-Dimensional Scaling (NMDS) analysis of seasonal MP content in both biotic and abiotic samples indicated no clear seasonal patterns across trophic levels, reinforcing the role of the ditch as a long-term MPs reservoir. These findings highlight the need for urgent mitigation measures to reduce persistent MP pollution in small freshwater ecosystems.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"276 ","pages":"Article 104726"},"PeriodicalIF":4.4,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Divergence in anthropogenic activities contributed to the eutrophication heterogeneity between river and lake at basin scale: new insights from trophic state index in Asia's largest basin (Yangtze River)","authors":"Yan Dai ,&nbsp;Xihua Wang ,&nbsp;Y. Jun Xu ,&nbsp;Qinya Lv ,&nbsp;Xuming Ji ,&nbsp;Boyang Mao ,&nbsp;Shunqing Jia ,&nbsp;Zejun Liu ,&nbsp;Chengming Luo ,&nbsp;Yanxin Rong","doi":"10.1016/j.jconhyd.2025.104717","DOIUrl":"10.1016/j.jconhyd.2025.104717","url":null,"abstract":"<div><div>Eutrophication caused by excessive nutrient inputs from intense anthropogenic activities seriously threatens the ecological health of river and lake systems worldwide. However, previous eutrophication studies have focused mostly on lakes, with little attention paid to rivers, and the anthropogenic driving mechanisms of eutrophication heterogeneity between rivers and lakes within large-scale basins remain unclear. In this study, the seasonal and regional characteristics of eutrophication in rivers and lakes within the Yangtze River Basin were analyzed from 2021 to 2023. The relationship between anthropogenic activities and the eutrophication heterogeneity between rivers and lakes was determined by considering population and land use factors. The results showed that the eutrophication of both rivers and lakes was more severe in the downstream area than upstream and midstream area, and intensified during the wet season compared to the normal and dry seasons. On average, 63.2 % and 20.7 % of the river stations were at eutrophic and meso-eutrophic states, respectively; and an average of 26.3 % and 44.2 % of lake stations were at eutrophic and meso-eutrophic states, respectively. Correlation analysis revealed significant differences in human-driven eutrophication mechanisms between rivers and lakes. The trophic states of river systems acutely reflected short-term anthropogenic pressures, while lake systems predominantly manifest the long-term cumulative effects of nutrients generated by land use within the watershed. This study can provide reliable support for targeted management of eutrophication in different water bodies in large-scale basins.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"276 ","pages":"Article 104717"},"PeriodicalIF":4.4,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145026329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oxidative dissolution of nano- and microparticles of lead in water","authors":"Gennadii L. Bykov,&nbsp;Vadim A. Ershov,&nbsp;Boris G. Ershov","doi":"10.1016/j.jconhyd.2025.104709","DOIUrl":"10.1016/j.jconhyd.2025.104709","url":null,"abstract":"<div><div>Lead is an extremely hazardous pollutant that poses a severe threat to the ecosystem. It enters the atmosphere in the form of nano- and microparticles and is then carried by wind and water. These particles easily dissolve in water, turning into ions which are easily absorbed by living organisms. Thus, lead quickly spreads throughout the environment, harming the ecosystem. This paper explores the state and transformation of nano- and microparticles of lead, focusing on the formation and properties of their dispersions in water, both deaerated and aerated. In deaerated water, the metal dispersion is unstable; microparticles agglomerate and eventually settle. When exposed to air, lead microparticles undergo rapid oxidation and dissolution. Oxidative dissolution accelerates with increasing acidity. The dissolution process follows an electrochemical mechanism: first, a poorly soluble oxide forms, which then reacts with hydrogen ions to dissolve. The calculated activation energy for the oxidative dissolution of lead microparticles in water is 41.6 ± 3.1 kJ mol⁻¹.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"276 ","pages":"Article 104709"},"PeriodicalIF":4.4,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145005153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced effect and mechanism of biochar on the nitrogen removal of low C/N wastewater by cold-tolerant heterotrophic nitrifying–aerobic denitrifying bacterium","authors":"Xiaoyu Li,&nbsp;Meizhen Tang,&nbsp;Jie Jiang,&nbsp;Shiqiang Ma,&nbsp;Shumin Yao,&nbsp;Yuewei Yang","doi":"10.1016/j.jconhyd.2025.104708","DOIUrl":"10.1016/j.jconhyd.2025.104708","url":null,"abstract":"<div><div>Biological denitrification is an essential method for sewage treatment, though its efficiency is often constrained by low temperatures and insufficient organic carbon sources. In this study, a novel cold-tolerant heterotrophic nitrification–aerobic denitrification bacterium, <em>Pseudomonas fluorescens</em> sp. Z03, was isolated from activated sludge, and its denitrification performance was evaluated. Meanwhile the effect and mechanism of biochar in enhancing denitrification of low C/N wastewater by <em>P. fluorescens</em> Z03 were also investigated. The results showed that <em>P. fluorescens</em> Z03 effectively removed various nitrogen species at 10 °C, with maximum removal rates of ammonia, nitrite, and nitrate being 1.75 mg/(L·h), 1.63 mg/(L·h), and 1.67 mg/(L·h), respectively. The NH₄⁺-N removal efficiency of Z03 was significant enhanced by 3:1 mixed biochar, reaching 92.79 % at 48 h, which was 66.18 % higher than that of R_CK. The reason for this can be attributed to the mixed biochar combined the beneficial properties of both BC400 and BC700, including a large surface area and pore size, a high concentration of active functional groups, a relatively high dissolved organic carbon content, and favorable oxidation-reduction potential. Therefore, R_M31 exhibited the most significant enhancement, and the NH₄⁺-N removal efficiency was 92.79 % at 48 h, which was 66.18 % and 8.55 % - 35.78 % higher than that of R_CK and other biochar groups. In addition, the 3:1 mixed biochar coupled with <em>P. fluorescens</em> Z03 has a long – term and high - efficiency effect on improving the nitrogen removal efficiency of piggery sewage. These findings highlight the potential of combining 3:1 mixed biochar with <em>P. fluorescens</em> Z03 for the treatment of low C/N wastewater at low temperatures. These findings have confirmed the feasibility of using 3:1 mixed biochar combined strain Z03 for low C/N wastewater treatment at low temperature, and have important practical significance.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"276 ","pages":"Article 104708"},"PeriodicalIF":4.4,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic non–equilibrium effects (DNEs) of imbibition processes in an air-water two-phase fine sandy medium- a laboratory-scale experimental study","authors":"Yuhao Ai ,&nbsp;Lihua Yang ,&nbsp;Yijia Sun ,&nbsp;Xiaoyi Wu ,&nbsp;Jingya Xi ,&nbsp;Hongfan Hou ,&nbsp;Yihang Yang ,&nbsp;Pengfei Wu ,&nbsp;Yan Li","doi":"10.1016/j.jconhyd.2025.104707","DOIUrl":"10.1016/j.jconhyd.2025.104707","url":null,"abstract":"<div><div>We systematically investigated DNEs throughout imbibition processes, specifically evaluating: (1) the temporal correspondence between DNE development and changes in water saturation/capillary pressure, and (2) the dominant factors governing DNE magnitude during imbibition. The signal drift during extended testing, and the gravitational effect on both the capillary pressure and water saturation were eliminated. The results indicate that, when water saturation was below a threshold value (∼0.43), the maximum difference between static and dynamic capillary pressures (DPMAX) occurred first, followed sequentially by: the maximum rate of water saturation change over time (RSMAX), minimum capillary pressure in an imbibition step (PMIN), and maximum water saturation (SMAX). In subsequent imbibition steps, this sequence shifted to: RSMAX, DPMAX, PMIN, and SMAX. For smooth imbibition processes, the order of events was: RSMAX, SMAX, PMIN and DPMAX (occurring nearly simultaneously). The imbibition process demonstrated no systematic correlation between the extremum values of capillary pressure (PMIN), water saturation (SMAX), and their respective derivatives (DPMAX, RSMAX). Lag times between consecutive parameter pairs (DPMAX, RSMAX, PMIN, and SMAX) exhibited decreasing trends as the water saturation change rate (<em>ΔSw/Δt</em>) increased. Therefore, in stepwise imbibition processes, DNEs are primarily characterized by: (1) the lag time between initial response points of capillary pressure and water saturation (<em>Δt₁</em>), (2) the lag time between PMIN and SMAX (<em>Δt₂</em>), (3) DPMAX, and (4) the dynamic coefficient <em>τ</em> (<span><span>Hassanizadeh and Gray, 1990</span></span>). While <em>Δt₁</em> and <em>Δt₂</em> are clearly observable in both stepwise and smooth imbibition processes, they become negligible above 0.43 water saturation. Notably, the maximum dynamic effect (DPMAX) increased with increasing water saturation while τ decreased with increasing water saturation. Furthermore, results confirmed that DNE magnitudes correlated more strongly with water saturation and its rate of change (<em>ΔSw/Δt</em>) than with capillary number, consistent with previous findings. Lag times (<em>Δt₁, Δt₂</em>), τ, and DPMAX constitute meaningful quantitative parameters for characterizing DNEs in stepwise imbibition processes.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"276 ","pages":"Article 104707"},"PeriodicalIF":4.4,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145005154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unraveling nitrogen evolution characteristics and driving mechanisms of estuarine alluvial islands","authors":"Xihua Wang ,&nbsp;Yanxin Rong ,&nbsp;Y. Jun Xu ,&nbsp;Qinya lv ,&nbsp;Xuming Ji ,&nbsp;Boyang Mao ,&nbsp;Shunqing Jia ,&nbsp;Zejun Liu ,&nbsp;Chengming Luo ,&nbsp;Yan Dai","doi":"10.1016/j.jconhyd.2025.104706","DOIUrl":"10.1016/j.jconhyd.2025.104706","url":null,"abstract":"<div><div>Nitrogen pollution has long been a major threat to river and estuarine ecosystems around the world. However, at present, most of the research focuses on rivers and attached freshwater lakes, and the research on the nitrogen evolution characteristics and driving mechanisms of estuarine alluvial islands at river estuaries remains poorly understood. In this study, four cross-sections in Chongming District from 2021 to 2023, including Qixiaogang West Bridge, Qianweicun Bridge, Wuxiao, and Sanshahong Intersection were Sampled. Using Pearson correlation analysis, regression analysis and other methods to explore the correlation and trend of water quality indicators, and then reveal the spatiotemporal changes of nitrogen and its influencing factors. Our results showed that the statistical analysis revealed no significant fluctuations in ammonia nitrogen (NH₄⁺) and total nitrogen (TN) during the study period; specifically (NH₄⁺ reached 0.65 mg/L in June, while TN reached 4.36 mg/L in December). Correlation analysis revealed a negative correlation between TN, NH₄⁺, and pH, a positive correlation with dissolved oxygen (DO), and notable correlations between NH₄⁺ and turbidity and electric conductivity (EC). In addition, natural factors (rainfall) and human activities were important factors affecting nitrogen, with agricultural cultivation leading to a reduction of 78.92 km² in the study area. These results will help reveal the characteristics and driving mechanisms of nitrogen concentration in estuarine alluvial islands, propose targeted measures for future water pollution control, and provide valuable references for similar studies.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"275 ","pages":"Article 104706"},"PeriodicalIF":4.4,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144988063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Short water transit times determine the fate of veterinary pharmaceuticals in lowland catchments","authors":"Nikola Rakonjac ,&nbsp;Raphaël Miazza ,&nbsp;Andrea Rinaldo ,&nbsp;Coen J. Ritsema ,&nbsp;Paolo Benettin","doi":"10.1016/j.jconhyd.2025.104704","DOIUrl":"10.1016/j.jconhyd.2025.104704","url":null,"abstract":"<div><div>Livestock animals are commonly treated with veterinary pharmaceuticals (VPs), and their residues often enter the environment through manure applied to soil. A fraction of these residues may be further transported to surface waters through intricate transport mechanisms. Here, we examine the temporal dynamics of VPs in lowland surface waters of an agricultural catchment in the Netherlands, utilizing information on VPs concentrations in manure (2015–2020) and surface water measurements collected in 2020. We first calculate the amounts of two VPs (flubendazole and sulfadiazine) applied in the catchment of interest and analyze the local manure application practices to establish the temporal distribution of VP application. We then develop a parsimonious catchment-scale transport model for VPs that is based on time-variable water transit time distributions. The transport model considers multiple processes experienced by the VPs during their transfer to the stream network, including evapoconcentration, sorption and degradation. Despite the uncertainties associated with VP transport processes, the model accurately captures the order of magnitude of VP concentration in stream water for two VPs characterized by contrasting sorption and degradation rates. To interpret our simulations, we investigate water and solute transit times and their variability due to changing hydrological conditions. Our results suggest that, despite the mean water transit times of some years typical of lowland catchments, as well as relatively strong VP sorption or rapid degradation, detectable amounts of VPs in the order of 1–10 ng/L may reach the stream ecosystem through fast flowpaths characterized by short transit times.</div></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"276 ","pages":"Article 104704"},"PeriodicalIF":4.4,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145010960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}