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Transport model-based method for estimating micropollutant removal efficiency in riverbank filtration
Water Research ( IF 11.4 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.watres.2025.123194
Norbert Erdélyi, Dóra Gere, Eszter Fekete, Gábor Nyiri, Attila Engloner, Andrea Tóth, Tamás Madarász, Péter Szűcs, Zsuzsanna Ágnes Nagy-Kovács, Tamás Pándics, Márta Vargha

Riverbank filtration is a cost-effective and efficient method for drinking water production, using the natural filtration capacity of the river gravelbed. Removal efficiency for organic micropollutants (OMP) in field studies is generally calculated by comparing the concentrations measured in surface water and in the wells either on the same day or with a shift of fixed time interval, neither of which can account for the variability of surface water quality and travel time in the aquifer. The present study proposes a novel method based on travel time distribution determined by a numerical transport model with a hypothesis that it will provide more reliable estimate for OMP removal. The model was developed for two production sites of Budapest Waterworks, Hungary on Danube River. River water and riverbank filtered well water were sampled regularly for one year (158 samples each) and analysed for 41 OMPs (pesticides, pharmaceutical residues and industrial pollutants). Nineteen pollutants were detected in >50 % of the well water samples. Median removal rates were 4–97 %, while the concentration of five compounds increased in some wells. Removal rates of telmisartan, tramadol, sulfamethoxazole, 4-methyl-benzotriazole, 5-methyl-benzotriazole and desethyl-terbuthylazine correlated negatively to redox potential (|r|=0.456–0.805). Median travel time increased after high flow events resulting in reduced removal of telmisartan, tramadol, 4-methyl-benzotriazole and desethyl-terbuthylazine (|r|= 0.435–0.661). Removal of diatrizoate, iopamidol, tramadol and benzotriazole increased with distance from the shore (148 vs 395 m) by 25 %, 28 %, 8 %, 16 %, respectively. Background groundwater contamination increased pesticide concentration in the wells located in agricultural areas 1.5–5-fold compared to river water. The model-based method gave more consistent results compared to traditional calculations for OMP removal efficiency during the sampling campaign and allowed for estimating the impact of various environmental factors.

中文翻译:


基于运输模型的河岸过滤微污染物去除效率估算方法



河岸过滤是一种经济高效的饮用水生产方法,利用河流砾石的天然过滤能力。在实地研究中,有机微污染物 (OMP) 的去除效率通常是通过比较在同一天或以固定时间间隔的变化测量的地表水和井中测量的浓度来计算的,这两者都不能解释地表水质量和含水层中移动时间的变化。本研究提出了一种基于由数值运输模型确定的旅行时间分布的新方法,并假设它将为 OMP 去除提供更可靠的估计。该模型是为匈牙利布达佩斯自来水厂在多瑙河上的两个生产基地开发的。对河水和河岸过滤井水进行为期一年的定期采样(各 158 个样本),并分析 41 个 OMP(杀虫剂、药物残留和工业污染物)。在 >50 % 的井水样品中检测到 19 种污染物。中位去除率为 4-97%,而在某些孔中,五种化合物的浓度增加。替米沙坦、曲马多、磺胺甲噁唑、4-甲基-苯并三唑、5-甲基-苯并三唑和脱乙基-特丁苯嗪的去除率与氧化还原电位呈负相关 (|r|=0.456–0.805)。高流量事件后中位旅行时间增加,导致替米沙坦、曲马多、4-甲基-苯并三唑和去乙基特布苯嗪的去除减少 (|r|= 0.435–0.661)。泛影酸盐、碘帕醇、曲马多和苯并三唑的去除率随着距海岸的距离(148 对 395 m)的增加而增加,分别增加了 25 %、28 %、8 %、16 %。背景 地下水污染增加了农业区水井中的农药浓度 1.与河水相比,是 5-5 倍。与传统计算相比,基于模型的方法在采样活动期间为 OMP 去除效率提供了更一致的结果,并允许估计各种环境因素的影响。
更新日期:2025-01-23
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