Water Resources Research Institute, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul, 05006, Republic of Korea.
Department of Civil and Environmental Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul, 05006, Republic of Korea.
Water Res. 2017 Oct 15;123:75-85. doi: 10.1016/j.watres.2017.06.038. Epub 2017 Jun 14.
In this study, the organic components were identified that are mainly responsible for the formation of disinfection byproducts (DBPs) and for the biostability of urban surface water. The compositional distribution of dissolved organic matter (DOM) was strongly associated with the potential for both DBP formation and bacterial growth. Further evaluation was carried out (1) to compare the potential for DBP formation upon chlorination of treated water, (2) to determine the biostability that might result from minimizing assimilable organic carbon (AOC), and (3) to use laboratory-scale soil-column experiments to compare the effects of removal of trace organic chemicals (TOrCs) between managed aquifer recharge (MAR) hybrid systems (such as bank filtration followed by artificial recharge and recovery: ARR), and ozonation followed by ARR. Our fractionation and removal methods provided useful insights into the removal of problematic organic components using MAR hybrid systems. Pretreatment with a small amount of ozone (∼0.7 mg-O mg-C) resulted in improved ARR performance, especially from removing organic acids from DOM, which substantially decreased the potential for DBP formation, while the robust removal of AOC was attributed to a significant decrease in non-acidic and more hydrophilic fractions during soil passage. Both pretreatments used in this study were effective in the removal of selected TOrCs, but carbamazepine was persistent during soil passage. The pretreatment, which used ozonation before ARR, significantly enhanced the removal of carbamazepine; therefore, ozonation followed by ARR is considered an effective way to enhance removal of persistent compounds.
在这项研究中，确定了主要负责形成消毒副产物（DBPs）和城市地表水生物稳定性的有机成分。溶解有机物（DOM）的组成分布与形成 DBP 和细菌生长的潜力密切相关。进一步进行了评估（1）比较处理后水中氯化形成 DBPs 的潜力，（2）确定最小化可同化有机碳（AOC）可能产生的生物稳定性，以及（3）使用实验室规模的土壤柱实验来比较管理含水层补给（MAR）混合系统（例如，银行过滤后人工补给和回收：ARR）之间痕量有机化学品（TOrCs）去除的效果，与臭氧氧化后 ARR。我们的分级和去除方法为使用 MAR 混合系统去除有问题的有机成分提供了有用的见解。用少量臭氧（∼0.7 mg-O mg-C）预处理可改善 ARR 性能，特别是从 DOM 中去除有机酸，这大大降低了 DBP 形成的潜力，而 AOC 的有效去除归因于在土壤通过过程中非酸性和更亲水部分的显著减少。本研究中使用的两种预处理方法都能有效去除选定的 TOrCs，但卡马西平在土壤通过过程中仍持续存在。在 ARR 之前使用臭氧预处理的方法，显著提高了卡马西平的去除率；因此，臭氧氧化后 ARR 被认为是增强持久性化合物去除的有效方法。
