Characterization of organic precursors in DBP formation and AOC in urban surface water and their fate during managed aquifer recharge. (15th October 2017)

• Record Type: Journal Article
• Authors: Kim, Hyun-Chul; Lee, Won Mo; Lee, Seunghak; Choi, Jaewon; Maeng, Sung Kyu
• Is Part Of: Water research. Volume 123(2017)
• Page Start: 75
• Page End: 85
• Publication Date: 2017-10-15
• Subjects: Assimilable organic carbon -- Disinfection byproduct formation potential -- Managed aquifer recharge -- Trace organic chemicals; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2017.06.038
• Languages: English
• ISSNs: 0043-1354

Abstract

Abstract: 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-O3 mg-C −1 ) 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. Graphical abstract: Image 1 Highlights: Hybrid managed aquifer recharge (O3, bank filtration and artificial recharge recovery). Selected hybrid managed aquifer recharge systems were effective for AOC removal. O3 -arquifer recharge recovery attenuated the formation of disinfection byproducts. The removal of organic acids decreased in disinfection byproducts formation.