Anggraini, Theresia May An, Seongnam Chung, Jaeshik Kim, Eun-Ju Kwon, Man Jae Kim, Sang Hyun Lee, Seunghak 2024-01-19T08:00:20Z 2024-01-19T08:00:20Z 2024-01-18 2024-02 0043-1354 https://pubs.kist.re.kr/handle/201004/112937 Aquifer storage and recovery (ASR) is a promising water management technique in terms of quantity and quality. During ASR, iron (Fe) (hydr)oxides contained in the aquifer play a crucial role as electron acceptors in attenuating dissolved organic carbon (DOC) in recharging water through dissimilatory iron reduction (DIR). Considering the preference of electron acceptors, nitrate (NO3-), possibly coexisting with DOC as the prior electron acceptor to Fe (hydr)oxides, might influence DIR by interrupting electron transfer. However, this phenomenon is yet to be clarified. In this study, we systematically investigated the potential effect of NO3- on DOC attenuation during ASR using a series of sediment columns representing typical aquifer conditions. The results suggest that DOC attenuation could be enhanced by the presence of NO3-. Specifically, total DOC attenuation was notably higher than that from the stoichiometric calculation simply employing NO3- as the additional electron acceptor to Fe (hydr)oxides, implying a synergetic effect of NO3- in the overall reactions. Xray photoelectron spectroscopy analyzes revealed that the Fe(II) ions released from DIR transformed the Fe (hydr)oxides into a less bioavailable form, inhibiting further DIR. In the presence of NO3-, however, no aqueous Fe(II) was detected, and another form of Fe (hydr)oxide appeared on the sediment surface. This may be attributed to nitrate-dependent Fe(II) oxidation (NDFO), in which Fe(II) is (re)oxidized into Fe (hydr)oxide, which is available for the subsequent DOC attenuation. These mechanisms were supported by the dominance of DIR-relevant bacteria and the growth of NDFO-related bacteria in the presence of NO3-. English Elsevier BV Synergetic effect of nitrate on dissolved organic carbon attenuation through dissimilatory iron reduction during aquifer storage and recovery Article 10.1016/j.watres.2023.120954 1 Water Research, v.249 Water Research 249 Y scie scopus 001134904800001 2-s2.0-85179403042 Engineering, Environmental Environmental Sciences Water Resources Engineering Environmental Sciences & Ecology Water Resources Article FE(II) ADSORPTION REDUCING BACTERIA RECLAIMED WATER OXIDE MINERALS OXIDATION DENITRIFICATION HEMATITE SORPTION ACETATE ASR Aquifer storage and recovery Dissolved organic carbon attenuation Iron (hydr)oxides Dissimilatory iron reduction Nitrate-dependent iron oxidation