Ko, Myoung-Soo Cho, Kyungjin Jeong, Dawoon Lee, Seunghak 2024-01-20T04:34:29Z 2024-01-20T04:34:29Z 2021-09-05 2016-03 0048-9697 https://pubs.kist.re.kr/handle/201004/124321 In this study, indigenous microbes enabling Fe reduction under saline groundwater conditions were identified, and their potential contribution to Fe release from aquifer sediments during managed aquifer recharge (MAR) was evaluated. Sediment and groundwater samples were collected from a MAR feasibility test site in Korea, where adjacent river water will be injected into the confined aquifer. The residual groundwater had a high salinity over 26.0 psu, as well as strong reducing conditions (dissolved oxygen, DO < 2.0 mg/L; oxidation-reduction potential, ORP < -100mV) with high Fe2+ concentrations. The indigenous microbes that mediate the reduction of Fe-minerals in this deep saline aquifer were found to be Citrobacter sp. However, column experiments to simulate field operation scenarios indicated that additional Fe release would be limited during MAR, as the dominant microbial community in the sediment would shift from Citrobacter sp. to Pseudomonas sp. and Limnohabitans sp. as river water injection alters the pore water chemistry. (C) 2015 Elsevier B.V. All rights reserved. English ELSEVIER Identification of the microbes mediating Fe reduction in a deep saline aquifer and their influence during managed aquifer recharge Article 10.1016/j.scitotenv.2015.12.106 1 SCIENCE OF THE TOTAL ENVIRONMENT, v.545, pp.486 - 492 SCIENCE OF THE TOTAL ENVIRONMENT 545 486 492 N scie scopus 000369493000050 2-s2.0-84952803203 Environmental Sciences Environmental Sciences & Ecology Article FE(III) REDUCTION FERRIC IRON GROUNDWATER MECHANISMS MOBILIZATION OXIDATION IRON(III) REMOVAL Microbe-driven iron reduction Managed aquifer recharge (MAR) Deep saline aquifer Water quality