Center for Water Resource Cycle, Green City Technology Institute, Korea Institute of Science and Technology (KIST), Seoul 136-791, South Korea.
Center for Water Resource Cycle, Green City Technology Institute, Korea Institute of Science and Technology (KIST), Seoul 136-791, South Korea; Energy Environment Policy and Technology, Green School, Korea University (KU) - Korea Institute of Science and Technology (KIST), Seoul 136-701, South Korea.
Sci Total Environ. 2016 Mar 1;545-546:486-92. doi: 10.1016/j.scitotenv.2015.12.106. Epub 2016 Jan 4.
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<2.0mg/L; oxidation-reduction potential, ORP<-100 mV) with high Fe(2+) 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.
在这项研究中，确定了在地下咸水条件下实现铁还原的本土微生物，并评估了它们在含水层补给管理（MAR）过程中从含水层沉积物中释放铁的潜力。沉积物和地下水样本取自韩国的一个 MAR 可行性测试场地，那里将把毗邻的河水注入承压含水层。残留的地下水盐度超过 26.0 psu，具有强烈的还原条件（溶解氧，DO<2.0mg/L；氧化还原电位，ORP<-100 mV）和高 Fe(2+)浓度。在这个深层咸水含水层中介导铁矿物还原的本土微生物被发现是柠檬酸杆菌属。然而，为模拟现场操作场景而进行的柱实验表明，在 MAR 期间，铁的释放将受到限制，因为随着河水注入改变孔隙水化学，沉积物中的主要微生物群落将从柠檬酸杆菌属转变为假单胞菌属和 Limnohabitans 属。
