Identification of the microbes mediating Fe reduction in a deep saline aquifer and their influence during managed aquifer recharge

Title
Identification of the microbes mediating Fe reduction in a deep saline aquifer and their influence during managed aquifer recharge
Authors
고명수조경진정다운이승학
Keywords
Microbe-driven iron reduction; Managed aquifer recharge (MAR); Deep saline aquifer; Water quality
Issue Date
2016-03
Publisher
The Science of the total environment
Citation
VOL 545-546, 486-492
Abstract
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 26.0psu, as well as strong reducing conditions (dissolved oxygen, DO<2.0mg/L; oxidation-reduction potential, ORP<-100mV) 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.
URI
http://pubs.kist.re.kr/handle/201004/58434
ISSN
00489697
Appears in Collections:
KIST Publication > Article
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