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DOI: https://doi.org/10.4491/eer.2019.373
Impact of carbon and nitrogen on bioclogging in a sand grain managed aquifer recharge (MAR)
Heonseop Eom1, Sami Flimban1, Anup Gurung1, Heejun Suk2, Yongcheol Kim2, Yong Seong Kim3, Sokhee Jung4, and Sang-Eun Oh1
1Department of Biological Environment, Kangwon National University, Chuncheon-si, 200-701, Republic of Korea
2Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea
3Department of Regional Infrastructure Engineering, Kangwon National University, Republic of Korea
4Department of Environmental and Energy Engineering, Chonnam National University, Gwangju, Republic of Korea
Corresponding Author: Sang-Eun Oh ,Tel: +82-33-243-6449, Fax: +82-33-242-6450, Email: ohsangeun@kangwon.ac.kr
Received: September 6, 2019;  Accepted: November 3, 2019.
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ABSTRACT
Managed aquifer recharge (MAR), an intentional storage of excess water to an aquifer, is becoming a promising water resource management tool to cope with the worldwide water shortage. Bioclogging is a commonly encountered operational issue that lowers hydraulic conductivity and overall performance in MAR. The current study investigates the impact of carbon and nitrogen in recharge water on bioclogging in MAR. For this investigation, continuous-flow columns packed with sand grains were operated with influents having 0 (C1), 5 (C2), and 100 mg/L (C3) of glucose with or without introduction of nitrate. Hydraulic conductivity was analyzed to evaluate bioclogging in the systems. In C1 and C2, hydraulic conductivity was not significantly changed overall. However, hydraulic conductivity in C3 was decreased by 28.5 % after three weeks of operation, which appears to be attributed to generation of fermentation bacteria. Introduction of nitrogen to C3 led to a further decrease in hydraulic conductivity by 25.7% compared to before it was added, most likely due to stimulation of denitrifying bacteria. These findings indicate that high carbon contents and introduction of additional nitrogen in recharge water cause serious bioclogging in MAR, suggesting the necessity for controlling quality of recharge water.
Keywords: Bioclogging | Carbon | Hydraulic conductivity | Managed aquifer recharge | Nitrogen
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