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Seasonal Variation of Cr(VI)-contaminated Groundwater Quality and the Potential for Natural Attenuation  

Chon, Chul-Min (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Ahn, Joo-Sung (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Roh, Yul (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
Rhee, Sung-Keun (School of Life Sciences, Chungbuk National University)
Seo, Hyun-Hee (Faculty of Earth Systems and Environmental Sciences, Chonnam National University)
Kim, Gue-Young (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Koh, Dong-Chan (Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources)
Son, Young-Chul (Korea Water Resources Corporation)
Kim, Ji-Wook (Korea Water Resources Corporation)
Publication Information
Economic and Environmental Geology / v.41, no.6, 2008 , pp. 645-655 More about this Journal
Abstract
The Cr(VI) concentrations at the shallow aquifer well (MPH-0-1) of the Moonpyung groundwater monitoring station were in the range of 0.5 to 3.1 mg/L exceeding 10 to 62 times the guideline for drinking-water quality, indicating continuous contamination. However, Cr was not detected at the deep bedrock well and the other subsidiary monitoring wells except for MPH-1 and 6. Cross-correlation analyses were conducted for rainfall and groundwater level time series, resulting in the mean time of recharge after precipitation events to be 5.6 days. For rainy season, the water level was raised and the Cr(VI) concentration was several times lower than that during dry season at well MPH-0-1 well. Correlation of the Cr(VI) concentration with the groundwater-level showed that the Cr(VI) reduction was closely related with the groundwater-level rise in the well. However, the groundwater level rise during high water season induced the lateral migration of the Cr(VI)-contaminated groundwater at well MPH-4. We enriched and isolated a chromium reducing bacteria, Enterobacter aerogenes, from the Cr(VI)-contaminated groundwater in the wells MPH-0-1 and MPH-1. The bacteria may play an important role for immobilizing Cr(VI) in the Cr(VI)-contaminated groundwater. Therefore, the migration of the contaminant (Cr(VI) must has been restricted because of the natural attenuation by microbial reduction of Cr(VI) in the groundwater. This research suggests that the bioremediation of the Cr(VI)-contaminated groundwater by the indigenous bacteria may be feasible in the Cr(VI) contaminated groundwater.
Keywords
groundwater contamination; hexavalent chromium; metal-reducing bacteria; natural attenuation;
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