Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Seasonal Variation of Cr(VI)-contaminated Groundwater Quality and the Potential for Natural Attenuation

6가 크롬 오염 지하수 수질의 계절변화와 자연저감 가능성

  • 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)
  • 전철민 (한국지질자원연구원 지구환경연구본부) ;
  • 안주성 (한국지질자원연구원 지구환경연구본부) ;
  • 노열 (전남대학교 자연과학대학 지구환경과학부) ;
  • 이성근 (충북대학교 자연과학대학 생명과학부) ;
  • 서현희 (전남대학교 자연과학대학 지구환경과학부) ;
  • 김구영 (한국지질자원연구원 지구환경연구본부) ;
  • 고동찬 (한국지질자원연구원 지구환경연구본부) ;
  • 손영철 (한국수자원공사) ;
  • 김지욱 (한국수자원공사)
  • Published : 2008.12.28
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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.

국가 지하수 관측망인 대전(문평)관측소 및 주변 보조관측정 지하수 수질을 6개월간 관측한 결과, 관측소 충적관정(MPH-0-1)에서 6가 크롬이 0.5-3.1 mg/L의 범위로 검출되어 수질기준의 10-62배를 초과하는 오염이 지속되고 있었다. 또한 하천 방향에 위치한 두 관정(MPH-1과 MPH-6)에서 6가 크롬이 0.1 mg/L 이하로 검출되어 미세한 오염 확산의 징후가 나타났다. 동일기간 지하수 수위 및 강우 관측자료의 시계열분석 결과 6개 관측정에서의 지하수위는 강우에 대하여 평균 5.65일 후에 최대값을 보였다. 시기별 강우/수위 변화와 6가 크롬 농도의 변화를 통하여 강우 반응에 의한 수위상승이 관측소 충적관정의 6가 크롬 농도 감소와 밀접한 관련이 있는 것으로 파악되었다. 이와 더불어 지하수 내 미생물의 종류 및 다양성을 분석하였으며, 6가 크롬으로 오염된 대전문평지역 지하수(MPH-0-1과 MPH-1 관정)에서 크롬환원 미생물인 Enterobacter aerogenes을 분리 배양하였다. 따라서 유기물, 광물 등의 토양 및 대수층 매질에 의한 6가 크롬 저감뿐만 아니라 이 토착미생물에 의한 크롬 오염 지하수의 자연저감이 실제 진행되고 있음을 확인할 수 있었다. 향후 이 미생물의 활성에 대한 심도 있는 연구를 통하여, 크롬오염 지하수의 저감 및 정화 기술의 개발과 적용에 활용할 수 있을 것으로 기대한다.

Keywords

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