Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
권호 표지

Evaluation of Bacteriological Safety in Deep Confined Aquifer

심층피압지하수에서 세균군집의 분석에 의한 분변성 오염 평가

  • 조장천 (서울대 미생물학과 및 분자미생물학연구센터) ;
  • 김상종 (서울대 미생물학과 및 분자미생물학연구센터)
  • Published : 1999.03.01
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Abstract

The study on the bacterial distribution was performed to evaluate the bacteriological safety in 4 deep confined aquifers drilled for drinking. All the investigated aquifers were oligotrophic, howevec bacterial densities and activities and the number of indicator bacteria in C-2 boreholes were much higher than those in other boreholes. Fecal pollution was observed in 3 boreholcs except C-1 borehole. The ratio of gram positive bacteria of the C-2 borehole was much lower than those 01 another boreholes. The numbers of total colifonns, fecal coliforms, and fecal Slreptococcus in the C-2 boreholes were 61, 33, 55 CFU (250 ml)$^{-1}$

세균군집의 분포에 따른 지하수의 세균학적인 안전성을 평가하기 위하여 음용을 목적으로 개발된 4곳의 관정에서 심층피압대수층의 지하수를 채수하여 물리화학적 환경요인, 세균의 분포와 활성, 지표세균의 분포 및 종속영양세균의 종조성을 조사하였다. 조사한 4개의 관정은 모두 빈영양생태계의 특징을 나타냈으나 관정 C-2는 무기이온의 농도, 유기탄소, 종속영양세균의 수 및 활성, 지표세균의 수가 다른 관정에 비해 매우 높았다. C-1을 제외한 모든 관정에서 분변성 오염이 존재하였으며 특히, 관정 C-2는 다른 관정들에 비해 그람양성 세균의 비율이 낮았으며, 총대장균군, 분변성대장균군, fecal streptococcus 가 각각 시료 250ml 에 최고 61, 33, 55 CFU로 존재하여 지표에서 분변성 오염물질이 지하수로 유입되고 있음이 확인되었다. 종속영양세균의 동정결과 55 CFU 로 존재하여 지표에서 분변성 오염물질이 지하수로 유입되고 있음이 확인되었다. 종속영양세균의 동정결과 지하수에 주로 존재하는 세균속은 Acinetobacter, Eikenella, Moraxella, Pseudomonas, Bacillus, Micrococcus 속이었다. 한편, 지하수에 일반적으로 존재하지 않는 Enterobacteriaceae 그룹과 Staphylococcus 속과 Enterococcus 속이 조사과정에서 검출됨에 따라 이들 세균이 지하수 분변성 오염 판정의 지표세균으로 사용할 수 있음이 확인되었다.

Keywords

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