Bacteriological quality of ground water in Pusan area

부산시내 약수터의 세균학적 수질

This experiment was carried out to evaluate the sanitary quality of ground water in Pusan area(see Fig. 1). One hundred and thirty two water samples were collected from the 11 stations from October 1981 to Sept ember 1982. To evaluate the sanitary quality, coliform group, fecal coliform, viable cell count and composition of coliform group by IMViC reaction were observed. The median value of coliform group MPN of the samples were 59/100 ml in Udong and Daesindong, 68/100 ml in Suyeong, Yeonsandong and Sungjigog, 43/100 ml in Jenpodong and Mangmidong, 33/100 ml in Yeongdo and Dongrae, and 13.3/100 ml in Gammandong. Geometric mean of fecal coliform MPM was 4.1/100ml in Udong, 8.6/100 ml in Suyeong, 8.1/100 ml in Jenpodong, 6.1/100 ml in Daesindong and Dongrae, 8.7/100 ml in Yeongdo, 7.1/100 ml in Mangmidong, 6.5/100 ml in Yeonsandong, 9.1/100 ml in Sungjigog, 3.0/100 ml in Gammandong and 7.6/100 ml in Gupo. The seasonal difference of total coliform showed much more contamination in June or July when there were more climers than in December though it was caused by the rise of loafer temperature. With 50 percentile of total coliform MPN July was about 30 times higher than December for July was 163.5/100 ml and December 5.3/100 ml, Particularly, June was about 1.3 times higher than July in contamination because of a sudden increase of people using it. Composition of coliform was $7.64\%$ Escherichia coli, group, $42.86\%$ Citrobacter freundii group, $16.78\%$ Klebsiella aerogenes group and $32.72\%$ others. Plate count of samples was varied from 48 to $4.4{\times10}^2/ml$ during the study period.

부산시내에 산재하고 있는 70여개소의 약수터중 11개소를 선정하여 이들의 수질관리에 필요한 기초자료를 얻고자 1981년 10월부터 1982년 9월까지 132개 시료를 취하여 대장균군, 분편계대장균, 일반생균수 및 대장균군의 조성을 시험한 결과를 요약하면 다음과 같다. 1. 11개소의 대장균군 최확수의 중앙치는 구포가 93/100ml로 제일 높았고, 수영, 연산동, 성지곡이 68/100ml 우동과 대신동이 59/100ml, 전포동, 망미동은 43/100ml 영도, 동래가 33/100ml그리고 감만동이 13.3/100ml로 제일 낮았으며 이들 중 6개소가 50/100ml 이상이었다. 2. 분편계대장균 최확수의 중앙치는 영도가 12.1/100ml으로 제일 불결하였고, 수영을 비롯한 8개소는 9.1/100ml, 우동은 6.4/100ml이었으며 감만동이 제일 깨끗하였다. 3. IMViC 반응에 의한 대장균군의 조성은 Escherichia coli group이 $7.64\%$, Klebsiella aerogenes group이 $16.78\%$, Citrobacter freundii group이 $42.86\%$, 기타가 $32.72\%$로 나타났었다. 4. 일반생균수의 중앙치는 $48{\sim}4.4{\times10}^2/ml$의 넓은 분포로서 보사부(1963)의 수질기준에 절반 지역이 초과되었다.