서울市 水道水中 大腸菌群 調査硏究 = A Microbiological Study of the Tap Water in Seoul

다국어 초록 (Multilingual Abstract)

The demand of water is rapidly increasing with the growth of population in Seoul area. The city government has recently devoted itself to the quantitative production of water without overall supply system planning. Dirty water might leak in the pipe and contaminate the supply water because more than 40 years old pipes are still using by connecting with new pipes, numerous private water companies are continuously installing distribution systems at-.individual houses, and the supply is intermittent in some areas. A survey was undertaken to find out the pollution status of supply, mainly, by leakage of pipes.
Coliform groups by the membrane filter technic and residual chlorine were examined with 93 samples of tap water collected in whole Seoul areas from June 29 to September 26, 1970, and following results were obtained:
1. Do residual chlorine was found at 24(26%) out of 93 samples, while 49 samples(53%) contained 0. 1 to 0. 5 ppm, 17(18%), 0.6 to 1. 0 ppm, and 3(3%), 1. 1 to 1. 5 ppm. At Mapo-ku, 6 out of 11 samples have no residual chlorine and 4 out of 10 have no at Sudaemoon-ku.
2. coliform groups were found at 13(14%) out of 93 samples when 100 ml tap waters were tested by the membrane filter technic and other microorganisms at 6(6%). Coliforms were detected at 4 out of 11 samples in Sungbuk-ku, 3 out of 11 in Dongdaemoon-ku, 1 out of 5 at Yungdungpo-ku while no coliforms were detected from 12 samples at Yongsan-ku.
3. coliform groups positives were 4(17%) out of 24 samples with no residual chlorine, 8(16%) out of 49 with 0.1 to 0.5 ppm, 1 out of 17 with 0.6 to 1.0 ppm and none out of 3 with 1.1 to 1.5 ppm.