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A treatment test o sewage of the Chung-gae stream was carried out through the activated sludge process at the laboratory through June 19 to July 27, 1967. Ammonia, nitrite and nitrate nitrogens, BOD, of the supernatant were measured after aerating two mixtures of activated sludge and Chung-gae stream sewage(500㎎/l), and of that and synthetic sewage(500㎎/l) for 15 hours. Followings are summarized results; 1. Ammonia and nitrite nitrogens are similar at the ranges of 0.7 to 1.5㎎/l and 0.0 to 0.6㎎/l respectively between Chung-gae stream sewage and synthetic sewage loaded tanks while nitrate nitrogens are 27.7 to 36.7 ㎎/l at the Chung-gae stream sewage-loaded tank and 29.8 to 46.2㎎/l at synthetic sewage-loaded tank. 2. BOD was 64㎎/l at the first day and 150㎎/l at the tenth day at the Chung-gae stream sewage-loaded tank while 32㎎/l at the first day and 40㎎/l at tenth day at the synthetic sewage one, that is, BOD removal is not occurred at the stream sewage loaded tank so well as the synthetic sewage one. 3. Activated sludge was 1,300㎎/l at the Chung-gae stream sewage loaded tank while 4,300㎎/l at the synthetic sewage loaded one at the tenth day though 2,000㎎/l activated sludge was put into each tank in the beginning.
Air pollutants were measured to get useful data in preventing and controlling the pollution at industrial, semiindustrial, commercial, park, crossroad and residential areas in Seoul from March to July, 1971. Tested. were dustfalls, suspended particulates, sulfuric anhydride, sulfur dioxide, and relation between the polloution and meteriological factors was discussed. Main findings were summarized as follows: I. the highest amount of dustfalls of 35.2 tons/km2/m was measured in April while the lowest of 27.3 in July and near crossroad areas the highest amount of dusts of 48.0 fell while the lowest of 18.9 in park areas, 2. the highest concentration of sulfuric anhydride of 2.98 mg/d/100cm2 PbO2 was detected in March while the lowest of 2.46 in June and near crossroad areas the highest of 3.28 while in residential the lowest of 1.93. 3. dusts fell more with the increase of relative humidity, the amount of cloud, precipitation and with the decrease of sunshine, but meteriological factors did not effect on the amount of sulfuric anhydride. 4. the highest amount of suspended particulates of 1.92 mg/m3 of air was detected on Sunday in residential areas while those of 2.30 near crossroad and 1.50 in industrial areas respectively on Wednesday and mean particulates for a week were 1. 92 near crossroad, 1. 15 in residential areas and 0. 96 in industrial areas. 5. on Tuesday the highest amount of sulfur dioxide of 0.090 ppm was detected while on Wednesday the highest of 0. 120 and 0. 100 near crossroad and in industrial areas respectively. 6. the highest amount of nitrogen dioxide was 1. 775 ppm on Sunday in residential areas, 1. 207 on Tuesday near crossroad and 1.775 on Monday in industrial areas. 7. high suspended particulates were detected at 7-13 o'clock (0.90 mg/m3 of air) and 19-21(1.08) in residential areas, at 5-11 (3.30) and 21-23(2.34) near crossroad, and at 5-7(2.34) and 17-19(2.46) in ` industrial areas. and daily two-peak periods concurred with those of temperature inversion of air. 8. high sulfur dioxide was detected at 3-5 o'clock(0.057 ppm) and 17-19(0.104) in residential areas, and 7-9(0.200) near crossroad, but no high peak was found in industrial areas. 9. the highest nitrogen dioxide was detected at 14 o'clock (0. 994 ppm5, at 16(1, 5625 near crossro6d, and at 12(1.775) in industrial areas.
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.