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KMID : 0383419680090010137
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Korean Modern Medical Journal
1968 Volume.9 No. 1 p.137 ~ p.153
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Studies on Bacterial Contamination of Sewages in the City of Taegu
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Abstract
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The author studied the bacterial -contamination of -sewages in Taegu from September 1965 to ;December 1966 for the purpose of obtaining the rate of bacterial contamination in relation to " each district, season, pH and temperature.
The results of the examination were summarized as follows:
1) The average number of the general bacterial count was approximately 200 million per ml. The most heavily contaminated area was Tong-Ku district.
2) The M.P.N. of E. coli was 5 million per 100 ml. in average.
This -is an extremely high rate in comparison with its standard number of M.P.N. in - sewage. The highest rate was observed in Suh-Ku district.
3) Salmonella species were found in 29 cases (5.13%) out of 563 samples, most of them belonging to the group D (65%).
Tong-Ku and Nam-Ku were higher in rate.
4) Shigella flexneri was found in 16 cases (2.84%) out of 563 samples. Both type 2 and 3 were found in higher" rate than other types, and type 5 was not detected at all. The highest rate was seen Nam-Ku district.
5) The relationship between the rate of bacterial contamnation and the season was as follows: Population of microorganism including E. coli and salmonella species increased in the spring, the summer and in the´ fall and decreased in the winter. On the contrary shigella increased in the winter.
6) The relationship of the contamination rate with the temperature and pH was as follows:
Population of microorganism including E. coli and salmonella increased in accordance W A the increasing degree of pH and temperature, while shigella increased in compliance´ wit the decreasing degree of pH and temperatur
7) The detection rate of Salmonella in relation with the number of bacterial population includiaE E. coli showed that the rate was high in compliance with the number of bacteria, and that in cases of shigella the same tendency was observed as in Salmonella except cold season
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KEYWORD
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