| Title |
Escherichia coli Survival in River Waters and Sediments |
| Authors |
김치경 ; 김근식 ( Chi Kyung Kim ; Keun Sik Kim ) |
| Abstract |
The survival of E.Coli was studied by an in situ method in water column, sediment, and water-sediment interface in Moosimcheon River waters. Their survival rates were analyzed in terms of ecological correlations with water temperature, water quality, and indigenous predators. E. coli survived longer in water-sediment interface than in water column, and shorter than in sediment. The survival rates increased in any samples as the water temperature decreased, while the difference of the rates in water column and sediment decreased in the colder season. In the samples of the more polluted waters, the organisms survived longer. The difference of the rates in water column and sediment was greater in the less polluted waters than in more polluted. The total numbers of indigenous predators were found to be about 1 log higher in sediment than in water column. But after 14 days of in situ experiment, the number in the dialysis sac changed to be 1 log higher in sediment than in water sample. The fact that the survival rates of E. coli in water-sediment interface were always higher than those in water column, and lower than those in sediment, without regard to water temperature, water quality and heterotrophic activity of E. coli in the waters. But the amount of sediment materials resuspending into the water column was found to be one of the most important factors for survival of E. coli in the river waters. |