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The effects of the ratio of effective size of filter media and diatom size on filter run time were evaluated by using both reported data and experimental results from several water treatment plants. For single media at several WTPs. the range of probability of the filter run time less than 15hr is 10~60%. and for dual media, that of the filter run time less than 30hr was 10~20%. The major filter clogging algae was Synedra acus of which dominant ratio was in the range of 64~92%. The effective size(ES) of filter medium for dual media filter was 0.71~1.40 ㎜ and uniformity coefficient of the filter was 1.25~1.67. The effective size(ES) of filter medium for single medium filter was 0.52~0.65 rom and uniformity coefficient of the filter was 0.25~1.40. The range of calculated penetration depth was 2.58~15.4 ㎝ for dual media and 1.29~2.17 em for single media, and average filter run time was 40.1~83.3 hr and 13.9~34.9 hr, respectively. When Synedra counts were over 400 cells/ml for single media, filter run time was below 5 hr, while filter run time for dual media filter, remained as high as 70hr.

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Abstract

1. 서론

2. 실험재료 및 방법

3. 실험결과 및 고찰

4. 결론

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UCI(KEPA) : I410-ECN-0101-2009-532-017810633