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KMID : 0386819930030010067
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Journal of the Institute of Health Environmental Sciences
1993 Volume.3 No. 1 p.67 ~ p.79
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An Experimental Study on the Treatment Efficiency of Vertical Slow Filtration and Horizontal Slow Filtration by Depths of Sand Layer
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Abstract
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The purpose of this study was to establish acceptable criteria for the design of the vertical slow sand filtration and the horizontal slow sand filtration as units in rural area.
The treatment efficiencies between vertical slow sand filtration and horizontal slow sand filtration under various conditions were investigated in this study.
@ES The main results of this study were as follows:
@EN 1. There was no difference in the treatment efficiencies for consumed KMnO4, NH3-H, NO3-N, coliform and bacteria between vertical and horizontal filtrations.
2. There was no difference in the treatment efficiencies of consumed KMnO4, NH3-N, NO3-N, turbidity, coliform and bacteria between vertical and horizontal filtrations with additional chlorination.
3. The treatment efficiencies were in proved in the vertical and horizontal filtrations when chlorination was added.
4. In the vertical and horizontal filtrations with additional chlorination, the treatment efficiency reduced by depth of sand layer in order of 80cm, 60cm, 45cm, Accordingly, the depth of sand layer must be at least 60cm in simple piped water
system.
5. Operating filtration for a long time, the horizontal filtration was more economical than the vertical filtration. When backwashing was operated to remove clogging accumulated on the sand layer, the decline of filtration rate could be
prevented.
Also, operation can be done for a longer time without sand washing.
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