Journal of Korean Society of Water and Wastewater (상하수도학회지)
- Volume 14 Issue 3
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- Pages.260-270
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- 2000
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- 1225-7672(pISSN)
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- 2287-822X(eISSN)
Characteristics of High-Rate Filtration with Filtration Aids
급속여과공정에서의 여과보조제 사용에 따른 여과특성
- Published : 2000.09.15
Abstract
The objective of this study is to evaluate the effect of filter aids in the dual-media rapid filtration. Paper-filter tests were conducted to determine the proper dosages of coagulant and filter aid, and pilot plant tests using two dual-media filter columns were performed for a variety of filtration rates. Using a filter aid (non-ionic polymer), the maximum feasible filtration rate is 480m/day, while turbidity is less than 0.3 NTU and filter run-time is about 70 hours. It is possible to increase the filtration rate up to 360 m/day for keeping the turbidity less than 0.1 NTU. Turbidity increases for the filtration rate greater than 360m/day. In general, the quality of filtered water with a filter aid is stable, while the filter maintains a sufficient filter run-time for a maximum allowable head loss. Particularly, the initial breakthrough can be effectively controlled. The use of a filter aid may be one of the methods applicable if the turbidity of filtered water is required to be improved or if the filter breakthrough limits filter run-time.
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