여과지 표면역세척 공정의 효율개선 = Improvement of Efficiency in Surface Washing of Granular Filters

다국어 초록 (Multilingual Abstract)

Backwashing is an important process ofr the efficient operation of granular filters, and the efficiency of the surface washing among the back washing proccsses can affect the filtration rate and filter run-time. In this study, the efficiency of surface washing is evaluated using real filters for three cases: with surface washing(with and without drainage of water to the surface of filter bed) and without surface wash-ing. As a result, in the case of adoption both the drainage and surface washing, the filter of which condition is initially worse than those of the other filters shows improvement in head-loss development, filtration velocity, filter run-time, and total filtration volume. On the other hand, the conventional method of surface washing rarely has an effect on the filter washing.