earticle

영어

It is very important to save and reuse the water in order to cope with the global water scarcity. Therefore, the purpose of this study was developed the treating facility using changeable filter in order to reuse the used water or rainfall runoff as the flushing water for toilet and sprinkling water for road and vegetable plants. In order to study, the laboratory scale treating facility, which was composed with the processes of coagulation, flocculation, and filtration, was made, and preliminary test were performed to evaluate the possibility to use the treating facility. The results of treating test for artificial water made by soil were summarized as follows ;
1) Porous and compressible urethane filters with 100 ppi and 400 ppi were selected and successfully used as the changeable filter.
2) As the results of the preliminary test for the artificial colloid made by soil, flow weighted average removal efficiencies of SS were 35% to 40% under the condition of filtering flux of 1500 to 3000 m3/m2/d and pressure of 1 kg/cm2. And the range of mean particle size in effluent was 10~20 μm, and about 90% of filtered solids was washed out for 30 cycles of back washing movement.
3) For the test with turbidity, average removal rate was 31% for the case of filtering only, 32% for the case of coagulant injection and filtering, and 77% for the case of coagulation, flocculation and filtration. It was evaluated that the changeable filter facility with the preceding processes of coagulation and flocculation was possible to practical use to produce recycled water.