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Diatoms have appeared in high numbers from winter to spring and have caused obstacles in the water treatment process. Especially Seynedra of needle shape has increased the clogging of the filtration-basin. When Synedra sp. increases, most of the WTP remove that by enhancing an oxidation, coagulation and sedimentation process such as addition of polyamine. The purpose of this study is that installing DAF in filtration-basin and analyzing the effect of DAF. Applying DAF to the filtration-basin increased the turbidity removal rate to 59% and improved by 25% than general filtration-basin. It was also found that the higher the turbidity flowed in, the better the removal efficient of turbidity. The Synedra sp. removal efficiency of the DAF filtration-basin was 97% and most of the Synedra sp. could be removed by floating. The filtration time of DAF filtration-basin was 183 hours, which was 72% higher than that of general filtration-basin.

A Study on Removal of Synedra sp. by using DAF System in Filtration-Basin