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DOI : 10.17640/KSWST.2018.26.4.69 , Vol.26, No.4, 69 ~ 81, 2018
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| Title |
| Comparison of Different Type Coagulants for the Removal of Harmful Algae in Pilot Scale Cyclonic-DAF System |
| 오홍석 Hong-sok Oh , 강선홍 Seon-hong Kang , 양시천 Shi-chun Yang , 남숙현 Sook-hyun Nam , 김은주 Eun-ju Kim , 황태문 Tae-mun Hwang |
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| Abstract |
| Dissolved air flotation (DAF), one of the most representative physico-chemical processing technologies used to remove suspended particles or algae in aquatic environment. Cyclonic Dissolved Air Flotation (DAF), a dissolved air flotation method displaying improved performance, has a structure capable of forming twirling flows that produce microbubbles that adhere to suspended matter and float to the surface of the water passing through the float separation tank. The purpose of this study is to evaluate the cyclonic-DAF process for the treatment of harmful algae in aquatic environment. The effect of coagulants type, such as PAC, PolyDADMAC and R-119, were investigated. In this experiments, algaecide named as R-119 showed the effective coagulant to remove chlorophyll-a and algae. For the effect of the coagulant dose, the removal efficiency of algae was increased as coagulant concentration increased. The optimal concentration coagulant has been similarly observed at 60 mg/L for PAC and R-119. However, PAC showed that it did not meet the number of cyanobacteria cells below the algae level suggested by the algae warning guideline. In the case of PolyDADMAC, the removal of cyanobacteria cells showed excellent results, but turbidity and suspended solids were significantly lower than that of PAC and R-119. |
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| Key Words |
| Algae removal, Coagulant, Cyanobacteria, Cyclonic-DAF |
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