In recent years there have been large increases in the hydraulic loading rates used to design dissolved air flotation (DAF) facilities for drinking water applications. High rate DAF processes are now available at loading rates of 20 to 40 m3/m2·h. This research evaluated dissolved air flotation as a separation method for algae and organic compounds from water treatment plants. During the service period of 2016. 5. to 2017. 6., DAF pilot plants (500 m3/day) process has shown a constantly sound performance for the treatment of raw water, yielding a significantly low level of turbidity (DAF treated water, 0.21～1.56 NTU). As a result of analyzing the algae cell counts in the influent source, it was expressed at 100-120 cells/mL. In DAF treated water, the removal efficient of alge cell counts was found to be upto 90%. The stable turbidity and algae removal were confirmed by operating the high rate DAF process under the condition of the surface loading rate of 30 m3/m2·hr.

• 정우식(한국건설기술연구원 환경플랜트연구소) | Woosik Jung (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology (KICT))
• 안주석(한국건설기술연구원 환경플랜트연구소) | Ju-Suk An (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology (KICT))
• 송근원((주)삼진정밀) | Keun-Won Song (Environmental Plant & Energy Division, Samjin Precision Co., Ltd)
• 오현제(한국건설기술연구원 환경플랜트연구소) | Hyun-Je Oh (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology (KICT)) Corresponding author