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http://dx.doi.org/10.11001/jksww.2022.36.6.391

Design and application of a high-rate dissolved air floatation process in a drinking water treatment plant: A field study for turbidity and algae removal  

Hyun Je Oh (School of Civil and Environmental Engineering, University of Science and Technology)
Publication Information
Journal of Korean Society of Water and Wastewater / v.36, no.6, 2022 , pp. 391-402 More about this Journal
Abstract
A high-rate dissolved air flotation (DAF) process, with a surface loading rate of 20-40 m3/m2/h, was introduced at the Y-Drinking Water Treatment Plant in South Korea. First, the DAF and granular activated carbon (GAC) processes were combined in the reactor, and the pilot plant was operated at 500 m3/day. The results from these tests demonstrated that there were significant decreases in turbidity, algae, geosmin, and 2-methylisoborneol (2-MIB) following implementation of the two processes. Then, the optimum design factors were used and the DAF system was introduced at the field-scaled plant (5,000 m3/day). The removal rate of algae and turbidity was evaluated over 56 days in summer. The number of algae in the treated water was maintained at below 20-30 cells/mL, which represented an algae removal efficiency of 80-89%. The effluent turbidity was compared to the conventional sedimentation and DAF processes, and the average turbidity removal efficiency was 77%. These findings indicate that the high-rate DAF process is a promising method for the removal of low-density solids such as turbidity and algae during the treatment of drinking water, especially in summer. Additionally, GAC represents an acceptable treatment option to remove taste-and-odor-causing compounds (e.g., geosmin and 2-MIB).
Keywords
Algae removal; Dissolved air flotation (DAF); Drinking water treatment plant; Granular activated carbon (GAC); Taste-and-odor-causing compounds;
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