plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111elSSN : 2287-8815
Optimal Treatment Conditions for Sea-RAS Wastewater Using OrganicPolymer Flocculants and Ozone
운성천1·박정환2*
1서울대학교 블루카본사업단, 2School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University
This study investigated the optimal conditions for treating RAS (recirculating aquaculture system) wastewater using a polyacrylamide (PAM) and ozone oxidation. Drum screen filter backwash water was treated with PAM (1-30 μL g TSS-1), filtered through a geotextile filter (80-100 μm), and then ozonated (18.75-300 mg O3 g TSS-1). The optimal PAM dosage was determined to be 2 μL g TSS-1, as it increased the median particle diameter beyond the filter pore size (> 100 μm), ensuring effective turbidity removal. In the subsequent ozonation process, low doses (18.75-37.5 mg O3 g TSS-1) maintained stable water quality with effective nitrite control. However, excessive ozonation (300 mg O3 g TSS-1) caused floc disintegration and organic solubilization, leading to drastic increases in turbidity and total organic carbon. Therefore, a combined process using 2 μL g TSS-1 of PAM followed by controlled ozonation (18.75-37.5 mg O3 g TSS-1) is recommended to maximize physical filtration efficiency while preventing secondary water quality deterioration.
Recirculating aquaculture system (RAS), Wastewater, Flocculant, Ozonation, Water quality