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Park, Jeonghwan,Daniels, Harry V. The Korean Society of Marine Life Science 2017 한국해양생명과학회지 Vol.2 No.2
Four chemical treatments with hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>), copper sulfate (CuSO<sub>4</sub>), potassium permanganate (KMnO<sub>4</sub>) and chlorine (Cl<sub>2</sub>) were applied to the effluent pond water of a hybrid striped bass saltwater recirculating aquaculture system to compare their oxidation power. Four chemicals were applied at concentrations of 0 (control), 1, 5, 10 and 20 mg/l. An additional concentration of 40 mg/l was included in the chlorine treatment. Water samples from four hybrid striped bass ponds were tested with KMnO<sub>4</sub> and Cl<sub>2</sub>. H<sub>2</sub>O<sub>2</sub> did not reduce any of BOD, COD and chlorophyll-a, and copper sulfate was only effective on chlorophyll-a for the effluent pond. Removal efficiencies for chlorophyll-a by copper sulfate were 19.2%, 37.5%, 54.2% and 74.1% dose-dependently. Potassium permanganate effectively removed the BOD, COD and chlorophyll-a. The COD removal rates in four fish ponds varied from 15.9% to 31.6% at the concentration of 10 mg/l. Interestingly, Cl<sub>2</sub> did not reduce the BOD and COD at all, but the BOD and COD instead increased drastically with increasing the Cl<sub>2</sub> concentration. The pond water with the highest initial BOD and COD values among the fish ponds tested increased by 350% in the BOD and 150% in the COD at 20 mg/l. Furthermore, Cl<sub>2</sub> did not significantly reduce any types of solid matter in this study, while KMnO<sub>4</sub> seemed to reduce some extent volatile dissolved solid in the fish pond.