마이크로버블 오존 고도산화를 이용한 축산폐수 혐기소화 배출수의 COD와 색도의 제거 = Removal of COD and Color from Anaerobic Digestion Effluent of Livestock Wastewater by Advanced Oxidation Using Microbubbled Ozone

다국어 초록 (Multilingual Abstract)

Ozone-based advanced oxidation was applied for the treatment of anaerobic digestion effluent of livestock wastewater. Initial COD and color value were 930 mg/L and 0.04, respectively, and the 1/10-diluted wastewater was used for the study. The treatment characteristics were compared between the conventionally generated ozone (105 μm) and microbubbled ozone (13 μm). The use of microbubbled ozone improved the removal of chemical oxygen demand (COD) and color by 85% and 26%, respectively, compared with the conventionally bubbled ozone. The application of microbubbled O3/UV, O3/H2O2, O3/UV/H2O2 combinations resulted in 5~10% higher color removal than ozone alone, which implies that the contribution of UV or H2O2 is not significant in color removal. On the other hand, COD removal could be increased two folds compared with ozone alone through O3/UV/H2O2 combination. The contribution of H2O2 was bigger than UV for COD removal with microbubbled ozone. Due to the enhancement of dissolved ozone and radical activity, the microbubbling enabled us to additional COD removal even after stopping ozone supply in the presence of UV or H2O2.

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