유가공 폐수의 활성슬러지 처리에서 벌킹 제어용 염소가 미생물의 유기물 분해 활성에 미치는 영향
Effect of Chlorination for Bulking Control on the Organic Removal Activity of Activated Sludge Treating Dairy Wastewater
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Abstract
Chlorination inhibition on the organic removal activity of activated sludge microorganism was investigated in this study. It is well known that chlorination improves the settleability of filamentous bulking sludge through the selective impediment of filamentous microorganisms. However, it is based on the declination of effluent water quality after actual chlorination in dairy wastewater treatment plant. In case of the activated sludge which was exposed in the suggested concentration of chlorine 7.5 mgCl2/gVSS/day for the filamentous bulking control, decrease of organic uptake rate of 4.9~24.0%, and dentrification rate of 24.8~30.3% ware shown in comparison to the control group which was not reacted with chlorine. As a result of comparing floc size of activated sludge microorganism, the average of floc diameter in the chlorine exposed group was 150 m, which displays 25% decrease compared with the control group.
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