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KMID : 0382420040300010007
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Korean Journal of Environmental Health Society
2004 Volume.30 No. 1 p.7 ~ p.14
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Effect of Nutrient Composition and Air Regulation on Bulking in the Activated Sludge Process
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Lee Jang-Hoon
Kwon Hyuk-Ku
Jung Joon-Oh
Kang Byung-Kon
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Abstract
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The change in filamentous bacteria appearance was observed by adjusting factors such as organic and nutrient conof centration of feed wastewater and the aeration rate in the reactor. In case that COD:N:P and DO were 100:10:1 and 6.1 mlll respectively, the mean SVI was 122 ml/g and the filaments were developed normally in flocs. For the low DO condition, however, the SVI averaged 186 m/lg and the appearance of outgrowing filaments were more frequent. When the high organic was supplied into the reactor, the average SVI was 274 m/lg and the distinct filamentous bulking was observed. Meanwhile when COD:N:P was maintained at 100:1:0.5, the SVI wa~ as low as 87 m/lg and the appearance of filament~ were minimal and the size of floes was small comparing other experimental conditions. For normal, low aeration and high organic concentration, predominant filaments in the early stage of experiments were commonly Type 021N, S. natans which were usually found in low DO condition. However, Type 041, Type 1851, Type 0961 became predominant as experiments extended. Meanwhile, in low nutrient condition, Type 0675, Type 1851, and Type 0961 were observed. The filamentous bacteria appearance for SVI＜ 150(mL/g), Type 0041, Type 0961(usually low organic in feed wastewater) were predominantly observed and SVI > 150(ml/g), S. natans and Type 02lN(usually low DO in aeration basin) was predominant.
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KEYWORD
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