Response of Activated Sludge Process to Stepwise Shortening of Biological Solids Retention Time
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概要
- 論文の詳細を見る
Laboratory experiments were made to examine the effects of stepwise shortening of the biological solids retention time (SRT) on microbial aspects of activated sludge growing on an artificial wastewater containing starch and peptone as carbon and nitrogen source, respecitively. SRT was controlled automatically by intermittent drawing of the mixed liquor, and was suddenly changed from 20 to 15,10 and 15 days.The value of sludge volume index (SVI) was found to increase with the shortening of the SRT. Microscopic observatons revealed that the high SVI was caused by excessive filamentous bacteria of Types 0961 and 1701 in Eikelboom's classification. Wastewater with a high C/N ratio was found to favor filamentous growth. When the content of nitrogen source was raised, filamentous growth was suppressed apparently by active nitrification accompanied by a considerable drop of the mixed liquor pH.
- 社団法人日本生物工学会の論文
- 1985-08-25
著者
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FUKUI Keisuke
Department of Mechanical and System Engineering, University of Hyogo
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MAEDA YOSHIMICHI
Department of Applied Chemistry, Himeji Institute of Technology
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Maeda Yoshimichi
Department Of Applied Chemistry Faculty Of Engineering Himeji Institute Of Technology
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Maeda Yoshimichi
Faculty Of Engineering Himeji Institute Of Technology
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HASEGAWA Susumu
Department of Digestive and Life-style Related Disease, Kagoshima University Graduate School of Medi
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Hasegawa Susumu
Department Of Chemical Engineering
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Fukui Keisuke
Department Of Chemical Engineering
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Maeda Y
Applied Chemistry Graduate School Himeji Institute Of Technology
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NAKAJIMA MASAMOTO
Department of Chemical Engineering
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Nakajima M
Kikkoman Corp. Noda‐shi
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