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Environmental Engineering Research 2001;6(2): 99-108.
CHARACTERISTICS OF TEMPERATURE CHANGE ON THE SUBSTRATE DEGRADATION AND BACTERIAL POPULATION IN ONE-PHASE AND TWO-PHASE ANAEROBIC DIGESTION
Gi-Cheol Cha1, Hyung-Keun Chung1, and Dong-Jin Kim2
1Department of Environmental Engineering, Yonsei University, Wonju 220-710, Korea
2Department of Environmental Science, Hallym University, Chunchon 200-702, Korea
Corresponding Author: Gi-Cheol Cha ,Tel: +82-33-760-2450, Fax: +82-33-763-5224, Email: gccha@dragon.yonsei.ac.kr
Received: February 23, 2001;  Accepted: May 22, 2001.
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ABSTRACT
The effects of rapid temperature change on the characteristics of substrate degradation and bacterial population in one-phase and two-phase anaerobic digestion processes were investigated using anaerobic chemostat-type reactors fed with soluble starch as a substrate. The digesters had been maintained more than 6 months at 30 °C prior to changing to 20 °C, and the temperature was decreased to 20 °C over 8 hours after a steady state conditions and thereafter maintained at 20 °C. The degradation efficiencies of the substrate decreased by approximately 4% after 5 days in one-phase anaerobic digester and approximately 20% after 7 days in the acidogenic phase of two-phase anaerobic digester, but no significant impact was observed in the methanogenic phase. The change in temperature did not have a significant impact on the bacterial population levels in one-phase anaerobic digester. In two-phase anaerobic digester, however, the number of acetate-utilizing methanogenic bacteria significantly decreased, but no impact was observed on acidogenic bacteria and H2-utilizing methanogenic bacteria.
Keywords: acidogenesis | anaerobic reactor | bacterial population | methanogenesis | rapid temperature change
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