嫌気性消化に及ぼすCO_2の分圧の影響
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Effect of CO2 partial pressure on the anaerobic digestion of starch and production of methane were investigated by using anaerobic chemostat type reactor at 35°C. The CO2 partial pressure in the atmosphere of the reactors was controlled in a series of bioreactor from 0.1 to 0.8atm. Since the partial pressure of CO2 in an uncontrolled condition was about 0.4atm, N2 was added to the reactors controlled at CO2 partial pressure of between 0.1 and 0.4atm. At CO2 partial pressure of 0.5atm, the methane production was approximately 20% more than that in an uncontrolled condition of CO2. Based on the carbon mass balance, it was concluded that methane production was related to the removal of dissolved organic carbon and consumption of CO2. The number of acetate consuming methanogenic bacteria, enumerated by the most probable number method, decreased significantly when CO2 partial pressure exceeded 0.7atm. Homoacetogenic bacteria were increased with increasing CO2 partial pressure increased from 0.1 to 0.6atm, however, decreased slightly at CO2 partial pressure above 0.6atm. The number of acidogenic, H2 consuming methanogenic bacteria, propionate and butyrate degraders were not much influenced by the partial pressure of CO2. The potential methanogenic activity and potential substrate utilizing activity of acetate, increased at CO2 partial pressure between 0.5atm and 0.6atm, however, decreased significantly when CO2 partial pressure exceeded 0.7atm.
- 社団法人 日本水環境学会の論文
- 1996-06-10
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