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KMID : 0382420000260020059
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Korean Journal of Environmental Health Society
2000 Volume.26 No. 2 p.59 ~ p.66
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Effects of PCO2 on Methane Production Rate and Matter Degradation in Anaerobic Digestion
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Lee Kook-Eui
Suh Myung-Gyo
Kim Young-Chur
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Abstract
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Effects of carbon dioxide partial pressure(PCO_2) on bacterial population, methane production rate and matter degradation in anaerobic digestion were investigated by using anaerobic chemostat type reactors at 35±1℃, at the HRT of 7 days. At PCO_2 of 0.5 atm, the specific methane production rate and specific substrate removal rate reached the maximum rates. The methane production rates in the reactors fed by mixed substrate were 26% higher than those obtained under the controlled condition. The number of acetate consuming methanogenic bacteria enumerated by the MPN(most probable number) method, decreased when PCO_2 exceeded 0.7 atm. Hydrogen consuming methanogenic bacteria and homoacetogenic bacteria increased as PCO_2 increased from 0.1 to 0.6 atm, however, decreased slightly at PCO_2 above 0.7 atm. The number of hydrolytic bacteria, sulfate-reducing bacteria and H_2-producing acetogenic bacteria were not much influenced by the change of PCO_2. The potential methanogenic activity reached the maximum at PCO_2 0.5 atm, however, decreased significantly when PCO_2 exceeded 0.7 atm, It was considered that the inhibition of specific methane production rate at PCO_2 above 0.7 atm would depend on free CO_2 concentration in solution.
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