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Refuse acidogenesis and methanogenesis: effects of fermentation gases (H 2 , CO 2 , CH 4 )
Author(s) -
Kasali G. B.,
Senior E.,
WatsonCraik Irene A.
Publication year - 1990
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1111/j.1472-765x.1990.tb01276.x
Subject(s) - methanogenesis , acidogenesis , fermentation , chemistry , environmental science , carbon dioxide , environmental chemistry , methane , mineralogy , geochemistry , food science , geology , anaerobic digestion , organic chemistry
The effects of selected fermentation gases (H 2 , CO 2 , CH 4 ) on refuse acidogenesis and methanogenesis were examined with laboratory batch cultures. Although extremely limited initial stimulation of total methanogenesis resulted from H 2 supplementation, both acetogenesis and acetate methanogenesis were inhibited. A culture headspace atmosphere of 100% CO 2 effected 98% inhibition of methanogenesis and partial suppression of acetogenesis. A gas mixture of CO 2 ‐CH 4 (40: 60) also exerted inhibitory effects on methanogenesis but not acetogenesis. Conversely, 100% CH 4 did not significantly reduce methanogenesis or acetogenesis. Individual supplementation with N 2 or CO 2 in conjunction with increased culture headspace pressure (1.6 bar) approximately doubled the CH 4 volumes but volatile fatty acid pattern changes were not apparent. The possible implications of high partial pressures of gas on refuse methanogenesis are discussed.