[Organic acids conversion in methanogenic-phase reactor of the two-phase anaerobic process].
Experiments on organic acids conversion in methanogenic-phase of the two-phase anaerobic process were conducted. The results showed that when the acidogenic-phase was in mixed acids fermentation and its load was 41.5 kg/(m3-d), the load of methanogenic-phase was 6.05 kg/(m3.d), the substrate conversion velocity of bacteria inhabited at the same height of UASB reactor as follows: acetic acid > ethanol > butyric acid > propionic acid; ethanol-utilized microbial had the same pH range as methanogenic bacteria; ethanol-type fermentation was the optimal acidogenci-type fermentation for the two-phase anaerobic process; the conversion of acetic acid was rather high, but the others organic acids will be convert to acetic acid make it the rate-limiting step for anaerobic degradation.
Ren
Nanqi
N
Research Center of Environmental Biotechnology, Harbin Inst. of Tech., Harbin 150090, China.
Liu
Min
M
Wang
Aijie
A
Ding
Jie
J
Li
Hongmin
H
D019342:Acetic Acid / Q000378:metabolism; D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D020148:Butyric Acid / Q000378:metabolism; D005285:Fermentation; D008697:Methane / Q000378:metabolism*; D011422:Propionates / Q000378:metabolism; D018508:Water Purification
D011422:Propionates; D020148:Butyric Acid; C029658:propionic acid; D008697:Methane; D019342:Acetic Acid