Conversion regular patterns of acetic acid, propionic acid and butyric acid in UASB reactor.
On the basis of continuous tests and batch tests, conversion regular patterns of acetate, propionate and butyrate in activated sludge at different heights of the UASB reactor were conducted. Results indicated that the conversion capacity of the microbe is decided by the substrate characteristic when sole VFA is used as the only substrate. But when mixed substrates are used, the conversion regulations would have changed accordingly. Relationships of different substrates vary according to their locations. In the whole reactor, propionate's conversion is restrained by acetate and butyrate of high concentration. On the top and at the bottom of the reactor, conversion of acetate, but butyrate, is restrained by propionate. And in the midst, acetate's conversion is accelerated by propionate while that of butyrate is restrained. It is proved, based on the analysis of specific conversion rate, that the space distribution of the microbe is the main factor that affects substrates' conversion. The ethanol-type fermentation of the acidogenic-phase is the optimal acid-type fermentation for the two-phase anaerobic process.
Liu
Min
M
School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. liumin72@sina.com
Ren
Nan-qi
NQ
Chen
Ying
Y
Zhu
Wen-fang
WF
Ding
Jie
J
D019342:Acetic Acid / Q000737:chemistry / Q000378:metabolism*; D001421:Bacteria, Anaerobic; D019149:Bioreactors; D020148:Butyric Acid / Q000737:chemistry / Q000378:metabolism*; D005285:Fermentation; D011422:Propionates / Q000737:chemistry / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology
D011422:Propionates; D012722:Sewage; D020148:Butyric Acid; C029658:propionic acid; D019342:Acetic Acid