Conversion regular patterns of acetic acid,propionic acid and butyric acid in UASB reactor

Abstract： 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 microbial 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. 作 者： LIU Min    REN Nan-qi    CHEN Ying    ZHU Wen-fang    DING Jie   作者單位： LIU Min,REN Nan-qi,ZHU Wen-fang,DING Jie(School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China)

CHEN Ying(College of Environmental & Energy Engineering, Beijing University of Technology, Beijing 100022, China) 

期 刊： 環境科學學報(英文版)  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(3)  分類號： X703  Keywords： conversion regular pattern    VFAs    specific conversion rate    UASB reactor