The Succession of Microbial Community in CSTR Hydrogen Production System

摘要

The continuous flow stirred tank reactor (CSTR) is used for the experimental device.We discuss that the succession of climax community of the ecosystem according to composition of terminal liquid products and gas products,and the effect of the change of 'causing factor'-organic loading rate(OLR) on the structure of microbial communities in the CSTR system,and the feedback regulation among the 'following factors'( pH value,ORP value) and structure of microbial community.The community succession law restricted by OLR was studied from the angle of community dynamic: when OLR increases from 14 kg/m3·d to 20 kg/m3·d,the content of ethanol and acetic acid increased to about 60% ～ 80% of total terminal liquid products;hydrogen is started to product at the 18th day and stabilized at about 5 L/d gradually ,the maximum was 6.155L/d;the pH value and ORP value are 4.0～4.3 and -370～-400mv stable respectively,which indicated that ethanol-type fermentation microbial community replaced mixed acid fermentation microbial community.