The utilization of acid-tolerant bacteria on ethanol Production from kitchen garbage

In order to achieve ethanol production from kitchen garbage under non-sterilized fermentation, the acid-tolerant Zymomonas mobilis named GZNS1 was selected and applied in the fermentation system. Ethanol production from kitchen garbage under non-sterilized fermentation with GZNS1 was proved to be feasible. The utilization of control strain and acid-tolerant strain under different conditions demonstrated that the sequence of ethanol yield was followed: sterilized garbage with control strain inoculated under pH of 6 (52 g/L) approximate to sterilized garbage with GZNS1 inoculated under pH of 4 (48 g/L) > non-sterilized garbage with GZNS1 inoculated under pH of 4 (46 g/L). Furthermore, the distillery waste during fermentation was adopted to recycle fermentation and acquired 50 g/L ethanol, higher than those adjusted with tap water. The utilization of acid-tolerant bacteria combing with the utilization of distillery waste associated with the process can increase ethanol production, save energy and reduce the cost of ethanol production. (c) 2008 Elsevier Ltd. All rights reserved.