Continuous Ethanol Fermentation of Concentrated Sugar Solutions Coupled with Membrane Distillation Using a PTFE Module

概要

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Continuous ethanol fermentation of concentrated glucose and molasse solutions was coupled with membrane distillation using a PTFE ehanol stripping module. Experimental results indicated that the PTFE module can remove a high concentration of ethanol from the fermentation broth and thus maintain a low ethanol concentration in the broth, thereby alleviating the problem of product inhibition. Accordingly, the product yield and the specific ethanol production rete incresed. During the continuous fermentation runs, long-time operation using the PTFE module was found to be possible(i.e. 430h using the glucose medium and 695 h using the molasses medium) and no significant change in the ehtanol separation performance of the PTFE module observed. Although cell flocculation became undetectable when a concentrated molasses medium containing 316g/l suger solution was used, the ethanol separation performance of the ethanol stripper was not adversely affected by the presence of the free cells. This suggests that clogging of the membrane pores by cells or other particulates is not a major problem when using the PTFE module in continuous ethanol fermentation.
社団法人日本生物工学会の論文
1989-01-25