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Enhanced butanol production by solvent tolerance Clostridium acetobutylicum SE25 from cassava flour in a fibrous bed bioreactor

Author:
Li, Han-guang, Ma, Xing-xing, Zhang, Qing-hua, Luo, Wei, Wu, Ya-qing, Li, Xun-hang
Source:
Bioresource technology 2016 v.221 pp. 412-418
ISSN:
0960-8524
Subject:
Clostridium acetobutylicum, acetone, biofilm, bioreactors, butanol, cassava flour, ethanol, ethanol fermentation, solvents
Abstract:
To enhance the butanol productivity and reduce the material cost, acetone, butanol, and ethanol fermentation by Clostridium acetobutylicum SE25 was investigated using batch, repeated-batch and continuous cultures in a fibrous bed bioreactor, where cassava flour was used as the substrate. With periodical nutrient supplementation, stable butanol production was maintained for about 360h in a 6-cycle repeated-batch fermentation with an average butanol productivity of 0.28g/L/h and butanol yield of 0.32g/g-starch. In addition, the highest butanol productivity of 0.63g/L/h and butanol yield of 0.36g/g-starch were achieved when the dilution rate were investigated in continuous production of acetone, butanol, and ethanol using a fibrous bed bioreactor, which were 231.6% and 28.6% higher than those of the free-cell fermentation. On the other hand, this study also successfully comfirmed that the biofilm can provide an effective protection for the microbial cells which are growing in stressful environment.
Agid:
5536700