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Korean Journal of Chemical Engineering, Vol.29, No.9, 1224-1231, 2012
Evaluation of sediments of the waste from beer fermentation broth for bioethanol production
As our previous studies showed, the waste from beer fermentation broth (WBFB) is a potential resource for bio-ethanol production. The original WBFB was superior to the supernatant in this regard. The current study investigates the potential of the WBFB sediment alone for bio-ethanol production after it has been diluted with distilled water or a chemically-defined medium. The effect of stock time on WBFB sediments for ethanol production was also studied. The fermentations were carried out using 50 ml vials placed in a bioreactor in static conditions. There was relatively little increase in ethanol production with fermentation time (up to 2 h) and stock time (up to 7 days) using 20% (v/v) sediment in distilled water which did not contain any nutrients or enzymes. A 2.09% increase in ethanol production was recorded after 2 h fermentation with 20% (v/v) WBFB sediments (1 day old) in a chemically-defined medium. The increase was 3.25% for WBFB sediments with a stock time of three days in a chemically-defined medium. The
results also showed some residual activity of starch hydrolyzing enzymes in the sediments, especially at 60 ℃. The overall results of this study revealed that the sediments alone were capable of bio-ethanol production even though they were five-fold diluted with distilled water or the chemically-defined medium.
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[Cited By]
- Khattak WA, Ul-Islam M, Park JK, Korean Journal of Chemical Engineering, 29(11), 1467, 2012
- Kang M, Kim M, Yu B, Park JK, Korean Chemical Engineering Research, 51(6), 709, 2013
- Khan S, Ul-Islam M, Khattak WA, Ullah MW, Yu B, Park JK, Korean Journal of Chemical Engineering, 32(4), 694, 2015
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