Abstract
Rhizopus oryzae NBRC 4697 was selected from among promising candidates as a biocatalyst for biodiesel production. This microorganism was immobilized on to polyurethane foam coated with activated carbon for reuse, and, for biodiesel production. Vacuum drying of the immobilized cells was found to be more efficient than natural or freeze-drying processes. Although the immobilized cells were severely inhibited by a molar ratio of methanol to soybean oil in excess of 2.0, stepwise methanol addition (3 aliquots at 24-h feeding intervals) significantly prevented methanol inhibition. A packed-bed bioreactor (PBB) containing the immobilized whole cell biocatalyst was then operated under circulating batch mode. Stepwise methanol feeding was used to mitigate methanol inhibition of the immobilized cells in the PBB. An increase in the feeding rate (circulating rate) of the reaction mixture barely affected biodiesel production, while an increase in the packing volume of the immobilized cells enhanced biodiesel production noticeably. Finally, repeated circulating batch operation of the PBB was carried out for five consecutive rounds without a noticeable decrease in the performance of the PBB for the three rounds.
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Acknowledgments
This work was supported by Gangwon-do, Korea and the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010-0025572). We greatly appreciate the support. The authors also would like to thank Pansuwan Supaporn and Young Wook Go for their technical assistance.
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Kyeong, J.S., Yeom, S.H. Preparation of immobilized whole cell biocatalyst and biodiesel production using a packed-bed bioreactor. Bioprocess Biosyst Eng 37, 2189–2198 (2014). https://doi.org/10.1007/s00449-014-1196-3
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DOI: https://doi.org/10.1007/s00449-014-1196-3