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Long-term production of bioethanol in repeated-batch fermentation of microalgal biomass using immobilized Saccharomyces cerevisiae

Title
Long-term production of bioethanol in repeated-batch fermentation of microalgal biomass using immobilized Saccharomyces cerevisiae
Author
전병훈
Keywords
Microalgae; Saccharification; Repeated batch fermentation; Bioethanol; Immobilized yeast; Energy recovery
Issue Date
2016-11
Publisher
ELSEVIER SCI LTD
Citation
BIORESOURCE TECHNOLOGY, v. 219, Page. 98-105
Abstract
Separate hydrolysis fermentation (SHF) and simultaneous saccharification fermentation (SSF) processes were studied for bioethanol production from microalgal biomass. SSF was selected as an efficient process to enhance the bioethanol yield through repeated-batches using immobilized yeast cells. Combined sonication and enzymatic hydrolysis of Chlamydomonas mexicana generated 10.5 and 8.48 g/L of ethanol in SSF and SHF, respectively. Yeast utilized maximum portion of total reducing sugar (TRS) reaching a consumption efficiency of 91-98%. A bioethanol yield of 0.5 g/g (88.2% of theoretical yield) and volumetric productivity of 0.22 g/L/h was obtained after 48 h of SSF. Immobilized yeast cells enabled repetitive production of ethanol for 7 cycles displaying a fermentation efficiency up to 79% for five consecutive cycles. The maximum ethanol production was 9.7 g/L in 2nd-4th cycles. A total energy recovery of 85.81% was achieved from microalgal biomass in the form of bioethanol. Repeated-batch SSF demonstrated the possibility of cost-effective bioethanol production. (C) 2016 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0960852416310926?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/101347
ISSN
0960-8524; 1873-2976
DOI
10.1016/j.biortech.2016.07.113
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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