Journal
BIORESOURCE TECHNOLOGY
Volume 194, Issue -, Pages 179-186Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.07.021
Keywords
Wet microalgae; Biodiesel; Microwave disruption; Oil extraction; Direct transesterification
Funding
- Ministry of Science and Technology, Taiwan [MOST 104-3113-E-006-003, MOST 103-2221-E-006-190-MY3]
- Top University Grants for National Cheng Kung University
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Although producing biodiesel from microalgae seems promising, there is still a lack of technology for the quick and cost-effective conversion of biodiesel from wet microalgae. This study was aimed to develop a novel microalgal biodiesel producing method, consisting of an open system of microwave disruption, partial dewatering (via combination of methanol treatment and low-speed centrifugation), oil extraction, and transesterification without the pre-removal of the co-solvent, using Chlamydomonas sp. JSC4 with 68.7 wt% water content as the feedstock. Direct transesterification with the disrupted wet microalgae was also conducted. The biomass content of the wet microalgae increased to 56.6 and 60.5 wt%, respectively, after microwave disruption and partial dewatering. About 96.2% oil recovery was achieved under the conditions of: extraction temperature, 45 degrees C; hexane/methanol ratio, 3: 1; extraction time, 80 min. Transesterification of the extracted oil reached 97.2% conversion within 15 min at 45 degrees C and 6: 1 solvent/methanol ratio with simultaneous Chlorophyll removal during the process. Nearly 100% biodiesel conversion was also obtained while conducting direct transesterification of the disrupted oil-bearing microalgal biomass. (C) 2015 Elsevier Ltd. All rights reserved.
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