Biodiesel production from wet microalgae feedstock using sequential wet extraction/transesterification and direct transesterification processes

Ching Lung Chen, Chien Chang Huang, Kao Chia Ho, Ping Xuan Hsiao, Meng Shan Wu, Jo Shu Chang

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

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. °C; hexane/methanol ratio, 3:1; extraction time, 80. min. Transesterification of the extracted oil reached 97.2% conversion within 15. min at 45. °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.

Original languageEnglish
Pages (from-to)179-186
Number of pages8
JournalBioresource technology
Volume194
DOIs
Publication statusPublished - 2015 Oct 1

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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