Volatile fatty acids derived from waste organics provide an economical carbon source for microbial lipids/biodiesel production

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Volatile fatty acids (VFAs) derived from organic waste, were used as a low cost carbon source for high bioreactor productivity and titer. A multi-stage continuous high cell density culture (MSC-HCDC) process was employed for economic assessment of microbial lipids for biodiesel production. In a simulation study we used a lipid yield of 0.3 g/g-VFAs, cell mass yield of 0.5 g/g-glucose or wood hydrolyzates, and employed process variables including lipid contents from 10-90% of cell mass, bioreactor productivity of 0.5-48 g/L/h, and plant capacity of 20 000-1 000 000 metric ton (MT)/year. A production cost of USD 1.048/kg-lipid was predicted with raw material costs of USD 0.2/kg for wood hydrolyzates and USD 0.15/kg for VFAs; 9 g/L/h bioreactor productivity; 100,000 MT/year production capacity; and 75% lipids content. The variables having the highest impact on microbial lipid production costs were the cost of VFAs and lipid yield, followed by lipid content, fermenter cost, and lipid productivity. The cost of raw materials accounted for 66.25% of total operating costs. This study shows that biodiesel from microbial lipids has the potential to become competitive with diesels from other sources.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2014-12
Language
English
Article Type
Article
Citation

BIOTECHNOLOGY JOURNAL, v.9, no.12, pp.1536 - 1546

ISSN
1860-6768
DOI
10.1002/biot.201400266
URI
http://hdl.handle.net/10203/194479
Appears in Collection
CBE-Journal Papers(저널논문)
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