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Title: Screening of industrial wastewaters as feedstock for the microbial production of oils for biodiesel production and high-quality pigments

The production of biodiesel has notably increased over the past decade. Currently, plant oil is the main feedstock for biodiesel production, but, due to concerns related to the competition with food production, alternative oil feedstocks have to be found. Oleaginous yeasts are known to produce high amounts of lipids, but no integrated process from microbial fermentation to final biodiesel production has reached commercial realization yet due to economic constraints. Therefore, growth and lipid production of red yeast Rhodotorula glutinis was tested on low-cost substrates, namely, wastewaters from potato, fruit juice, and lettuce processing. Additionally, the production of carotenoids as high-value by-products was examined. All evaluated wastewaters met the general criteria for microbial lipid production. However, no significant increase in lipid content was observed, probably due to lack of available carbon in wastewaters from fruit juice and lettuce processing, and excess of available nitrogen in potato processing wastewater, respectively. During growth on wastewaters from fruit juice and lettuce processing the carotenoid content increased significantly in the first 48 hours. The relations between carbon content, nitrogen content, and carotenoid production need to be further assessed. For economic viability, lipid and carotenoid production needs to be increased significantly. Lastly, the screening of feedstocksmore » should be extended to other wastewaters.« less
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [2] ;  [1]
  1. Univ. Hohenheim, Stuttgart-Hohenheim (Germany)
  2. Mississippi State Univ., Starkville, MS (United States)
Publication Date:
OSTI Identifier:
1079512
Report Number(s):
GO8602530
Journal ID: ISSN 2090-1968; PII: 153410; 153410
Grant/Contract Number:
FG36-06GO86025
Type:
Accepted Manuscript
Journal Name:
Journal of Combustion
Additional Journal Information:
Journal Volume: 2012; Journal ID: ISSN 2090-1968
Publisher:
Hindawi
Research Org:
Mississippi State Univ., Starkville, MS (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS