Lipid Production by Rhodotorula glutinis from Pulp and Paper Wastewater for Biodiesel Production

Marta Amirsadeghi¹, Sara Shields-Menard², W. Todd French^1*, Rafael Hernandez³

¹Dave C. Swalm School of Chemical Engineering, Mississippi State University, Starkville, Mississippi, USA.
²Department of Biological Science, Mississippi State University, Starkville, Mississippi, USA.
³College of Engineering, University of Louisiana at Lafayette, Lafayette, Louisiana, USA.

DOI: 10.4236/jsbs.2015.53011                

Abstract

This study investigated the potential of oleaginous yeast Rhodotorula glutinis utilizing pulp and paper wastewater effluents as cultivation media for the sustainable production of microbial lipids as biodiesel feedstock. R. glutinis is oleaginous yeast, which has the ability to produce significant quantities of intercellular lipids in the form of triacylglycerols. Yeast lipids are a promising potential feedstock for biodiesel production due to similar fatty acid composition to plant oils. The effect of various carbon sources on biomass production, lipid accumulation, substrate utilization, and fatty acid composition using R. glutinis in the pulp and paper wastewater media was studied. The pulp and paper wastewater was supplemented with glucose, xylose, and glycerol as carbon sources under nitrogen-limited conditions. The maximum lipid productions of 1.3 - 2.9 g•L^–1, which corresponded to the intracellular lipid contents of 8% - 15% cell dry weight (CDW), were obtained under various carbon substrates. A kinetic study of the batch fermentation was performed in a 3 L aerobic batch fermenter to describe the cell growth, lipid accumulation, and substrate utilization process, and the kinetic parameter was estimated. The fatty acid profile of oleaginous yeast was rich in palmitic, oleic, and linoleic acids and comparable to vegetable oils. Thus, the results of this study indicated that pulp and paper wastewater could be used to produce lipids as biodiesel feedstock.

Keywords

Biofuels, Lipid Production, Biodiesel Feedstock, Rhodotorula glutinis, Pulp and Paper Wastewater

Conflicts of Interest

The authors declare no conflicts of interest.

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