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Updated: Aug 19, 2026

Genetic Engineering of an Unconventional Yeast for Renewable Biofuel and Biochemical Production
Published on: September 20, 2016
Biomass production of yeast isolate from salad oil manufacturing wastewater
Shaokui Zheng1, Min Yang, Zhifeng Yang
1School of Environment, Institute of Environmental Sciences, Beijing Normal University, Beijing 100875, China. zshaokui@yahoo.com.cn
Abstract:
Conversion of oil-rich salad oil manufacturing wastewater (SOMW) into protein source for animal feed through biomass production of yeast isolate was investigated in this study. Five species of yeasts, including Rhodotorula rubra, Candida tropicalis, C. utilis, C. boidinii, Trichosporon cutaneum, were isolated from SOMW following enrichment culture. Of them, C. utilis was chosen as the sole biomass producer in the study due to its greatest oil uptake rate, 0.96 kg oil kg(-1) biomass d(-1), and highest specific growth rate, 0.25 h(-1). The cells of C. utilis contained 26% protein, 9% crude lipid, 55% carbohydrate and balanced amino acid compositions. The initial N:C ratio in SOMW drastically influenced oil reduction efficiency, biomass production and protein content of C. utilis, and therefore a range between 1:6 and 1:8 was recommended in consideration of these three factors simultaneously.
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