from the distillation process after butanol fermentation, wastewaters mainly consisted of organic acids and residual sugars and with high cod (usually >20,000 mg/l) are generated. without any pretreatment and adding other nutrients (nitrogen sources and trace elements), these wastewaters were used as substrate for microbial oil production by oleaginous yeast trichosporon coremiiforme. after 5 days' lipid fermentation, all the sugars and organic acids measured were totally utilized by t. coremiiforme and a 68% of cod degradation could be obtained. the highest biomass and lipid content of t. coremiiforme on the wastewaters were 5.8 g/l and 19.1%, respectively. this work shows that t. coremiiforme is a promising strain for microbial oil production on the wastewaters after butanol fermentation. (c) 2012 elsevier ltd. all rights reserved.