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Xu, Jingcheng; Zhang, Mengli; He, Tuo; Luo, Huijuan; Peng, Kaiming; Huang, Xiangfeng; Liu, Jia
Bioresource technology, 12/2019, Letnik: 293Journal Article
Display omitted •C. curvatus ATCC 20509 used high-concentration acetic acid as carbon source.•Addition of sawdust effectively promoted lipid spillage and reduced costs.•Cell-immobilization by sawdust relieved the inhibition caused by acetic acid.•Immobilization effectively increased the biomass and lipid production.•Both cultivation modes improved the quality of the biodiesel generated. Two de-lignified cellulose of loofah sponge and sawdust were applied in two ways to enhance the lipid production from oleaginous yeast using acetic acid. When 30 g/L of acetic acid was used as a carbon source, direct addition of de-lignified loofah sponge or sawdust increased the extracellular lipid content to 33.94% and 53.25%, respectively. The latter reduced the energy input of lipid extraction process from 0.86 to 0.57 GJ per ton of biodiesel production. To relieve the inhibition caused by 40 g/L acetic acid, immobilization of oleaginous yeast on de-lignified sawdust increased the lipid concentration and yield from 3.83 g/L, 0.18 g/g C to 7.15 g/L, 0.20 g/g C, respectively. These improvements occurred due to the cell-immobilized sawdust which play an important role in the loading of cells and adsorption of acetic acid. Immobilized cultivation also increased the fatty acid proportion of C18:1, thereby improving biodiesel performance.
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