Cultivation and lipid production of yeast Cryptococcus curvatus using pretreated waste active sludge supernatant

被引:50
作者
Seo, Yeong Hwan [1 ]
Lee, Il Gyu [1 ]
Han, Jong In [1 ]
机构
[1] Korea Adv Inst Sci & Technol, Dept Civil & Environm Engn, Taejon 305701, South Korea
关键词
Biodiesel; Cryptococcus curvatus; Sludge; Hydrodynamic cavitation; Pretreatment; MICROALGA CHLORELLA-PROTOTHECOIDES; BIODIESEL PRODUCTION; OLEAGINOUS MICROORGANISMS; HYDRODYNAMIC CAVITATION; AQUEOUS-SOLUTION; FERMENTATION; ACCUMULATION; DEGRADATION; EFFLUENTS; CULTURE;
D O I
10.1016/j.biortech.2012.10.024
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Oleaginous yeast Cryptococcus curvatus has become some of the most promising feedstock for biodiesel production due to their high production efficiency. However, high cost of cultivation, especially substrate cost, hinders rapid commercialization of yeast-based biodiesel. In this study, waste activated sludge (WAS), which is rich in nutrients and organic matters, was examined as an economic substitute for organic substances. To be efficiently bioavailable, WAS must be pretreated. Hydrodynamic cavitation reaction time and pH were identified as experimental factors, whereas growth rate was selected as response parameter. The experimental factors were optimized employing Response Surface Methodology (RSM). Growth rate of 1.13/h was optimized at reaction time 12.5 min and pH 8.65. When sludge pretreated under these optimal conditions was used as a substitute to yeast extract, 9.84 g/L of biomass was obtained in a day and lipid was accumulated up to 23% of dry weight. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:304 / 308
页数:5
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