Optimization of culture conditions for production of yeast biomass using bamboo wastewater by response surface methodology.

Response surface methodology (RSM) was applied to optimize culture conditions for the growth of Candida utilis with bamboo wastewater. A significant influence of initial pH, fermentation time and yeast extract on biomass of C. utilis was evaluated by Plackett-Burman design (PBD). These factors were further optimized using a central composite design (CCD) and RSM. A combination of initial pH 6.1, fermentation time 69 h and yeast extract 1.17 g/L was optimum for maximum biomass of C. utilis. A 1.7-fold enhancement of biomass of C. utilis was gained after optimization in shake-flask cultivation. The biomass of C. utilis reached 19.17 g/L in 3 L fermentor.