Yucel, YasinGoycincik, Sezer2024-09-182024-09-1820152190-68152190-6823https://doi.org/10.1007/s13399-014-0138-2https://hdl.handle.net/20.500.12483/12340The aim of this study was to investigate the prospect for the use of spent tea waste (STW), an important municipal waste, as a potential substrate to generate hydroly-sates for fuel ethanol production. Acid pretreated STW was used as substrate for ethanol production. The critical variables that affected ethanol fermentation from STW were identified by Plackett-Burman designs and further optimized by using a five-level-three-factor central composite design of response surface methodology. The optimum conditions for ethanol fermentation were determined to be NH4Cl concentration of 2.7 g/L, yeast concentration of 11.7 g/L, and temperature of 42.8 degrees C. Maximum concentration of reducing sugar and ethanol under the optimum conditions were 28.90 g reducing sugar/L and 12.72 g EtOH/L, respectively. Predicted ethanol concentration was obtained using quadratic polynomial equation. The predicted ethanol concentration was 13.38 g EtOH/L in the optimal conditions. Validity of the predicted model was confirmed using verification experiment (12.72 g EtOH/L).eninfo:eu-repo/semantics/closedAccessSpent tea wasteEthanolFermentationPlackett-Burman designCentral composite designArticle5324725510.1007/s13399-014-0138-22-s2.0-84978022745Q2WOS:000219116500002N/A