Abstract
Ethanol production from agro-waste provides an alternative energy-production system. Statistical experimental designs were used for optimization of critical nutrients and process variables for ethanol production. The critical nutrients and process variables were initially selected according to a Placket–Burman (PB) design. Selected factors (inoculum level 1–5%, pH 4.5–7, temperature 25–35°C and urea concentration 0.25–0.75g/L) were optimized by response surface methodology (RSM) based on a three-level four-factor Box–Behnken design (BBD). Under optimum conditions of inoculum level 3%, pH 5.75, temperature 30°C and urea concentration 0.50g/L maximum ethanol production obtained 13.2g/L from microwave alkali pretreated rice straw with ethanol productivity 0.33g/L/h. Under optimum conditions ethanol production studied at fermenter level and obtained ethanol concentration 19.2g/L, ethanol productivity 0.53g/L/h and ethanol yield to consumed sugar 0.50g/g. These results indicated that ethanol production can be enhanced by optimization of nutritional and process variables.
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