Abstract
In this present study, biogas production process was investigated using four factors—three level Box-Behnken statistical experimental design under different anaerobic conditions such as pH (4–10), temperature (25–45 °C), alkalinity dose (6%–24%), and time (6–30 days) from chicken processing industry wastewater. The obtained results were analyzed by analysis of variance and the second order polynomial model was developed to study the interactive effect of process conditions on the biogas yield. Optimum conditions for maximizing the biogas yield were determined using derringer's desired function methodology and it was found to be pH of 7, temperature of 40 °C, alkalinity dose of 16%, and time of 21 days. Under optimum conditions, predicted biogas yield was found to be 905 ml with a desirability value of 0.985. Suitability of the predicted optimum conditions was validated using experimental data.
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