Kinetic study on the effect of temperature on biogas production using a lab scale batch reactor

• Biogas production from food waste through anaerobic digestion was carried out in a 2 l laboratory-scale batch reactor operating at different temperatures.
• The experimental results based on different operating temperatures were shown in this paper and best operating temperature has optimized.
• The kinetic study using modified Gompertz model and Logistic model were evaluated using nonlinear least-square regression analysis with the help of MATLAB® (R2012a)
• Biogas yield potential of the substrate, the maximum biogas production rate and the duration of lag phase were determined from the kinetic study.
• Coefficient of determination and root mean square values was determined using statistical analysis.
• Graph between experimental and kinetic study were drawn for both modified Gompertz model and Logistic model and their root mean square errors were found.

In the present study, biogas production from food waste through anaerobic digestion was carried out in a 2 l laboratory-scale batch reactor operating at different temperatures with a hydraulic retention time of 30 days. The reactors were operated with a solid concentration of 7.5% of total solids and pH 7. The food wastes used in this experiment were subjected to characterization studies before and after digestion. Modified Gompertz model and Logistic model were used for kinetic study of biogas production. The kinetic parameters, biogas yield potential of the substrate (B), the maximum biogas production rate (Rb) and the duration of lag phase (λ), coefficient of determination (R2) and root mean square error (RMSE) were estimated in each case. The effect of temperature on biogas production was evaluated experimentally and compared with the results of kinetic study. The results demonstrated that the reactor with operating temperature of 50 °C achieved maximum cumulative biogas production of 7556 ml with better biodegradation efficiency.