Biogas production from co-digestion of orange peel waste and jatropha de-oiled cake in an anaerobic batch reactor

Abstract

Anaerobic co-digestion of jatropha deoiled cake and orange peel waste for biogas production was carried out in the batch scale (500 ml serum bottle) under anaerobic condition at ambient temperature (at various mixing ratios of two substrate). The experimental data showed a maximum gas output of 1140 ml of gas production at (1:2) ratio of jatropha deoiled cake with orange peel waste obtained for a period of 17 days. The modified Gompertz equation was used to adequately describe the cumulative biogas production for this reactor. The CH₄ content was 75%, CO₂ content was 16% and CO content was 9%. The biogas production was measured by liquid displacement system on daily basis. The digested slurry can be used as a fertilizer for agricultural purpose.

Key words: Co-digestion, orange peels waste, jatropha, biomethanation, Gompertz equation.