PERFORMANCE AND KINETIC STUDY OF THE ANAEROBIC CO-DIGESTION OF COCOA HUSK AND DIGESTED COW MANURE WITH HIGH ORGANIC LOADING RATE

Biogas is a clean and cheap renewable energy that can be used for generating electricity. One of the current methods applied to enhance biogas production was through anaerobic co-digestion. The current study revealed that anaerobic digestion of cow manure co-digested with cocoa husk produced higher biogas production (348.3 mL/day) than anaerobic digestion of cow manure alone (26.5 mL/day). Even if a high organic loading rate (OLR) (4.173 kg VS/m(3).day) was applied to the reactor of anaerobic co-digestion, no inhibition was found at which pH was stable at 7.08. The results suggested that high OLR and short HRT (10 days) did not inhibit biogas production.