ABSTRACT
The wastewater from agro-industry treated with the biological treatment cannot produce the biogas because of its
low COD level and its low organic content. In this research, the co-digestion with decanter cake will improve
the biogas yield and biogas production of wastewater. The effect of three parameters (i.e., type of wastewater,
mixing and mesophilic temperature) will be evaluated in batch digesters under anaerobic condition. Moreover,
the study determines the biogas production potential of several mixtures and that of wastewater alone. The codigestion
of decanter cake with rubber block wastewater of the R4 (wastewater 200 mL with decanter cake 8
g) produces the highest biogas yield 3,809 mL CH4/g COD removal and the percentage maximum methane
gas is 66.7%. The experimental result shows that the mixing and mesophilic temperature have no significant
effect on the biogas potential production. The co-digestion of decanter cake with rubber block wastewater
provides the highest biogas yield potential production in the ambient temperature. The experimental results
reveal that the decanter cake can be potential sources for biogas production.
Keywords: Decanter Cake, Anaerobic Co-Digestion, Palm Oil Mill Industry, Biogas, Wastewater