This study aimed to utilize Palm Oil Mill Effluent (POME) and preheated Empty Fruit Bunches (EFB) as a source for enhanced biogas production in Expanded Granular Sludge Bed (EGSB) Reactor. The reactor was operated continuously for 48 days with 2 days Hydraulic Retention Time (HRT), POME : EFB mixing ratios of 1 : 0 ; 0.10 ; 0.15 ; 0.20 ; operating temperature of 35 ± 20C and 55 ± 20C. The bes…