Abstract :
Acidogenesis process is first step in aerobics digestion process. Acidogenesis process produce
volatile fatty acid (VFA) as a substract in methanogenesis process to produce biogas. This
research imed to obtain eddect of agitation also obtain the best agitation of the semi batch
reactor in acidogenesis process of palm oil ,mill effluen (POME) at temperature 550C.
Operation was done of the semi batch reactor by varying th agitation 200 rpm, 250 rpm, and
300 rpm with pH 5,5 ± 0,2. Analysis for solids (TS, VS, TSS, and VSS), COD and VFA during
acidogenesis.