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The results of biomethanization process are biogas and slurry. The process of forming conventional biogas with cow feces input has a hydraulic retention time (HRT) of 30 days. In this study, an innovation was carried out by adding new bioactivator with the aim decomposition on input occur optimally and quickly. HRT of one week was showed good and stable gas production than controls. It is assumed that if the gas has stabilized, the slurry has undergone decomposition in which the slurry is a liquid fertilizer ready to use. The study design was a completely randomized design with three treatments as follows: (1) T1: control without an additional bioactivator; (2) T2: addition of biactivator 1%; and (3) T3: addition of bioactivator 2%. Bioactivator was made from waste bananas, papayas and pineapples with an additional of chicken intestines. Addition of chicken intestine was done because the bacteria in the chicken intestine are known very effective at work. The parameters measured were pH, C-Organic, N-Total, P2O5 and K2O. The results showed that T3 had characteristics as slurries which awee better than T2 or T1. This means that an additional of bioactivators cause good slurry quality even though HRT is only 1 week.

The effect of bioctivator addition to the quality of bio gas slurry