Abstract
The purpose of the study was to know the effect of rumen liquid and Saccharomyces cerevisiae as fermentation activator on the quantity of produced biogas from fresh market garbage; also the quantity as well as quality of biogas, slurry and sludge resulted from semi pilot project of the biogas production, as well as the economic feasibility of the process. This 4 x 3 factorial patterns experiment was done based on completely randomized design. The first factor was dosage of rumen liquid: 2,5%, 5%, 7,5% and 10% (v/w), while the second factor was dosage of S.cerevisiae: 0 gr/kg, 2 gr/kg and 4 gr/kg of garbage. The experiment was done in triplicate. The economic feasibility of the process analyzed based on B/C ratio and BEP of the semi pilot project of the process. The result indicated that the mixture of 5% of rumen liquid and 4 gr S.serevisiae/kg of garbage provide the highest biogas production, followed by 5% of rumen liquid and 2 gr S. cerevisiae/kg of garbage, namely: 8.7 l/kg and 7.8 l/kg of garbage respectively. The biogas has good quality because it contains 60-63% of methane. Concerning its quality, the sludge produced are potential to be use as organic fertilizer. The results also indicated that the biogas production process is economically feasible.
