An Analysis of Biogas Productivity with Fixed Dome Type for Supporting Household-Base Energy in Nongkojajar, East Java-Indonesia

Indonesia is a developing country endowed by various potential renewable energy resources. Among them is biogas which basically can be produced from the decomposition of biomass by the biochemical processes. Java is the most densely populated island in Indonesia and consumes almost 67% of the national energy supply. This study was carried out under supervised government and founded by IDBP (Indonesia Domestic Biogas Program) for developing sustainable rural renewable energy supply. Many in-ground type of fixed dome biogas reactors have been established in the dairy production field owned by the Cooperative (KPSP) Setia Kawan Nongkojajar, Pasuruan East Java. An individual household of cooperative member was provided by a reactor of 8 m³ of subtract. Every reactor was assembled by financial sharing mechanism between a farmer and a financial body. The main objective of the study is to determine the effectiveness of the bioreactor in biogas production for knowing the consumption and electrification in rural area community. A batched feeding mechanism was applied using a feedstock composed proportionally from cow dung and water. The reactor was optimized in order to produce sufficient biogas production in terms of its quality [methane purity] and quantity [daily volume] to meet the energy requirement in the surrounding rural area. The result shows that the optimum productivity of biogas reached if the value of TS 16.9 kg/m³, HRT in 15 day, bioreactor temperature 23 °C, volume of biogas 3.6 m³, 67.6% CH₄ and 29.4% CO₂ with 0.8 of bioreactor effectiveness.