Abstract
The energy needs in Indonesia are mainly fulfilled by fossil fuels based energy. Since there is the rise of fuel price, Indonesia government considers seeking alternative energies from renewable resources. Biogas becomes one of the alternative energy that supplies energy needs and manages cow manure waste in Indonesia. To increase adoption of biogas technology, biogas production through methane enrichment is required. The experiment was conducted with return sludge system. These instruments consist of a series portable bio-digester, gas holder and return sludge unit. There were three treatments on biogas production without and with sludge addition or re-use bio-digester sludge that produced after biogas production as raw material for next biogas production. Biogas that produced was observed every two days during 40 days. The results showed that the addition of bio-digester sludge increased biogas production and methane concentration. The optimum retention time of biogas production with sludge addition was 20 days with accumulation biogas volume of 156.38 liters or increased of 38.75 from biogas production without bio-digester sludge). The optimum retention time to increase methane level was 15 days with methane enrichment from 0.8% to 29.41%.
Highlights
52% of national energy needs in Indonesia are supplied from fossil fuels based energy
Biogas contains methane (CH4), a flammable gas that produced from fermentation of organic matter by anaerobic bacteria [2].Methane can be used as fuel because its calorific value is high about 4800-6700 kcal/m3
Today bio-digester sludge is only used as fertilizer [10], so further investigation on the utilization bio-digester sludge as addition raw material in biogas production are needed
Summary
52% of national energy needs in Indonesia are supplied from fossil fuels based energy. In 2006, subsidy for fulfilling fossil fuels based energy in Indonesia reached 60.6 million with 40% of imported energy. In November 2006, the price of fossil fuels based energy reached US$ 72/barrel. Even it was higher in the end of April 2008 of US$ 119/barrel. We assumed that the decomposition of livestock waste is non complete. It means there are some organic materials that have been not decomposed during biogas production. We proved that the return sludge system in biogas production was able to increase biogas volume and CH4 concentration
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
