Potential of the return sludge to increase biogas production from cow manure

Author(s): Ambar Pertiwiningruma,b, Ratih Kusuma Wardanic, Joko Wintokod, Rachmawan Budiartoe, Margaretha Arnita Wurif, and Misri Gozan
aFaculty of Animal Sciences, Universitas Gadjah Mada Yogyakarta, Indonesia
bAgrotechnology Innovation Center, Universitas Gadjah Mada Yogyakarta, Indonesia
cThe Center of Javanese Ecoregion Development, Ministry of Environment and Forestry, Yogyakarta, Indonesia
Department of Chemical Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia
eDepartment of Physic Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia
fDepartment of Environmental Engineering, Faculty of Engineering, Christian University of Surakarta, Indonesia
gDepartment of Chemical Engineering, Faculty of Engineering, Universitas Indonesia, Jakarta, Indonesia
International Journal of Smart Grid and Clean Energy, vol. 9, no. 1, January 2020: pp. 198-204
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.9.1.198-204

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%.

Keywords: Biogas, methane, portable bio-digester, retention time, return sludge
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