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This study reported the viability of energy supply from the energetic conversion of biogas generated by the anaerobic co-digestion in biodigester of rural properties with different sizes of the herd. Indian model benchtop biodigesters were filled with sewage sludge (SS), cattle manure (CM) and deionized water (DW). The energy conversion calculation was based on the cumulative biogas yield (CBY), amount of cattle manure and one cubic meter equivalence of gas with electricity. In the SS co-digestion biogas production was accelerated and 25:50:25 SS:CM:DW presented higher cumulative production. Experimental data on the cumulative production of this ratio fitted to the exponential model, in which 28.15 L were obtained. The efficiency of anaerobic co-digestion of SS and CM was proved with a higher cumulative biogas production than in the single substrate digestion of SS and the single substrate digestion of CM. High immediate production was only observed with SS. There was a long lag-phase for digestion of only CM. An intermediate production profile to the previous ones was noticed when balancing the three co-digesters. The CBY was 16.56 L kg-1 , 0.48 L gTSadded-1 and 0.59 L gVSadded-1 to 25:50:25 SS:CM:DW. The implement of biodigesters in rural properties for electricity generation provided monthly 2600 kWh and economy of US$ 7669.19. It was concluded that the implantation of biodigesters with 25:50:25 SS:CM:DW to produce electric energy from biogas allows energy self-sufficiency of the property, enabling the sustainable development of the activity through the proper disposal of waste and economic gains to the producer.

The major problems of public health, environmental impact, and energy dependence due to conventional fuels can be solved by using biogas from biodigesters. Therefore, the objective of this paper was to evaluate the energy potential of using biogas in the replacement of firewood and liquefied petroleum gas (LPG). For the biogas production, Indian model batch digesters were used in a batch supply system. Those were supplied with 100: 0, 75:25, 50:50, 25:75 and 0:100 sewage sludge: cattle manure (SS:CM). The calculation of the energy conversion was based on the accumulated biogas production, biogas production potential, the amount of waste produced by dairy cattle in a rural property and the equivalence of one cubic meter of gas with wood and LPG. In general, the adoption of biodigesters in rural properties to generate biogas for thermal energy consists of a viable and sustainable technology, regardless of the number of animals in the property. The use of sewage sludge antecipated biogas production, with the highest biogas production potential being 25:75 SS:CM. The financial savings obtained by the owner and /or community when installing a biodigester can be invested in the rural property. Therefore, it is concluded that there is a feasibility to replace firewood and LPG with biogas.

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