Dimensioning of a biodigester for the treatment of pig excreta

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Abstract

Obtaining biogas in rural areas from organic waste has environmental, economic and social benefits. This research was carried out in a rural community of the province of Granma, Cuba. The main scope of this research was to obtain the basic dimensions for the construction of a biodigester, from the biomass potential product of pig farming. For a total of 100 pigs, with a live weight of 50 kg, the dimensions of a fixed dome biodigester with a compensation store tank were obtained, which guarantees the processing of 225 kg×day^-1 of wastes. From the processed biomass, around 17.1 m³×day^-1 of biogas will be produced, which will be used as a substitute for electricity and firewood in cooking food. In addition, between 0.6 and 0.63 m³×day^-1 of effluents with a high content of nutrients in plant nutrition can be obtained. From the biomass processing capacity of the biodigester, it was possible to estimate that the global warming mitigation potential is approximately 56.7 t of CO₂ equivalent per year, which contributes to the reduction of greenhouse gases.