Otimização da produção de biogás utilizando aquecimento e agitação com automação de biodigestores

Abstract

The growing development of the country has led to the search for new alternatives of energy sources, being important the conscious use of the existing energy sources. Improving existing studies and projects in the energy area can contribute significantly to the growth of energy production, and biogas is a product with great potential for expansion and can be used to generate energy. By means of the evaluation of three models of biodigesters, we tried to qualify the best model for future installations. The biodigestors studied were the circular model of complete mixing with agitation, air injection, heating of the waste and kept at constant temperature; the rectangular Canadian model with stirring of the waste by recirculation pump and the rectangular Canadian model without heating and stirring. The parameters evaluated were the biogas production rate, pH, COD, Total Solids, Fixed Solids, Volatile Solids, Acidity and Alkalinity. The results show that the average biogas production was 40-75% methane (CH4), 25-50% carbon dioxide (CO2), among other components. Its composition varies according to the type of waste used to feed the biodigesters and their operation. The values found in this work indicate that it is possible to improve the constructive and operational way of the biodigesters to obtain a better biogas, by means of the standardization of the residues at the entrance of the biodigesters, observing the relation between the solid and liquid material, pH, and The sizing of the biodigester to meet the needs of each property, and the complete mixing biodigesteor provides better results.