ISSN: 1659-2751

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Potential of Tropical Agricultural Substrates for Biogas Production at Different Temperatures of Anaerobic Digestion

Abstract

The use of anaerobic digestion for CH4 production is a low cost technology, whose by-products (biogas and fertilizer) have important benefits. Moreover, it can be very useful and economically feasible for developing countries. The objective of this work was to assess the potential of different agricultural substrates, vegetative as well as animals, for the production of biogas, through the use anaerobic digestion methods at different temperatures. The substrates analyzed were corn straw, sugar cane bagasse, swine manure, and cattle manure, at three anaerobic digestion temperatures: 30 °C, 35 °C and 40 °C. The total solid (TS) and volatile solids (VS) of the substrates were analyzed in the laboratory and the substrates contained between 12 % (cattle manure) and 38 % (sugar cane bagasse) TS and over 80 % VS in all the substrates. The CH4 production increased with respect to an increase in temperature. The swine manure demonstrated the greatest potential for biogas production at a temperature of 35 °C, while the cattle manure presented the least potential for biogas production at all temperatures tested.

Key words: sugarcane bagasse, corn straw, swine manure, cattle manure, methane, temperature.

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