Biogas generation from anaerobic digestion of residues from the insect cultivation diet
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Abstract
The exponential growth of solid waste generation has become a worrying factor around the world, due to the negative impacts caused to fauna, flora and public health when inappropriately disposed. An alternative for treating organic waste is anaerobic digestion, which generates biogas that can be reused for electricity and fuel, also reducing the mass of waste to be disposed of. This study aimed to evaluate the potential for biogas generation of an organic waste, generated from diets from the cultivation of organisms for integrated pest management, composed of whole wheat flour and brewer's yeast, in addition to quantifying the generation of biogas. The potential for methane generation, using AME – Specific Methanogenic Activity. The tests were conducted in two stages and the AME test values found in the first stage ranged between 0.025 and 0.180 gCOD CH4/gSSV.d and substrate degradability was 90.64%. For the second stage the values were between 0.004 and 0.041 gCOD CH4/gSSV.d and maximum degradability of the residue was 65.75%. The theoretical volume of methane generated in CNTP with 100% substrate degradation (L CH4) was 0.786L in the first stage and 0.943L in the second stage. The volumes of methane generated in the tests were 0.789L and 0.804L in the first stage and 0.700L and 0.482L in the second stage. Thus, it is concluded that this residue has the potential for biogas generation and the methane production was within the expected range in the literature.
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References
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