With the processing of cassava root, various products and by-products can be obtained, such as flour, starch, crumbs, among others, generating income for small and large industries and producers. However, during these processes, large volumes of solid and liquid waste are also generated, such as handling, which has a high polluting load and needs to undergo some treatment process, avoiding more serious environmental damage. Livestock farming, which is responsible for much of the wealth generated in Brazil, also produces significant amounts of waste, especially in feedlot systems and the milk production chain. These wastes have great energy potential that, if properly used, can generate socioeconomic and environmental benefits. Among the alternatives for the treatment and utilization of these wastes, the anaerobic codigestion process using biodigesters stands out, since, besides treating them, thus reducing the impacts caused to the environment, biogas is still obtained and biofertilizer, which can have several applications and still generate several benefits. In this context, this research aimed to evaluate the influence of different concentrations of manure mixed with manipulate on the composition of biogas and biofertilizer obtained from the anaerobic co-digestion process, using batch model digesters. The completely randomized design (DIC) with 5 treatments and 3 repetitions was used. Mass percentages (g) of manure were maintained at 10%, 15%, 20%, 25% and 30% respectively. From the study it was concluded that treatment 2 (85% manipulate + 15% manure) presented higher methane content and lower carbon dioxide content, presenting itself as the best option for biogas production. Treatment 5 (70% manipulate + 30% cattle manure) stood out with higher potassium and sodium productions in the biofertilizer. In the substrate pH evaluation, treatments 4 and 5 appear with values closer to the ideal range for the development of methanogenic bacteria. There was no statistically significant difference (P <0.05) between treatments for the biofertilizer pH variable.
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