Produção de biogás a partir de diferentes sistemas de criação de bovinocultura de leite

Abstract

Waste generated in livestock sector has been growing annually due to the breeding systems changes and modernization, allowing large herds to be kept in small areas, considering that Paraná is the second state with the largest milk production in Brazil (IPEA, 2012; EMBRAPA, 2018). Thus, this study had as objective to identify which milk cattle regime has the highest potential for biogas production: confinement (Free Stall and Compost Barn) or semiconfinement, performing the manipulation (phase separation) of the Compost Barn samples in order to identify different yields of biogas and methane. In addition to the chemical characterization of each regime, the Biochemical Methane Potential (BMP) method was used to quantify biogas yield, and gas chromatography to characterize the gas produced. Among the traditional systems studied, the Semiconfinamento system presented the best result for methane gas production, reaching a BMP of 267.00 LN CH4 kg SV-1, followed by the Free Stall system (208,00 LN CH4 kg SV-1) and finally Compost Barn (110,00 LN CH4 kg SV-1). Also, the separation of phases performed in this last mentioned system, did not present positive and viable results to be employed in a real scale biogas plant.