Análise do aproveitamento energético do biogás obtido na biodigestão anaeróbia de manipueira em uma farinheira de mandioca

Abstract

The State of Paraná has the 2nd biggest production of cassava in the national ranking (Brazil), concentrated in the regions of Umuarama, Paranavaí, Toledo and Campo Mourão. In the production process of Flour factory there are several stages that generates different effluents, and one of them is cassava wastewater, resulting from the pressing of the grated mass of cassava. The cassava wastewater is a highly toxic effluent and must receive a previous treatment before final destination. As an alternative, anaerobic biodigestion can be used in biodigestors, which treat the effluent and generate biogas as a byproduct, the biogas can be burned in boilers. Thus, the purpose of this work was to analyze the energy usage of the biogas obtained by anaerobic biodigestion in a biodigestor fed by a Flour factory. This study was fulfilled through laboratory analyzes, on-site visits and bibliographical research. The result obtained for the amount of biogas generated monthly was 28.920,68 m³ and the equivalent emissions of CH4 and CO2 avoided, due to the biogas burning in the company's boiler were 723,017 m³/day and 15,183,357 m³/day, respectively. The company obtained savings of 52% with purchase of firewood after using the energy of the biogas in the boiler. With this, it can be concluded that the energy usage of the biogas from the boiler is advantageous for the owner of the company, because he can obtain savings with the purchase of firewood, environmental gains due to not launching untreated effluent in the water and avoided gases emissions.