Influence of the drying temperature of Pacú (Piaractus mesopotamicus) residues for oil obtaining ; Influência da temperatura de secagem do resíduo de Pacú (Piaractus mesopotamicus) para obtenção de óleo

The waste generated in the fish activity, have high concentrations of oil, which can be reused for biodiesel production or the development of new products for food or drugs. Drying temperature influences greatly the degradation of the oil obtained interfering with the quality of the same. Thus, the present study aimed to evaluate the pacu residue drying kinetics as well as the characterization of the oil obtained in relation to the acidity index. The residue of pacu triturated were submitted to drying in an oven with forced air circulation at temperatures of 50, 60 and 70°C until they reached a constant weight of the samples (equilibrium moisture content). Subsequently, with the dried samples was carried out extracting oil by soxhlet method, using petroleum ether as solvent and the oil obtained was analyzed in terms of acidity index of oleic acid (%).Three mathematical models were used to fit the experimental data of drying the waste, where the Page model presented the best fit to the drying curves. In the analysis of acid value, it was found that increasing the drying temperature of the residue resulted in lower levels of acidity, presenting a smaller degradation of oil, which was at a temperature of 70 °C with an acid of 18.27%. However, in accordance with current legislation, this value even is high, requiring new studies that aim conditions for drying, as well as different techniques for oil extraction, aiming for an acid value within the established standards. ; Os resíduos gerados na pesca apresentam altas concentrações de óleo, que pode ser reaproveitado para produção de biodiesel, desenvolvimento de novos produtos voltados para alimentação humana ou fármacos. A temperatura de secagem influencia significativamente na degradação do óleo obtido, interferindo na qualidade do mesmo. Diante disso, o presente estudo objetivou avaliar a cinética de secagem de resíduo de pacu, e a caracterização do óleo obtido em relação ao índice de acidez. As amostras do resíduo de pacu trituradas foram submetidas a secagem ...