Desenvolvimento de um sistema de secagem para sangue bovino proveniente de abatedouros.

Abstract

Nowadays, with more than seven billion inhabitants living in the planet it is necessary to revise concepts to improve efficiency in the mechanisms of food production within the food chain and avoid high costs of wastewater treatment and high concentrations of organic matter. A significant example is the case of animals’ slaughterhouses, especially the bovine, that shed the blood into water bodies causing environmental pollution. To minimize these effects, an automated spray drying system was developed for animal protein production making use of the bovine blood. The automatic drying system, built with materials of cost low and acquisition easy in modules with a possibility of changes in layout, points out water evaporation capacity of 2.6 kg.h-1 and operation ease. Preliminary runs provided information to operate the main causes of low efficiency in the process of spray drying process. With the adopted actions satisfactory results were obtained for the project proposes. The main results were a blood powder with a particle size suitable for reconstitution, good fluidity and storage conditions for the product preserving its color without petrifying it. The blood powder with moisture content on a wet basis of 4.7% has a production efficiency of 67% and a powder collection efficiency of 77%. The main controlled variable was the output temperature through the suspension flow rate manipulation, which has a direct influence on the moisture content of the obtained powder.