Avaliação do emprego de coagulantes orgânico e inorgânico no tratamento primário de efluente de abate e industrialização de aves

Abstract

The agroindustries use a large amount of water in their process and as a consequence, generate a large volume of industrial liquid effluents, the treatment of these effluents is by physical-chemical and biological treatment. This work has the objective of evaluating the use of organic and inorganic coagulants in the primary treatment of slaughter effluent and the industrialization of birds associated to the sedimentation process, as well as the characterization of the effluent. Magnafloc LT 7990 and PAC coagulants were studied, using the methodology of experimental planning and optimization of processes, using as independent variables the concentration of coagulants and flocculants, with turbidity removal as response variable. Initially, the sedimentation factorial 22 was designed to adjust the application ranges, followed by a central rotational compound design – DCCR aiming at the optimization of the sedimentation processes. With coagulant PAC a sedimentation turbidity removal of up to 98.64% was obtained, with 390 ppm of coagulant and 6 ppm of flocculant. With the coagulant with organic base Magnafloc LT 7990, the efficiency for sedimentation reached up to 97.73% with 78 ppm of coagulant and 8 ppm of flocculant. It was demonstrated in this work that the inorganic coagulant PAC presented better turbidity removal, as well as better cost-benefit, but additional studies must be done for the sludge generated due to the metal ion retention. It has also been shown that, while maintaining the use of the organic coagulant Magnafloc LT 7990, there is a possibility of reducing the concentration of the coagulant used and, consequently, the cost around 10%.