Avaliação do índice volumétrico do lodo pós-tratamento de coagulação/floculação

Abstract

Pork meat stands out as the main source of animal protein consumed in the world, with this the swine sector has a fundamental role in economic development, on the other hand, generates large amounts of waste, which can cause pollution of the receiving bodies. Therefore, efficient handling is necessary so that there is no contamination in the disposal of waste. In this work, the sludge volumetric index was evaluated using the coagulation / flocculation process after treatment by anaerobic digestion, with different concentrations of tannin and organic polymer. The sample was collected in the region of Vera-MT in two different periods, rain (January / 17) and dry (June / 17), after biodigestion process in the accumulation pond. Before and after each test, color and turbidity concentrations were measured, evaluating their removal with different dosages of coagulant and flocculant and also, evaluating the sludge volumetric index (IVL), based on the total solids and dry mass of the sludge. For the apparent color removals that reached approximately 100% for the two evaluated seasons, the best coagulant dosage was 1.0 g.L-1 for the rainy season and 1.25 g.L-1 for the dry season. The turbidity removals that came close to 100% for both rain and dry periods, the best coagulant dosage was 1.0 g.L-1 for rain and 1.5 g.L-1 for the dry season. For IVL the higher the coagulant dosage the lower the IVL for the rainy season, for the dry season there was no significant difference, and for both periods the flocculant is not significant.