Tratamentos de efluentes agroindustriais utilizando processos alternativos, coagulação/floculação

Abstract

The objective of this study was to evaluate the applicability and efficiency of the use of a chemical coagulant (PAC) and a natural coagulant tannin base, and the combination thereof with an anionic polymer as an aid coagulation / flocculation treatment of slaughterhouse wastewater cattle. For the tests we used the raw effluent from the red line, a refrigerator. Coagulation tests / flocculation were carried out in the jar-test aluminum polychloride (PAC - 1% v / v) and tannin Tanfloc® (0.5% w / v) varying the dosage from 10 to 300 mg.L -1. In all tests were evaluated parameters turbidity, color and UV 254nm. The obtained optimal dosages were 250, 50, 40 and 30 mg L-1to the PAC, PAC + polymer + Tanfloc Tanfloc and polymer, respectively. Among the results, the best coagulant was the one that showed higher removal efficiency in the parameters analyzed being Tanfloc with smaller dosages, with and without addition of polymer when compared to PAC coagulant. Furthermore, addition of the anionic polymer showed lesser generation of sludge.