Processo combinado de coagulação/floculação e eletrocoagulação no tratamento de efluente de abatedouro

Abstract

Industries in general are responsible for a good part of the water consumed and the same after being used must be treated and returned to the environment in a responsible way. Slaughterhouses in general generate an effluent of high polluting potential that needs treatment to be disposed of in the environment. The present research aimed to evaluate the treatment of effluent from a bovine slaughterhouse with coagulation/flocculation treatment with Moringa oleifera Lam as coagulant and subsequent electrocoagulation with aluminum electrodes. Different dosages of coagulant (0, 200, 500, 850, 1000,1500 mg/L), different current densities (15; 20.97; 25.51 A/m²), and different effluent pHs (5; 6, 8 and 9), with a constant electrocoagulation time of 60 min and using 2 aluminum electrodes. After the treatment, the parameters color, turbidity and absorbance (UV254nm) were analyzed. From the statistical analysis of the results, electrocoagulation alone was efficient and the optimal values obtained were pH 5, current density of 25.51 A/m². The dosages did not differ, therefore, for economic reasons, it is more interesting to apply only electrocoagulation, which obtained a turbidity removal of 99.72%, color removal of 95.83% and absorbance (UV254nm) of 94 .88%.