Tratamentos integrados em efluente metal-mecânico: precipitação química e biotratamento em reator do tipo air-lift

Abstract

ResumoOs objetivos deste trabalho foram: realizar a caracterização físico-química de um efluente metal-mecânico e efetuar o tratamento integrado (precipitação química e biotratamento), utilizando micro-organismos autóctones do efluente (FI e FV) e uma referência (A. niger) AbstractThe objectives of this paper were: to perform the physical-chemical characterization of a metalworking effluent and to carry out the integrated treatment , and dissolved oxygen with 2.5 mgO 2 .L -1 . With the chemical precipitation treatment, in pH = 7.5, the reduction of all the investigated metallic ions was obtained. The color was reduced 95% after the biotreatment using the FV microorganism. The chemical oxygen demand and oil and grease reductions were more significant when using FI, which reduced the same in 52 and 62%, respectively. These results indicated that the autochthonous microorganisms were more efficient in the effluent treatment than the reference organism A. niger.