Avaliação do desempenho de reatores combinados anaeróbio-aeróbio na remoção de matéria carbonácea utilizando diferentes meios suportes

Abstract

This scientific work had the objective of evaluating the performance of two combined anaerobic-aerobic fixed bed reactors (RCAALF) in the carbonaceous matter removal by treating cattle slaughterhouse wastewater. The reactors were operated with HRT of 12 h, continuous flow, submitted to 200% of inflow recirculation. For the reactor 1 (R1), polyurethane foam was used as the support medium, while for the reactor 2 (R2) the bio-carbon (product of the coconut shell) was used. Five spatial sampling profiles, on affluent and effluent samples from the reactors, were performed in the reactors to determine the physicochemical parameters: pH, liquid temperature (T), alkalinity to bicarbonate (AB), volatile acids (VA), chemical oxygen demand of raw and filtered samples), total solids (ST), total suspended solids (SST). The results indicated a better performance of reactor 1 (R1) in relation to the carbonaceous matter removal, with average efficiencies of 50% and 30% raw and filtered COD and ST and SST of 52% and 78%, respectively. In reactor 2 (R2) these same average efficiencies were 38%, 37%, 43% and 70%. In the statistical analysis, there was no significant difference in terms of the carbonaceous matter removal between the reactors with different media used to immobilize the biomass. With the results obtained, it was possible to conclude that the reactors did not present satisfactory performance in the operating conditions imposed, when compared to the legislation, being necessary more studies in different operational conditions. Therefore, further studies are required under different operating conditions.