Membrana dinâmica aplicada em biorreatores anaeróbios tratando águas residuárias domésticas concentradas

Abstract

Seeking for the sustainbility, the Anaerobic Dynamic Membrane Bioreactor (AnDMBR) can be used as option. The present work had as objective the dynamic membrane technollogy evaluation perfomance on concentrated domestic wastewaters treatment through the physical, chemichal and biological characterization, and watching the dynamic membrane formation. The research was made on the experimental station of biological treatment and sanitary sewage, owned by the State University of Paraíba, with the use of two AnMDBR’s with submerse and external membrane modules configuration and with high flux operation, both with suport membrane of 89μm. Both reactors were constituted by polychloride polyvinyl (PVC) pipes and fittings of cylindrical shape. In about a hundred operation days, analyses of pH, VFA, alkalinity, real color, total solids and fractions, total and soluble chemichal oxigen demand, carbohydrates, proteins, viscosity, particle size and zeta potential, helmint eggs and total coliforms in afluente, mixed liquor and efluente samples. It was possible to identify the dynamics membrane’s cicle of formation and dissociation, reaching the average COD removal for submerged and external membrane modules of 70,5 and 67,5% respectively. With the stable operation, the turbidity removal was about 78% for both reactors, and reaching permeate particles size with a average 1μm, resembling to the microfiltration process. As for the volatile fraction, the concetrated domestic wastewater presented 0,76±0,24 g.VTS.L-1 and final values of 0,33±,09 e 0,34±0,15 g.VTS.L-1 for the AnDMBR with submerse and external modules, respectively. The results shows that the AnDMBR is a promising technollogy for the afluent treatment, with easy operation and good physical cleaning performance, but with some mishaps to solve.