Avaliação comparativa entre custos dos processos MBBR/IFAS e lodo ativado para o tratamento de esgoto sanitário

The Moving Bed Biofilm Reactor/Integrated Fixed Film Activated Sludge (MBBR/IFAS) process is a recent development technology that incorporates the characteristics of processes with biomass growth in suspension and attached biomass (biofilm). The control parameters are practically the same applied to the activated sludge process, saved some specifics. The principal aim this paper is presents a comparative analysis between the implantation costs of a new IFAS, high-rate, conventional and extended aeration activated sludge plant for a population of 50,000 and 500,000 inhabitants. The results indicated that according to the hypotheses assumed for the implantation of the reactors, the activated sludge process was of 36% to 100% more economical than the IFAS, depending on the organic loading rate, of the land price or of the carriers costs.