INFLUÊNCIA DA RECIRCULAÇÃO NA REMOÇÃO DE POLUENTES EM SISTEMA HÍBRIDO DE WETLANDS CONSTRUÍDOS

Abstract

Access to basic sanitation is a right of every Brazilian citizen, however in surveys carried out recently showed that only 55% of the urban Brazilian population and rural have access to sewage treatment systems. Therefore, the search for technologies decentralized systems that are efficient, economically viable and environmentally sustainable, has become increasingly necessary. As a result, built-in wetland systems (WCs) has been gaining prominence as a treatment reference, for promoting harmony landscape, as well as the absence of the need to use chemical products, consisting of environments integrated by aquatic plants, microorganisms and filter media, which together with the use of recirculation (an operational modification that returns treated effluent system), has been shown to be an effective alternative to increase the removal efficiency of a series of pollutants. Thus, the present study sought to evaluate the combined use of the models kinetics (1st Order and Monod) to idealized hydrodynamic models of complete mixing (CSTR) and piston flow (PFR) in the representation of matter removal/transformation (MO) in a hybrid built wetland system with recirculation, installed in the Federal Institute of Goiás – Campus Rio Verde. Where the values ​​of coefficient of determination, by the Monod modeling showed the highest correlation of R² (0.11 and 0.06) for BOD and COD, respectively, in CSTR stream. In PFR flow, the highest correlation of R² (0.10) obtained, was given by the 1st Order kinetics and the highest correlation of R² (0.12) for COD by the kinetics of Monod. Since both kinetic-hydrodynamic models studied did not show appropriate setting values. However, Monod's kinetic modeling showed the most relevant results in both streams.