Simulação estacionária e dinâmica do reator anaeróbio horizontal de leito fixo para o tratamento de águas residuárias.

Abstract

This work studied the horizontal-flow anaerobic immobilized biomass (HAIB) for the treatment of wastewater, developed in the Department of Hydraulics and Sanitation of the School of Engineering of São Carlos - USP. For the simulation and modeling of RAHLF, data of two HAIB were used, and; when the regime is the dynamic, one in bench scale treating wastewater containing poisonous substances (BTEX) and when the regime is the stationary, other in pilot scale treating sewer sanitarium. The study was divided in two parts: stationary regime and transient regime. In the first case the models were analyzed: pseudo - homogeneous with and without axial dispersion and the heterogeneous with axial dispersion; in the second case, the models were analyzed: pseudo - homogeneous and heterogeneous. The models of the first case were resolved respectively for the numeric methods of Runge - Kutta, of the finite differences and of the orthogonal collocation. In those models, when if it despised the axial dispersion the kinetic constant of first order was adjusted. Already in the other two models acted in this same case, they were adjusted the kinetic constant of first order and the coefficient of axial dispersion simultaneously. All of the methods numeric employees in the first case described the tendency of variation of the concentration well along the reactor and inside the particle, making possible the convergence of the solutions. The models without axial dispersion foresaw concentration values in the exit closest of the experimental values than the models with dispersion, and this, for his/her time foresaw closer values to the experimental ones in the intermediate points. In the second case, the models were solved through two methods, the method of the finite differences and the method of the sequence. The methods got to solve the equations that describe the behavior of the reactor satisfactorily and they show that the answer of the exit in the reactor is appropriately made calculations.