A cinética de digestão aeróbica de lodo ativado.

Abstract

This paper is about the Kinetics of aerobic digestion of activated sludge. It was developed to determine the aerobic digestion constant, bh of Marais and Ekama's Kinetic model for the temperature range between 21 and 289C and to verify its applicability, to activated sludge systems. The behaviour of batches of active sludge maintained in an aerobic environment, was observed at bench scale. In all cases the sludge submitted to aerobic digestion was obtained from excess sludge of activated sludge processes of aerated lagoons, operated under different conditions. It was verified that aerobic digestion can adequately be described as a first order process with respect to the active sludge concentration. The Kinetic constant of aerobic digestion depends only on the operational system temperature. Aerobic digestion is a process that develops independently of the utilization of influent organic material so that its Kinetics in an activated sludge process and in an aerobic digester are identical.