Modeling and parametric study of the activated sludge process at Doha Treatment Plant

For the secondary treatment stage of Doha Municipal Wastewater Treatment Plant, the activated sludge process was represented hy mass balance relationships for substrate and micro-organisms. The substrate utilisation rate was assumed to follow the Monod model. Kinetic coefficients were determined using steady and unsteady-state analyses. The non-linear governing equations in the unsteady-state analysis were solved using the fourth order Rung-Kutta method. The steady-state approach was observed to give better results. For the final settling tank, a performance equation was obtained for the determination of the suspended solids in the effluent.