# Wastewater Treatment

## Ahmed Mezaal

### PhD-I Project

### 2015-2016

### Abstract

We analyse the steady-state operation of a continuous flow bioreactor for the
two models. In chapter 2 we investigate a simple model for the wastewater
treatment, in which the reaction is assumed to be governed by the Monod
growth kinetics. The steady-state solutions are found and their stability
determined as a function of residence time. The performance of the bioreactor
at large residence times is obtained. Knowledge of the steady-state solutions
and their asymptotic limits may be useful to estimate parameter values from
the experimental data.

In chapter 3 we investigate an extension of the basic model for the activated
sludge process. The steady-state solutions are found and their stability
determined as a function of residence time. We use steady-state analysis to
investigate how the amount of sludge formed depends upon the residence
time and the use of a settling unit. We show that when the steady-state
sludge content is plotted as a function of the residence time that there are
three generic response diagrams, depending upon the value of the effective
recycle parameter. Knowledge of the steady-state solutions and their
asymptotic limits may be useful to estimate parameter values from the
experimental
data.

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Page Created: 10th September 2016.

Last Updated: 10th September 2016.