IMPROVING TITRIMETRIC TECHNIQUES BY MODELLING PH CHANGE IN ACTIVATED SLUDGE SYSTEMS

A model that describes the influence of the nitrification process on pH and accounts for the action of the carbonate system is presented. The validity of the model is tested by comparison of model predictions for the important state variables with that of experimental data from a batch oxidation of ammonium nitrogen. The results are most encouraging as the dynamic hydrogen ion production rate response is mirrored by the model simulation.