ACCOUNTING FOR DIFFERENT TIME SCALES IN ACTIVATED-SLUDGE PROCESS-CONTROL

A multirate approach is presented for the integration and discrete linearization of the activated sludge dynamics, that can be readily incorporated in optimal control and uncertainty propagation algorithms. This procedure fully accounts for the existence of multiple time-scale clusters in the activated sludge process and lends itself to a computationally efficient implementation. The method is verified in a computational case study involving a reduced-order version of the IAWPRC model.