= + + = =

This section has focussed on CMAS design as a means for presenting the basic factors that must be considered in the design of any activated sludge system. Like CMAS, EAAS usually has both the biomass and the oxygen requirement distributed uniformly throughout the bioreactor. Consequently, the design procedure for an

EAAS system is essentially the same. The only difference is that due to the long SRTs typically used with the EAAS process, floe shear is not usually a factor limiting the bioreactor size. Rather, the major issue is to maintain MLSS in suspension in an economical manner.