Modelling and test of aeration tank settling (ATS)

The use of aeration tank settling during high hydraulic loads on large wast ewater treatment plants has previously been demonstrated as a reliable tech nique and proven valuable. The paper proposes a simplified deterministic mo del to predict the efficiency of the method. It is shown that a qualitative ly correct model can be established. The simplicity of the model allows for on-line identification of the necessary parameters, so that no maintenance is needed to use of the on-line model for control. The practical implementation on three plants indicates that implementation of STAR with ATS control gives 50% increase of plant capacity for 3% extra cost.