System of programs for activation analysis calculations: (SPAAC)

Steady state conditions are assumed in impulse response analysis and well explained in literature for the tracer test to realise the results, but this is not always the case when dealing with the wastewater treatment plants, where flow processes are always in unsteady state conditions. Beside stimulus response, the flow rate has to be measured at the same during experiment. Several figures were prepared to demonstrate the influence of variable flow rate, these figures are important in order to understand the changes of impulse response by variable flow rate. The unexpected change in the flow rate should be strictly observed to avoid misinterpretation the impulse response results. The base information in data treatment for variable flow analysis of impulse are presented, to assist in data treatment and to obtain more practical performance of the WSP.