Calibration of kinetic parameters in the IAWQ Activated Sludge Model: a pilot scale experience

The parameters in the mathematical simulation model for the nutrient remova l activated sludge process were calibrated by using operational performance data obtained on enhanced biological phosphorus removal activated sludge p rocesses treating urban sewage. By changing five parameters, maximum specif ic growth rate of nitrifiers, saturation constant of ammonia for nitrifiers , maximum specific hydrolysis rate under anaerobic conditions, maximum spec ific fermentation rate, and maximum specific polyphosphate accumulation rat e of polyphosphate accumulating organisms (PAOs), the process performance w as well reproduced by simulation. For the improvement of simulation, inclus ion of the formation or presence of soluble COD which is not utilized by PA Os either directly or via fermentation was proposed.