A kinetic model has been developed to predict changes with time of different parameters (COD, nitrogen, phosphorus, phytoplankton and alkalinity) in urban wastewater stored in deep (13.5 m) stabilization ponds in southeastern Spain. The effect of thermal stratification on the behaviour of the pond is represented in the model by means of two interconnected reactors, one above the other, representing the hypolimnion and the epilimnion respectively, separated by a moving thermocline. The values predicted by the model closely matched the experimental results.

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