Simulation of Simultaneous Nitrification-Denitrification using Activated Sludge Model No. 1

B.S. Magbanua Jr., A. Dey, C.K. Monwuba, J.L. Hillabrand, and O. Barnes (USA)


Simulation, Waste Processing, Wastewater Treatment, Biological Nitrogen Removal


The operation of biological wastewater treatment systems performing simultaneous nitrification-denitrification (SND) was simulated using Activated Sludge Model No. 1 (ASM1). Properties and parameters typical of domestic sewage were used in the simulations. System performance was simulated under a range of conditions to identify an appropriate operating window for the process. Simulation results indicated optimum nitrogen removal was achieved when the dissolved oxygen concentration was 0.3 mg/L and the solids residence time was 15 d. The availability of electron donor to drive denitrification was also a major determinant of overall nitrogen removal. The effect of other operating parameters, however, was minimal. Comparison of simulation results with reported field and laboratory data indicated that the simulations underpredicted nitrogen removal, suggesting that ASM1 could reproduce general trends in SND performance, but would require parameter estimates better suited to SND operation in order to accurately predict nitrogen removal.

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