SIMULATION OF SIMULTANEOUS NITRIFICATION-DENITRIFICATION USING ACTIVATED SLUDGE MODEL NO. 1

摘要

The operation of biological wastewater treatment systemsrnperforming simultaneous nitrification-denitrificationrn(SND) was simulated using Activated Sludge Model No.rn1 (ASM1). Properties and parameters typical of domesticrnsewage were used in the simulations. System performancernwas simulated under a range of conditions to identify anrnappropriate operating window for the process. Simulationrnresults indicated optimum nitrogen removal was achievedrnwhen the dissolved oxygen concentration was 0.3 mg/Lrnand the solids residence time was 15 d. The availability ofrnelectron donor to drive denitrification was also a majorrndeterminant of overall nitrogen removal. The effect ofrnother operating parameters, however, was minimal.rnComparison of simulation results with reported field andrnlaboratory data indicated that the simulationsrnunderpredicted nitrogen removal, suggesting that ASM1rncould reproduce general trends in SND performance, butrnwould require parameter estimates better suited to SNDrnoperation in order to accurately predict nitrogen removal.