Abstract
This paper examines the use of the modified version of ASM model referred to as IAWQ#2B implemented in STOAT simulation package to model the performance of oxidation ditch process. STOAT is a free simulation package for comprehensive modeling and simulation of long-term treatment plants. The dynamic model was calibrated and validated using real operating data from the wastewater treatment plant. The model was able to produce good match in terms of COD, TN, MLSS concentrations, and effluent TSS without adjustment to any default model parameters apart from the wastewater treatment plant operating parameters, and the influent wastewater characteristics which were determined during the data collection campaign. Additionally, the use of chemical polishing for total phosphorus removal (TP) was reasonably predicted by the model. The model was able to identify ‘on-off aeration operation’ as the reason for ammonia spike at the WWTP.
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