Implementation, study and calibration of a modified ASM2d for the simulation of SBR processes

An enhanced process model for SBRs has been developed. Though the basic mec hanism largely draws on the Activated Sludge Model n. 2d, its new features are the splitting of the nitrification stage in a two-step process, accordi ng to the well known Nitrosomonas -Nitrobacter oxidation sequence, and an i mproved X-PAO dynamics. involved in the anaerobic/aerobic phosphorus remova l process. The model was implemented through the DLL technique allowing complied C++ m odules to be linked to an ordinary Simulink block diagram. The static sensi tivity study revealed that ii the parameter vector is partitioned into subs ets of biologically related parameters and calibrated separately, the calib ration procedure does not present particularly difficult aspects. Trajector y sensitivity showed also to which extent data collection could be optimise d in order to improve calibration accuracy. The study of the shape of the error functional generated by parameters coup les allows a much more effective calibration strategy.