Figure 29 The variation in N 2-estimate, NO 3+-estimate and the measured NH +4 -level. It was obvious that the variation in the N 2-estimate were primarily induced by the variations in the + + NH 4 measurements. This had the effect that the controller primarily controlled the NH 4 -level.
Figure 30 The normalised variation of the dissolved oxygen and the dinitrogen gas estimate.
Published on Nov 9, 2011