Unknown Inputs Nonlinear Observer for an Activated Sludge Process

Table 1

Nonlinear-model parameters.

Parameter	Description	Value
	Performance coefficient of heterotrophic biomass	0.67
	Nitrogen mass in heterotrophic and autotrophic biomass concentrations	0.080
	Hydrolysis in anoxic phase correction factor	0.8
	Average saturation coefficient of ammonia for autotrophic biomass	0.25
	Average saturation coefficient of nitrate	0.5
	Average saturation coefficient of oxygen for heterotrophic biomass	0.2
	Average saturation coefficient of oxygen for autotrophic biomass	0.4
	Growth rate of heterotrophic biomass	46.91
	Autotrophic speed of nitrate production	276.73
	Hydrolysis speed of slowly biodegradable substrate by the heterotrophic	87.54
	Ammonification of soluble organic nitrogen	1546.8
	Concentration of dissolved oxygen saturation	9.0