Robust State Estimation for a Nonlinear Hybrid Model of the Alternating Activated Sludge Process Using Filtered High-Gain Observers

Table 1

Parameters of the activated sludge process model.

Parameters	Values	Designation
	9.5	Dissolved oxygen saturation concentration
	225 or 0	Coefficient of oxygen transfer
	62.59	Heterotrophic biomass growth rate
	187.37	Speed of production of nitrate by the autotrophic activity
	52.63	Speed of hydrolysis of slowly biodegradable substrate by the heterotrophic activity
	987.2	Soluble organic nitrogen ammonification
	0.2	Average saturation coefficient of oxygen for the heterotrophic biomass
	0.5	Average saturation coefficient of nitrate
	0.98	Average saturation coefficient of ammonia for the autotrophic biomass
	0.4	Average saturation coefficient of oxygen for the autotrophic biomass
	0.64	Performance coefficient of heterotrophic biomass
	0.086	Mass of nitrogen in the heterotrophic and autotrophic biomass concentration
	0.31	Hydrolysis correction factor in the anoxic phase
	1.14	The dilution rate
	0.016	The dilution rate