Parameter Identification of an Activated Sludge Wastewater Treatment Process Based on Particle Swarm Optimization Method

Table 1

Variables’ definition.

Variable	Name	Value
	Biodegradable substrate concentration
	Nitrogen concentration as nitrate and nitrite
	Nitrogen concentration as ammonia
	Oxygen concentration
	Dilution rate of the input	1.1433
	Dilution rate of the external carbon source	0.01666
	External carbon source's concentration	16000
	Heterotrophic yield coefficient	0.64
	Mass of nitrogen in the biomass	0.086
	Oxygen saturation concentration	9.5
	Coefficient of average saturation of oxygen for the heterotrophic biomass	0.2
	Coefficient of average saturation of oxygen for the autotrophic biomass	0.4
	Coefficient of average saturation of ammonia for autotrophic biomass	0.98
	Correction factor for the hydrolysis in anoxic phase	0.31
	Coefficient of average saturation of nitrate	0.5
	Heterotrophic growth rate	62.59
	Nitrate production rate by the autotrophs	187.37
	Hydrolysis rate of the slowly biodegradable substrate by the heterotrophs	52.63
	Ammonification of the soluble nitrogen	987.2