Abstract:
This paper summarizes the development of activated sludge mathematical models for wastewater treatment process since 1950s,and presents the characteristics and restrictions of activated sludge models No.1,2,2D and 3(ASM1,ASM2,ASM2D,ASM3) recommended by IWA(International Water Association).Some typical types of commercial simulation softwares based on ASM are described.Finally,three key issues concerning the application of ASM models,i.e.water quality analysis,model simplification and parameters calibration are discussed.