The Activated Sludge Model No. 2d (ASM2d) presents a model for biological p
hosphorus removal with simultaneous nitrification-denitrification in activa
ted sludge systems. ASM2d is based on ASM2 and is expanded to include the d
enitrifying activity of the phosphorus accumulating organisms (PAOs). This
extension of ASM2 allows for improved modeling of the processes, especially
with respect to the dynamics of nitrate and phosphate. (C) 1999 IAWQ Publi
shed by Elsevier Science Ltd. All rights reserved.