In this work we investigate the processing of contaminated wastewaters in a biological reactor without recycle. A clear
understanding of process behaviour in the absence of recycle is required to appreciate the effect that recycle has on operating
characteristics of the process. The results presented in this work therefore provide a benchmark for such an investigation.
The biochemical processes occurring within the reactor are modelled using the activated sludge model number 1 (ASM1)
that was developed by Henze et al. [1]. This model is an internationally accepted standard for activated sludge modeling.
It describes nitrogen and chemical oxygen demand within suspended-growth treatment processes, including mechanisms
for nitrification and denitrification. The model has been found to give a good description of the activated sludge process
provided that the wastewater has been characterised in detail and is of domestic or municipal, but not industrial, in origin