Design of wastewater treatment plants

Designing new wastewater treatment plants

Designing new wastewater treatment plants (WWTPs) entails identification and sizing of a sequence of unit processes to ensure a prescribed, effluent quality.

The availability of data is often limited to the average characteristics of the influent stream, such as flow rate and concentrations of the main components, as well as to the required concentration or load limits for the effluent. The characteristics of the influent stream may be measured on the actual wastewater or, more likely, extrapolated from experience. Often, the type of process is given or imposed but design alternatives can be evaluated.

Our WESTforDESIGN product is the ideal choice for this type of challenge. The Designer Tool that is included with it offers a range of process templates and design ‘rules’, such as ATV, which greatly simplify the design process of a WWTP based on steady-state conditions.

The added value of using WESTforDESIGN is that it allows you to evaluate the dynamic behaviour of the selected plant layout and even compare a number of candidate layouts by running dynamic simulations and computing performance indicators.


  • Fast and user-friendly design tool
  • Dynamic simulation using synthetically generated influent files
  • Use of ‘Notes’ to document the design workflow
  • Generation of customised reports