SASSPro V2 ™ is a powerful activated sludge process simulator – optimized for:
  • plant design evaluations,
  • plant process optimization
  • operations staff training
  • wastewater research
  • classroom teaching purposes.
  • Ideal for Circuit Riders
SASSPro V2 is the latest release of the popular SASSPro series, used by leading
engineering firms, municipal authorities, environmental agencies and training
organizations. SASSPro V2′s design, ease of use and low cost sets a new benchmark in wastewater process software.



  • With over 120 activated sludge process outputs, built-in operational calculations, standard plant metrics (loadings, efficiencies, removals, PE etc), and automatic unit conversions, SASSPro V2 is unmatched as a powerful wastewater process calculator.
  • Live reactor status reports facilitate study of biological processes within individual reactor zones of the activated sludge process, and provide instant feedback for optimization of process parameters such as flows, reactor volumes, and RBCOD, nitrate, phosphorus, oxygen, nitrification and denitrification levels.


  • Built-in Wizards for fast setup; Using the Quick Start Wizard, you simply select a process configuration and type in the influent characteristics to create a default simulation. The QuickDesign Wizard lets you create a plant from basic design criteria in 5 easy steps. The QuickCal Wizard assesses your plant settings and prioritizes inputs requiring actual plant data for optimum results.


  • A single keypress provides instant Sensitivity Plots for any process input. Process outputs can also be optimized for key operating variables e.g. effluent concentrations can be plotted versus reactor recycle flows and influent concentrations to investigate optimal values and sensitivities.
  • MultiSim mode lets you store and plot monthly simulations of your plant operation. Each simulation over a 12 month period independently records seasonal loadings and plant configuration changes, allowing annual comparisons against any process output.


  • Primary Settler, VFA enhancement and Carbon Dosing options add flexibility for plant augmentation and contingency handling studies.


  • Built-in Clarifier simulator (with both Vesilind and Takacs models) can be used as a standalone module or in-line with the activated sludge process outputs to study secondary settler optimization, operational characteristics, wasting and recycle flows.


  • Diagnostic Test module provides flexibility for operational, design and regulatory tests on plant processes and outputs.


  • The SASSPro design emphasis is on ease of use, productivity and simplicity for routine PC users – without need for the extensive training or mathematical knowledge often required by users of training and modeling software. Included also, are snapshot saves, instant hint bar, glossary, context sensitive help, a user logbook for record keeping, and optional on-line troubleshooting and data analysis.


  • SASSPro is based on latest wastewater research and design recommendations for Biological Nutrient Removal (BNR) and Enhanced Biological Phosphorus Removal (EBPR) activated sludge processes.