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The Wat-IF impact forecast calculator helps wastewater utilities to assess the benefits and climate impact of various treatment optimisation strategies. Wat-IF calculates the benefits resulting from the implementation of sensor technologies in wastewater processes using a utility’s own characteristics. In the first version of this calculation tool, users provide the volume of wastewater of their utility (in terms of cubic metres per day or as per-capita equivalents) and, if available, information on influent nutrient and BOD levels. If these figures are not available, general default values can be used. Next, four different scenarios are compared:

  1. current situation, no changes
  2. current situation + active sludge treatment optimisation using oxygen, nitrate and ammonia sensors
  3. current situation + additional (4th) treatment step to remove organic micropollutants using powdered active carbon
  4. current situation + active sludge treatment optimisation using oxygen, nitrate and ammonia sensors + additional (4th) treatment step to remove organic micropollutants using powdered active carbon

Benefits are expressed as:

  • improved water quality
  • cost-savings
  • reduction in carbon footprint
  • reduced ecotoxicity
  • reduction in energy-consumption or chemicals dosing

These indicators allow the user to make a thorough assessment of the impact of various activities, thereby taking into account not only improved water quality and cost savings, but also climate impact. The outcomes can be used when preparing a business case for optimisation processes.

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