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O3-STEP filter processchema


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Insufficient wastewater quality

Wastewater does not meet the required quality.

More than 50% of the Dutch surface water does not meet the set standards for the concentration of nutrients. Besides that, WWTPs very limited remove micropollutants, such as medicine and pesticides, from wastewater.


O3-STEP filter

The O3-STEP filter is a water purification concept, it combines ozone treatment with the 1-STEP® filter (a specialized activated charcoal filter). It removes floating fabric, nitrate, phosphate and micopollutants from the water.


  • Compact and robust construction.
  • Cost effective.
  • Future-proof: the effluent of the O3-STEP filter meets the future standards.
  • Combination of proven standalone techniques.
  • By using enabled ozone oxidation there is a Increase of removal efficiency and activated charcoal stand time.


  1. Topic Waste water
  2. Development state 4: Component and/or breadboard validation in laboratory environment
  3. Setting type Natural area, Lake area, Urban area
  4. Water type Effluent
  5. Project period 1-3 years

Submitted innovation Award

Water Innovation Award