Recycling nutrients

Besides organic load, wastewater also contains large amounts of nutrients such as nitrogen, phosphor, magnesium, potassium and sulfur. In conventional wastewater purification plants, it takes considerable efforts to eliminate these.

The Fraunhofer Water Systems Alliance is developing and optimizing various technologies to recover and recycle these nutrients:

  • Precipitation of magnesium ammonium phosphate (MAP, struvite) and potassium salts
  • Concentration of ammonium with an ion exchanger
  • Stripping ammoniac and precipitating ammonium salts in acid flue gas scrubbers.

The potential of these methods and products as profitable alternatives to conventional fertilizer production methods is extremely high.