Energy self-sufficient WWTP with nutrient recovery facility


  • Design & Construct (UAV-gc)
  • Combination of thermal pressure hydrolysis (LYSOTHERM®), nutrient recovery (Pearl®) and nitrogen reject water treatment (Demon®)

Technical Data

  • Centralized sludge treatment facility 12.255 ton DS/year, 300.000 p.e.
  • Production of 11 million kWh/year electricity
  • Production of 900 ton/year Crystal Green® fertilizer incl. long term off-take

System & Technologies

  • Mechanical thickening of primary and waste activated sludge's
  • WASSTRIP® phosphate stripping process
  • Sludge concentration prior to digestion with modified belt filter presses (12% DS)
  • LYSOTHERM® thermal pressure hydrolysis
  • CHP 3x500kWe / 550kWth
  • Entire Mechanical, electrical and process automation systems and installation
  • Including civil works

Special Features

  • Besides fill coverage of own energy needs, the plant produces 2 million kQh surplus of electricity annually, which is sufficient to provide 600 households with green electricity during the year

General Data

Waterboard Vallei en Veluwe, The Netherlands

December 2017

Contract value
EUR 11.2 million