Positioning N2O Sensors in Wastewater Treatment Processes - Case Study

This case study was carried out at two wastewater treatment plants in the Netherlands. They are typical sites designed for full biological nitrogen removal, with nitrification and denitrification.

The Apeldoorn WWTP serves approx. 350,000 PE. Mainstream biological treatment via denitrification and nitrification takes place in 2 parallel modified University of Cape Town (mUCT) reactors with an anaerobic selector as well as anoxic and bottom aerated aerobic zones. The reactor under investigation (excl. anaerobic zones) is 18,800 m3.

The Zaandam-Oost WWTP serves approx. 200,000 PE. The biological treatment consists of an initial mUCT reactor with short retention time and a carrousel reactor consisting of 4 serial aerated channels with bottom aeration. The latter raceway reactor with a volume of 6,800 m3 is being investigated here.