DEMON®: new technology for nitrogen removal

With the construction of sludge dewatering installation at the sewage treatment in Apeldoorn, The Netherlands and an additional 3rd digester, an additional treatment of the residual streams is necessary. These residual streams contain high concentrations of nitrogen that must be removed. The Veluwe Water Board has commissioned the Grontmij-Logisticon Water Treatment combination to build a de-ammonification plant (Demon®) to remove nitrogen from this waste water. The water board opted for this new technique because of its robustness, low investment costs and low energy consumption.

2nd and 3rd Demon® installation

After a successful construction and start-up of the second Demon® for The Water board Stichtse Rijnlanden (HDSR) at rewage treatment location Nieuwegein (built in a combination of GMB, Grontmij and Logisticon), SNB also opted for a Demon® installation at the Moerdijk site, which the combination Grontmij, Hegeman and Logisticon realized.

Especially suitable for nitrogen-rich water flows

The Demon® process is particularly suitable for wastewater streams with a high concentration of nitrogen. The nitrogen-rich rejection water that is released during dehydration of fermented/ digested sludge is extremely suitable for treatment with Demon®. This way more biogas can be produced, also from external waste streams, without heavily burdening sewage treatment.

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