Process

The DEMON® process provides the maximum possible shortcut of the traditional nitrification / denitrification. DEMON® involves two process steps- the partial nitritation of ammonia and the subsequent anaerobic oxidation of the residual ammonia by nitrite to nitrogen gas. Partial nitritation requires a oxygen demand of only 40 % compared to conventional nitrification. No carbon dosage (Methanol) is required due to the autotrophic nature of the process.
The enormous impact on the consumption of resources shows the nitrogen cycle. The denitrification and nitratation not take place, the nitritation only half right. The total nitrogen removal is accomplished using only a very small amount of oxygen.
The highly specialized sludge is growing extremely slow and is very sensitive to toxic substances, especially to nitrite. This is valid particularly in the starting phase until stable conditions have adapted. At the WWTP Strass it took all in all 2,5 years until the plant reached its full capacity. For new plants we provide a large quantity of DEMON®-sludge to overcome fast the critical starting phase.
The main reason for the success of the DEMON®-process is the finely-tuned efficient process control system. The DEMON®-process is operated in a SBR system governed by 3 control mechanisms – pH, DO-control and time.
In addition to significant savings in energy and the complete abandonment of organic carbon DEMON® has another very important advantage. While other biological processes produce large quantities of carbon dioxide (> 4.7 t CO₂ / t N), the DEMON® system ties carbon dioxide (-0.4 t CO₂ / t N).

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Process