The DeAmmon^® nitrogen removal process is specially developed for high nitrogen concentration wastewater, such as the rejected water from digestion, and nitrogen-rich industrial wastewater. Compared to conventional nitrogen removal processes, the great advantage of DeAmmon^® is the significantly lower oxygen consumption, and no need for external organic carbon. This process can easily be retrofitted into existing treatment plants.

DeAmmon^® Features and Benefits:
- Low operation cost
- No addition of external carbon source, such as methanol or ethanol
- Reliable performance
- 80% removal of nitrogen
- Low sludge production

Reject water from digestion

The one-stage DeAmmon^® plant is easy to operation and offers excellent process stability.

The Purac one-stage DeAmmon^® technology is quite suitable for wastewater with high nitrogen concentration, up to 1500mg/l NH4-N, and low C/N ration. In a one-stage DeAmmon^® plant, the anammox organisms grow on the surface of plastic carriers that are overgrow by biofilm containing the nitrification organisms. The nitrogen rich influent is intermittently aerated in treatment tanks with suspending carriers. This process is very stable to variations in influent flow and nitrogen content, and it has the ability to convert 90% of the ammonia to nitrogen gas.

In a wastewater plant the carbon is preferably utilized to produce methane rich biogas while the nitrogen is converted to nitrogen gas. During digestion lots of organic bound nitrogen is released, ending up in the reject water. Reject water is re-circulated back to the influent contributes to an internal nitrogen load. Every treatment plant with wise process planning will benefit from treating it’s rejected water stream with the DeAmmon^® process, in order to use carbon and nitrogen in the best and most cost-effective way.