In order to prevent contamination of the waters, the inorganic nitrogen compounds ammonium, nitrite, and nitrate which are contained in the wastewater are purposefully converted into elemental nitrogen (N2) at the wastewater treatment plant.
Elemental nitrogen, the main compound of the atmosphere, escapes as gas and is thus rendered harmless to the waters. In wastewater treatment, nitrogen elimination is mostly conducted biologically by means of the conventional nitrification/denitrification or deammonification processes.


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