How is nitrogen removed?

How is nitrogen removed?

The excess ofnitrogen can be eliminated biologically by adapting the treatment plant to incorporate a nitrification/denitrification process. Through this process, thenitrogen ammoniacal contained in the waste water is transformed in two stages into nitrogen gaseous.

What is the benefit of Denitrifying?

This reaction is very important in ecology, because it partially controls the nitrogen cycle and certain processes of eutrophication and/or acidification of fresh waters. These bacteria also play a major role in the field of wastewater treatment, particularly in the natural lagoon.

How to remove nitrogen from wastewater?

Nitrogen removal is one of the essential steps in wastewater treatment. Moreover, there are regulatory standards related to nitrogen concentrations at the outlet of the station in many countries. To respect these concentrations, it is necessary to control nitrification and denitrification in an optimal way.

What are the different types of nitrogen in waters?

In water, nitrogen can be found in mineral (ammoniacal, nitrate) or organic form. The presence of organic or ammoniacal nitrogen leads to oxygen consumption in the natural environment and alters living conditions.

What is the form of nitrogen?

The measurement of all forms is total nitrogen. It is the most widespread form of ammoniacal nitrogen (NH4-H). Indeed, it is the one present in the urine. Wastewater entering a treatment plant contains a large proportion of organic nitrogen (albumin, carbamide, etc.).

What is the nitrogen ratio of a municipal wastewater?

Conversely, a high ratio will lead to total assimilation of nitrogen but there will be residual carbon pollution. For municipal wastewater, the COD/NTK ratio is therefore between 7 and 20. That is to say that the lower the ratio, the more it will be necessary to add an additional carbon source during the denitrification stage.