However, an oxygen concentrator might be able to help, as it simply removes nitrogen.

This system simplifies the process of removing nitrogen from wastewater.

They work by removing nitrogen from room air to make 94-98 percent oxygen.

Different treatment processes are required to remove nitrogen and phosphorus.

Certain lichens are able to remove nitrogen from the air and convert it into a form that plants can use as a nutrient.

The name can be applied any system that removes nitrogen from natural gas.

He cited Norwalk, which is rebuilding its sewage treatment plant with an eye to removing nitrogen at very high levels.

We see a new $6 million sewage treatment plant, which will be out of date next year because it does not remove nitrogen from the effluent.

A decision to remove nitrogen at sewage treatment plants could cost a billion dollars.

Improving sewage treatment to remove nitrogen would thus check the flow of nutrients.