Removal of nutrients from wastewater
One of the main sources of eutrophication in the Baltic Sea is discharge of wastewater, which contains nutrients in the form of nitrogen (N) and phosphorous (P).
There is a vast patent literature relating to the removal of nutrients from wastewater. All is not included here, but we present a large selection. We have divided the inventions into three categories:
Industrial and municipal wastewater
Small-scale treatment of domestic sewage
Wastewater from ships
There is of course an overlap between these categories, since many treatment technologies can be applied to various kinds of wastewater.