Zoom in on microorganisms

Filters

Filamentous bacteria ZoomZoom
© Water treatment plant in Ste-Rose
BiofiltersZoomZoom
© Nicole Catellier, Cinémanima inc.

Biological treatment of drinking water

One possible step in the treatment of water to make it potable is to pass it through a charcoal filter colonized with bacteria and protozoa. The microorganisms feed on the organic waste present in the water. This filter, also called a biological filter, because the bacteria have lodged in it naturally, helps produce biologically stable potable water which maintains its quality throughout the water distribution network.

The filtration plant also puts microbes to work!

The Auteuil filtration plant in Laval, Quebec, cleans wastewater before returning it to the river. It uses shale (a rock with a layered structure) biofilters containing bacteria that contribute to the water purification process, as do decantation and decontamination with UV radiation.