The RAEBL (waste water treatment management) is the organization in charge of treating wastewaters from five cities on the South shore of Montreal: Candiac, Delson, La Prairie, Sainte-Catherine, and Saint-Constant.

The treatment plant uses an activated sludge process with extended aeration. To reduce its greenhouse gases and operation costs related to the burying of the sludge, the RAEBL is building a new biomethanization plant and an organic matter dryer system for matters extracted from the waste water treatment.

The process includes thermophile hydrolysis and mesophilic anaerobic digestion. Sludge is then centrifuged before being sent to a dryer using extracted biogases.