Alizair™ / Alizair™ Package Plant
Wastewater collection and treatment often involve the production of unpleasant smells.
In the sanitation network, the absence of air (and more precisely of oxygen) makes that wastewater become septic, and also malodorous. Gases are accumulated in the sewer headspace and emission to the open air can occur at the outlet in the treatment plant.
Wastewater and its by-product treatment (sludge, scum, etc.) also generate unpleasant smells.
The chemical species responsible of the olfactory nuisances are mainly Sulphide, Nitrogenous compounds and, sometimes, Volatile Organic Compounds (VOC).
The sulfide compounds mainly come from wastewater pretreatment, thickening and sludge dewatering stages. The nitrogenous compounds and the VOC are mainly from the sludge treatment.
To avoid the propagation of odors and provide the operating agents with a healthy and safe environment, the works are put in negative pressure, the polluted air is collected and undergoes a deodorization treatment via the Alizair™ process.