The PRIMARY TREATMENT process consists of a series of tanks that allows the separation of heavy solids (fecal matter) and floating solids (greases and oils) from the wastewater. The PRIMARY CLARIFIERS are sized to permit enough detention time so that large solid material settles to the bottom of the tanks. These solids are then continually scraped from the bottom and transferred to the ANAEROBIC DIGESTERS for further treatment.

Greases and oils are collected from the surface of these tanks and are also conveyed to the anaerobic digesters.