This Idaho municipality aimed to thicken Waste Activated Sludge (WAS) from the existing secondary clarifiers before being sent to the digestors. Their existing coated carbon steel DAF units were badly deteriorating.  FRC designed a new stainless-steel DAF system to replace the functionality of the previous system and provide the increased durability and longevity of stainless steel.

This northern municipality’s existing secondary clarifier thickened the Waste Activated Sludge (WAS) generated from an oxidation ditch process to yield 0.5-1% dry solids. The anaerobic digestor which followed the thickening process had become hydraulically overloaded prompting a need to further reduce WAS volume.   FRCs design provided a DAF thickener after the clarifier to further reduce WAS volume and achieve 4-5% dry solids before sending it to the anaerobic digestor.