Orange Park, FL

The engineers at WET Engineering have been providing continuing engineering services to CCUA for over ten years. Part of the contract included two back to back 2.0 mgd expansions on the Spencer’s WWTF. The Spencer’s WWTF Phase IV Expansion for CCUA expanded the utility’s existing 0.5 mgd treatment plant to 2.0 mgd capacity. The design included a new headworks structure with a cylindrical fine screen, screw conveyor, and a vortex grit removal unit. In addition, a new 1.75 million gallon prestressed concrete biological treatment unit employing the Eimco Carrousel denitIR process, two 82-foot secondary clarifiers to remove total suspended solids, two traveling bridge sand filters providing high level disinfection, two chlorine contact chambers totaling 75,000 gallons, and a new effluent pump station with two 50 horsepower centrifugal pumps.

In addition to permitting, other challenges with the project included design of tie-ins of two existing force mains to the new plant, from opposing directions. A reject water control scheme was also designed, where reject water can be diverted to the newly-constructed reject storage tank and ultimately back to the new headworks. In addition to complete design services, bid assistance, preparation of contract documents and specifications, construction services and final certification services were also provided.

The Phase V Expansion, recently completed in July 2010, included the design and construction of an additional cylindrical fine screen and vortex grit removal unit, a second 2.0 million gallon prestressed concrete biological treatment unit employing the Eimco Carrousel denitIR process, one 82-foot secondary clarifier to remove TSS, one traveling bridge sand filter, an additional chlorine contact chamber, new RAS / WAS pump station, additional effluent transfer pump, one 1.1 million gallon reclaimed storage tank, and an additional reclaimed water high service pump, and diesel generator with above ground fuel storage tank.