Project Description: The Evitts Creek Water Treatment Plant was originally constructed in 1913 with six filters and a capacity of 6.0 MGD. Since that time, as demand from the City of Cumberland and surrounding communities grew, the water treatment plant was expanded and upgraded. Before construction of the current project the facility consisted of dissolved air flotation (DAF) retrofitted within two circular clarifiers and 14 filter units

Spotlight Project
Dissolved Air Flotation Units
The performance of the retrofitted DAF units within the circular clarifiers was significantly less efficient than anticipated. Their performance yielded a capacity of 9.0 MGD, much less than the filtration capacity of 18.0 MGD. In an effort to overcome the operation problems and increase plant capacity caused by the ineffective DAF units, the F.B. Leopold Company, Inc. pilot tested their DAF system. Based on the pilot test results and a performance guarantee, the design-build team of Wayne Crouse, Inc., F.B. Leopold Company, Inc., and KLH Engineers, Inc. was assembled. The project scope included the following.

  • Three parallel 6.0 MGD DAF units enclosed within a superstructure and including mechanical rapid mixing, two-stage mechanical flocculation, recycle pumping system, saturation system, and sludge collection and pumping.
  • Complete renovation of six filters including new filter bottoms, media, air scour, piping and valves including rate of flow and filter to waste.
  • Conversion of retrofitted clarifiers/DAF units to sludge holding and mixing tanks.
  • Conversion of covered sludge drying beds to building space for installation of a new belt filter press and bulk caustic soda storage.
  • All of the work also requires SCADA system design and integration with the existing plant SCADA system.