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BioSolids Improvements Project

Project Description

The project entails construction of an advanced digestion to process residuals (waste) from the 70-mgd East Central Regional Water Reclamation Facility (ECRWRF). The project is driven by the need to replace aging plant infrastructure and to maximize solids reduction to address increases in biosolids disposal costs. The project will upgrade to sludge storage and thickening facilities, replacement of aerobic digestion with temperature-phased anaerobic digestion (TPAD), co-digestion of secondary sludge with hauled grease interceptor waste (FOG), replacement of belt filter press dewatering with high-solids centrifuge dewatering, conversion of the aerobic digester to a fourth aeration basin with an anaerobic selector for biological phosphorous removal, and disposal of dewatered biosolids to a regional pelletization facility. The selected biosolids treatment improvements will reduce hauled solids by approximately 30% and meet the allotted capacity constraints at the regional pelletization facility. Click here to see the Project Executive Summary.

ECRWRF is a 70-mgd activated sludge secondary treatment plant in the West Palm Beach, Florida that serves the Cities of West Palm Beach, Lake Worth and Riviera Beach; the Town of Palm Beach, and the northern half of Palm Beach County.  City of West Palm Beach is the operating entity.


The project is anticipated for startup in January 2018.

Project Cost

Estimated cost of construction is $92.6 million.

Project Highlights

  • The treatment plant has capacity to treat 70 million gallons per day (MGD) of wastewater
  • This project will process an average of 1,000 wet tons of residual solids per day
  • This project will use advanced digestion and centrifuge dewatering to reduce offsite biosolids disposal by 30 percent
  • Advanced digestion process will generate excess biogas that can be used as a renewable energy source to offset consumption of electricity or natural gas
  • More than 25,000 CY of cast-in-place concrete
  • More than 3500 tons of reinforcing rebar
  • More than 26,000 lf of underground process piping
  • More than 32,000 lf of underground duct banks
  • Excavating & Relocating over 56,000 cy of materials
  • Two Tremie Pump Stations
  • Designed 1/2 site on green 28 acre site
  • Large portion of project on existing plant kept in service
  • Over 33 Permits for the project with over 26 structures


City of West Palm Beach Public Utilities
Project Manager:  Matthew Schultz

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