William E. Dunn Water Reclamation Facility. Facility Overview & Information

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1 William E. Dunn Water Reclamation Facility Facility Overview & Information

2 General Area Served: Plant History Facility Highlights Northern Pinellas County St. Joseph Sound to East Lake Road (E/W) Tampa Road to Keystone Road (N/S) Owner: Operator: Pinellas County Utilities Pinellas County Utilities Million Gallons per Day (MGD) Extended Aeration wastewater treatment facility, utilizing reclaimed water distribution for effluent disposal Construction of new 9.0 MGD 5-stage Bardenpho Advanced Wastewater Treatment Water Reclamation Facility, with expanded utilization of reclaimed water distribution. Old 3.0 MGD facility taken out of service Existing facility enhanced by construction of Center Oxidation Ditch, for improved process stability. Mid-1990 s - East Lake Tarpon area PCU package wastewater treatment facilities phased out and flows diverted to William E. Dunn Wastewater Reclamation Facility (WED WRF) for treatment Construction of new Facility Administration Building, with adjacent open public park area and education kiosk Phase 2 & 3 construction upgrades and modernization of the WED WRF. Facility Operation Average Daily Flow 6.5 MGD Operating Schedule 24 hours per day, 365 days per year Number of Collection System pump stations approximately 150+ Number of staff 24 positions (Administration, Operation & Maintenance) Type of Process Activated Sludge Process Mode 5-stage Bardenpho Advanced Wastewater Treatment Process Flow Distribution 100% reclaimed water distribution for irrigation purposes Biosolids Production about 1,500 dry tons per year (375+ semi-trailers) Biosolids Reuse dried sludge is used as a soil amending agent (fertilizer) Annual Budget - $5 million Average Treatment Cost per Million Gallons - $2000

3 North County Collection System Area (crosshatched area)

4 William E. Dunn WRF Plan Drawing

5 Mechanical Screens (3) Influent Screenings to Disposal Low Pressure RCW Pumps High Pressure RCW Pumps Low Pressure Reclaimed Water (RCW) High Pressure RCW to Off-Site Irrigation Grit Recovery Units (3) Reject Water Storage Pond Reclaimed Water Storage Pond Influent & RAS Flow Meters Plant Drain Filtrate One of 6 Clarifiers Fermentation 1st Anoxic Fermentation 1st Anoxic Contact s (3) Backwash Water Oxidation Reactor Oxidation Reactor Internal Recycle Pump Stations (2) ABW Sand Filters (4) Polyaluminum Chloride Return Activated Sludge (RAS) Sludge Pumping Station Aerated Sludge Holding s (2) Waste Activated Sludge (WAS) Sludge Feed Pumps (2) Polymer Belt Press Belt Press Dewatered Sludge to Disposal 2nd Anoxic Reaeration 2nd Anoxic Reaeration Distribution Boxes (2) Final Clarifier s (6) W.E.Dunn WRF Process Flow

6 William E. Dunn WRF RCW Storage Pond Levels RCW WW Elevation Storage Gallons Usable RCW Operational Alarm (Feet) (Millions) Wet Well Level Volume (mg) Levels Pump Cut 7.45 Usable storage volume is approx MG

7

8 INFLUENT PRELIMINARY TREATMENT SCREENING Removal of rocks, rags, and other debris GRIT REMOVAL Removal of sand and grit FLOW MEASUREMENT Measurement of Influent and Return Activated Sludge (RAS) flow rate BIOLOGICAL TREATMENT BARDENPHO PROCESS Biological Oxygen Demand (BOD) and Nutrient removal CLARIFICATION Separation of suspended biological solids from wastewater SOLIDS HANDLING Treatment & disposal of solids from other processes EFFLUENT POLISHING FILTRATION Removal of suspended solids not removed by Clarification DISINFECTION Destruction of diseasecausing organisms EFFLUENT DISPOSAL EFFLUENT STORAGE Stores reclaimed water until needed EFFLUENT REUSE Highly treated effluent is reused as irrigation watw W.E. Dunn WRF Process Flow Chart

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