July 2010 South Treatment Facility – Phase IB Expansion
July 2010 Type of Filtration Six New Conventional Rapid Sand Filters Roberts Leotech Underdrain w/IMS Cap 12-inches Sand 24-inches Anthracite Water and Air Scour Backwash 1360 sq.ft. per Filter 4 gpm / sq.ft.
July 2010 New Filter Installation Filter Underdrain J-Tube Riser Air Scour Manifold
July 2010 New Filter Installation Grout Bed Grout Infill
July 2010 New Filter Installation Completed Underdrain
July 2010 Filter Backwash Equipment Backwash Pump Perless Pump Company Vertical Turbine Mixed Flow 250 Hp 32 MGD @ 17.5-feet TDH Air Scour Blower Gardner-Denver Multi-stage Centrifugal 300 Hp 5440 scfm @ 6.2 psig
July 2010 Filter Backwash Backwash Sequence Drain filter to 6-inches above media Initiate Air Scour 2 minutes Add 4 gpm/sq.ft. Low Rate BW (8 MGD) until just below troughs Stop Air Scour and continue Low Rate water only to top of trough Initiate 17 gpm/sq.ft. High Rate BW (32 MGD) 4 minutes Low rate BW (8 MGD) for 1 minute 10 minute settling delay Open effluent valve 2 minutes after filling starts Backwash is reclaimed / returned to raw water influent of the plant
July 2010 Filter Performance (Results) Filter Influent Turbidity: +/- 0.3 NTU Filter Effluent Turbidity: < 0.1 NTU @ 7 MGD Filter Effluent Turbidity: 0.02-0.07 after Initial Commissioning & Current Conditions Filter Headloss: 1 to 7.5-feet Run Time: 200 hours - New and Existing Filters 4X longer after expansion Previously 40-60 hours
July 2010 Filter Performance Meurer Research Inc. Plate Settling Equipment
July 2010 Field Engineering Improvements Reduced Washwater Quantity Reduced High Rate Wash: 10 minutes to 4 minutes Total Wash Volume = 75 gal / sq.ft. (100,000 gal) Industry Standard = 150-180 gal / sq.ft. (250,000 gal) Allows for 5 Consecutive Backwashes to Reclaim Operator Adjustable Settling Delay Washwater Launder Stabilization Headloss Instrumentation Calibration Air Distribution Optimization
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