Benjamin C. Whitehead, PE Benjamin J. Klayman, PhD, PE Case Study: Commissioning New Rapid Sand Filters at Donald K. Shine Water Treatment Plant

July 2010

Plant Flow Schematic

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 Media Installation

July 2010 Completed Filter Cell

July 2010 Filter Backwash Equipment Backwash Pump  Perless Pump Company  Vertical Turbine Mixed Flow  250 Hp  feet TDH Air Scour Blower  Gardner-Denver  Multi-stage Centrifugal  300 Hp  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 STF Filter

July 2010 SCADA Screen – Filter No. 13 Selection

July 2010 Filter Backwash – Selectable Parameters

July 2010 Backwash with Air Scour

July 2010 Backwash with Air Scour

July 2010 Backwash

July 2010 Backwash

July 2010 MDNRE Requirements Maintain NTU < 0.3 (<0.1 normally) < MGD 2 Consecutive 15 min. NTU > Consecutive NTU > 0.5 first 4 hours 2 Consecutive NTU > 1.0, 3 consecutive months 2 Consecutive NTU > 2.0, 2 consecutive months B&V / City of Wyoming Start-up Goals

July 2010 Commissioning Plan How do we get there? Careful Planning Start Slowly Filter to Rest Monitor/Operate Closely  Flow  Turbidity  Headloss

July 2010 Commissioning Pre-requisites  Media Washing/Screening  VOC testing  Chlorination  Instrumentation / Alarms  Monitoring / Trending  SCADA Control  Backwash Equipment  Backwash Sequence  Transfer Pumping

July 2010 Commissioning Plan Initial Start-up:  Initiate Filter Off-line (Filter-to-Waste) 1 MGD, Filter-to-Waste until < 0.3 NTU  Filter On-line: 1 MGD > 0.3 NTU, Initiate Settling-delay: 4 hours Re-test: <0.1 NTU up to 3 MGD Seasoning:  2 weeks up to 3 MGD  1 week off-line

July 2010 Commissioning Plan Performance Test: Run Filter Several minutes Backwash Place On-line, 1 to 3 MGD Ramp min intervals  > 0.2 NTU Initiates Continuous Monitoring  > 0.3 NTU Initiates Filter-to-Waste Ramp to 7 MGD for 1 hour < 0.1NTU

July 2010 SCADA Screen – STF Filter Overview

July 2010 Filter No. 13 Start-up

July 2010 Filter Performance (Results) Filter Influent Turbidity: +/- 0.3 NTU Filter Effluent Turbidity: < MGD Filter Effluent Turbidity: 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 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 = 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

July Questions?