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TREATMENT UPGRADES
PARSONS AVENUE WATER PLANT
Melanie Gamez, P.E.CH2M
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Presentation Topics
Parson Avenue Water Plant (PAWP) Background
Process Improvements and Design Considerations
Electrical Upgrades
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PAWP BACKGROUND
Plant Design – Late 1970s Plant Construction/Start-Up – Early 1980’s Operations Upgrades Project – Late 1990’s Groundwater Plant – 6 Radial Collector Wells
Hydraulic Capacity – 50 MGD
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Proposed Treatment Plant Process
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PAWP Existing Construction Site
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Primary/Secondary Clarifiers
Split Treatment Softening 80% Raw Water Treated in Primary Clarifiers 20% By-Pass Blended in Secondary Clarifiers
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Primary Clarifier Upgrades
7
New Contact Clarifier Equipment.
Increased Treatment Capacity from 25 MGD to 30 MGD.
Turbine Mixer
Stainless Steel Construction
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Secondary Clarifier Upgrades
8
Rehabilitation of Existing Contact Clarifier Equipment.
Replaced Radial, Collector and Circular Launder with Stainless Steel Launders.
Steel Rehab and Paint
Rake Arms
Center Cage
Skirt
Bridge
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Recarbonation Basin
9
Existing pH Adjust Flume
Only Minutes of Detention Time.
New Basin provides 20 Minutes of Detention Time.
New Recarbonation Building and gas feed equipment.
New CO2 Storage Tanks: 3 – 50 Ton Tanks
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Temporary CO2 Storage
10
New Electrical Building within existing Storage Tank Footprint.
Contractor provided Temporary CO2 Storage Tanks
Used Existing Feed Equipment
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Filter Upgrades
11
Maintain Existing Filter Drain Clay Tiles
Replaced Media In-Kind
Replaced Subsurface Wash Sweeps with New Surface Wash Sweeps
Revised Backwash Sequence
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New Clearwell
12
New 11 MG Clearwell (Existing 11 MG Clearwell)
Provides Operation Flexibility & Additional Storage
Valves provided for 4 Operational Scenarios
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New Bulk Chemical & Transport SystemLime and Soda Ash
13
Existing Dense Phase System
High Pressure Compressors – Shared System
Two large Receivers
Continuous Problems – Plant modified to operate similar to Dilute Phase System
New Dilute Phase System
Blowers/Low Pressure – Dedicated System
Rotary Feeders
Dedicated Transfer Line for each Chemical
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EXISTING ELECTRICAL SYSTEM
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Power & Distribution System
Dual Power Feeds to PAWP
Automatic Transfer Switch
MCC’s Original Equipment
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New Plant Equipment
Reconfigure Power Feeds, more reliable Circuit for Primary Use
New Automatic Transfer Switch equipped with Radio Telemetry
New 15KV Switchgear
Option for automatic breaker operation
Arc-Resistant construction
Remote breaker operation
New Arc-Resistant 5KV Substation to Power Finished Water Pumps
New Arc-Resistant Low Voltage Substation for distribute 480V Power
New Low Voltage MCCs to Feed New and Existing Loads at PAWP
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New Electrical Building
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Thank You
Questions?