TREATMENT UPGRADES

PARSONS AVENUE WATER PLANT

Melanie Gamez, P.E.CH2M

Presentation Topics

Parson Avenue Water Plant (PAWP) Background

Process Improvements and Design Considerations

Electrical Upgrades

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

Proposed Treatment Plant Process

PAWP Existing Construction Site

Primary/Secondary Clarifiers

Split Treatment Softening 80% Raw Water Treated in Primary Clarifiers 20% By-Pass Blended in Secondary Clarifiers

Primary Clarifier Upgrades

7

New Contact Clarifier Equipment.

Increased Treatment Capacity from 25 MGD to 30 MGD.

Turbine Mixer

Stainless Steel Construction

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

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

Temporary CO2 Storage

10

New Electrical Building within existing Storage Tank Footprint.

Contractor provided Temporary CO2 Storage Tanks

Used Existing Feed Equipment

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

New Clearwell

12

New 11 MG Clearwell (Existing 11 MG Clearwell)

Provides Operation Flexibility & Additional Storage

Valves provided for 4 Operational Scenarios

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

EXISTING ELECTRICAL SYSTEM

Power & Distribution System

Dual Power Feeds to PAWP

Automatic Transfer Switch

MCC’s Original Equipment

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

New Electrical Building

Thank You

Questions?