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Treatment Plant Ozone Retrofit Program. California Unified Program 8 th Annual Training Conference February 8, 2006 Presented by: Paul G. Beswick Metropolitan Water District of Southern California Environmental Support Services (213) 217-5533 [email protected]

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Treatment Plant Ozone

Retrofit Program

California Unified Program 8th Annual Training Conference

February 8, 2006

Presented by: Paul G. Beswick

Metropolitan Water District of Southern California

Environmental Support Services

(213) 217-5533 [email protected]


Southern california s imported water l.jpg

California Aqueduct

Colorado

River Aqueduct

Southern California’s Imported Water

High Salinity

Low DBPs

Lower Salinity

High DBPs

SERVICE

AREA


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Drivers for Treatment Improvements

  • Water Quality

    • Regulatory compliance

    • Salinity management

    • Taste-and-odor control

  • System Operations

    • Remove plant capacity limitations

    • Maximize flexibility of supply



Plant process flow diagram l.jpg

Poly

Chlorine

Alum/Ferric

Acid

Caustic

Ammonia

Chlorine

Ammonia

Caustic

Plant Process Flow Diagram

Ozone Destruct

Ozone

Oxygen

Generation

Ozone

Generation

Hydrogen

Peroxide

LOX

Ozone

Contactors

Flash

Mix

Meter

Filter Aid

Floc Aid

Chlorine

To Member

Agency

Connection

Finished

Water

Reservoir

Flocculation

Sedimentation

Filtration


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ORP General Design Criteria

  • Plant Flow Range is 60 to 750 MGD

  • Design Ozone Dose of 2.6 mg/L at 750 mgd

  • 8.6% Design Ozone Concentration

  • O3 Generation up 15,000 lb/day

  • Contactors Designed for 10 Minute HDT


Ozone process flow diagram l.jpg
Ozone Process Flow Diagram

OZONE

GENERATION

SYSTEM

OZONE

CONTACTOR

SYSTEM

VENT OZONE

DESTRUCT SYSTEM

LIQUID OXYGEN FEED

GAS SYSTEM

PSU

OZONE

DESTRUCT

CATALYST

BED

OZONE

CONTACTOR

OZONE

GENERATOR

DESTRUCT

BLOWER

LOX

TANK

LOX

VAPORIZER

HEATER

OPERATING = 6

STANDBY = 0

FUTURE = 2

OPERATING = 2

STANDBY = 1

FUTURE = 1

OPERATING = 1

STANDBY = 1

DEFROST = 1

FUTURE = 1

OPERATING = 5

STANDBY = 1

FUTURE = 4

OPERATING = 2

STANDBY = 1

FUTURE = 1

OPERATING = 4

STANDBY = 1

FUTURE = 2

NITROGEN SYSTEM

OPERATING = 1

STANDBY IS A

BOTTLE SYSTEM

RECEIVER

TANK

DRYER

COMPRESSOR






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Ozone Contactor Schematic

Ozone Off Gas

Raw

Water

Hydrogen Peroxide

Ozone Feed Gas



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Lessons Learned

  • Standardized Alarm Beacons

  • Disconnected Sample Line Vent to Contactor

  • Warning Signals on Ozone Building Roof

  • Safety Signs Throughout Facilities

  • Automatic Shutoffs in Boiler Room

  • New Gasket Material for Sulfuric Acid

  • New Gasket Material for Ozone System

  • Contactor Sample System Modification

  • Added check valve at O3 generator outlet

  • Seal Drain Sumps and Contactor Cover Plates

  • 1 Year Life on O3 Ambient Detector Probes


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