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Chlorine Disinfection of Drinking Water. 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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chlorine disinfection of drinking water
Chlorine Disinfection ofDrinking Water

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]

slide2

Typical Water Treatment Plant

FLASH MIX

COAGULATION / FLOCCULATION

SEDIMENTATION

Mixes chemicals with raw water containing fine particles that will not readily settle or filter out of the water.

Cl2

Gathers together fine light particles to form larger particles (floc) to aid the sedimentation and filtration processes.

Settles out larger suspended particles.

Cl2

PRE-CHLORINATION

Kills disease causing organisms and helps control taste-and-odor causing substances.

CHLORAMINES

Kills disease causing organisms. Provides disinfectant residual for the distribution system.

CORROSION CONTROL

Cl2

NH3

Cl2

NaOH

Adjusts the pH of the treated water to inhibit corrosion of pipelines.

FILTRATION

Filters out remaining suspended particles

CLEARWELL

TO DISTRIBUTION SYSTEM

Provides contact time for disinfection. Stores water for high demand.

DAF 9-20-00

the chlorine disinfection process
The Chlorine Disinfection Process
  • Public Health benefits of chlorination
  • Process flow
  • Process components
chlorination public health benefit
Chlorination Public Health Benefit
  • A critical role protecting US drinking water supply from waterborne infectious diseases for over 90 years
  • Cholera, typhoid, dysentery, hepatitis A virtually eliminated
  • In over 98% of disinfection systems
  • Germicidal potency, residual disinfection properties, efficiency, economy
chlorine trailer unloading
Chlorine Trailer Unloading

17/19 Ton Trailers

stationary chlorine tank
Stationary Chlorine Tank

25 ton stationary tank

chlorine system safety what we are doing
Chlorine System Safety - What we are doing
  • 24 hour monitoring and access control
  • Detailed operating procedures
  • Highly trained staff
  • Leak sensors and alarms
  • Automatic supply shut-off valves
  • Chlorine containment and neutralization
  • On-site emergency response capability + strong relationship with fire dept responders
slide17

Control Room

  • Operator on duty 24 hours a day.
  • Chlorine alarms are received in the Control Room.
  • Chlorine facilities are visually inspected twice a shift.
slide19

Chlorine Trailer Manway

  • Remote emergency shut-off capability
  • Highly sensitive chlorine gas detector
slide20

Multiple Emergency Shut-off Locations

  • Controlled from several strategic locations
  • Shut-off is immediate
slide21

Monel Flex Hose Connection

  • Durable/flexible connection
  • Inspected/replaced regularly
slide22

Chlorine Gas Monitoring

  • Continuous monitoring, alarms locally and in Control Room
  • Sensors strategically placed throughout plant
  • Calibrated regularly
slide23

Chlorine leak alarms

  • Audio/Visual chlorine gas leak alarms - immediate notification to all plant personnel.
slide24

Vacuum Operation

  • Chlorine piped to points of use throughout plant under vacuum
  • Safest method of transmission
caustic neutralization system
Caustic Neutralization System

Two 3.5-Ton Chlorine Scrubbers

where is the real chlorine release threat1
Where Is The Real Chlorine Release Threat?!
  • Two train wrecks in 6 months
    • resulted in significant chlorine releases
    • 12 dead
    • over 600 taken to hospital
    • over 5,000 evacuated.
chlorine rail transportation issues
Chlorine Rail Transportation Issues
  • Rail freight cost cutting, lack of re-investment, explosive growth, stretched resources
  • Security
    • In transit
    • Storage while in transit
  • Identifying hazmat derailment
  • Warning local first responders
  • Mobilizing specialist response team
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