South Fork WT Plant Tour5/1/2007

South Fork WT Plant Tour5/1/2007

Water Source: Water Source: The Clackamas RiverThe Clackamas River

Tour Guide Mark CageTour Guide Mark CageSouth Fork WT PlantSouth Fork WT Plant

15962 S Hunter Ave. Oregon City,15962 S Hunter Ave. Oregon City, Oregon 97045, Oregon 97045, (503) 657-5030 (503) 657-5030

The Control Room:Where all Plant data is recorded

The Control Room:Where all Plant data is recorded

SCADASCADASupervisory Control And Data Supervisory Control And Data AcquisitionAcquisition

SCADA Stats:SCADA Stats:

• Plant during tour is running at 10.3 Plant during tour is running at 10.3 MGDMGD

• Plant runs at approximately 6 MGD in Plant runs at approximately 6 MGD in Winter, 18 MGD in SummerWinter, 18 MGD in Summer

• Current Alum dosage at 4.5 parts in Current Alum dosage at 4.5 parts in the Rapid Mix the Rapid Mix

• Pre-feed Polymer #LT7990 dosage Pre-feed Polymer #LT7990 dosage at .8 partsat .8 parts

• Plant during tour is running at 10.3 Plant during tour is running at 10.3 MGDMGD

• Plant runs at approximately 6 MGD in Plant runs at approximately 6 MGD in Winter, 18 MGD in SummerWinter, 18 MGD in Summer

• Current Alum dosage at 4.5 parts in Current Alum dosage at 4.5 parts in the Rapid Mix the Rapid Mix

• Pre-feed Polymer #LT7990 dosage Pre-feed Polymer #LT7990 dosage at .8 partsat .8 parts

Pilot Filters:Pilot Filters:Conveniently located in the Control Conveniently located in the Control

RoomRoom

Pilot Filters:Pilot Filters:Conveniently located in the Control Conveniently located in the Control

RoomRoom

Dual media filtersDual media filters4’ Anthracite coal4’ Anthracite coal 1’ Garnet sand1’ Garnet sand

Pilot Filters:Pilot Filters:

• Miniature replicas of the main filtersMiniature replicas of the main filters

• Sampled daily Sampled daily

• Help avoid plant shut down Help avoid plant shut down

• Save about ½ hour per day on the work Save about ½ hour per day on the work loadload

Stream Current MonitorStream Current Monitor

Stream Current MonitorStream Current Monitor

Optimizes coagulant dosage Optimizes coagulant dosage

Chlorine Spikes or “Slugs”Chlorine Spikes or “Slugs”

• Plant start-up causes 5 minute Plant start-up causes 5 minute chlorine spikechlorine spike

• Spike goes down as plant comes on-Spike goes down as plant comes on-lineline

Rapid Mix Injection Order:

•Polymer•Alum•Pre-Chlorination with Sodium

Hypochlorite•Flash Mixed by use of pump turbulence,

(no mechanical mixing takes place)

Factoid:One pound Liquid Alum equals 5.3 LBS of

dry Alum

•Polymer•Alum•Pre-Chlorination with Sodium

Hypochlorite•Flash Mixed by use of pump turbulence,

(no mechanical mixing takes place)

Factoid:One pound Liquid Alum equals 5.3 LBS of

dry Alum

Polymer DeliveryPolymer Delivery

Pretreatment

•#LT7990 dosage at .8 parts#LT7990 dosage at .8 parts

•Current Current Alum Alum dosage at dosage at 4.5 parts in 4.5 parts in the Rapid the Rapid MixMix

Pretreatment

Alum PumpsAlum Pumps

Alum TankAlum TankCorrosive Material Corrosive Material Post welded measurementsPost welded measurements

Pretreatment

Pretreatment: Sodium Pretreatment: Sodium HypochloriteHypochlorite

Chlorine Pre-feed at 0.7 Chlorine Residual at 1.0Chlorine Pre-feed at 0.7 Chlorine Residual at 1.0

Pretreatment

Rapid Mix wellRapid Mix well

AlumAlum

ChlorineChlorine

Alum, Polymer and Sodium hypochloriteeAlum, Polymer and Sodium hypochloritee

PolymerPolymer

Flocculation Chamber with Flocculation Chamber with Serpentine BafflesSerpentine Baffles

Sedimentation/Contact Sedimentation/Contact BasinBasin

$100 Plastic Tube used to prevent $100 Plastic Tube used to prevent wave vibration caused buy pumpingwave vibration caused buy pumping – Savings: $100,000 in repairs! – Savings: $100,000 in repairs!

Dual Media Filter:Dual Media Filter:

•4’ Anthracite Coal4’ Anthracite Coal - - 1’ Garnet 1’ Garnet SandSand. . •Backwash after approximately Backwash after approximately 70hrs depending on turbidity. 70hrs depending on turbidity. •Filter Aid Polymer is used.Filter Aid Polymer is used.•Flow approximately 2000 GPM Flow approximately 2000 GPM during tour.during tour.

View of Pipe gallery While Standing View of Pipe gallery While Standing over Clear Well (.55 Million Gallons)over Clear Well (.55 Million Gallons)

Sodium Hypochlorite Generation:Sodium Hypochlorite Generation:Injection of salt water reacts with 700 amps of Injection of salt water reacts with 700 amps of electricity and titanium plates. Produces 600 electricity and titanium plates. Produces 600 lbs 0.8% NaOCllbs 0.8% NaOCl per day (300 lbs per cell).per day (300 lbs per cell).

Disinfection:Disinfection:

Sodium Hypochlorite Generation:Sodium Hypochlorite Generation:Injection of salt water reacts with 700 amps of Injection of salt water reacts with 700 amps of electricity and titanium plates. Produces 300 electricity and titanium plates. Produces 300 lbs 0.8% NaOCllbs 0.8% NaOCl per day.per day.

Two cells= 600 lbsTwo cells= 600 lbs

On-site Generation of On-site Generation of Disinfectants (OSG)Disinfectants (OSG)

On-site Generation of On-site Generation of Disinfectants (OSG)Disinfectants (OSG)

Hydrogen bubblesHydrogen bubblesAnodeAnode

CathodeCathode

2Cl- >> Cl2 + 2e-2Cl- >> Cl2 + 2e- 2H2O + 2e->>H2 + 2OH-2H2O + 2e->>H2 + 2OH-

NaCl + H2O >>>NaOCl + H2NaCl + H2O >>>NaOCl + H2

HOCl + OH->>H2O +OCl-HOCl + OH->>H2O +OCl-

cellWater Softener

Brine tank

On-site Generation of On-site Generation of Disinfectants (OSG)Disinfectants (OSG)Advantages:Advantages:

Operator safety: Operator safety: No toxic No toxic chlorine gas handling, safety and chlorine gas handling, safety and regulationregulationGreener solutionGreener solution: No chemical : No chemical shipments (all you need is pure shipments (all you need is pure NaCl)NaCl)Minimal storageMinimal storage

Advantages:Advantages:Operator safety: Operator safety: No toxic No toxic chlorine gas handling, safety and chlorine gas handling, safety and regulationregulationGreener solutionGreener solution: No chemical : No chemical shipments (all you need is pure shipments (all you need is pure NaCl)NaCl)Minimal storageMinimal storage

On-site Generation of On-site Generation of Disinfectants (OSG)Disinfectants (OSG)

Disadvantages:Disadvantages:Hydrogen gas generation: Hydrogen gas generation: Toxic, Toxic, colorless, flammable (vent) colorless, flammable (vent) regulationregulationNeed steady water composition Need steady water composition and have to soften waterand have to soften waterCell maintenanceCell maintenance: Need to wash : Need to wash with muriatic acid (HCl)with muriatic acid (HCl)

Disadvantages:Disadvantages:Hydrogen gas generation: Hydrogen gas generation: Toxic, Toxic, colorless, flammable (vent) colorless, flammable (vent) regulationregulationNeed steady water composition Need steady water composition and have to soften waterand have to soften waterCell maintenanceCell maintenance: Need to wash : Need to wash with muriatic acid (HCl)with muriatic acid (HCl)

Chlorine MetersChlorine Meters

Chlorine Stats:

•Chlorine Pre-feed at 0.7

•Chlorine Residual at 1.0

•Chlorine Pre-feed at 0.7

•Chlorine Residual at 1.0

High Turbidity:

• The technique used at South Fork for dealing with extremely high turbidity is to use both Polymer and Alum in increased dosages.

Soda Ash DeliverySoda Ash Delivery

•Dry hopper Dry hopper •Lead and Copper RuleLead and Copper Rule

Soda Ash mixerSoda Ash mixer

Soda Ash in bags used for pH Soda Ash in bags used for pH adjustmentadjustment

EndEnd