Dissolved Air Flotation (DAF) Applications for Drinking ...
Transcript of Dissolved Air Flotation (DAF) Applications for Drinking ...
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1 INFILCO DEGREMONT, INCINFILCO DEGREMONT, INC
Dissolved Air Flotation (DAF) Applications for Drinking and Wastewater Treatment
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AquaDAF
This Presentation
Applications
Where will you find DAFs?
How it works?
Key Benefits / Features
Photos
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Applications for Dissolved Air Flotation
Low turbidity
High TOC, colored waters
Algae removal
Membrane filtration pretreatment
Desalination pretreatment
Retrofit expansions
Backwash Residuals
Tertiary Clarification
AlgaeReservoirs
Lakes
Cold waters Small,
light-weight particles with a desire to float
Avoid...• Heavy
solids• High TSS• Silt
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SUEZ North American Installations
Largest PlantHaworth, NJ 208-MGD(10 units – 16 gpm/ft2)
ApplicationsDrinking Water: 26
23 Standard Clarification3 Membrane Pretreatment
Wastewater: 31 DW Membrane BWW1 BAF BWW1 Tertiary phos.
*Map not up to date
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Coagulation Flocculation Separation
Operating Principles
The operating principles are similar to a conventional treatment process
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Coagulation and Flocculation System
Coagulation - The destabilization of colloidal particles via the neutralization of the particles surface charge
• Rapid mixer or static mixer
• Coagulant: typically Alum, Ferric, or PACl
Flocculation - The agglomeration of the destabilized particles into a larger floc
• Two stages mixing, typically mechanical mixers
• Polymer: Rarely required
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Separation System
Recycle Pump Saturation Tank Bubble Bed
At the heart of a DAF is the recycle stream. Here, process air bubbles are produce, adhere to floc, and float to the surface clarifying the water
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Collection and Sludge
Clarified water is collected at the bottom of the flotation zone using a specially designed collection system for high rate treatment.
The floated solids are periodically removed either hydraulically or mechanically using a scraper..
Hydraulic: the water level is raised until the sludge flows into the sludge trough
Mechanical: A scraper pushes the sludge into the sludge trough.
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High Loading Rate
AquaDAF’s high-rate is achieved in the special collection zone
The top CFD analysis shows bubble concentration, the bottom shows water velocity
Variable Headloss +
Inclined baffle
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Key Benefits
1. Algae Removal
2. Phosphorus Removal
3. Membrane Pretreatment
4. High loading rate : small footprint
5. Package Units and Piloting
6. Experience
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Key Feature: Algae removal
1. Algae can be difficult to settle. The particles are light and have a natural tendency to float.
2. Algae blooms can blind filters and cause short filter run times
3. Algae can causes taste and odor complaints
http://www.flickr.com/photos/plant_diversity/3494375292/
Haworth, NJIncreased filter run time from:
6-10 hrs → 48-72 hrs Average 93% removal
Lake Deforest, NYIncreased filter run time from:
20-35 hrs → 60-90 hrs Average 93% removal
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Key Feature: Phosphorus removal
0.01
0.10
1.00
10.00
100.00
5/17/2006 7:12 5/17/2006 8:24 5/17/2006 9:36 5/17/2006 10:48 5/17/2006 12:00 5/17/2006 13:12 5/17/2006 14:24 5/17/2006 15:36 5/17/2006 1
Raw Turbidity Raw Ortho Phosphorous DAF TurbidityDAF Ortho Phosphorous Filter Turbidity Filter Ortho Phosphorous
Settings:Rise-rate: 12gpm/ft2 (104gpm)Coagulant: FeCl3 (40ppm)Floc Time: 11.3min (2 basins)Recycle f low : 13gpm (12.5%)Recycle pressure: 87psi
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Key Feature: Membrane Pre-treatment
Pre-treating reduces the solids load on membranes → Fewer modules / higher net recovery
No polymer required→ higher flux rates
No abrasive ballast→ longer membrane life
‘Insurance’ → Protect membranes
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Key Feature: High-rate → smaller collection zone
12 gpm/ft2
4 gpm/ft2
2 gpm/ft2
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Key Feature: Small footprint
Less concrete: • Save material and install time
Less land:• More expansion capacity• Fits in limited available areas
Smaller building: • Save materials and O&M
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Key Feature: Retrofit, Flexible Layouts
Seneca WTP, SC 12-MGD, 2 units, 9.6 gpm/ft2Old Sedimentation Basins
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Key Feature: Package Plants
Available in size from 0.1 - 2.5 MGD
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AquaDAF
Key Feature: Package Plants
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Key Feature: Piloting
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Key Feature: 29 North American Installations
Largest PlantHaworth, NJ 208-MGD(10 units – 16 gpm/ft2)
ApplicationsDrinking Water: 26
23 Standard Clarification3 Membrane Pretreatment
Wastewater: 31 DW Membrane BWW1 BAF BWW1 Tertiary phos.
*Map not up to date
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Key Benefits:
>85% algae removalReduce taste and odor
<0.2 mg/L TP
No polymerProtect membranes
Save materialSmaller Building
0.1 – 2.5 MGD / UnitPiloting experts
>100 DAF units400-MGD N.A Capacity
1. Algae Removal
2. Phosphorus Removal
3. Membrane Pretreatment
4. High loading rate : small footprint
5. Package Units and Piloting
6. Experience
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Lake Deforest, NY20-MGD, 2 units, Drinking Water
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Scottsdale, AZ25-MGD, 2 units, Membrane Pretreatment
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South San Joaquin, CA46-MGD, 4 units, Membrane Pretreatment
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Haworth, NJ208-MGD, 10 units, Drinking Water
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Haworth, NJ208-MGD, 10 units, Drinking Water