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Retrofit Your Existing DAF with a SAF™ Generator

Model F200 Replacing a DAF Pressurization System - Heron Innovators
MODEL F200 replacing a
DAF pressurization system
DAF overloaded with solids? Tired of high sewer bills? Tired of cleaning out your DAF every week? Then do what snack food manufacturer Wyandot Inc. did - Retrofit your DAF with a SAF™ Generator! With an average flow rate of 125 gpm of process wastewater, Wyandot was only achieving 50% solids removal with their overloaded DAF. Now, with a Suspended Air Flotation (SAF™) retrofit, solids removal is consistently above 92%, and they are saving $21,000 per month on their sewer bill.
  • SAF™ replaces the existing DAF pressurization / recirculation system.
  • SAF™ will increase existing DAF capacity significantly, without the cost and logistical obstacles of a new installation.
  • SAF™ will use significantly less power than the replaced DAF Recirculation system.
  • SAF™ will remove more solids than the replaced DAF was capable of.
  • SAF™ retrofit will be more flexible to operate than the replaced DAF.
  • SAF™ is more cost-effective to operate than the replaced DAF.
Here’s How
  • Establish a froth injection point at a location on the DAF influent line that provides adequate mixing…i.e. prior to a 90 degree elbow or within a serpentine contact chamber.
  • Locate a place to stage the SAF™ Generator. Yes, it can be remotely located; but the closer the better.
  • Provide potable water and electricity or compressed air as required.
  • Allow space to place a container of surfactant, and provide 110v power for an LMI Pulsed Diaphragm Metering Pump (or equivalent).
  • Turn off the existing DAF Recirculation / Pressurization System.
Operation
  • A signal will need to be provided to start the generator. This signal can be manual or a high level switch from an equalization tank.
  • The SAF™ Generator will warm up for a period of 45 – 60 seconds prior to releasing froth to the process. During this period, wastewater should not be allowed to enter the flotation tank.
  • The SAF™ Generator Control Panel can provide a signal to start wastewater flow when the warm-up phase is complete and the SAF™ Generator begins feeding froth to the flotation system.
  • The same signal that starts wastewater flow can be used to start polymer feed, water, chain and flight skimmers, and downstream dewatering system and/or pumps.
  • The flotation system can be turned off either manually or automatically by a low level switch located in the equalization tank.

Operational Costs
  • Surfactant normally costs <$0.03 per thousand gallons of wastewater treated.
  • Power to run the SAF™ generator depends on suspended solids content in the wastewater; typically less than $0.10 per thousand gallons treated.
  • Normally these costs are less than the cost of power consumed by the existing DAF recirculation / pressurization system
Options
  • Serpentine Contact Chamber can be provided, allowing 30 seconds contact time and mixing for polymer and froth addition.
  • Dewatering Conveyor can be provided to condition floated solids to the point were there is no free-draining liquid.

Retrofit Your Existing DAF with a SAF - Heron Innovators

SAF™ Generator Sizing
Wastewater Suspended Solids (mg/L)
  500 1000 1500 2000 2500 3000 3500 4000 4500 5000
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Model Suspended Air™ Emulsion Generator Wastewater Flow Rating (gpm)
F2 50 50 25 25 16.7 15 12.5 12 10 10 8.3 8 7 7 6 6 5.6 5 5 4
F8 200 200 100 100 66 60 50 50 40 40 33 30 29 28 25 25 22 20 20 15
F25 634 600 317 300 209 200 159 150 127 120 105 100 91 90 80 75 70 60 63.4 45
F50 1268 1250 634 600 418 400 317 300 254 250 209 200 181 175 159 150 141 125 127 100
F100 2536 2500 1268 1200 837 800 634 600 507 500 418 400 362 350 317 300 282 250 254 200
F200 5072 5000 2536 2400 1674 1600 1268 1200 1015 1000 837 800 725 700 634 600 564 500 507 400



pdf file Retrofit DAF Brochure (.pdf 80 kb)

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