Dissolved Air Floatation Cells

Wastewater Resources Dissolved Air Flotation systems are designed for wastewater compliance and recovery. WRI builds Dissolved Air Flotation (DAF) systems to treat wastewater, to reduce suspended solids, oils and grease, metals, BOD, COD and VOCs. Coupled with one of WRI's membrane systems, the effluent normally discharged can become an alternative source for plant process water. A WRI DAF can:

• Comply to regulatory limit
• Reduce sewer surcharge costs
• Remove up to 80% of the suspended solids as a waste sludge
• Create an effluent suitable for further polishing and reuse

Wastewater Resources, Inc. of Scottsdale, Arizona is a specialized manufacturing and design firm which works only in the area of water treatment and wastewater treatment and reuse. The company designs, manufactures, installs and/or operates systems on a turnkey basis. WRI Systems and Services Provide:

• ˆ Turn Key System »» WRI Installs System And Trains Operators
• ˆ Low Maintenance Requirements »» Automated And Controlled From One Panel
• ˆ Low Cost of Ownership »» Low Chemical Consumption Design

Description:

The waste water is delivered to the DAF tank via a transfer pump. An ASME rated aeration vessel transfers some of the recirculated waste water flow into the vessel where air is injected, pressurized, and dissolved then returned to the DAF inlet along with the influent waste water. A flocculant polymer compound is added at the inlet stream. Adding the chemical to the wastewater influent of the DAF allows precise injection of controlled amounts of air and floc under well defined process conditions which cuts down chemical costs.

The waste water is saturated with finely dispersed microscopic air bubbles. The bubbles attach themselves to the flocculated particles. They rise to the top where an upper scraper arm removes the particles to a solids storage tank. An optional lower rake arm in the DAF can move heavier settled solids at the bottom of the DAF to the solids storage tank. The skimmed and raked solids are ready to be dewatered.

The clean, treated water can be discharged in compliance, or "polished" with a WRI membrane system for further treatment or reuse in the plant. The entire system will be balanced and controlled by a microprocessor from one control panel.

Treatment Train:

The steps involved to remove suspended solids and recover waste water:

 
• 1. Raw water pump
• 2. Air injection from air vessel
• 3. Chemical injection
• 4. DAF skimmer and rake
• 5. Discharge water and sludge

Shown above....A rectangular WRI DAF with integrated control center, holding tank, and mutimedia filter.