OR-TEC - Flotation Systems

The OR-TEC DAF is available in stainless steel, epoxy coated or plastic tanks.

Weighed down with heavy oil and grease removal problems? OR-TEC has a simple and extremely cost effective solution: Our HF Series Flotation System. The HF Series is uniquely designed for the removal of fat, grease and suspended solids from food, industrial and municipal wastewater. It automatically isolates these materials from the liquid waste, making them suitable for separate disposal while increasing plant performance. The removal of these materials greatly decreases pollution loadings and makes the effluent suitable for disposal to public sewers. In addition, the high oxygen transfer rate facilitated by the special aerator provides for oxidation of sulfides.

NOT required with the OR-TEC DAF Series Flotation System:

• Air compressors
• Pressure vessels
• Complicated pressure and flow controls

OR-TEC DAF models are available for flow rates up to 660 gals/min. Special designs for higher flow rates can also be provided.

• Optimal treatment
• No blocking problems
• Streamlined running costs
• Reduced capital costs
• Maximized performance
• Low maintenance

The OR-TEC Flotation System will include the following items:

• Flocculation System (For chemical/effluent mixing, coagulation and flocculation)
• Aeration Zone (for aerating, mixing and fusing the air bubbles to the flocculation waste stream)
• Flotation Zone (to ensure sufficient retention to allow for separation and flotation of solid material from the waste stream)
• Solids Discharge Scrapers (to direct the skimming to the auger discharge)
• Discharge weir and channel (for final effluent)

The OR-TEC DAF System is designed to reduce FOG, BOD, COD and TSS. It can be supplied with pH correction equipment, and coagulant dosing equipment if necessary. In most cases the system uses an OR-TEC Blend Polymer Dosing system which automatically makes up polymer and doses it as needed into the wastestream to create flocculation. The polymer solution and waste travel though a serpentine which aids in the flocculation process.

Prior to entering the DAF tank a cavitation aeration pump uses recycled water to create and inject perfect whitewater into the flocculated wastestream. This combination of whitewater and flocculated solid particles in the wastestream cause those particles to float. Floated solids are removed using a variable speed scraper system which skims the surface of the tank. These solids are removed to the side of the unit for disposal. Settled solids are removed by augers, scrapers or bottom dump valve depending on the model selected.

Treated effluent flows from the flotation zone via pipes to a double weir chamber. The double weir chamber minimizes flow velocity which helps stabilize the liquid level in the DAF flotation zone. This ensures that the top float scrapers are effective at all times. From the weir chamber the majority of the flow will discharge to the outlet chamber and, from there, to the city sewer. A smaller portion of the flow is recycled back to the DAF`s whitewater/aeration system.