The Komline-Sanderson Dissolved Air Flotation Clarifier is designed for the removal of suspended solids or water immiscible liquids from process or wastewater to produce an effluent of high clarity and free of objectionable particles or liquid. Dissolved air flotation is best applied to remove materials that normally settle slowly, persist by remaining in suspension, or have a tendency to float.
- Aircraft Maintenance
- Algae Removal
- Automotive Industry
- Bakery Waste
- Ballast Water
- Chemical Processing Plants
- Fiber Recovery
- Heavy Metal Recovery
- Meat Packing
- Paint Waste
- Pet Foods
- Potato Processing
- Poultry Processing
- Prepared Foods
- Pulp and Paper Mills
- Seafood Processing
- Slaughter House
- Tank and Truck Cleaning
- Vegetable Oil
How does it work?
Dissolved Air Flotation (DAF) is a process for the removal of fine suspended material from an aqueous suspension. The term "flotation" indicates something floated on or at the surface of a liquid. The DAF provides the energy for effective flotation in the form of extremely fine air bubbles, which become attached to the suspended material to be removed. This attachment of bubbles to the particle "reduces" the density of the particle resulting in increased buoyancy, thus effecting flotation. Chemical conditioning is often used to increase the effectiveness of the dissolved air flotation process. The most reliable and positive method of producing bubbles of the proper size is to dissolve air into water under pressure and to then reduce the pressure of the solution. As the pressure is reduced, the air comes out of solution in the form of microbubbles.
- Wastewater is pretreated with chemicals.
- Treated influent is fed to DAF unit.
- Recycle is drawn off effluent line and is sent through the air dissolving system and then sent back into the DAF.
- Air is released from the recycle flow and the bubbles help to float solids in the DAF tank.
- Float is skimmed from the top of the tank.
- Clear effluent flows out of the unit.
How do I know if a K-S DAF is right for my process?
Does your process involve:
- Clarification of a wastewater stream
- Reduction of TSS, COD, and BOD to meet effluent discharge limits
- Recovery of suspended material
- Reclaiming water for reuse
- Thickening of slurries and sludges
Are you interested in:
- Minimal operator attention
- Low maintenance time and expense
- A well-built machine offering long equipment life
If you can relate to these objectives, then follow these steps:
- Establish influent and required effluent conditions as accurately as possible
- Complete the K-S Applications Questionnaire
- Contact us to assist in making a preliminary selection
- Perform lab and/or pilot scale testing if necessary
- Make final selection
- What is immediately upstream and downstream of the DAF?
- What is most important: floated solids concentration, effluent clarity, capital or operating cost, etc.?
- What have you tried before? Why did/didn't it work?
- What materials of construction are acceptable? What are not?
- Do you need auxiliary equipment, such as chemical pretreatment, for example?
- Do you need any instrumentation or controls?
- Do you have any standard specifications?
There are many factors affecting the operation of a clarification process. Among these are chemical pretreatment; power, water, air, or other utilities; operator attention; cleaning requirements; and maintenance needs. All of these should be considered when selecting a wastewater clarification system.