Aquosys Co
Model Heliflot -Dissolved Air Flotation (DAF)
FromAquosys Co
Helical flow type dissolved air flotation unit HELIFLOT which was developed by AQUOSYS is a high-efficiency suspended solids flotation separator that has acquired patents in 13 countries including the United States as well as Korea by adopting an innovative principle. This unit can be applied to almost all fields of water treatment such as tap water, sewage, and wastewater. And it shows high treatment efficiency with a small-size facility for removing suspended solids, surfactants, oil, and TOC in water.
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DAF is a water treatment technology that purifies water by removing suspended matter through the use of fine bubbles from dissolved air.
Advantages and disadvantages of DAF compare to Sedimentation
Advantages
- High speed treatment
- Produces thick sludge
- Shorter flocculation detention time
- Shorter start-up lead time
- Compact facilities required
- Omissible for recovered sludge thickener
Disadvantages
- Requires more complex facilities
- Consumes more electrical power
- Unsuitable for highly silt-laden water
- HELIFLOT™ is a cylindrical DAF unit that runs with helical flows, developed by Aquosys.
- Raw water and fine bubbles are fed into the flotation tank (?) by an inflow pipe connected to the tangent (?).
- Suspended materials form flocs with fine bubbles, creating a helical flow with the water to move upwards (?) and gather around the center of the water surface (?). The flocs are discharged out of the flotation tank through a scum outflow pipe (?).
- The treated water then creates another helical flow to move downward (?) inside of the helical flow moving upwards.
They are then discharged continuously out of a treated water outflow pipe (?). - The water level of the flotation tank is controlled with a flow control valve (?) suitable for scum control.
- Silt or something dense moves to an outer position on the flotation tank by centrifugal force. It settles down to the conical bottom and then evacuates to the outside periodically (?).
