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Equipment features of Dissolved Air Flotation(DAF)

Feb 07,2024

Dissolved Air Flotation (DAF) is a water treatment process that removes suspended solids, oils, and other contaminants from wastewater. It utilizes the principle of flotation, where tiny air bubbles are introduced into the water to attach to the suspended particles, causing them to float to the surface for removal´╝Ü

1. Clarifier Tank: This is the main component of the DAF system, where the flotation process takes place. It is a large tank that allows the water to slow down and provides sufficient residence time for the air bubbles to attach to the particles.

2. Coagulation/Flocculation System: Prior to the DAF process, chemicals are often added to the wastewater to aid in the coagulation and flocculation of the suspended particles. Coagulants help bind the particles together, while flocculants form larger flocs that are easier to remove.

3. Air Dissolving System: To generate the tiny air bubbles required for flotation, an air dissolving system is used. This system typically consists of an air compressor, a pressure vessel, and a pump to inject the dissolved air into the water.

4. Skimming System: Once the particles have floated to the surface, they need to be removed from the tank. A skimming system is employed, which includes a scraper mechanism or a rotating drum that collects the floating material and transfers it to a separate collection tank.

5. Effluent Collection System: The clarified water, free from suspended solids, is collected and discharged through an effluent collection system. This system ensures that the treated water is properly removed from the DAF unit.

6. Control System: DAF systems often incorporate a control system to monitor and regulate various parameters such as flow rate, air-to-solids ratio, chemical dosing, and skimming speed. This allows for optimal performance and efficient operation of the equipment.

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