Understanding the Principle and Function of Dissolved Air Flotation (DAF)

In modern industrial wastewater treatment, efficiency and clarity are paramount. Among the various technologies available, the Dissolved Air Flotation (DAF) system stands out as one of the most effective methods for removing suspended solids, oils, and grease from process water. As a leader in environmental solutions, Huariton provides advanced DAF systems designed to meet rigorous discharge standards.

What is a DAF System?

A Dissolved Air Flotation system is a water treatment process that clarifies wastewaters by the removal of suspended matter. The removal is achieved by dissolving air in the water under pressure and then releasing the air at atmospheric pressure in a flotation tank or basin.

The Core Working Principle

The effectiveness of a DAF system relies on the physical properties of micro-bubbles. Here is the step-by-step process:

1. Saturation: A portion of the clarified effluent is recycled and pumped into a pressure vessel (the air saturation tank). Here, compressed air is introduced, forcing the air to dissolve into the water.

2. Release and Bubble Formation: This "saturated" water is then discharged into the flotation tank through a specialized release valve. As the pressure drops to atmospheric levels, the dissolved air comes out of the solution in the form of millions of tiny micro-bubbles (typically 10 to 30 microns in diameter).

3. Attachment: These micro-bubbles attach themselves to the suspended solids (SS) and chemical flocs present in the raw wastewater.

4. Flotation: The buoyancy of the bubbles lifts the particles to the surface of the tank, forming a concentrated layer of sludge known as "scum."

5. Skimming: A mechanical skimmer continuously removes the surface scum into a collection hopper, while the clarified water is discharged from the bottom of the tank.

Key Functions of Huariton DAF Systems

• Removal of Total Suspended Solids (TSS): Efficiently reduces the cloudiness of water by capturing fine particulates.

• Oil and Grease Separation: Ideal for food processing and petrochemical industries where "Free" and "Emulsified" oils must be removed.

• BOD/COD Reduction: By removing organic suspended solids, the biological and chemical oxygen demand of the water is significantly lowered.

• Thickening of Sludge: DAF systems are often used to concentrate biological solids, reducing the volume of waste for further treatment.

Why Huariton?

Huariton DAF systems are engineered for stability and low energy consumption. By optimizing the air-to-water ratio and using high-efficiency stainless steel components, we ensure that our clients achieve maximum water recovery and minimize operational costs. Whether for municipal or industrial applications, Huariton remains committed to delivering "Clear Water, Green Future."