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Dissolved Air Preparation Stage
The core of DAF begins with the preparation of dissolved air water. Air is introduced into a pressurized water body through a dissolved air system. Under specific pressure, the air gradually dissolves in the water, forming saturated dissolved air water. This process requires ensuring water cleanliness to avoid large particles or excessive pollutants affecting air dissolution efficiency, while maintaining the stability of the dissolved air environment to ensure that the air is fully integrated into the water, laying the foundation for subsequent air flotation separation.
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Microbubble Release Stage
When the saturated dissolved air water passes through the dissolved air release device, the pressure drops sharply, causing the dissolved air in the water to rapidly precipitate, forming a large number of fine and uniform microbubbles. The structural design of the release device determines the bubble morphology. A high-quality release device can produce bubbles with small particle size and good dispersion. These microbubbles have a large specific surface area, which can efficiently capture suspended particles and colloidal substances in the water.
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Bubble Adsorption and Binding Stage
Microbubbles come into full contact with suspended impurities and colloidal particles in the water, adsorbing onto the particle surface through surface tension. After the air bubbles combine with the particles, they form an air flotation body with a specific gravity less than water, disrupting the original settling equilibrium of the particles. During this process, the water body needs to maintain a suitable flow state to ensure sufficient collision and combination of air bubbles and particles, avoiding situations where excessively fast or slow water flow affects the adsorption effect.
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Solid-Liquid Separation Stage
The air flotation body adsorbed with microbubbles floats upwards due to buoyancy, eventually accumulating on the water surface to form a scum layer. The scum is continuously scraped off by a scraper, achieving the separation of pollutants from the water. The clean water, freed of suspended impurities, sinks under gravity and is discharged through the effluent system, completing the entire solid-liquid separation process and achieving the purpose of wastewater purification.
The DAF process demonstrates an efficient physical-chemical method for water treatment, utilizing microbubble technology to achieve effective separation of suspended solids and colloidal particles from wastewater.
