Shallow Air floatation Wastewater System achieves efficient solid-liquid separation through unique design and work flow.
1. Dissolved air
After being compressed by the air compressor, the air enters the air dissolving tank and mixes with water. The air dissolving tank maintains a high pressure, which causes a large amount of air to dissolve and form dissolved air water. This process is similar to the principle of soda production. The high pressure ensures the high solubility of air in water.
The dissolved air water enters the flotation tank through a specially designed releaser. The sudden drop in pressure causes the air in the dissolved air water to be released in the form of tiny bubbles, with a bubble diameter of usually tens of microns. These tiny bubbles have a large specific surface area, providing good conditions for subsequent combination with suspended particles.
2. After the sewage flows into the flotation tank
Impurities such as suspended particles, grease, and colloids in water meet bubbles. Since the surface of suspended particles often carries an electric charge or has hydrophobic properties, bubbles can attach to them. For example, the surface properties of oil droplets in oily wastewater are conducive to the attachment of bubbles. Once combined, the overall density they form is less than that of water, and they rise rapidly under the action of buoyancy.
The shallow flotation tank is designed to be shallow, with a water depth of 0.5-0.9 meters. Compared with the traditional flotation tank, this shallow tank structure greatly shortens the floating distance and time of particles, allowing the suspended particles combined with bubbles to quickly reach the water surface. Its hydraulic retention time can be greatly shortened to 10-30 minutes, while the traditional sedimentation method may take several hours.
3. Subsequent processing
The scum floating to the water surface is scraped and collected by the scraper for subsequent treatment, and the purified water is discharged from the drain at the bottom of the flotation tank. During the whole process, each link is closely connected and cooperates with each other. The dissolved air link provides the basis for the generation of suitable bubbles, the gas release link accurately releases tiny bubbles, the flotation link takes advantage of the shallow pool for rapid separation, and the scraping and drainage links complete the final solid-liquid separation. Through such a collaborative system, shallow flotation can achieve efficient solid-liquid separation in wastewater treatment and water resource recycling in many industries such as papermaking, printing and dyeing, and chemical industry, improve treatment efficiency, reduce floor space, and ensure good effluent quality.
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