Process flow and principle of air flotation machine

Air flotation machine is a device that removes grease and other easy-to-float surface solid particles while reducing BOD and COD

Air flotation equipment is used to remove grease, oil, and other solid particles that are easy to float on the surface, while reducing the BOD and COD content. The air is dissolved in the water to form microbubbles, and the air and water are fully integrated to produce microbubbles attached to the solid particles. surface. Solid particles that are lighter than water float on the surface and are dispersed throughout the area to achieve a sufficient separation effect. Equipped with a mechanical mud scraper to remove scum, and the purified water is discharged to the next treatment process.

The air flotation machine is a dissolved air system that generates a large number of fine bubbles in the water, so that the air is attached to the suspended particles in the form of highly dispersed tiny bubbles, resulting in a state where the density is less than that of water. The principle of buoyancy is used to make it float on the water surface to achieve solidification. -Liquid separation water treatment equipment.

Process flow and principle

1. The raw water enters the mixing reactor, and the medicament (degreaser or coagulant) is added to the mixing reactor to form separable flocs;

2. The pretreated sewage enters the air flotation device, and the tiny bubbles (bubble diameter range 30-50um) released in the sewage and air-water mixture in the inlet chamber are mixed. These tiny bubbles adhere to the flocs in the sewage to form an air float with a specific gravity less than water. The air flotation body rises to the water surface to condense into oil slick (or scum), which is scraped by the oil (slag) scraper to the oil (slag) tank;

3. The heavier solid particles in the inlet chamber are deposited here and discharged through the sand discharge valve. The system requires that the sand discharge valve be opened regularly to keep the inlet chamber clean;

4. Sewage enters the water distribution area of the air flotation device, and the rapidly rising particles will float to the water surface; the slower rising particles are separated in the corrugated inclined plate. Once a particle touches the corrugated inclined plate, it can reverse under the action of buoyancy. Rise in the direction of the current;

5. All heavy particles will sink, and the sinking particles will be collected by the bottom scraper and discharged by regularly opening the mud valve.