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Vortex concave type series air flotation machine, it is by our company on the basis of the introduction of American technology to improve the design of new sewage treatment equipment, won several national patents, its design is reasonable, manipulate it, run the economy, it is made of micro air bubble aerator, directly to remove suspended solids from the wastewater. Eddy concave aerator will "micro bubbles" directly into the sewage in line and don't need to improve predecessors dissolved air, and then through the perforated impeller average distribution of the micro "bubble" in sewage, so the whole operation process does not happen obstruction phenomenon, more do not need to pressure dissolved air pump equipment, air compressor and rebirth. First improve the predecessors of raw sewage into the dosing reaction zone, and then into the aeration zone and good contact with micro bubbles, CAF vortex concave air floating machine features: the micro air bubble is on the rise in the process of suspended solids float to the surface of slag scraper run along the liquid surface will be suspended to tilt 45 degrees of inclined plate, and then pushes it into the sludge discharge pipe groove, through the sludge discharge pipe groove into the sludge collection area. Sewage purification before emissions will through the inclined plate at the bottom of the overflow groove, the overflow tank is used to control water of air flotation machine, ensure the liquid tank into the sludge discharge pipe, open throat flow pipe from the aeration period of stretch across the bottom of the air floatation tank.