The effective water depth of shallow air flotation is 400~500mm. The hydraulic retention time in the pool (3~5min). The purification capacity is large, that is, the surface load is high. Shallow air flotation has a small footprint, light unit load, all prefabricated components are assembled, no operating room is required, the equipment can be installed overhead, and can also be combined in multiple layers. Low installation and maintenance costs, easy to clean. Shallow air flotation has a high degree of purification, and the removal rate of suspended solids is over 90%. It has an ingenious structure, its air-dissolving efficiency is as high as 90%, and its volume is only one-fifth of the general air-dissolving system.
The air flotation separation technology of shallow air flotation refers to the air and water under certain pressure conditions, so that the gas can be dissolved into the water to the maximum extent, and strive to be in a saturated state, and then the formed pressure dissolved air water is decompressed. Release, produce a large number of fine air bubbles, fully contact with the suspended flocs in the water, make the suspended flocs in the water adhere to the micro air bubbles, float to the water surface together with the air bubbles, form scum and scrape off the scum, thereby purifying the water quality.
Shallow air flotation is an advanced fast air flotation system. On the basis of traditional air flotation theory, it has successfully applied the "shallow layer theory" and "zero speed" principle. It is an efficient equipment for water purification treatment, which integrates slag, sedimentation and mud scraping.
The raw water of shallow air flotation flows in from the central pipe at the bottom of the pool after flocculation and mixing, and the scum on the water surface is collected by a skimmer, and then discharged into the central sludge tank, and then discharged into a matching sludge device, and the scum that sinks at the bottom of the pool The sludge is collected by the scraper and discharged to the sludge discharge tank, and the clean water is collected and discharged by the central water collection mechanism. Raw water with good flocculation refers to the raw water formed by adding flocculation agent PAC or PAM (PAC is 400-1000mg/I, PAM is about 1/5 of PAC) in the raw water, and after 10-15 minutes of effective flocculation reaction. The specific dosage, flocculation time and flocculation effect must be determined by experiments.
The shallow air flotation device integrates coagulation, air flotation, scum skimming, sedimentation, and mud scraping. The whole is cylindrical, with a compact structure and a shallow pool. The main body of the device is composed of five parts: pool body, rotating water distribution mechanism, dissolved air release mechanism, frame mechanism, water collection mechanism, etc. The water inlet, water outlet and scum discharge outlet are all concentrated in the central area of the pool body. The water distribution mechanism, water collection mechanism, dissolved air release mechanism and the frame are closely connected together and rotate around the pool body.
Shallow air flotation means that the concentrator drives the small sprocket through the deceleration motor, so that the large sprocket drives the worm gear to rotate, and the scraper arm and scraper scrape the sludge to the sludge collection pit in the center of the pool with the rotation of the main shaft. The mud is automatically discharged out of the pool through the mud discharge pipe at the bottom of the pool.
