Air floating sedimentation machine structure principle and advantages

Air flotation machine

First, the structure of air flotation and precipitation machine

The air flotation and sedimentation machine mainly includes an air floating casing body, an aerator, a chain scraping system, a dross collecting system, an electric control system, a medicine filling irrigation, a dispensing irrigation, a dosing pump, and a console.
　　
Second, the working principle of air flotation and precipitation machine
Untreated sewage into the first aeration chamber containing the aerator, the sewage generated micro air bubbles mixed with the flotation machine in process of rising, the aerator air ventilation tubes were transferred to an underwater surface by The aerator uses a high-speed rotation of the bottom diffuser impeller to form a vacuum zone in the water. The air on the liquid surface is filled in by the aerator inlet water, and the micro-bubbles are generated, and spirally rises under the strong agitation of the impeller . On the surface of the water, oxygen in the air also enters the water.
Adding polyaluminum chloride and polyacrylamide before the aerator, due to the action of the drug, destroying the stability of the colloidal particles in the water, promoting the colloids to contact each other, forming flocs, using the vortex swirl of the aeration chamber , and densely formed small bubbles form an organic combination, as the 'flocs' rise in the aeration chamber and form larger flocs. The floc is separated from the water and solid liquid and enriched in the water surface. Under the driving of the water flow, the scraper pushes the suspended matter along the liquid surface to the sludge discharge pipe , and the purified sewage enters the overflow before the discharge through the outlet below the metal plate. groove. The overflow tank is used to control the water level of the air flotation to ensure that the liquid in the air floating tank does not flow into the sludge discharge pipe.
Third, the advantages of air flotation and precipitation machine
1. Save investment
The air flotation and sedimentation machine does not require auxiliary equipment such as pressure dissolved gas tanks, air compressors, and circulating pumps. The device is capable of removing grease, gums, solids suspended solids, COD and BOD from sewage.
2. High efficiency
The equipment has a SS removal rate of 93-95% in sewage ; COD and BOD is as high as 90 %, and a large amount of fibers, grease and the like are removed.
3. Low operating costs
According to the different amount of treated water, the number of aerators is determined . Each aerator is only 1.5kw, and the scraper motor is only 0.75KW. The whole air flotation and precipitation machine consumes very little power, which is only equivalent to the traditional dissolved air flotation. 1/5-1/8, and low maintenance costs, less manual operation, no manual guard during normal operation.
4. Odor reduction
The treatment of wastewater by the air flotation and sedimentation machine itself is an aerobic process, and the sludge is removed in a “fresh” state, without the activated sludge method, biofilm method, gravity sedimentation tank, etc. Problems such as odors have greatly improved the working environment of workers.
5, small footprint
The installation area of ​​the air flotation equipment with a processing capacity of 5-500 cubic meters per hour is only 10-110 square meters.
6. Easy to install
There are few projects for the air flotation and sedimentation machine , and the ground and high places can be installed, occupying a small space.