The high-efficiency shallow air flotation device is an advanced air flotation device that, to a certain extent, changes the static water inlet and dynamic water outlet of the air flotation into dynamic water inlet and static water outlet, that is, the mixed sewage containing suspended particles with microbubbles is When entering the air flotation tank, the outflow device is moved, and the horizontal flow rate of the mixed wastewater is lower than that of the outflow device, thereby suppressing the turbulence in the tank. Therefore, smooth air flotation separation can be performed, and the flotation body's rising speed reaches or It is close to the theoretical rising speed, improves the treatment efficiency, reduces the residence time of wastewater in the shallow air flotation tank from the traditional 30 to 60 minutes to 3 minutes, and integrates coagulation, skimming, drainage and mud discharge into one. An efficient wastewater treatment device. The overall shape is cylindrical, the structure is compact, and the pool is shallow.
The main body of the high-efficiency shallow air flotation device is mainly composed of five parts, the pool body, the rotating water distribution mechanism, the melt gas release mechanism, the frame mechanism, the 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, and dissolved air release mechanism are all closely connected with the frame and rotate around the center of the pool body. This device provides a complete set of equipment assembly and control system, which combines centralized control and decentralized control to achieve the best operating status of the equipment.
Shallow air flotation will introduce air into the water, which will produce fine bubbles, which will cause the fine suspended solids in the water to adhere to the air bubbles and float to the surface of the water with the bubbles to form scum, thereby removing suspended solids from the water. , the purpose of improving water quality.
The smaller the diameter of shallow air flotation bubbles, the greater their number, and the better the air flotation effect when used. The inorganic salts in the water will accelerate the bursting and merging of bubbles, reducing the air flotation effect; adding coagulation The agent will promote the agglomeration of suspended matter, causing it to adhere to the bubbles and float. Flotation agents can be added to convert the surface of the hydrophilic particles into hydrophobic substances, which will adhere to the bubbles and float with the bubbles.
Classification of shallow air flotation
1. Electrolysis flotation: During operation, it uses electrolysis to continuously generate hydrogen, oxygen and other micro-bubbles in the two electrode areas. Suspended particles in the wastewater adhere to the bubbles and float to the water surface to be removed. The process is simple, the equipment is small, but the power consumption is large.
2. Diffused air flotation method: It is a process in which air is distributed in the sewage in the form of tiny bubbles after passing through a micropore diffusion device or microporous tube or impeller for air flotation treatment.
The separation of suspended oil and emulsified oil by shallow air flotation can, to a certain extent, replace the secondary sedimentation tank of the activated sludge method for solid-liquid separation of the aeration tank outflow mixed liquid, and can separate useful substances (such as pulp) in industrial wastewater. ), which can separate substances that exist in molecular or ionic states (such as metal ions, surface-active substances, etc.).
