Rotary Mixer Disc Diffuser Structure, Working Principle and Technical Specification
By: Kate Nana
Post Date:November 12th, 2025
Post Tags:Aerators, testing,warehousetour,aeration,Rotary Mixer Disc Diffuser
1. Overview of Rotary Mixer Disc Diffuser
In aerobic wastewater treatment processes, microorganisms decompose organic pollutants in water to achieve purification. The biochemical activity of these microorganisms requires an oxygen source, which is provided by the diffuser. The function of the diffuser is to disperse the air delivered by the blower through pipelines into the water, supplying the oxygen needed by microorganisms.
When air bubbles contact the water, a gas-liquid interface is formed—this is the site of oxygen transfer. The greater the number of bubbles generated per unit volume of air, the larger the gas-liquid contact area, and thus the higher the oxygen transfer efficiency. Therefore, the number of bubbles produced by the diffuser directly affects oxygen transfer performance.
At present, both domestic and international fine-pore diffusers mainly adopt the "micro-pore diffusion" technique. When air passes through micro-pores, fine bubbles can be produced, but this method has several inherent drawbacks:
1. High exhaust resistance loss.
2. Pore clogging tendency.
3. Strict dust filtration requirements for the inlet air source.
4. Limited durability and reliability of the diffuser.
The Rotary Mixer Disc Diffuser overcomes these limitations. Through swirling, obstruction, and collision effects, air bubbles with significant buoyant force are sufficiently broken up, achieving the fine-bubble aeration effect using a large-orifice exhaust design. This concept completely eliminates the dependency on “micro-pore structures” to generate fine bubbles.
By adopting a large-orifice discharge method with dynamic diffusion to form fine bubbles, the Rotary Mixer Disc Diffuser offers the following advantages:
1. Low exhaust resistance loss
2. Clog-free operation
3. High efficiency
4. Maintenance-free and replacement-free performance
Additionally, it features a built-in check mechanism and automatic high-speed exhaust function for superior reliability.
2. Structure and Working Principle
The Rotary Mixer Disc Diffuser mainly consists of:
Connection nozzle
Rotary mixing core (flow-splitting ring)
Interlayer diffusion tooth cover
Inverted-tooth diffusion cap
Air main pipe
Air branch pipe
Horizontal adjustment bracket
Air drainage and cleaning device
Air enters the diffuser through the air distribution pipeline. The airflow causes the rubber check valve to oscillate up and down, adjusting the gap dynamically. Then, the air passes through the diffusion teeth of the flow-splitting ring, the upper and lower interlayer tooth covers, and the inverted-tooth diffusion cap.
During this process, the rising air bubbles undergo multiple collisions and fragmentation under dynamic diffusion, forming uniform fine bubbles throughout the water column.
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