I. Product Structure and Specifications/Materials:
Fiberglass Reinforced Plastic (FRP). Service Area: Installed in push-flow and fully mixed aeration tanks, each unit serves an area of 0.8-1.5m².
Oxygenation Efficiency: At a water depth of 4m, oxygen transfer efficiency η=8-9%, oxygenation capacity 0.3-0.41 (kg oxygen/hour·unit).
Specifications: Φ400, Φ600. 
II. Structure and Oxygenation Principle:: 
Structure: 
1. Serrated air distribution head, similar in structure to Jinshan Type I. Its function is to cut and disperse air, with diameter D=100 mm, height H=120 mm, and 18 serrations. 
2. Diffuser cover with serrations, designed in an inverted umbrella shape. At the center of the umbrella, there are 12 Φ12 aeration holes to supplement air and further evenly distribute it across the entire diffuser cover, reducing energy consumption, evenly mixing water and air, and lowering the requirement for installation levelness. The diffuser cover diameter D=600 mm, with 60 downward slightly inclined serrations around the perimeter to further cut bubbles. 
Oxygenation Principle: 
As mentioned above, the main factors affecting the oxygen transfer rate are: turbulence in the aerated water body, mixing, bubble diameter, air volume, and the partial pressure of oxygen in the liquid phase, etc. 
The Φ600 diffuser aerator primarily achieves oxygenation through the following mechanisms: 
1. Intense mixing of liquid: Gas is transported through pipes to the aerator, passes through a Φ25 inner hole and the serrated air distribution head, undergoing the first cut of water and gas. After being distributed by the diffuser cover and cut again by the surrounding serrations, it drives the surrounding static water upward. The energy difference causes intense mixing of gas and liquid. Additionally, since the aerators are distributed at the bottom of the tank, the rising bubbles from aeration counterflow with the descending water current, further enhancing gas-liquid mixing and accelerating the renewal of the water film at the gas-liquid interface. 
2. After two serrated cuts and gas-liquid mixing, the bubble diameter decreases, increasing the gas-liquid contact area and facilitating oxygen transfer. 
3. Diffusion effect of the diffuser cover: The diffuser cover spreads the concentrated stream of gas into a cylindrical shape, altering the air distribution state at the bottom of the tank, increasing the distribution area, and intensifying the diffusion of bubbles at the bottom and the mixing of gas and liquid, further promoting aeration and oxygenation. 
The difference between the diffuser aerator and Jinshan Type I lies in the secondary cutting and dispersion of the airflow, thereby expanding the air distribution range and altering the flow pattern within the tank. Unlike fixed spiral aerators, the device height is significantly reduced, the air distribution range is larger, and the mixing effect at the tank bottom is greater, resulting in superior oxygenation performance.