What are the working principles of submersible aerators?

Principle of centrifugal aerator

The submersible centrifugal aerator is directly driven by a motor and an impeller, using the centrifugal force generated by the rotation of the impeller to discharge the surrounding water and form a low-pressure zone for sucking in water flow. At the same time, a vacuum is created at the inlet of the impeller to suck in air. In the mixing chamber, air and water are fully mixed to form a uniform air-water mixture, which is quickly discharged under the action of centrifugal force.

Due to the water jet *, effective water circulation is created, causing the air to be sheared into a large number of tiny bubbles. Greatly increasing its surface area, and due to the slow rise of bubbles, a large amount of oxygen in the air dissolves in water, making the power efficiency of this machine superior to other types of aerators.^[1]

Principle of Jet Aeration Machine

The submersible jet aerator generates a high-speed water flow through the nozzle by the water flow generated by the submersible pump. Negative pressure is formed around the nozzle to suck in air, which mixes with the water flow in the mixing chamber and generates a water gas mixture flow in the horn shaped diffusion tube. The high-speed jet is sprayed out, and the water flow carrying many bubbles is vortex stirred in a large area and depth of water to complete aeration. Its shaft power does not change with the depth of submergence, and the air intake can be adjusted.