The mixing equipment of the sewage treatment plant generally selects different types of agitators according to the specific treatment needs, the nature of the sewage and the scale of the treatment. Here are some common types of mixing equipment found in wastewater treatment plants:

1. Propulsion agitator: This type of agitator is usually suitable for large-scale sewage treatment plants. They have a strong mixing effect and help to achieve a uniform distribution of substances in the wastewater treatment process.

2. Paddle agitator: suitable for smaller sewage treatment facilities, its structure is simple, easy to maintain, is the ideal choice for small sewage treatment plants.

3. Turbine agitator: Excellent performance in the treatment of high concentration of sewage, because they have a strong shear force, can effectively break up the substances in the sewage and mix.

4. Screw stirrer: especially suitable for the treatment of organic wastewater. This type of mixer mixes evenly and has low energy consumption, which contributes to energy saving and environmental protection.

5. Low speed flow booster: commonly used in oxidation ditch and hypoxia pool, characterized by large blade and slow speed, it can produce a large range of flow pushing effect, and is also suitable for the maintenance of landscape water environment.

6. High-speed submersible mixer: In order to prevent sludge sedimentation, this type of mixer will be configured in the oxidation ditch, anaerobic tank, anoxic tank, regulating tank and other areas. Their speed is fast, and the anti-precipitation effect is better in a small range.

7. Vertical mixer: mainly used in the stage of coagulation and flocculation, the motor is located on the water surface, and the mixing is completed by independent blades to promote the effective precipitation of sludge.

In addition, there are several other types of mixing equipment, such as horizontal mixers, vertical mixers, bridge mixers and hybrid mixers, which are suitable for different types and sizes of sewage treatment plants to meet specific mixing and treatment needs.

In general, the selection of mixing equipment for sewage treatment plants is a comprehensive process, which needs to be determined according to many factors such as treatment technology, cost budget, and maintenance convenience.