Sewage mixers, also known as submersible mixers or submersible thrusters, play an important role in sewage treatment processes. It is suitable for a variety of sewage treatment processes, mainly used to promote the mixing of sewage containing suspended solids, thin mud, industrial process liquids, etc., to create water flow, strengthen the mixing function, and prevent sludge precipitation. The following are some specific applicable sewage treatment processes:

First, the applicable process overview

Sewage mixers are used in many aspects of sewage treatment plants, including but not limited to pre-treatment, biochemical treatment, advanced treatment and other stages. It can effectively mix suspended matter and organic matter in sewage, improve treatment efficiency and ensure effluent water quality standards.

Second, the specific applicable process

1. Pretreatment stage

- Grid decontamination and regulating tank mixing: The grid decontamination machine is used to intercept and remove large debris in the fluid before the sewage enters the treatment system. Subsequently, the sewage enters the regulating tank for homogenization and equalization treatment. In this process, the sewage mixer can be used to regulate the mixing in the pool, make the water quality more uniform, and create good conditions for the subsequent treatment process.

2. Biochemical treatment stage

- Activated sludge process: In the activated sludge process, sewage mixers are often used in aeration tanks and sedimentation tanks. In the aeration tank, the mixer mixes sewage and activated sludge to provide sufficient oxygen and nutrients for microorganisms and promote the degradation of organic matter. In the sedimentation tank, the mixer helps to prevent the sludge from settling too quickly and ensure the quality of the effluent.

Anaerobic treatment process: for example, in UASB(upflow anaerobic sludge bed) reactors, although the UASB itself does not require additional mixing devices, in some cases, in order to improve the sludge distribution and mixing effect, sewage mixers may be used to assist mixing.

3. Advanced processing stage

- High efficiency sedimentation tank: In the high efficiency sedimentation tank, the sewage mixer can be used to stir in the flocculation tank to promote the combination of the flocculant and the suspended matter in the sewage to form a flocculant that is easy to settle. At the same time, in the sedimentation tank, the mixer also helps to keep the water flow uniform and prevent sludge deposition.

- Filtration and disinfection: In the filtration and disinfection stage, although the sewage mixer is not a direct treatment equipment, in some filtration systems, such as the backwash process of sand filters, mixers may be used to assist in mixing and flushing media.

Third, selection and configuration

The selection of sewage mixer should be comprehensively considered according to the specific process requirements, medium parameters (such as suspended matter content, viscosity, temperature, pH value), pool shape and water depth. In general, the optimal flow rate of the mixer should be maintained between 0.15 and 0.3m/s to ensure a good mixing effect and avoid waste of energy. At the same time, one or more mixers can be configured depending on the processing scale and needs.

Fourth, maintenance and maintenance

The sewage mixer needs regular inspection and maintenance during operation to ensure its normal operation and extend its service life. The inspection includes the operation of the mixer, leakage, and the status of cables and electrical components. In terms of maintenance, attention should be paid to replacing worn parts, cleaning the oil chamber and injecting the appropriate amount of lubricating oil.

In summary, the sewage mixer is suitable for a variety of sewage treatment processes, and is one of the indispensable important equipment in the sewage treatment system. In practical applications, selection and configuration should be carried out according to specific process requirements and conditions, and maintenance work should be strengthened to ensure its normal operation and best results.