Vacuum Pump in Sewage Treatment Plant

The existing sewage treatment devices in sewage treatment plants usually discharge after simple treatment such as medication, precipitation and purification, rather than recycling, resulting in waste of water resources. The process of sewage treatment involves many theories, technologies and methods. There are many applications of vacuum technology. The application of vacuum pump in sewage treatment plant hopes to alleviate environmental pollution and make sewage treatment an important aspect of environmental protection.

In essence, sewage treatment is to use various means and technologies to separate pollutants from sewage, or convert them into harmless substances, so that sewage can be purified and meet discharge standards.

According to the degree of treatment, sewage treatment (mainly municipal domestic sewage and some industrial sewage) can generally be divided into first, second and third levels. The primary treatment is the removal of suspended solid pollutants. Secondary treatment is the removal of colloidal and dissolved organic pollutants from sewage by a large margin. The third-stage treatment is to further remove the pollutants that can not be removed by the second-stage treatment.

Vacuum technology refers to scientific testing, physical measurement and process making under the condition of lower atmospheric pressure. With the widespread use of vacuum technology, vacuum technology is more and more inseparable from the lives of the people of Li, in which vacuum pumps play an increasingly important role in sewage treatment.


There are many kinds of vacuum pumps, such as dry screw vacuum pump, water ring pump, Roots pump and so on. Rotary vane vacuum pump is widely used in sewage treatment projects. Rotary vane vacuum pump is used to transport water, wet sludge and flocculant liquid in sewage treatment because of its variable transport, strong self-priming ability, reversible, and ability to transport liquid containing solid particles. According to the needs of sewage treatment projects, the selection of vacuum pumps should follow the principles of economy, rationality and reliability.

Vacuum Pump in Sewage Treatment Plant Typical Application:

1. Vacuum filtration dehydration

Its characteristics are continuous operation, stable operation, large processing capacity, automatic operation, solid content of treated mud cake can meet the dehydration requirements. Vacuum degree is the driving force of vacuum filtration, which is directly related to filtration productivity and operation cost.

2. Vacuum crystallizer

It has the characteristics of simple structure, light weight, corrosion resistance and easy control. Keeping different vacuum and temperature can improve the quality and speed of crystallization.

3. Vacuum aeration, flotation, agitation and others

It can remove bubbles from sludge flocs discharged from digestion tanks and greatly improve sludge sedimentation performance.

The application of vacuum pump in sewage treatment plant has obviously improved the degree of sewage purification, and is conducive to the recovery and reuse of water resources. Now we will introduce some matters needing attention in the use of vacuum pumps as follows:

1. Selection of Speed of Vacuum Pump

The flow rate of vacuum pump has a linear relationship with the rotational speed. Compared with the low-speed vacuum pump, the high-speed vacuum pump can increase the flow rate and head, but the power increases obviously. The high-speed accelerates the wear between the rotor and the stator, which will inevitably lead to premature failure of the vacuum pump. Moreover, the length of the stator and rotor of the high-speed vacuum pump is very short and easy to wear. The service life of the vacuum pump is shortened because of the loss.

2. Ensure that impurities do not enter the pump body

Solid debris mixed in wet sludge will damage the rubber stator of vacuum pump, so it is very important to ensure that debris does not enter the pump chamber. Many sewage plants install crushers before the pump, and some install grille devices or filters to prevent debris from entering the vacuum pump. The grille should be removed in time to avoid blockage. Plug.

3. Quality of Vacuum Pump

Vacuum pump is a good choice with reasonable design, excellent material, long rated life and in place service.

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