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Introduction to pressure, air volume and type selection of Roots blower for sewage treatment:

Source: Roots blower manufacturer Published on: June 29, 2022 Hits:

Roots blower for sewage treatment aeration Selection of

Roots blower for sewage treatment

1. Model selection

When selecting the blower for the sewage treatment plant, the performance parameters given on the fan manufacturer's product samples are all under the standard air intake state. However, the fan is not in the standard state in actual use. When the environmental conditions of the blower, such as temperature, atmospheric pressure and altitude, are different, the performance of the fan will also change, The performance parameters on the product sample cannot be directly used in the design of model selection, but the performance requirements of the fan need to be converted into the fan parameters under the standard air inlet state according to the actual use state.

2. Pressure

The exhaust pressure of the positive displacement blower does not depend on the blower itself, but on the device after the gas is discharged from the blower, which is determined by the so-called back pressure. The aeration blower has the characteristics of forced gas transmission. The exhaust pressure marked on the blower nameplate is the rated exhaust pressure of the blower. In fact, the blower can work at any pressure lower than the rated exhaust pressure, and can also work above the rated exhaust pressure as long as the strength and exhaust temperature allow. For the sewage treatment plant, the absolute pressure (back pressure) generated by the exhaust system is the sum of the pressure loss value of the pipeline system, the depth of the aeration tank and the ambient atmospheric pressure. (roughly the water depth plus one meter)

Roots blower for sewage treatment

3. Air volume (oxygen demand)

When calculating the oxygen demand for sewage treatment, the result is the mass flow qm (kg/min) of oxygen required under the standard state, and then convert it into the volume flow qv1 (m3/min) of air required under the standard state. If the use state of the blower is not the standard state, such as in the plateau area, the air density and moisture content will change, The volume flow of air supplied by the blower is the same as the standard state, but the mass flow of air supplied will be reduced, which may lead to insufficient oxygen supply. The simplest calculation method is to calculate one square four aeration heads according to the area of sewage pool, and the air supply capacity of each aeration head is 0.03m3/min (0.03 here is the middle value of the aeration head)

The above is the pressure, air volume and model selection of Roots blower for sewage treatment. I hope it can help you!

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