The following wastewater treatment processes usually require the use of Roots fans:

1. Activated sludge method

1. Traditional activated sludge method

- In the traditional activated sludge treatment process, the Roots fan provides air for the aeration tank, so that the microorganisms in the activated sludge are fully in contact with the organic matter in the sewage for aerobic biochemical reaction. Through the stable gas supply of Roots fan, it ensures that microorganisms have enough oxygen for metabolic activities, so as to effectively remove organic pollutants in sewage.

- For example, in municipal sewage treatment plants, where the traditional activated sludge process is widely used, Roots fans provide a reliable air source for the aeration process, ensuring a stable sewage treatment effect.

2. Stage aerated activated sludge method

- The activated sludge method of stage aeration enters the sewage at multiple points along the aeration tank, so that the organic load distribution is more uniform. The Roots fan also plays a key role in providing oxygen in this process to meet the needs of microorganisms for oxygen at different stages.

- This process can improve the efficiency of the treatment and reduce the possibility of sludge swelling, and the stability of Roots fans can provide the necessary support.

Second, biofilm method

1. Biological filter

- In the biofilter, the Roots fan delivers air through the ventilation system to the filter material layer to provide oxygen for microorganisms attached to the filter material. Microorganisms degrade organic matter in sewage under aerobic conditions, so as to achieve the purpose of sewage treatment.

- The air volume and pressure of Roots fan need to be reasonably adjusted according to the size of the filter, the type of filter material and the load of sewage to ensure the normal operation of the biological filter.

2. Biological Turntable

- The biofilm on the biological turntable is in contact with sewage and air during the rotation process, and the Roots fan provides sufficient oxygen to promote the growth and metabolism of the biofilm. The stable gas supply of Roots fan can ensure that the microorganisms in each part of the biological turntable can get enough oxygen and improve the efficiency of sewage treatment.

- The biological turntable process is suitable for small and medium-sized sewage treatment, and the flexible performance of Roots fans enables it to meet the needs of different scale treatment.

Third, oxidation ditch method

1. Carrousel oxygenation ditch

- Carrousel oxidation communicates water flow through equipment such as rotary brushes or turntables, while Roots fans provide oxygen in the ditch. The gas supply of Roots fan can be automatically adjusted according to the concentration of dissolved oxygen in the oxidation ditch to ensure the oxygen demand of microorganisms at different stages.

- This process has the advantages of good treatment effect and strong impact load resistance, and the stable operation of Roots fans is essential to achieve these advantages.

2. Aubel oxidation ditch

- The Aubel oxidation ditch consists of a number of concentric circular ditches in which the sewage flows in turn through different treatment areas. The Roots fan provides oxygen to each ditch to meet the aerobic requirements of microorganisms in different areas.

- The air volume distribution of Roots fan needs to be reasonably designed according to the structure and treatment process of the oxidation ditch to ensure the uniformity and stability of the sewage treatment effect.

4. SBR Method (Sequencing batch Activated sludge Method)

1. Traditional SBR method

- In the traditional SBR process, the Roots fan provides air to the reaction tank during the aeration stage to enable the microorganisms in the activated sludge to perform aerobic biochemical reactions. The start and stop of Roots fan can be automatically controlled according to the process requirements to realize the switch of different stages.

-SBR method has the advantages of simple process flow and small footprint, and the flexible control of Roots fan can provide convenience.

2. Improved SBR method

- Improved SBR processes such as ICEAS and CASS also require Roots fans to provide oxygen during the aeration stage. The performance and control mode of Roots fan need to be adjusted according to the specific improvement process to meet different processing requirements.

- These improved processes have certain advantages in improving treatment efficiency and reducing operating costs, and the rational application of Roots fans helps to bring these advantages into play.