Guide for Model Selection of Aeration Roots Fan**
**Keywords * *: aeration Roots blower model
**1、 The role of Roots blower in aeration system**
Roots blower is the core equipment of sewage treatment aeration system, which promotes microbial degradation of pollutants by injecting oxygen into the water body. Its characteristics are stable air volume, strong pressure adaptability, and suitable for continuous operation conditions.
**2、 Analysis of mainstream aeration Roots blower models**
1. * * Three leaf Roots blower * * (such as CSR series)
-Advantages: Low noise (<75dB), high efficiency (energy saving of over 15%), suitable for urban sewage treatment plants.
-Parameter example: Air volume 5-100m3/min, pressure range 9.8-58.8kPa.
2. * * Two blade Roots blower * * (such as L series)
-Advantages: Simple structure, low maintenance cost, suitable for small-scale industrial wastewater treatment.
-Attention: The noise is high and a muffler needs to be installed.
3. High pressure Roots blower (such as R series)
-Application scenario: Deep water aeration (such as water depth above 5 meters), with a pressure of up to 98kPa or more.
**3、 Key parameters for selection**
-Airflow calculation: Determine the oxygen demand based on the COD load of the water body (formula: Q=K × COD × V, K is a coefficient of 0.8-1.2).
-Pressure demand: pipeline loss+water depth pressure (increasing by 9.8kPa per meter of water depth) needs to be considered.
-* * Case * *: A food factory wastewater treatment project selected the -150 model (air volume of 30m3/min, pressure of 49kPa), resulting in a 12% reduction in annual electricity consumption.
**4、 Special models and customized solutions**
-Explosion proof models (such as Ex-IIBT4) are suitable for the petrochemical industry;
-The variable frequency model can match the air volume demand by adjusting the speed, saving energy by more than 30.
