Application and selection of aeration Roots blower for sewage treatment in anaerobic and aerobic tanks
In the process of sewage treatment, anaerobic tanks and aerobic tanks respectively undertake different biological treatment tasks, and the aeration Roots blower is an important equipment that provides necessary oxygen for these treatment processes. The following is a detailed analysis of the application and selection of aeration Roots blowers in anaerobic and aerobic tank wastewater treatment:
1、 Treatment characteristics of anaerobic and aerobic tanks
1. Anaerobic tank:
Main function: Under anaerobic or low oxygen conditions, through the action of anaerobic microorganisms, substances are decomposed into gases such as carbon dioxide and methane, as well as some suspended solids and substances.
Required conditions: Anaerobic or low oxygen environment, usually not requiring aeration.
2. Aerobic tank:
Main function: Under aerobic conditions, through the action of aerobic microorganisms, further decompose substances and convert them into harmless substances such as carbon dioxide and water. Meanwhile, aerobic microorganisms can also promote the growth of nutrients such as nitrogen and phosphorus.
Requirement: Adequate oxygen supply, usually achieved through aeration equipment.
2、 Application of aeration Roots blower
1. Application in aerobic tanks:
The aeration Roots blower is one of the commonly used aeration devices in aerobic tanks. It injects air into the sewage to increase the dissolved oxygen content in the sewage, thereby providing sufficient oxygen supply for aerobic microorganisms.
The aeration Roots blower has the advantages of small size, low noise, and high efficiency, and is suitable for sewage treatment plants of various scales.
2. Potential applications in anaerobic tanks (although anaerobic tanks typically do not require aeration):
In certain special circumstances, such as when anaerobic tanks require agitation or mixing to improve treatment efficiency, aeration Roots blowers can also be used as agitation equipment. But this situation is relatively rare and usually requires the use of specially designed aerators to avoid interference with anaerobic microorganisms.
3、 Selection principles of aeration Roots blower
1. Oxygen demand:
Calculate the required amount of oxygen based on factors such as the size of the aerobic tank, sewage concentration, and aeration intensity.
Choose an aeration Roots blower that can meet the required amount of oxygen.
2. Flow rate and pressure rise:
The flow rate should meet the aeration requirements of the aerobic tank and consider a margin (usually 1.1-1.25 times the required flow rate of the system) to cope with fluctuations and air leakage losses during actual operation.
The pressure rise should be matched with the pressure drop of the aerobic tank system, and leave a margin (usually 1.05-1.15 times the system pressure drop) to ensure stable aeration effect.
3. Impeller material and sealing performance:
Due to the possible presence of corrosive substances and microorganisms in wastewater, corrosion-resistant materials should be selected for impeller materials.
The sealing performance should be good to prevent gas leakage and protect the internal components of the equipment.
4. Energy efficiency ratio and economy:
Choose an aeration Roots blower with high energy efficiency and low power consumption to reduce operating costs.
On the premise of meeting performance requirements, consider factors such as the price, maintenance cost, and service life of the fan to choose a higher product.
5. Customized requirements:
If the aeration requirements of the aerobic tank are special or complex, a customized aeration Roots blower solution can be considered. This usually requires detailed communication and design based on the actual situation.
In summary, anaerobic tanks and aerobic tanks play different roles in the sewage treatment process, and the aeration Roots blower is one of the commonly used aeration devices in aerobic tanks. When selecting, multiple factors need to be comprehensively considered based on the actual situation of the aerobic tank and the aeration requirements to choose the appropriate aeration Roots blower.
