In the Sewage Treatment Plant, wastewater and activated sludge are required to be treated. Aeration is a vital process that is necessary. The procedure of aerating wastewater is done in order to promote the bio-degradation of the polluting components. Bacteria used in wastewater treatment and stabilization are given oxygen through aeration. The bacteria require oxygen for biodegradation to take place.
The primary objective of an air blower in a wastewater treatment facility is to generate high pressure and create efficient airflow to provide air in the aeration process. Airflow is also known as flow rate. The naturally existing aerobic bacteria or microbes must have access to air in order to treat sewage and wastewater. The pressure generated by the air blower system ensures a steady flow of air. As a result, an air blower's air pressure and airflow rate are crucial components.
The air blower capacity is calculated using the below mentioned formula:
HP of the Blower / Fan = (CFM x PSI) / (229 x Blower Efficiency)
How to calculate blower efficiency in sewage treatment plant?
1. Calculating the air flow rate:
Understanding the air flow units is the first issue that many suppliers of blowers face. Designers typically describe the necessary mass flow rate of air since the process demand is based on the mass flow rate of oxygen required to treat the wastewater. The air flow rate required for aeration is dependent on the amount of organic matter in the wastewater.
The air flow rate is commonly calculated using the formula below:
Q = K x V x S.
Where:
Q = air flow rate (m3/min)
K = oxygen transfer rate (kgO2/kWh)
V = volume of wastewater (m3)
S = oxygen demand (kgO2/ m3)
2. Calculating the Discharge Pressure:
The second parameter required to calculate the efficiency of a blower can be defined once the system's air flow rates have been determined. Similar to air flow, most STPs have a range of discharge pressures rather than a single value.
It should be noted that blowers produce air flow rather than pressure. Pressure is produced throughout the process by air flow resistance. At a specific air flow, the blower must be able to overcome that pressure. Consider a blower functioning without discharge piping if this seems counterintuitive. There would be no pressure but a lot of flow as a result.
The submersion of the diffusers is responsible for the majority of the system's flow resistance. The resulting static pressure is essentially constant:
Pstatic =d/2.31
Where:
Pstatic= static pressure
D= depth of submergence
3. Choosing a blower:
Once you are aware of the required air flow rate and pressure, you can select the appropriate blower. Blowers are categorized based on their ability to produce pressure and flow. Select a blower that can deliver the required air flow rate and pressure and has an efficiency of at least 70%.
4. Examining the rating of motor:
The motor rating should be checked to ensure the blower can generate the required power. The required power can be calculated using the formula below:
P = (Q x P) / η
Where:
P = power required (kW)
Q = air flow rate (m3/min)
P = pressure required (Pa)
η = blower efficiency
5. Assessing the noise level:
Assessing the blower's noise level will ensure that it complies with local regulations. The noise level can be reduced by selecting a blower with a lower speed, installing a muffler or silencer, or moving the blower to a different location.
Do you need an advice or assistance on selecting the best water and waste water treatment unit? We have solutions for all your problems!
Let us now your problem, our experts will make sure that it goes away.
For an assistance or related query,
Call on +91-965-060-8473
Or write us at enquiry@netsolwater.com