How to Calculate Size of ACF (Activated carbon filter) and DMF (Dual media filter) in MBBR based Sewage Treatment Plant?
Sewage treatment plants (STPs) are vital for ensuring proper sewage management in residential and commercial areas. These plants rely on a variety of filtration methods, including activated carbon filters (ACFs) and dual media filters (DMFs), to remove contaminants and impurities from sewage.
Let us discuss how to calculate the ACF and DMF sizing for MBBR-based STP's?
What is ACF and how do you calculate its capacity?
Activated Carbon Filter (ACF):
Activated carbon filters (ACFs) are used to remove organic contaminants from sewage. The carbon in the filter acts as a medium to absorb these contaminants, and the filter can be regenerated periodically.
Some Parameters:
To calculate the sizing of the ACF for Moving bed biofilm reactor (MBBR)-based STP, the following parameters must be considered:
1. Flow rate of the sewage: This refers to the amount of water that passes through the filter per unit time. It is typically measured in liters per hour (L/hr) or cubic meters per hour (m3/hr).
2. Concentration of the organic contaminants: This refers to the amount of organic contaminants in the sewage. It is typically measured in milligrams per liter (mg/L) or parts per million (ppm).
3. Bed depth of the filter: This refers to the height of the filter bed, which is typically between 0.9 and 1.2 meters.
Calculating sizing of ACF
To calculate the Activated Carbon Filter sizing, the following formula can be used:
ACF Sizing = (Flow rate x Concentration x Contact time) / (Bed depth x Carbon capacity)
Here, the contact time refers to the amount of time the sewage is in contact with the filter, which is typically between 5 and 15 minutes. The carbon capacity refers to the amount of organic contaminants that can be absorbed by the activated carbon per unit weight, which is typically between 20 and 30 mg/g.
What is DMF and how do you calculate its capacity?
Dual Media Filter (DMF):
Dual media filters (DMFs) are used to remove suspended solids from sewage. They consist of two layers of different filter media, such as sand and anthracite, which act as a medium to trap the suspended solids.
Some Parameters:
To calculate the sizing of the DMF for an MBBR-based STP, the following parameters must be considered:
1. Flow rate of the sewage: This refers to the amount of water that passes through the filter per unit time. It is typically measured in liters per hour (L/hr) or cubic meters per hour (m3/hr).
2. Suspended solids concentration: This refers to the amount of suspended solids in the sewage. It is typically measured in milligrams per liter (mg/L) or parts per million (ppm).
3. Bed depth of the filter: This refers to the height of the filter bed, which is typically between 0.9 and 1.2 meters.
4. Particle size of the filter media: This refers to the size of the filter media, which is typically between 0.8 and 1.2 millimeters for sand and 0.3 and 0.6 millimeters for anthracite.
Calculating sizing of Dual Media Filter:
To calculate the DMF sizing, the following formula can be used:
DMF Sizing = (Flow rate x Suspended solids concentration) / (Bed depth x Surface loading rate)
Here, the surface loading rate refers to the amount of suspended solids that can be removed per unit area of the filter bed per unit time, which is typically between 20 and 30 cubic meters per day per square meter (m3/day/m2).
Conclusion:
ACFs and DMFs are critical components of MBBR-based sewage treatment plants. Proper sizing of these filters is essential to ensure effective removal of contaminants and impurities from sewage. By considering the parameters mentioned above and using the formulas provided, the ACF and DMF sizing can be found.
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