MBBR (Moving Bed Biofilm Reactor) technology has been gaining popularity in the field of sewage treatment due to its high efficiency and low operational and maintenance costs. One of the crucial aspects of MBBR technology is selecting the right amount of MBBR media for the treatment process.
Let’s move forward into learning how to calculate MBBR media requirements in STP (Sewage Treatment Plant) and the formula to do so.
What is MBBR Media?
Moving Bed Biofilm Reactor media is a polyethylene biofilm carrier that is used in MBBR systems. It provides a large surface area for the growth of microorganisms that break down organic matter in sewage.
Factors affecting MBBR Media Requirement:
The MBBR media requirement depends on various factors such as:
· Sewage flow rate
· Organic load
· HRT (Hydraulic Retention Time)
· MLSS (Mixed Liquor Suspended Solids)
· Required effluent quality
How to calculate MBBR media requirement in STP?
The MBBR media requirement can be calculated using the following formula:
MBBR Media Volume (m3) = (F × V) / (P × S × H)
Where,
F = Organic Load (kg BOD5/day)
V = Sewage Flow Rate (m3/day)
P = Media Filling Percentage (Typically 40-60%)
S = Specific Surface Area of MBBR Media (m2/m3)
H = Height of MBBR Tank (m)
Step-by-Step Calculation Process:
Let's consider an example to calculate the Moving Bed Biofilm Reactor media requirement for a STP with the following parameters:
Sewage flow rate = 100 m3/day
Organic Load = 1000 kg BOD5/day
Media filling percentage = 50%
Specific Surface Area of MBBR Media = 800 m2/m3
Height of MBBR Tank = 3 m
Step 1:
Calculate the Required MBBR Media Volume.
MBBR Media Volume = (F × V) / (P × S × H)
MBBR Media Volume = (1000 × 100) / (0.5 × 800 × 3) = 83.33 m3
Step 2:
Determine the Number of MBBR Media Carriers Required.
The number of MBBR media carriers required can be calculated by dividing the MBBR media volume by the volume of each media carrier.
Assuming the volume of each media carrier is 0.2 m3, the number of media carriers required would be:
Number of Media Carriers = MBBR Media Volume / Volume of Each Carrier
Number of Media Carriers = 83.33 / 0.2 = 416.65
Rounding it off, the total number of media carriers required would be 417.
Step 3:
Determine the Total Weight of MBBR Media Required.
The weight of MBBR media required can be calculated by multiplying the number of media carriers by the weight of each carrier.
Assuming the weight of each media carrier is 30 kg, the total weight of MBBR media required would be:
Total Weight of MBBR Media = Number of Media Carriers × Weight of Each Carrier
Total Weight of MBBR Media = 417 × 30 = 12510 kg.
Conclusion:
The calculation of MBBR media requirement is an important aspect of designing a Sewage Treatment Plant. The MBBR media requirement depends on various factors such as sewage flow rate, organic load, design parameters, and required effluent quality. The formula to calculate MBBR media requirement involves the organic load, sewage flow rate, media filling percentage.
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