Moving Bed Biofilm Reactors (MBBRs) are a popular sewage treatment technology that utilizes microorganisms to remove organic and inorganic pollutants. The capacity of an MBBR tank plays a crucial role in the efficiency of the treatment process.
Let us discuss how to calculate the MBBR tank capacity in Sewage Treatment Plant (STP).
Importance of MBBR Tank
There are several reasons why MBBR tanks are essential in wastewater treatment:
High Treatment Efficiency: MBBR tanks are highly efficient in treating wastewater due to their unique design. The tanks contain a large number of plastic media carriers that provide a large surface area for bacteria to grow and form biofilm. This increases the rate of biological reactions, leading to faster and more efficient wastewater treatment.
Low Space Requirement: MBBR tanks require less space compared to other conventional wastewater treatment technologies, making them ideal for areas with limited space.
Easy to operate: MBBR tanks are relatively easy to operate and maintain. They require minimal operator attention and have low energy and chemical requirements, making them a cost-effective option.
Robust Design: MBBR tanks are designed to be durable and withstand harsh conditions. They are made from high-quality materials that can resist corrosion and are not affected by fluctuations in temperature.
Versatility: MBBR tanks can be used for a variety of applications, including municipal wastewater treatment, industrial wastewater treatment, and the treatment of contaminated groundwater.
Retention Time in STP
Retention time is the amount of time sewage remains in the treatment system. It is an important parameter that determines the efficiency of the treatment process.
In an MBBR system, the retention time is the time taken for sewage to flow through the tank, allowing the microorganisms to remove the pollutants. Formula for retention time in STP is as follows:
Retention Time = Volume of MBBR tank / Flow rate of sewage
How to calculate MBBR tank capacity for MBBR based STP?
The capacity of a Moving Bed Biofilm Reactor tank is determined by the retention time, the flow rate of sewage, and the volume of the tank.
The following formula is used to calculate the MBBR tank capacity:
MBBR Tank Capacity = Flow rate of sewage x Retention Time
Where,
Flow rate of sewage = Volume of sewage generated per day / 24 hours
Retention Time = Volume of MBBR tank / Flow rate of sewage
An Example:
Let's assume that the volume of sewage generated per day is 50,000 liters and the retention time required is 6 hours. The flow rate of sewage would be:
Flow rate of sewage = 50,000 / 24 = 2,083.33 liters/hour
Now, using the retention time formula, we can calculate the required MBBR tank capacity:
Retention Time = Volume of MBBR tank / Flow rate of sewage
6 hours = Volume of MBBR tank / 2,083.33 liters/hour
Volume of MBBR tank = 6 x 2,083.33 = 12,500 liters
Therefore, the required MBBR tank capacity for a retention time of 6 hours and a flow rate of 2,083.33 liters/hour is 12,500 liters.
Conclusion
In conclusion, the MBBR tank capacity is a critical parameter in the design and operation of an MBBR system. The retention time in the STP is a key factor in determining the tank capacity. Using theformula and calculation method described above, we can accurately determine the required MBBR tank capacity for a given retention time and flow rate of sewage. This information is essential foreffective MBBR system design and operation, ensuring optimal treatment efficiency and sewage quality.
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