How to calculate Filter Feed Pump capacity in MBBR based Sewage Treatment Plant?
Sewage treatment plants (STP) are essential for maintaining a healthy environment by treating sewage and releasing clean water back into the ecosystem. One critical component of a sewage treatment plant is the filter feed pump, which is responsible for providing the necessary amount of water to the filters.
Now let us, discuss how to calculate the filter feed pump capacity in MBBR sewage treatment plants.
What is MBBR?
MBBR, or Moving Bed Biofilm Reactor, is a widely used technology in sewage treatment plants. It is an advanced form of the activated sludge process and is particularly useful in treating high-strength sewage.
In MBBR, bacteria grow on plastic biofilm carriers that move in the reactor, creating a biofilm layer that breaks down organic matter. The biofilm carriers are kept in suspension by the aeration system, which provides oxygen for the bacteria.
How to find capacity of filter feed pump?
To calculate the filter feed pump capacity in an MBBR based sewage treatment plant, we need to consider several factors. These factors include:
· Flow rate
· Retention time
· Specific gravity of (sewage).
Steps in calculation of the filter feed pump Capacity
Step 1- Finding Flow rate: The flow rate is the amount of water that enters the treatment plant in a given period. It is measured in cubic meters per day (m3/day) or cubic meters per hour (m3/hr). To calculate the flow rate, we need to know the average daily flow rate of sewage into the plant.
Step 2- Finding Retention time: The retention time is the amount of time that sewage stays in the treatment plant before being discharged. It is measured in days or hours.
The retention time depends on the plant's design and the amount of sewage that needs to be treated. For MBBR based sewage treatment plants, the retention time is usually between 6 and 10 hours.
Step 3- Finding Specific gravity: The specific gravity of sewage is the ratio of its density to the density of water. It is a measure of how dense the sewage is compared to pure water. The specific gravity of sewage depends on its composition and can vary widely. However, for most sewage, the specific gravity is around 1.0.
Step 4- Using formula to get the result:
Once we have determined the flow rate, retention time, and specific gravity of the sewage, we can use the following formula to calculate the filter feed pump capacity:
Filter Feed Pump Capacity (m3/hr) = Flow rate (m3/day) / Retention time (hr) x Specific gravity
Let’s understand using an example for Filter Feed pump size calculations:
Let's say we have an MBBR sewage treatment plant that treats 500 cubic meters of sewage per day. The retention time in the plant is 8 hours, and the specific gravity of the sewage is 1.2. Using the formula above, we can calculate the filter feed pump capacity as follows:
Filter Feed Pump Capacity (m3/hr) = 500 (m3/day) / 8 (hr) x 1.2
Filter Feed Pump Capacity = 75 m3/hr
Therefore, the filter feed pump capacity required for this plant is 75 cubic meters per hour.
In conclusion, calculating the filter feed pump capacity in an MBBR sewage treatment plant is a crucial step in designing and operating an efficient treatment process. By considering the flow rate, retention time, and specific gravity of the sewage, we can determine the required pump capacity to ensure the filters receive the necessary amount of water to operate effectively. The formula used to calculate the filter feed pump capacity is simple and can be easily applied to any MBBR based sewage treatment plant.
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