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In continuous flow sedimentation tanks the actual detention period used in practice should be
- a)Equal to 3/4th the theoretical detention period.
- b)Less than Half the theoretical detention period.
- c)More than twice the theoretical detention period.
- d)Equal to 1/4th the theoretical detention period.
Correct answer is option 'C'. Can you explain this answer?
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In continuous flow sedimentation tanks the actual detention period use...
Detention Period in Continuous Flow Sedimentation Tanks
Detention period in continuous flow sedimentation tanks refers to the time taken for water to flow through the tank from the inlet to the outlet. The theoretical detention period is calculated based on the tank's design parameters and flow rate.
Actual Detention Period
In practice, the actual detention period used in continuous flow sedimentation tanks should be more than twice the theoretical detention period. This is because:
- Settling Efficiency: All particles in the influent water may not settle within the theoretical detention period. Therefore, a longer detention period allows for better settling efficiency and improved removal of suspended solids.
- Flow Variability: In real-world scenarios, flow rates can vary due to fluctuations in influent water quality or quantity. A longer detention period provides a buffer against these fluctuations, ensuring consistent treatment performance.
- Residence Time: A longer detention period allows for a longer residence time in the tank, which is crucial for the settling of fine particles and the separation of solids from water.
- Overload Conditions: During peak flow conditions, the tank may experience overload. A longer detention period helps in handling these peak loads without compromising treatment efficiency.
Conclusion
In conclusion, the actual detention period used in practice in continuous flow sedimentation tanks should be more than twice the theoretical detention period to ensure optimal treatment efficiency, settling performance, and resilience against flow variability and overload conditions.
Detention period in continuous flow sedimentation tanks refers to the time taken for water to flow through the tank from the inlet to the outlet. The theoretical detention period is calculated based on the tank's design parameters and flow rate.
Actual Detention Period
In practice, the actual detention period used in continuous flow sedimentation tanks should be more than twice the theoretical detention period. This is because:
- Settling Efficiency: All particles in the influent water may not settle within the theoretical detention period. Therefore, a longer detention period allows for better settling efficiency and improved removal of suspended solids.
- Flow Variability: In real-world scenarios, flow rates can vary due to fluctuations in influent water quality or quantity. A longer detention period provides a buffer against these fluctuations, ensuring consistent treatment performance.
- Residence Time: A longer detention period allows for a longer residence time in the tank, which is crucial for the settling of fine particles and the separation of solids from water.
- Overload Conditions: During peak flow conditions, the tank may experience overload. A longer detention period helps in handling these peak loads without compromising treatment efficiency.
Conclusion
In conclusion, the actual detention period used in practice in continuous flow sedimentation tanks should be more than twice the theoretical detention period to ensure optimal treatment efficiency, settling performance, and resilience against flow variability and overload conditions.
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In continuous flow sedimentation tanks the actual detention period use...
Continuous Flow Type Sedimentation Tank
- In this water is not allowed to rest.
- Flow always takes place but with a very small velocity. During this flow, suspended particles settle at the bottom of the tank.
- The flow may be either in the horizontal direction or vertical direction.
Detention time:
It is defined as the average theoretical time required for water to flow along the length of the sedimentation tank.
In continuous-flow sedimentation tanks, the actual detention period used in practice should be more than twice the theoretical detention period.
It is given by the ratio of the volume of the tan to the rate of flow:
[Valid for both rectangular and circular tanks]
It can also be calculated as:
[Valid for rectangular tank only]
Here,
V - Volume of the tank (m3)
For a rectangular tank,
V = L × B × H
For a circular tank,
Where
L - Length of the tank (m), B - Width of the tank (m), H - Height of the tank (m)
d - Diameter of the circular tank (m), Q - Rate of flow (m3/sec) = A × v
A - Area of c\s (m2) = B × H, td - Detention time (sec)
v - Average velocity of the flow (m/sec)
It is defined as the average theoretical time required for water to flow along the length of the sedimentation tank.
In continuous-flow sedimentation tanks, the actual detention period used in practice should be more than twice the theoretical detention period.
It is given by the ratio of the volume of the tan to the rate of flow:
[Valid for both rectangular and circular tanks]It can also be calculated as:
[Valid for rectangular tank only]Here,
V - Volume of the tank (m3)
For a rectangular tank,
V = L × B × H
For a circular tank,
Where
L - Length of the tank (m), B - Width of the tank (m), H - Height of the tank (m)
d - Diameter of the circular tank (m), Q - Rate of flow (m3/sec) = A × v
A - Area of c\s (m2) = B × H, td - Detention time (sec)
v - Average velocity of the flow (m/sec)
Important Points
The following table shows the detention period for different types of sedimentation:
The following table shows the detention period for different types of sedimentation:
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In continuous flow sedimentation tanks the actual detention period used in practice should bea)Equal to 3/4th the theoretical detention period.b)Less than Half the theoretical detention period.c)More than twice the theoretical detention period.d)Equal to 1/4th the theoretical detention period.Correct answer is option 'C'. Can you explain this answer?
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