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A household septic tank, constructed under Indian conditions, has a detention time of-
  • a)
    5 to 6 hours
  • b)
    24 to 48 hours
  • c)
    12 to 36 hours
  • d)
    30 to 60 hours
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A household septic tank, constructed under Indian conditions, has a d...
A septic tank can be defined as a primary sedimentation tank with a large detention time (12 to 36hrs against a period of 2hrs in an ordinary sedimentation tank).
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A household septic tank, constructed under Indian conditions, has a d...
Detention Time of a Household Septic Tank

Detention time refers to the amount of time that wastewater remains in a septic tank before it is discharged into the drain field. It is an important parameter to consider when designing and constructing septic tanks, as it determines the level of treatment that can be achieved and the overall efficiency of the system.

The correct answer to the given question is option 'C' - 12 to 36 hours. Let's understand why this is the correct answer in more detail:

Importance of Detention Time
The detention time of a septic tank is crucial for the proper functioning of the system. It allows for the separation of solid waste from the liquid effluent and provides an opportunity for anaerobic bacteria to break down the organic matter present in the wastewater.

Factors Affecting Detention Time
Several factors influence the detention time of a septic tank, including:

1. Tank Size: The size of the septic tank affects the volume of wastewater it can hold and ultimately determines the detention time. Larger tanks have longer detention times, allowing for more effective treatment.

2. Inflow Rate: The rate at which wastewater enters the septic tank also affects the detention time. Higher inflow rates can reduce the detention time and may lead to inadequate treatment.

3. Baffle Design: The presence of baffles within the septic tank helps to retain solids and prevent them from flowing into the drain field prematurely. Proper baffle design ensures an adequate detention time.

4. Organic Loading: The amount of organic matter present in the wastewater influences the detention time. Higher organic loading requires a longer detention time for proper treatment.

Indian Conditions
The specific conditions in India, including the population density, water usage patterns, and climate, have led to the recommendation of a detention time range of 12 to 36 hours for household septic tanks.

This range provides sufficient time for the separation of solids and the decomposition of organic matter. It also takes into account the typical water usage patterns in Indian households and allows for the effective treatment of wastewater.

It is important to note that the detention time may vary for different types of septic tanks and specific site conditions. Therefore, it is recommended to consult local regulations and guidelines to determine the appropriate detention time for a particular location.

In conclusion, the correct detention time for a household septic tank constructed under Indian conditions is 12 to 36 hours. This range ensures proper treatment of wastewater and is suitable for the prevailing conditions in the country.
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A household septic tank, constructed under Indian conditions, has a detention time of-a)5 to 6 hoursb)24 to 48 hoursc)12 to 36 hoursd)30 to 60 hoursCorrect answer is option 'C'. Can you explain this answer?
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