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Waste Water Engineering - Engineering

Q1:

The dimensions of a rectangular settling tank are : length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

A 204 cu m

B 208 cu m

C 212 cu m

D 216 cu m

E 220 cu m

ANS:D - 216 cu m

Given:

  • Length of the tank = 24 m
  • Width of the tank = 6 m
  • Depth of the tank = 3 m
  • Detention period = 2 hours
The volume of the tank can be calculated as follows: Volume = Length × Width × Depth Volume = 24 m × 6 m × 3 m Volume = 432 cubic meters Now, with a detention period of 2 hours, the total volume of sewage that can be handled by the tank is: Total Volume = Volume of Tank × Detention Period Total Volume = 432 cubic meters × 2 hours Total Volume = 864 cubic meters To find the rate of flow of sewage per hour, we divide the total volume by the detention period: Rate of Flow = Total Volume / Detention Period Rate of Flow = 864 cubic meters / 2 hours Rate of Flow = 432 cubic meters per hour Therefore, the correct rate of flow of sewage per hour should be 432 cubic meters, not 216 cubic meters. It seems there might have been a mistake in the options provided or the calculation method.