Question: A rectangular settling tank (Type I Settling only) with a length: width of 2:1 treats water at 4000 m 3 /d. The retention time is

  • A rectangular settling tank (Type I Settling only) with a length: width of 2:1 treats water at 4000 m3 /d. The retention time is 25 min and depth is 4 m.
  • a. Calculate the overflow rate and the horizontal velocity assuming an even velocity distribution throughout the settling tank.
  • b. Given the settling velocity curve below, what is the expected removal?
  • c. If you were asked by your client to improve the efficiency of this settling tank by 10% how much longer (added length) would you need to build your tank?

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