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Posted by on Thursday, July 10, 2014 at 7:15am.

A water treatment plant has 6 settling tanks
that operate in parallel (the flow gets split into
six equal flow streams), and each tank has a
volume of 600m3. If the flow to the plant is
10 mgd, what is the retention time in each
of the settling tanks? If, instead, the tanks
operated in series (the entire flow goes first
through one tank, then the second, and so
on), what would be the retention time in each

  • environmental engineering - , Thursday, March 3, 2016 at 4:05am


  • environmental engineering - , Sunday, June 26, 2016 at 12:01am

    1.) parallel
    Q1=Q2=Q3=Q4=Q5=Q6= (440L/s)/(6)
    t=V/Q=((600m^3)/(440/g L/s))x (1000 L)/ (1m^3L = 8181.82 s

    2.) series
    Q1=Q2=Q3=Q4=Q5=Q6= 440L/s
    t= (600 m^3)/(440 L/s) x (1000L/m^3) = 1363.64 s

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