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Homework Help: Water Treatment Pump Design

  1. Apr 19, 2010 #1
    Can someone please check this? Does this make sense?

    1. The problem statement, all variables and given/known data

    Determine the size (liters / hour) of a proportioning pump to feed ferric chloride for a .438 m^3/s water treatment plant. The optimum dose selected is 50mg/l. Ferric Chloride may be obtained in a liquid form that is 42% pure. The density of this solution is 1.797 kg/l.

    2. Relevant equations

    Not sure there are any, mostly unit conversion.

    3. The attempt at a solution

    1. Convert water treatment plant flow to l/hr.
    .438 m^3/s * (1000 Liter/1 m^3) * (3600 sec/ 1 hour)=1,738,800 L/hr

    2. Optimum dose to Kg/L
    50 mg FeCl3 /L H20 = .050 Kg FeCl3/L H20

    3. Find amount of ferric chloride in 1 liter solution using density and percentage given.
    1.797 Kg/l * 42% = .7547 kg FeCl3/L solution

    4. (This is where i am not sure) Find the amount of water one liter solution will treat.
    (.7547 Kg FeCl3 / L Solution) / (.050 Kg Fecl3/ L H20)= 15.0948 L H20 / Liter of Solution

    5. Divide to find total liters of solution needed per hour.

    1,738,800 L H20 /hr / 15.0948 LH20/L solution= 115,191.9866 L solution / Hr

    100,000 L/Hr with Significant Figures.
  2. jcsd
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