Joshua Kogan
Member
Hey all, I just created another WRE PM problem. You have to know how to work with basic water treatment chemical reactions in order to ace the PM portion. I feel that many study programs cheat their students by offering tricks and tables; however, the PE problem developers are normally one step ahead of the study program providers -- learn to work with the equations!
A 40MGD water treatment plant employs ferric chloride as a coagulant at a dosage of 20ppm in which hydrated lime is used as the source of alkalinity. The ferric chloride stock solution is delivered at 60% strength and contains a specific gravity of 1.551. Calculate the discharge rate of the ferric chloride pump (gpm), and the lime feeder setting (lb/hour).
a) 0.20, 190.5
b) 0.50, 182.5
c) 0.60, 182.5
d) 0.80, 190.5
Check out the solution here: http://wrecrossfit.com/post/137896529681/example-problem-6-a-40mgd-water-treatment-plant
Please let me know what you think about the question!
A 40MGD water treatment plant employs ferric chloride as a coagulant at a dosage of 20ppm in which hydrated lime is used as the source of alkalinity. The ferric chloride stock solution is delivered at 60% strength and contains a specific gravity of 1.551. Calculate the discharge rate of the ferric chloride pump (gpm), and the lime feeder setting (lb/hour).
a) 0.20, 190.5
b) 0.50, 182.5
c) 0.60, 182.5
d) 0.80, 190.5
Check out the solution here: http://wrecrossfit.com/post/137896529681/example-problem-6-a-40mgd-water-treatment-plant
Please let me know what you think about the question!
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