PE Exam Practice Problem #84: Water Resources/Environmental | Chlorine Concentration vs Weight

"Welcome to SolvedIn6: Free practice problems for the Professional Engineering Exam! Each question is styled after those created by the NCEES, and is usually solved in under 6 minutes, which is the average time you will have to solve each question on the Professional Engineering Exam.

Today's problem comes with a very long problem statement, but is actually extremely simple to solve. A lot of the information provided about the wastewater treatment plant is extraneous and just meant to confuse you. Things you can ignore include the screw pump and wet well information, as well as the max dosing rates of the two chlorinator units. The problem is simply asking you to find the flow rate (really the peaking factor of the flow rate) associated with a given concentration of chlorine, after knowing the total weight of chlorine within that flow rate.

Section 6.7.1 of the civil reference manual provides the exact equation you need (Mass Conservation and Continuity) but this is an easy equation that is also good to have memorized due to its general usefulness. Basically you only need to remember the unit conversion of 8.34 (lb/Mgal)/(mg/L).

If you would like more practice problems, please check out the rest of the playlist which this video is part of. Please note that newer versions of the reference manual may have been released since this video was recorded. The search terms are usually still correct, but the page numbers listed in the video will be different."

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