PROBLEM 5 (Problem 16-9, Textbook) A small municipal water supply treats a maxim

Question

PROBLEM 5 (Problem 16-9, Textbook) A small municipal water supply treats a maximum daily flow of 5.0 ML/d, maximum weekly flow of 25 ML/wk, and a maximum nitrate concentration of 18 mg/L. The plant treats 5 ML of water and operates only 7 h per day and 5 days per week and there is sufficient storage capacity for the weekend demand. The treatment objective for the ion exchange process is 0.6 mg/L NO3-N and will be blended with untreated water at 18 mg/L NO3-N to produce a final product water of 8 mg/L or less NO3-N. With a standard of 10 mg/L as NO3-N, determine the flow rate of the ion exchanger and blending rate.

Explanation / Answer

a) Plant operates 5 days/week and 7 hours per day means 35 hours per week;

5 million litres is equal to 5000 cum.

Flow rate of the = 0.6*5000/35=85.71 cum/hr

b) blending rate=18*5+10*25=340*0.6=204mg/lit

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