CVEN3502 - Workshop - Fitration, adsorption, disinfection.pdf

CVEN3502 - Workshop - Fitration, adsorption, disinfection.pdf

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1 CVEN3502 Workshop Filtration, adsorption, disinfection QUESTION 1 (Adapted from Mines, Chapter 6, Q17) Determine the head loss for a clean filter bed with uniform particle diameter of 0.53 mm and porosity of 0.45. The rapid sand filter is made up of a 610 mm deep bed of sand, specific gravity of 2.65, shape factor ( ) = 0.82, temperature of 15 o C, and filtration rate of 1.70 L per second per square meter (L.s -1 m -2 ). Assume a fraction factor (f’) = 1400. QUESTION 2 Following lime softening, a drinking water was at pH 8. A treatment plant operator (who failed CVEN3502, but got a job anyway) failed to adjust the pH of this water prior to chlorine disinfection. The disinfection process involved the addition of sodium hypochlorite in sufficient quantity to achieve a free chlorine residual of 1 mg/L. a. Calculate the actual concentration of (dissociated) hypochlorous acid at pH 8.
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