Question

Drinking water treatment plants often add powdered activated carbon (PAC) to remove natural organic matter (NOM) through sorption. For a given treatment plant, the equilibrium sorption of NOM to activated carbon behaves according to the Freundlich isotherm with K_F = 16 (mg/g) (L/mg)^0.40 and n = 0.40. The activated carbon is completely mixed with the water and then allowed to settle out. a. How much activated carbon is needed each day to reduce the NOM concentration from 2 mg/L to 0.4 mg/L for a treatment plant treating 10 million gallons/day? 1 gal = 3.79. Give your answer in kg of activated carbon. b Why is NOM removal desirable prior to chlorination for disinfection?

Answer 1

0.40 daa 183.826 ka lda it redueing the grouth a6 micro -organism steps