16.1 A wastewater contains the following ions: CrOr = 120 mg/L, Cu =

30 mg/L, Zn2+= 15 mg/L, and Ni2+ = 20 mg/L . Calculate the total gmols of cations and anions, assuming the volume of the wastewater is 450 m .

16.2 A breakthrough experiment is conducted for a wastewater producing the results in the following table. Determine the packed density of the bed if 8 = 0.0012 m. The diameter of the column used is 2.5 cm. [Co] is equal to 2.20 meq/L. (X/M)utt = 6.5 meq/g.

C (meq/L)

Vx (L)

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