Question

The Freundlich isotherm constants (Table 13.2) and K = 190 (mg/g)(L/mg)^1/n, and 1/n = 0.33. The water to be treated has a chlordane concentration of 0.1 mg/L. Since the MCL is 0.002, you must design for an equilibrium concentration of 0.0005 mg/L. The flow rate is 1 MGD. Assume a carbon density of 30 lb/ft³, and a typical carbon column depth of 10 ft. The carbon contractors must provide one year of treatment before new carbon is needed. Specify the following:

a) total carbon mass (lb)

b) the number of columns and their diameter (ft)

c) the contact time in each column (min)

Note: 1 MGD = 694 GPM = 1.547 ft³/s.

Answer 1

fa rate Q= stLSl Gw T Corbon dausi 30lbp13 Co l n depn treaimentr x 365 x 60x60x24p ger Sol Ca To te Caroon man (M) 2 volunaf DO tuoaterr (0 brme) X 30 469 x10 b Thefr de mete 2coluun no Coluuns no. o ASa Trd2 depts cd Voume ge coluu 542 K365x 4 Y60Ybo lox Td xIo 78 (7 P eauh colunn, t contaur colunn Voluuee a diseharyi Q) X depi p 2 78.