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