6 A water containing 2 mg/L TCE is purified in a fixed bed packed with adsorbent of Ambersorb 563 which has the adsorption isotherms shown in the figure below. The bed length is 3 ft and the bed bulk density is 0.53 g/cm. The flow rate of the wastewater is 6 gal/ft-min. The regeneration efficiency of the absorbent by steam is 85%. (a) Estimate the breakthrough time if the length of the unused bed is 0.8 ft. (b) Calculate the water treated by a unit bed volume at the breakthrough point. 500 100 TCE 50 Adsorption capacity (mg/g) 10 TCE CHCl3 CHCI 5 Ambersorb 563 GAC 1 0.01 0.1 1 10 102 Concentration, mg/L For question 3-7 Adsorption isotherms for trichloroethylene (TCE) and chloroform (CHCI) in water solution, on Ambersorb 563 and granular activated carbon (GAC)