Consider an effluent containing Blue Dye BF 5 G with a concentration of 75 mg/L being fed into a 15 cm adsorption column with 3 g of activated carbon at a flow rate of 5 mL/minute. Calculate the adsorption capacity at the saturation point and determine the unused (non-useful) height of the bed based on the breakdown concentration of C/C₀=0.05. Time versus Concentration data are listed below:

Table 2: Dye concentration as a function of time.

T(h) 0 2 5 7 10 15 20 25 C (mg/L) 0 0 0 0,5 35 72 74 75