3. A solvent stream containing 0.06 kmol/mof a contaminant needs to be purified by passing it through a fixed bed containing activated carbon. Activated carbon would adsorb the contaminant but not the solvent. Assuming that the operation is isothermal, and that equilibrium is maintained between the liquid and the adsorbent, calculate the length of the bed. The fixed bed has a diameter of 0.15 m required to achieve continuous operation for 1h. The fluid is fed to the adsorber at 1 x 10-4 m3/s. The voidage between the adsorbent particles is 0.4. Assume that the bed is initially free of adsorbate. Use the equilibrium fixed bed theory to obtain an answer for the following isotherms: (1) Cs = 3C0.3 use the mean slope for the breakthrough concentration