Phenol present in an aqueous solution is to be removed by adsorption with activated carbon. The initial concentration of phenol in the solution is 0.25 kg/m. Three cubic meters of this solution is treated to reduce the phenol content to 10% of this value. Adsorption equilibrium is represented by the Freundlich isotherm = 0.2023 where q is the adsorbate loading, kg phenol/kg carbon and C is the concentration, kg phenolm of solution. Calculate (1) The quantity of fresh carbon required for single-stage adsorption (11) The quantity of carbon required in a two-stage counter current adsorption