It is desired to remove benzene from an aqueous waste stream at an industrial waste site that produces approximately 20,000 gallons of water per day with a pH of 5.3 and a benzene concentration of 2000μg/L. A batch adsorption system is to be used. A preliminary bench scale analysis was conducted to get the adsorption data of benzene on two types of carbons (I and II) at pH 5.3. The data are given below:
(i) Which isotherm (Freundlich or Langmuir) would better represent the data?
(ii) What is the maximum adsorption capacity of carbon I and II?
(iii) If the effluent water quality for benzene is 20μg/L, how much of carbon would be required per day? Which carbon type would you recommend?