Abstract
Performance of a novel prototype of a column-bed was evaluated for the removal of a potentially toxic Polycyclic Aromatic Hydrocarbon (PAH) - Benzo(b)fluoranthene (BbF) from the water. The column-bed was prepared using the pellets fabricated from a mixture of low-cost materials: Plaster of Paris (POP), Coconut coir and Zeolite. The pellets were coated with a unique combination of bioadsorbents (Chitosan and Alginic acid) for enhanced removal, greater stability, and reusability of pellets. The pellet based column- bed showed up to 91% removal efficiency during 120 min treatment time in graded concentrations ranging from 0.01 to 10.0 ppm. Evaluation of kinetic behavior of the column was performed through linear regression analysis by fitting the data into three well-known models: Thomas, Adams-Bohart, and Yoon-Nelson. The data showed good agreement between experimental and calculated values of adsorption capacity (qe) for all the models, however Adams-Bohart model fitted best to the data obtained. This report provides a novel design of a column bed-reactor for PAH removal from water. The pelleted form of packing material for column-bed is a unique approach to enhancing the column efficiency and reusability of the materials used for column-bed preparation.
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