REDUCTION OF AQUEOUS FREE CHLORINE WITH GRANULAR ACTIVATED CARBON.

A surface reaction rate expression was developed to describe the heterogeneous reaction between aqueous free chlorine and granular activated carbon. This expression was then incorporated into a pore diffusion model and the relevant partial differential equations with the corresponding boundary conditions were solved for the case of a constant concentration batch reactor and a closed batch reactor. The effect of particle size on the rate of removal of free chlorine was investigated both in batch and packed bed column form. The effect of pH on the rate of reaction was studied in the pH range of 4-10. Temperature effects were also studied in the range 2-35 degree C. The effect of temperature on the surface dissociation rate constant was found to correspond to the Arrhenius law.