Reduction of Aqueous Free Chlorine with Granular Activated Carbon.

摘要

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 (1) a constant concentration batch reactor and (2) a closed batch reactor. The solutions were then compared to similar batch data in order to evaluate the pore model constants. A packed bed reactor model was then solved using the rate information from the batch mathematical models and experimental data. The predicted results from the packed bed model were then compared to experimental results. 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. The pH affects the rate insofar as it affects the distribution of free chlorine between OCl(-) and HOCl. Temperature effects were also studied in the range 2 -35C. The effect of temperature on the surface dissociation rate constant corresponds to the Arrhenius law.