ABSTRACT
ABSTRACT: Various technologies have been evaluated for removal of arsenic from the groundwater. Ion exchange using anion exchange resins is used primarily for water treatment with low amounts of sulfate. Oxidation of this form to As(V) is required before removal. In addition, the production and disposal of spent regenerants and media has also not been studied extensively. Although residual production needs to be minimized as much as possible, there is inadequate data regarding the amounts and compositions of the residuals generated by ion exchange processes and methods for disposal. This study involves the optimization of the ion exchange process and the conditions for regeneration of the ion exchange media. Removal efficiency increased as the pH decreased from 8.5 to 6.5, concentration increased from 500 to 1600 ppb and velocity decreased from 1.94 cm/min to 0.65 cm/min. Regeneration of the ion exchange media enabled desorption of 97% of the adsorbed arsenic.
