Arsenic removal in fresh and NOM-preloaded ion exchange packed bed adsorption reactors

Arsenic speciation and removal in continuous-flow packed bed adsorption rea ctors was investigated using a strong base anion exchange resin as the adso rbent. Preloading of the media was investigated passing arsenic-free Lake W ashington water through columns packed with the resin prior to feeding infl uent spiked with arsenic. NOM preloading did not affect the systems, but su lfate adsorbed during the preloading and the subsequent adsorption steps ca used chromatographic displacement of the adsorbed arsenic. Significant arse nic speciation changes occurred in the arsenic-spiked feeding solution that need further investigation. (C) 1998 Published by Elsevier Science Ltd. Al l rights reserved.