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Arsenic Removal by Iron Impregnated Resin Beads

B.E. Reed and L. LeMire
Unv of Maryland-BC, US

Keywords:
arsenic, iron oxide, ion exchange, diffusion

Abstract:
New and efficient adsorption/ion exchange materials are needed to meet the new As Maximum Contaminant Level (MCL) of 10 ppb. Granular ferric hydroxide (GFH) is a popular material for Arsenic removal but suffers from lack of durability and diffusion issues (very slow kinetics). The slow kinetics necessitates long contact times and poor durability increases head losses through the column. To address these issues, an iron impregnated on exchange material was developed that was hypothesized to be more durable and have much improved kinetics. Adsorption experiments were conducted using the NSF challenge waters. The ion exchange material had a similar capacity to GFH on a Fe basis. Competitive adsorption with silica and phosphate was investigated. Batch kinetics were much improved over the GFH. Rapid small scale column tests were conducted and the bed volumes treated at breakthrough (10 ppb) at low empty bed contact times were higher for the ion exchange material. Film and surface diffusion coefficients were developed for the two materials.

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