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Modeling As(V) Removal in Iron Oxide Impregnated Activated Carbon Columns |
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| Authors: | Ronald L Vaughan Jr Brian E Reed Edward H Smith |
| Affiliation: | 1Ph.D. Graduate, Dept. of Civil and Environmental Engineering, E2509 Engineering Building East, Univ. of Missouri-Columbia, Columbia, MO 65211-2200. E-mail: ronvaughan@hotmail.com 2Professor, William and Lillian Hackerman Chair of Engineering, Dept. of Civil and Environmental Engineering TRC Building Room 278, Univ. of Maryland, Baltimore County, Baltimore, MD 21227 (corresponding author). E-mail: reedb@umbc.edu 3Professor, Dept. of Construction Engineering, The American Univ. in Cairo, 11511 Cairo, Egypt. E-mail: edsmith@aucegypt.edu |
| Abstract: | Iron oxide impregnated onto an activated carbon (FeAC) has a high arsenic (As) removal capacity with the potential to be used in existing activated carbon column systems. Objectives of this research were to investigate As(V) removal from aqueous-phase systems using fixed-beds packed with FeAC and to determine if the triple layer model (TLM) with the homogeneous surface diffusion model (HSDM) could describe As(V) removal in the columns. Rapid small-scale column tests (RSSCT) were conducted at various empty bed contact times (EBCT). Effluent As(V) breakthrough (10?μg/L) was incipient for the 0.20-min EBCT experiment, whereas ～ 2300 bed volumes of water at 1-mg/L inlet concentration of As(V) was treated at an EBCT of 2.1?min before breakthrough occurred. The TLM with three As(V)-FeAC surface reactions coupled with the HSDM provided accurate prediction of As(V) removal in the RSSCT. |
| Keywords: | Arsenic Activated carbon Columns |