Modeling Selenite Breakthrough with the Pore Surface Diffusion Model in Iron Coated Granular Activated Carbon Packed Bed Columns
Abstract:Iron coated granular activated carbon (Fe-GAC) has been proven to be effective for removing selenite from aqueous solution in batch studies. Design and use of the adsorbent in column settings require understanding the key mass transfer characteristics, which are required for full-scale applications. In this study, rapid small-scale column tests (RSSCTs) were conducted at various empty bed contact times (EBCTs). Pore and surface diffusion model (PSDM) was introduced to predict selenite breakthrough curves of continuous flow packed columns containing iron coated granulated activated carbon. Effluent Se(IV) breakthrough was incipient immediately in the experiment with 0.055-min EBCT, whereas about 780 bed volumes of water at 1.0 mg/L initial concentration of Se(IV) was treated at an EBCT of 0.447 min before breakthrough occurred. The adsorption capacity was estimated using the Freundlich isotherm model. The adsorption results of the selenite on Fe-GAC columns demonstrated that the PSDM can predict the column performance satisfactorily. Full scale column design criteria, such as hydraulic loading rate (HLR), carbon usage rate (CUR), and degree of column utilization (DoCU) were calculated and recommended.
Document Type: Research Article
Publication date: January 1, 2010
More about this publication?
- Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Ingenta Connect is not responsible for the content or availability of external websites