title: A pilot-scale evaluation of magnetic ion exchange treatment for removal of natural organic material and inorganic anions.
abstract: The objective of this research was to evaluate a magnetic ion exchange process (MIEX) for the removal of natural organic material (NOM) and bromide on a continuous-flow pilot-scale basis under different operating conditions and raw water characteristics. The most important operating variable was the effective resin dose (ERD), which is the product of the steady-state resin concentration in the contactor and the regeneration ratio. The raw water employed in this study had a moderate concentration of ultraviolet (UV)-absorbing substances and dissolved organic carbon (DOC), and a low turbidity, alkalinity, and concentration of competing anionic species. Experiments were conducted using the ambient raw water and raw water spiked with bromide, chloride, and sulfate. Substantial removal of UV-absorbing substances and DOC was achieved at ERDs as low as 0.16mL/L. Moderate bromide removal was achieved, depending on the ERD. Increasing the sulfate concentration resulted in decreased removal of UV-absorbing substances, DOC, and bromide. Consistent results were observed between the continuous-flow pilot plant tests and batch equilibrium studies.
authors.affiliation: Department of Environmental Sciences and Engineering, School of Public Health, University of North Carolina at Chapel Hill, 27599-7431, USA. tboyer@email.unc.edu
authors.forename: Treavor H
authors.initials: TH
authors.lastname: Boyer
authors.forename: Philip C
authors.initials: PC
authors.lastname: Singer
mesh_terms: D000327:Adsorption; D000534:Alum Compounds / Q000494:pharmacology; D000838:Anions / Q000737:chemistry*; D001965:Bromides / Q000032:analysis; D002623:Chemistry Techniques, Analytical / Q000379:methods; D002712:Chlorides / Q000032:analysis; D002852:Chromatography, Ion Exchange / Q000379:methods*; D010865:Pilot Projects; D013431:Sulfates / Q000032:analysis; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*; D014881:Water Supply
chemical_list: D000534:Alum Compounds; D000838:Anions; D001965:Bromides; D002712:Chlorides; D013431:Sulfates; D014874:Water Pollutants, Chemical; D014867:Water; C041524:aluminum sulfate