A pilot-scale evaluation of magnetic ion exchange treatment for removal of natural organic material and inorganic anions |
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Authors: | Boyer Treavor H Singer Philip C |
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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 |
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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. |
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Keywords: | Anion exchange Magnetic ion exchange Natural organic material Bromide Sulfate Pilot plant Effective resin dose |
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