Study on the removal of dissolved organic matters in the raw water by a new magnetic anion-exchange resin

Abstract

The removal of dissolved organic matters (DOM) in the raw water of Tongyu River using a new magnetic anion-exchange resin (NDMP) was investigated. NDMP was more effective than a commercial magnetic ion-exchange resin (MIEX) for the purification of drinking water. NDMP can eliminate 49% of dissolved organic carbon (DOC) and 86% of UV absorbance at 254 nm (UV₂₅₄) in the raw water within 30 min. During multiple-loading jar tests, DOC of the effluent was 2.1 mg/L at 100 BV and increased to 3.0 mg/L after the loading of 1,200 BV by NDMP treatment. The saturated resin was renewed after regeneration with sodium chloride. NDMP displayed high removal ability for both hydrophobic acid (HPO) and transphilic acid (TPI) compared to MIEX resin, whereas the removal rate of hydrophilic (HPI) was relatively low. The removal rates of HPO, TPI, and HPI in the raw water at the NDMP amount of 10 mL/L were 62, 65, and 24%, respectively. Therefore, the NDMP resin can be used in the purification of drinking water at high DOC level.

Keywords:

• Ion exchange
• Dissolved organic matter
• Magnetic anion-exchange resin
• Drinking water treatment

Acknowledgments

We gratefully acknowledge the generous support provided by Program for Changjiang Scholars and Innovative Research Team in University, NSFC (51178215 and 51378251) and Jiangsu Nature Science Fund (BK2011032) P. R. China.