Using Chlorine Dioxide to Remove the Fouling of Ultrafiltration Membrane and Control Disinfection By-Products
✍ Scribed by Shu-Hai You; Chia-Yu Tsai
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 249 KB
- Volume
- 39
- Category
- Article
- ISSN
- 1863-0650
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✦ Synopsis
Ultrafiltration (UF) can remove natural organic matter (NOM) effectively. Moreover, chlorine dioxide (ClO 2 ) has been an alternative disinfectant as it forms fewer disinfection by-products with NOM than chlorination does. Therefore, combining ClO 2 with UF may improve conventional purification processes. In this study, feed water containing humic acid with 4.07 mg/L total organic carbon (TOC) was dosed directly with various amounts of ClO 2 (0, 2, 5, 10, and 15 mg/L) before being filtered through a 5-kDa UF membrane. With a low dose (2 mg/L ClO 2 ), UF removed humic acid effectively, as TOC was not detected in the permeate, and the permeate flux increased to about 80% of the initial permeate flux by cross flow. Moreover, the concentrations of ClO 2 À , ClO 3 À , and trihalomethanes in the permeate were below the United States Environmental Protection Agency guidelines.