Study on Chemical Pre-Oxidation Enhanced Coagulation for Micro-Polluted Raw Water Treatment

Abstract:

The present paper studied the enhanced effects of O₃ and KMnO₄ as chemical oxidants on traditional coagulation for micro-polluted raw water treatment. Results showed that pre-oxidation using either ozone or KMnO₄ could effectively improve the removal of turbidity and organic matters by coagulation. Compared with mere coagulation by polyaluminium chloride (PAC), pre-oxidation using 2 mg/l O₃ for 20 minutes could increase the removal rates of both turbidity and total organic carbon by 5.33% and 5.06%. However, the effectiveness of pre-oxidation using KMnO₄ was not as significant as that using O₃. Besides the direct mineralization of small organic molecules into CO₂ and H₂O, O₃ and KMnO₄ could also destroy complex macromolecules in raw water. Therefore, the SUVA value of the effluent decreased markedly after the pre-oxidation and the subsequent coagulation. Based on these results, the process of chemical pre-oxidation enhance coagulation were expected to reduce the disinfection by-products formation potential.

• Periodical: Advanced Materials Research (Volume 777)
• Pages: 472-475
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.777.472
• Online since: September 2013
• Authors: He Zhao, Liang Wang, Zhao Hui Zhang, Bin Zhao, Hong Wei Zhang, He Zhang, Rui Ma
• Keywords: Coagulation, Drinking Water, Ozone, Potassium Permanganate, Pre-Oxidation

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