Comparison of Permanganate Preoxidation and Preozonation on Algae Containing Water: Cell Integrity, Characteristics, and Chlorinated Disinfection Byproduct Formation

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• 作者：Pengchao Xie ; Jun Ma ; Jingyun Fang ; Yinghong Guan ; Siyang Yue ; Xuchun Li ; Liwei Chen
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：December 17, 2013
• 年：2013
• 卷：47
• 期：24
• 页码：14051-14061
• 全文大小：553K
• 年卷期：v.47,no.24(December 17, 2013)
• ISSN：1520-5851

文摘

Aqueous suspensions of Microcystis aeruginosa were preoxidized with either ozone or permanganate and then subjected to chlorination under conditions simulating drinking water purification. The impacts of the two oxidants on the algal cells and on the subsequent production of dissolved organic matter and disinfection byproducts were investigated. Preozonation dramatically increased disinfection byproduct formation during chlorination, especially the formation of haloaldehydes, haloacetonitriles, and halonitromethanes. Preoxidation with permanganate had much less effect on disinfection byproduct formation. Preozonation destroyed algal cell walls and cell membranes to release intracellular organic matter (IOM), and less than 2.0% integrated cells were left after preozonation with the dosage as low as 0.4 mg/L. Preoxidation with permanganate mainly released organic matter adsorbed on the cells鈥?surface without causing any damage to the cells鈥?integrity, so the increase in byproduct formation was much less. More organic nitrogen and lower molecular weight precursors were produced in a dissolved phase after preozonation than permanganate preoxidation, which contributes to the significant increase of disinfection byproducts after preozonation. The results suggest that permanganate is a better choice than ozone for controlling algae derived pollutants and disinfection byproducts.