| 臭氧-混凝交互作用对混凝效果的影响 |
| 摘要点击 2315 全文点击 1023 投稿时间：2014-12-29 修订日期：2015-03-20 |
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| 中文关键词 预臭氧 混凝 臭氧 消毒副产物生成势 交互作用 |
| 英文关键词 preozonation coagulation ozone disinfection by-products formation potentials interaction |
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| 中文摘要 |
| 采用臭氧-混凝联用(臭氧与混凝剂同时投加)和预臭氧混凝(预臭氧后待水中臭氧浓度为0后再投加混凝剂)两种方式处理水样,分析其氧化、混凝效果和消毒副产物生成势(DBPFP)等的差异,研究臭氧-混凝交互作用对处理效果的影响. 结果表明,联用和预臭氧混凝效果之间存在明显差异. 联用工艺中臭氧与混凝剂间发生交互作用,导致混凝剂水解形态分布发生改变是影响混凝效果的重要原因. 联用处理后水样的浊度高于预臭氧混凝,主要原因之一在于臭氧降低了混凝剂水解形态分布中Alb的含量; Cl-DBPFP低于预臭氧混凝出水,是混凝剂AlCl3及其某些水解形态对臭氧具有催化氧化的作用,促进了消毒副产物前驱物的氧化降解所致. 联用对MCAA和CF生成势的去除效果显著强于预臭氧混凝,其中MCAAFP分别为5.6μg ·L-1和16.9μg ·L-1,CFFP分别为12.5μg ·L-1和24.1μg ·L-1. 臭氧与混凝剂交互作用显著影响混凝效果及消毒副产物的生成,是臭氧和混凝配合使用安全性研究中需要重点关注的内容. 因而,相关科研和实际水处理工艺中必须明确预臭氧及混凝剂投加位点和相对次序. |
| 英文摘要 |
| Two strategies, ozonation-coagulation combination (OCC, ozone and coagulant dosed at meantime) and preozonation coagulation (PC, coagulant dosed after ozone died away) were used to treat synthesized water. Different effects of oxidation and coagulation, disinfection by-products formation potentials (DBPFP) in the same water were detected in order to study the influence of interaction of ozonation and coagulation (IOC) on treated water characteristics. Results show that there are remarkable differences between OCC and PC. IOC effects take place during OCC process, which results in variations of the distribution of hydrolyzed species of coagulant. And this is an important reason which impairs efficiency of coagulation. Turbidity after OCC was higher than that of PC. One of the main reasons is that ozone reduced the content of Alb species which was built during coagulant hydrolyzation. Cl-DBPFP in OCC outlet water were lower than those in PC because oxidized destruction of DBP precursors were enhanced by catalyzed ozonation by AlCl3 along with its other hydrolyzed species. Removals of MCAA and CF formation potentials by OCC were significantly higher than those by PC, MCAAFP were 5.6μg ·L-1 and 16.9μg ·L-1 respectively,and CFFP were 12.5μg ·L-1 and 24.1μg ·L-1 respectively. Coagulation results and DBP formations are significantly affected by interaction of ozonation and coagulation; and it should be a noticeable point of water safety if ozonation and coagulation are employed together. Thus times and spots between ozone and coagulant should be defined clearly in correlational researches and water treatment application. |
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