水处理中臭氧氧化技术有机物氧化原理解析

Organic Matter Oxidation Mechanism in Ozonation Process of Water Treatment:A Review

随着我国大力推进生态文明建设,废水排放标准不断提高,,氧化技术由于其较强的氧化性和脱色能力受到广泛关注。文章总结了O_(3)的基本性质及其在水中的分解过程,伴随产生的活性物种(O^(-)、O_(2)^(-)、O_(3)^(-)、HO_(2)·、HO_(3)·、HO_(2)^(-)等)主要为·OH产生的链式反应传递者,起主要氧化作用的为·OH;阐述了O_(2)分子和·OH氧化有机物的反应历程和特点,即O3分子通过环加成或亲电取代反应与不饱和有机物发生反应,与饱和有机物的反应速率极低;·OH通过攫氢反应氧化饱和有机物、通过羟基加成氧化不饱和有机物,反应速率均极快。文章为O_(3)氧化技术在废水深度处理领域的应用,如适用废水类型、后续处理单元选择、催化剂开发等方面提供了理论支持。

Along with the vigorous promotion of ecological civilization construction and the continuous improvement of wastewater discharge standards,ozone(Os)oxidation technology has attracted wide attention because of its strong oxidation and decolorization ability.In this paper,the properties of O;and its decomposition in water were summarized.It was shown that the dominant oxidation specie was hydroxyl radical(-OH)although various reactive oxygen species(O°-,O_(2)^(-),O_(3)^(-),HO_(2),HO_(3)·,HO_(2)^(-),and so on)were produced accompanied with O_(3),decomposition.Oxidation mechanisms of organic matter in water by molecular O,and OH were reviewed.For molecular O3,unsaturated organic compounds were oxidized by cycloaddition or electrophilic substitution,while the oxidation rate of saturated organic compounds was extremely slow.For·OH,unsaturated organic compounds were oxidized by hydroxyl addition,while saturated organic compounds were oxidized by hydrogen abstraction reaction,and reaction rates of them were both fast,Based on the analysis,the key process in application of ozonation in wastewater advanced treatment was formation of-OH.Therefore,the research of economical and efficient catalysts would be a hotspot.The review of organic matter oxidation mechanism in ozonation process of water treatment provides theoretical support for the application of ozonation technology in the advanced treatment of industrial wastewater,such as applicable wastewater type,subsequent treatment unit selection,and catalyst development.