臭氧微气泡处理有机废水的效果与机制

doi:10.16085/j.issn.1000-6613.2021-0070

化工进展 ›› 2021, Vol. 40 ›› Issue (12): 6907-6915.DOI: 10.16085/j.issn.1000-6613.2021-0070

臭氧微气泡处理有机废水的效果与机制

杜明辉¹^,²(), 王勇¹^,², 高群丽², 张耀宗¹, 孙晓明¹()

^1.中国环境科学研究院国家环境保护生态工业重点实验室，北京 100012
^2.华北理工大学建筑工程学院，河北唐山 063000

收稿日期:2021-01-12 修回日期:2021-03-12 出版日期:2021-12-05 发布日期:2021-12-21
通讯作者: 孙晓明
作者简介:杜明辉（1991—），男，硕士研究生，研究方向为水污染控制与废水资源化。E-mail：425490008@qq.com。
基金资助:
国家水体污染控制与治理科技重大专项(2017ZX07402002)

Mechanism and efficiency of ozone microbubble treatment of organic wastewater

DU Minghui¹^,²(), WANG Yong¹^,², GAO Qunli², ZHANG Yaozong¹, SUN Xiaoming¹()

^1.Chinese Research Academy of Environmental Sciences State Environmental Protection Key Laboratory of Ecological Industry, Beijing 100012, China
^2.School of Architecture and Civil Engineering, North China University of Science and Technology, Tangshan 063000, Hebei, China

Received:2021-01-12 Revised:2021-03-12 Online:2021-12-05 Published:2021-12-21
Contact: SUN Xiaoming

摘要/Abstract

摘要：

为解决臭氧氧化有机废水氧化效率差、臭氧利用率低这一问题，本文提出了臭氧微气泡处理有机废水的新技术。采用加压溶气法制备的臭氧微气泡处理苯酚配置的模拟废水，通过显微拍摄、动力学分析、紫外-可见吸收光谱、自由基屏蔽等手段对臭氧微气泡的形态大小、氧化效果、传质特性和氧化机制进行了研究，并对臭氧气泡直径和界面压力之间的关系进行了深入探讨。试验与数值计算表明，臭氧微气泡平均粒径为20.37μm，处理初始COD浓度为51.2mg/L的有机废水，COD去除速率分别是使用1μm曝气头和100μm曝气头曝气的1.59倍和3.61倍，臭氧利用率达到99.19%以上，氧化过程是自由基为主的间接氧化过程，污染物最终氧化产物为小分子烃和羧酸。微气泡影响下，臭氧分子传质速率和分解速率均有所提高，而臭氧微气泡表面较高的界面压力是其高效传质的原因之一。

关键词: 臭氧, 微气泡, 废水处理, 传质, 动力学

Abstract:

In order to solve the problems of poor oxidation rate and low utilization of organic wastewater ozonation treatment, a new technology of ozone microbubble was proposed. The microbubbles were prepared by pressure dissolved gas method and the organic wastewater were composed of phenol. The morphology size, oxidation effect, mass transfer characteristics and oxidation mechanism of ozone microbubbles were studied by means of microphotography, kinetic analysis, UV-vis absorption spectrum and free radical shielding. The relationship between ozone bubble diameter and interfacial pressure was also discussed in detail. Experimental and numerical results indicated that the average particle size of ozone microbubble was 20.37μm, the COD removal efficiency could reach 89% within 40min, the reaction rate could reach up to 3.61 times of aerator aeration, and the ozone utilization efficiency achieved was more than 99.19%. Oxidation process was an indirect oxidation process dominated by free radicals, and the final oxidation products of pollutants were small molecular hydrocarbons and carboxylic acids. Under the influence of microbubbles, the mass transfer rate and decomposition rate of ozone were increased. At the same time, higher interfacial pressure on the surface of ozone microbubbles was one of the reasons for their high mass transfer efficiency.

Key words: ozone, microbubble, waste treatment, mass transfer, kinetics

中图分类号:

X703

杜明辉, 王勇, 高群丽, 张耀宗, 孙晓明. 臭氧微气泡处理有机废水的效果与机制[J]. 化工进展, 2021, 40(12): 6907-6915.

DU Minghui, WANG Yong, GAO Qunli, ZHANG Yaozong, SUN Xiaoming. Mechanism and efficiency of ozone microbubble treatment of organic wastewater[J]. Chemical Industry and Engineering Progress, 2021, 40(12): 6907-6915.

图/表 10

图1 加压溶气法制备微气泡1—隔膜泵；2—溶气罐；3—释气头

图2 实验装置1—氧气瓶；2—臭氧发生器；3—臭氧浓度检测器；4—气体流量计；5—调节阀；6—微气泡发生器；7—释气头；8—干燥器；9—尾气破坏器；10—微气泡

图3 微气泡表征结果

图4 COD去除率随时间变化情况

图5 不同曝气方式COD/O3和臭氧利用率随时间变化情况

图6 废水COD随时间变化情况拟一级动力学拟合结果

图7 液相臭氧浓度随时间的变化情况

图8 臭氧微气泡氧化反应过程紫外-可见吸收光谱

图9 不同曝气方式下叔丁醇对COD去除率影响

图10 臭氧微气泡中界面压力对于传质与氧化作用影响的理论分析

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臭氧微气泡处理有机废水的效果与机制

Mechanism and efficiency of ozone microbubble treatment of organic wastewater

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