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Rapid degradation of refractory organic pollutants by continuous ozonation in a micro-packed bed reactor

文献类型： 外文期刊

作者： Cao, Qiang 2 ; Sang, Le 1 ; Tu, Jiacheng 1 ; Xiao, Yushi 2 ; Liu, Na 2 ; Wu, Lidong 2 ; Zhang, Jisong 1 ;

作者机构： 1.Tsinghua Univ, Dept Chem Engn, State Key Lab Chem Engn, Beijing 100084, Peoples R China

2.Chinese Acad Fishery Sci, Key Lab Control Qual & Safety Aquat Prod, Minist Agr, Beijing 100141, Peoples R China

3.Shanghai Ocean Univ, Coll Food Sci & Technol, Shanghai 201306, Peoples R China

关键词： Micro-packed bed reactors; Continuous ozonation; Organic pollutants; Environmental-friendly degradation

期刊名称：CHEMOSPHERE （ 影响因子：5.778； 五年影响因子：5.705 ）

ISSN： 0045-6535

年卷期： 2021 年 270 卷

页码：

收录情况： SCI

摘要： Recently microreactor technology attracts attention due to the excellent multiphase mixing and enhanced mass transfer. Herein, a continuous ozonation system based on a micro-packed bed reactor (mPBR) was used to improve the dissolution rate of ozone and achieved a rapid and efficient degradation of refractory organic pollutants. The effects of liquid flow rate, gas flow rate, initial pH, initial O-3 concentration and initial phenol concentration on the phenol and chemical oxygen demand (COD) removal efficiencies were also investigated. Experimental results showed that phenol and COD removal efficiencies under optimal conditions achieved 100.0% and 86.4%, respectively. Compared with large-scale reactors, the apparent reaction rate constant in mPBR increased by 1-2 orders of magnitude. In addition, some typical organic pollutants (including phenols, antibiotics and dyes) were treated by ozonation in mPBR. The removal efficiencies of these organic pollutants and COD achieved 100.0% and 70.2%-80.5% within 71 s, respectively. In this continuous treatment system, 100% of the unreacted ozone was converted to oxygen, which promoted the healthy development of aquatic ecosystems. Thus, this continuous system based on mPBR is a promising method in rapid and efficient treating refractory organic pollutants. (C) 2020 Elsevier Ltd. All rights reserved.

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