介质阻挡放电微反应器有机废水降解实验研究

摘要有机废水由于其难降解的特性,对环境造成了严重威胁,现有的有机废水降解方法存在气液混合效果差、放电电压高等问题。因此,设计了一种集微流控和介质阻挡放电于一体的新型降解装置,以亚甲基蓝(MB)作为模拟污染物,探究了液体流速、气液比、电极面积、阻挡介质厚度和放电电压对MB降解率的影响,对比了不同降解体系下的MB降解率变化并对·OH贡献率进行了定量分析。实验结果表明,在一定范围内提高液体流速与气液比有助于提高MB降解率,提高电极面积、降低阻挡介质厚度可提高MB降解率,适当加大放电电压有利于MB降解率的提高。在气液两相微放电微气泡体系,MB溶液浓度0.04 mmol·L^-1,液体流速3 mL·min^-1,气液比2.85∶1.00,电极面积9 000 mm²,放电电压9.5 kV,阻挡介质厚度6 mm的条件下循环工作15 min,MB降解率达到91.7%,·OH贡献率达68.9%,降解效果优于其他体系。可以增强气液传质效果,促进以·OH为主的间接氧化反应,为有机废水的降解处理提供一种可行的途径。

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	丁艺
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	吴永泽

关键词：气液两相放电微流控微气泡亚甲基蓝降解

Abstract： Organic wastewater poses a serious threat to the environment due to its difficult degradation. The existing methods of organic wastewater degradation have problems such as poor gas-liquid mixing effect and high discharge voltage. Therefore, a degradation device integrating microfluidic and dielectric barrier discharge was designed. Using methylene blue (MB) as a simulated pollutant, the effects of liquid flow rate, gas-liquid ratio, electrode area, barrier medium thickness and discharge voltage on MB degradation rate were investigated. The change of MB degradation rate under different degradation systems was compared and the contribution rate of ·OH was quantitatively analyzed. The experimental results showed that the degradation rate of MB was improved with the increase of the liquid flow rate and gas-liquid ratio in a certain range. With the increase of the electrode area and the discharge voltage, while the decrease of the thickness of barrier medium, all had positive effects on the degradation rate of MB. Under the conditions of a gas-liquid two-phase micro-discharge microbubble system, with an MB solution concentration of 0.04 mmol·L^-1, a liquid flow rate of 3 mL·min^-1, a gas-liquid ratio of 2.85∶1.00, an electrode area of 9 000 mm², a discharge voltage of 9.5 kV, and a barrier medium thickness of 6 mm, a 15-minute cyclic operation, an MB degradation rate of 91.7% and an ·OH contribution rate of 68.9% were achieved, demonstrating superior degradation performance compared to other systems. This method can enhance the effect of gas-liquid mass transfer, promote the indirect oxidation reaction dominated by ·OH, and provide a feasible way for the degradation treatment of organic wastewater.

Keywords： gas-liquid two-phase discharge microfluidic microbubbles methylene blue degradation

Received 2024-06-08;

Fund:江苏省研究生科研与实践创新计划(KYCX23_2553);江苏省高等学校大学生创新创业训练计划项目(202310295087E)。

Corresponding Authors: 俞建峰,教授,E-mail:robotmcu@126.com。 Email: robotmcu@126.com

About author: 丁艺(1999—),男,硕士研究生,现从事等离子体微反应器方面的研究。

引用本文:

丁艺, 刘汇洋, 俞建峰, 孙辉, 吴永泽.介质阻挡放电微反应器有机废水降解实验研究[J]. 化学工业与工程, 2024,41(6): 101-109

DING Yi, LIU Huiyang, YU Jianfeng, SUN Hui, WU Yongze.Experimental study on degradation of organic wastewater in dielectric barrier discharge microreactor[J]. Chemcial Industry and Engineering, 2024,41(6): 101-109

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