Experimental study on degradation of organic wastewater in dielectric barrier discharge microreactor

化学工业与工程

Chemcial Industry and Engineering

2024, Vol. 41

Issue (6) :101-109 DOI: 10.13353/j.issn.1004.9533.20240513

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Experimental study on degradation of organic wastewater in dielectric barrier discharge microreactor

DING Yi, LIU Huiyang, YU Jianfeng, SUN Hui, WU Yongze

1. School of Mechanical Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China;
2. Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangsu, Wuxi 214122, China

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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.

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	DING Yi
	LIU Huiyang
	YU Jianfeng
	SUN Hui
	WU Yongze

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

Received 2024-06-08;

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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,V41(6): 101-109

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