基于微流控技术的重质非水相液体氧化修复机理

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Abstract To elucidate pore-scale mechanisms governing the coupled process of multiphase flow, chemical reactions, and phase transformations during the oxidation remediation of dense non-aqueous phase liquids (DNAPLs), we conducted 48microfluidic experiments to investigate the trichloroethylene (TCE) oxidation by potassium permanganate (KMnO₄). The results show that when KMnO₄ concentration exceeded 3g/L, the manganese dioxide (MnO₂) solid products during TCE oxidation formed a "solid wall", which hindered the contact between MnO₄^- and TCE. Under such conditions, the residual TCE oxidation proceeded only via the slow penetration of KMnO₄ solution through the MnO₂ wall, where limited MnO₄^- was converted to Mn²⁺. As Mn²⁺ diffused out of the MnO₂ wall, it was re-oxidized to MnO₂ solid phase, creating a negative feedback loop and significantly reducing remediation efficiency. At KMnO₄ concentrations below 3g/L, the MnO₂ solid products were able to attach to the channel surfaces, permitting continuous reaction between MnO₄^- and TCE, thereby resulting in a higher remediation efficiency. The introduction of phosphate significantly suppressed the formation of MnO₂ solid products and improved remediation efficiency, with an optimal KMnO₄ concentration for TCE remediation determined to be 1~2g/L.

Key words： DNAPL oxidative remediation multiphase flow trichloroethylene microfluidics

Received: 25 January 2024

PACS:	X13
	X523

Corresponding Authors: 杨志兵,教授,zbyang@whu.edu.cn E-mail: zbyang@whu.edu.cn

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	WANG Ze-jun
	YANG Zhi-bing
	HU Ran
	CHEN Yi-Feng

Cite this article:

WANG Ze-jun,YANG Zhi-bing,HU Ran等. Pore-scale mechanisms of DNAPL oxidative remediation in a microfluidic device[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4530-4538.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I8/4530

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