饱和多孔介质中DNAPL污染源区结构及质量溶出

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Abstract To investigate the migration and dissolution of dense non-aqueous phase liquid (DNAPL) in groundwater, tetrachloroethylene (PCE) was selected as the representative in this study. The migration and distribution process of PCE in a two-dimensional (2-D) sandbox were dynamically monitored by light transmission method, while the PCE dissolution was determined using headspace gas chromatograph. Ethanol flushing was then performed to alter the PCE distribution in the sandbox, and the corresponding changes in source zone architecture and dissolution concentration were analysed. Results showed that the migration of PCE was mainly downwards vertical infiltration, accompanied by lateral spreading caused by capillary force. During the migration process, the changes of the PCE source area and the dissolved concentration were obviously consistent, both of which increased rapidly and then stabilized. Due to the small amount of leakage, 70.7% of the PCE was trapped in the migration path and existent as discontinuous ganglia. Ethanol flushing changed the source zone architecture mainly via solubilization, while it exhibited a weak influence on the spatial distribution of PCE. After being flushed with ethanol, the percentage of ganglia PCE increased to 99.6%, and the GTP value increased from 2.4 to 257. With the increase of ethanol flushing volumes, the PCE source zone area decreased from 100cm² to 50cm² and the dissolved concentration decreased from 114mg/L to 12mg/L, and the two showed a good relationship (R²=0.76). In addition, continuous monitoring results showed that in the current study, the source zone architecture and dissolution of PCE could remain stable for a certain period of time (at least 16PVs), regardless of whether it was flushed with ethanol or not.

Key words： DNAPL light transmission method migration source zone architecture dissolution

Received: 21 January 2019

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X523

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	Articles by authors
	WANG Hui-ting
	XU Hong-xia
	GUO Qiong-ze
	SHI Xiao-qing
	SUN Yuan-yuan
	WU Ji-chun

Cite this article:

WANG Hui-ting,XU Hong-xia,GUO Qiong-ze等. Dense non-aqueous phase liquid source zone architecture and dissolution in saturated porous media[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3474-3483.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3474

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