原位空气扰动技术影响因素研究-基于苯污染非均质含水层

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Abstract

Column experiments were conducted to investigate the effects of different medium combinations on the benzene removal for contaminated groundwater by air sparging in the stratified heterogeneous aquifer. The results indicated that with the aeration flow 0.1L/min, the stratification changes of the aquifer had little effect on the removal efficiency of pollutants when the hydraulic conductivities (K) were in the same order of magnitude in the aquifer. When the hydraulic conductivities were not in the same order of magnitude, the larger K in lower part of the aquifer could cause obvious increase of contaminant content in the upper part during the early sparging period. While the smaller K in lower part of the aquifer made no big difference for the removal efficiencies between upper and lower part of the aquifer. In hierarchical cases, the combination of different media also affected the average benzene removal efficiencies. In the stratified heterogeneous aquifer, the air flow from the low permeable medium to high permeable medium, the removal rate of pollutants was relatively faster, and the average removal efficiency of pollutants mainly depended on the hydraulic conductivity of upper medium and the average contaminant removal efficiency of layered heterogeneous aquifer was roughly the same as the removal efficiency in upper layer medium.

Key words： air sparging heterogeneity hydraulic conductivity benzene removal efficiency

Received: 01 December 2017

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	Articles by authors
	KANG Xue-he
	YAO Meng
	QIN Chuan-yu
	ZHAO Yong-sheng

Cite this article:

KANG Xue-he,YAO Meng,QIN Chuan-yu等. Study on the influence factors of in situ air sparging based on benzene contaminated heterogeneous aquifer[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(7): 2580-2584.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I7/2580

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