饱和带地下水曝气修复技术研究进展

doi:10.11867/j.issn.1001-8166.2013.10.1154

地下水曝气修复技术是将压缩空气注入地下水饱和带, 提高污染场地内氧气浓度, 挥发及半挥发性有机污染物通过挥发、好氧降解等过程被去除。由于具有成本低、效率高且可原位施工等优点, 挥发性有机污染物地下水曝气修复技术近年来在国际上得到快速发展。在阐明地下水曝气修复基本原理的基础上, 首先对确定地下水曝气修复影响范围的方法及曝气过程空气流动形态可视化技术进行了总结, 接着系统分析了环境地质条件与施工工艺参数对修复效果的影响规律, 然后详细探讨了集总参数和多相流2种主要的地下水曝气修复理论模型。最后基于目前研究及工程实践中存在的问题对未来需开展的研究工作, 包括复杂场地条件下的强化修复方法、地下水曝气修复的微观机理研究以及相关设计施工规范的建立等, 进行了简要分析。

关键词: 环境岩土工程, 挥发性有机污染物, 地下水修复, 地下水曝气法, 饱和带

In situ air sparging involves injecting atmospheric air, under pressure, into the saturated zone to remove those volatile and semi-volatile organic groundwater contaminants and to promote their biodegradation by increasing subsurface oxygen concentrations. Due to the advantages of low cost, high efficiency and insitu constructability, groundwater Air Sparging (AS) technology has been quickly developed in the world recently. Based on the explanation of its remediation principle, literature review is done on the research advancement of air sparging technology mainly from three aspects. First, various methods for determination of the zone of influence and visualization techniques of air flow forms during air sparging are summarized. Then the influence of environmental geological conditions and construction technology parameters on the remediation effect of air sparging is systematically analyzed. Thereafter, two main types of air sparging theoretical models including lumped-parameter model and multiphase fluid flow model are discussed respectively in detail. Finally, based on the problems and difficulties existing in present research and engineering practice, several future tasks such as the enhancement remediation techniques in complex geological sites, microscopic intrinsic mechanisms, and establishment of related design and construction standards which require to be done are briefly analyzed.

Key words: Saturated zone, Volatile organic compounds, Air sparging, Groundwater remediation., Geoenvironmental engineering

中图分类号:

P641.8

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Advances in Air Sparging Technology of Saturated Zone