挥发性有机物污染土壤蒸气抽排模型研究进展

土壤蒸气抽排是一种当前国外广泛应用的土壤现场修复技术,它能经济高效地去除非饱和带土壤中的挥发性有机污染物。本文详细叙述了土壤蒸气抽排中的地下抽排气体流场模型和污染物去除模型的发展过程和研究现状;描述了适合不同情况的一维、二维和三维抽排气体流场模型,以及不存在非水相液体和存在非水相液体的两类污染物去除模型的特点和适用条件;总结了运用各种模型,分析土壤气透性、污染物挥发性和抽排流速等主要因素对土壤蒸气抽排去污效果的影响及所取得的研究成果;对土壤蒸气抽排模型的研究和运用中目前需要解决的问题及发展前景进行了展望。

MODELS OF SOIL VAPOR EXTRACTION FOR SOIL CONTAMINATED BY VOLATILE ORGANIC COMPOUNDS

Soil vapor extraction (SVE) is a cost-effective in-situ soil remediation technology being used widely abroad for removing volatile organic compounds (VOCs) from soil in the unsaturated zone. This paper reviews the development and status of the models of gas flow fields and the models of contaminants transport in SVE; describes the characteristics and applicable conditions of one-, two-, and three-dimensional models of gas flow fields and the models of contaminants transport with or without non-aqueous liquid; analyzes the effects of soil permeability, contaminants volatility, and air flow rate on SVE, using the models, summarizes results of the research; and discusses problems that needs immediate solution and prospect of the research and use of the models.