SVE技术中抽提真空度及相关参数的应用分析  

APPLICATION ANALYSIS OF EXTRACTING VACUUM AND RELATED PARAMETERS IN SVE TECHNOLOGY

作　　者：杜川[1,2] 陈素云 牛耕[1,2] 

机构地区：[1]北京市勘察设计研究院有限公司,北京100038 [2]北京市环境岩土工程技术研究中心,北京100038

出　　处：《环境工程》2017年第12期189-193,共5页Environmental Engineering

摘　　要：土壤气相抽提(SVE)技术在污染土壤修复中得到越来越广泛的应用。结合不同区域的地层条件,通过不同梯度的抽提真空度试验,分析了各因素的影响关系,并确定了相关参数来进行SVE系统设计。试验结果表明:抽气流量随抽提真空度提升而增大,但超过40 k Pa后,增大趋势缓慢;在地层均质情况下,试验井真空度与径向距离呈正相关,但非均质时,有可能出现距离远真空度反而高的情况;当抽提真空度为35 k Pa时,试验井真空度整体效果达到最优;利用公式法和直线图解法分别确定试验区土壤空气渗透率及影响半径,计算结果在经验值范围内,且符合试验区地质条件。对土壤气相抽提技术在实际应用层面进行了说明,为以后类似地层条件下污染场地的原位修复工程提供了技术及工艺参数参考。Soil vapor extraction（ SVE） technology was widely applied in contaminated soil remediation. Combined with the formation conditions of different regions,we analyzed relationships among various factors and determined related parameters for SVE system designingm through different extracting vacuum test. The experimental results showed that： extraction flux increased as extracting vacuum increased,but the increasing trend of extraction flux became slight when extracting vacuum exceed 40 k Pa; in homogeneous stratum,vacuum degree of test wells was proportional to the radial distance,however,sometimes adverse condition appeared in heterogeneities stratum; vacuum holistically achieved optimum when the extraction vacuum was 35 k Pa; the formula method and linear graphic method were used to obtain the air permeability and influencing radius,and the results were within the scope of the empirical value and conforming to the geological conditions in test area.The SVE application examples provided technical and technological parameters references for situ repair project of contaminated sites in similar geological conditions.

关 键 词：土壤气相抽提(SVE) 真空度 抽气流量 土壤气体渗透率 影响半径 

分 类 号：X53[环境科学与工程—环境工程]