摘要
土壤气相抽提技术(SVE)可有效去除非饱和土壤中的挥发性有机污染物。土壤透气率及气相抽提的影响半径是进行SVE系统设计的重要参数,可通过多种方法取得。文章通过在北京市某焦化厂进行SVE现场试验,监测系统运行的土壤气相压力变化,求取土壤透气率及抽气影响半径。监测结果表明:SVE系统运行后,土壤中气相压力降最初不断增大,可在某一时刻达到稳定;压力降以抽气井为中心,向外围逐渐减小,其压力降梯度也渐趋平缓。可在现场试验资料的基础上,利用公式或绘制真空度随距离变化的半对数曲线求取影响半径;利用公式或监测井真空度随时间变化的半对数曲线(直线图解法)确定土壤透气率。SVE现场试验土壤参数计算结果与经验值一致,说明现场试验方法是进行参数计算的有效方法。
Volatile organic contaminants can be removed from soil using technology of soil vapor extraction(SVE).This paper describes an on-site experiment of SVE used for contaminated soil remediation at a coking plant in Beijing,in which variation of soil vapor pressure is monitored and radius of influence(ROI)of soil permeability is calculated.Results of the field test are used to calculate the ROI and to determine air permeability of soil based on a formula or the data of monitoring wells which describe changes of vacuum against time.Values of soil data acquired are consistent with the empirical ones, which indicate the effectiveness of the field test method.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2011年第7期134-137,共4页
Environmental Science & Technology
基金
北京市科技计划课题(D08040900360803)
关键词
土壤气相抽提
影响半径
土壤透气率
真空度
soil vapor extraction(SVE)
radius of influence(ROI)
air permeability of soil
vacuum