土层性质和结构对气相抽提修复土壤中甲醛污染的影响  

Effect of Soil Layer Properties and Structure on Removal of Formaldehyde in Contaminated Soil by In-situ Vapor Extraction

作　　者：周礼洋 ZHOU li-yang(Shanghai Shenhuan Environmental Engineering Co.,Ltd.,Shanghai 200092,China;Shanghai Construction Engineering Environmental Technology Co.,Ltd.,Shanghai 200003,China)

机构地区：[1]上海申环环境工程有限公司,上海200092 [2]上海建工环境科技有限公司,上海200003

出　　处：《环境科技》2023年第3期23-29,共7页Environmental Science and Technology

基　　金：上海市2020年度“科技创新行动计划”扬帆计划项目(20YF1434800)。

摘　　要：为探究土层的性质和结构对土壤原位气相抽提修复的影响,对已搬迁某皮革加工厂遗留地块污染区域进行应用研究。结果表明,试验区域内不同土层的微观结构主要为片状,孔隙分布较多,主要为颗粒间孔隙类型。修复后土壤中甲醛浓度低于修复目标值。一阶衰减指数方程可较好地描述甲醛浓度变化过程,甲醛去除速率随土壤深度先增后降,且与孔隙比、中粒砂岩粒径、孔隙平均面积和孔隙分形维数均呈显著正相关,与细粒砂岩粒径呈显著负相关,孔隙分形维数对气相抽提去除速率影响最大,孔隙越大,去除甲醛效果越好。To investigate the effects of soil properties and structures on in-situ gas phase extraction remediation of soil,an application study was conducted on the contaminated area of a relocated leather processing factory.The results indicated that the microstructure of different soil layers in the experimental area was mainly sheet-like,with a large distribution of pores,mainly of the type of intergranular pores.After remediation,the formaldehyde concentration in the soil was lower than the remediation target value.The first-order decay index equation could better describe the change process of formaldehyde concentration.Formaldehyde removal rate first increased and then decreased with soil depth,and was significantly positively correlated with void ratio,medium sandstone content,average pore area,and pore fractal dimension.It was significantly negatively correlated with fine sandstone.The pore fractal dimension had the greatest impact on the gas phase extraction removal rate.The larger the pore,the better the removal effect of formaldehyde.

关 键 词：原位气相抽提 土壤性质与结构 甲醛去除过程 孔隙分形维数 

分 类 号：X5[环境科学与工程—环境工程]