克拉玛依城市土壤的环境磁学特征研究

对克拉玛依市土壤环境磁学特征进行研究,并探讨土壤磁性增强的机制。结果表明:低频质量磁化率(χLF)在不同用地上依次表现为:交通运输用地>商业用地>林地>公共设施用地>未建设用地>居住用地。交通运输用地、公共设施用地较居住用地、非建设用地的土壤以低矫顽力的亚铁磁性矿物含量较高和少量不完全反铁磁性矿物,且磁性颗粒以多畴(MD)颗粒为主,含少量的单畴(SP)颗粒和稳定单畴(SSD)颗粒,与交通运输用地、公共设施用地受到汽车尾气和其他人为活动产生的污染物中含有大量的粗颗粒亚铁磁性矿物密切相关。

SECONDARY POLLUTION AND ITS PREVENTION OF VOC/SVOC-CONTAMINATED SITES WITH EX SITU REMEDIATION TECHNOLOGIES

The contaminated site remediation practice in Europe and America showed that organic pollutants were discovered in 60％ ～ 90％ contaminated sites,in which volatile organic compounds (VOC) and semivolatile organic compounds (SVOC) were the common contaminants in soil.Ex-situ remediation technologies conformed to current situation in China for VOC/ SVOC contaminated sites,but the secondary pollution was necessary to pay attention in remediation engineering practice.In this paper,the principles of soil vapor extraction,mechanical soil aeration,thermal desorption,soil washing,biopiles and cement kiln were introduced.The common secondary pollution in the process of ex-situ remediation technologies were extensively discussed,including excavation,removal,and stacking.Meanwhile,the secondary pollution of different technologies in repair process were also discussed,and the corresponding prevention methods were provided.This paper provided references for remediation of VOC/SVOC-contaminated sites in China and other developing countries.