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Treatability of volatile chlorinated hydrocarbon-contaminated soils of different textures along a vertical profile by mechanical soil aeration:A laboratory test 被引量:3
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作者 Yan Ma Yi Shi +6 位作者 Deyi Hou Xi Zhang Jiaqi Chen Zhifen Wang Zhu Xu Fasheng Li Xiaoming Du 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第4期328-335,共8页
Mechanical soil aeration is a simple, effective, and low-cost soil remediation technology that is suitable for sites contaminated with volatile chlorinated hydrocarbons(VCHs). Conventionally, this technique is used ... Mechanical soil aeration is a simple, effective, and low-cost soil remediation technology that is suitable for sites contaminated with volatile chlorinated hydrocarbons(VCHs). Conventionally, this technique is used to treat the mixed soil of a site without considering the diversity and treatability of different soils within the site. A laboratory test was conducted to evaluate the effectiveness of mechanical soil aeration for remediating soils of different textures(silty,clayey, and sandy soils) along a vertical profile at an abandoned chloro-alkali chemical site in China. The collected soils were artificially contaminated with chloroform(TCM) and trichloroethylene(TCE). Mechanical soil aeration was effective for remediating VCHs(removal efficiency 〉 98%). The volatilization process was described by an exponential kinetic function.In the early stage of treatment(0–7 hr), rapid contaminant volatilization followed a pseudofirst order kinetic model. VCH concentrations decreased to low levels and showed a tailing phenomenon with very slow contaminant release after 8 hr. Compared with silty and sandy soils, clayey soil has high organic-matter content, a large specific surface area, a high clay fraction, and a complex pore structure. These characteristics substantially influenced the removal process, making it less efficient, more time consuming, and consequently more expensive. Our findings provide a potential basis for optimizing soil remediation strategy in a cost-effective manner. 展开更多
关键词 Contaminated site Texture of soil profile Particle-size fraction volatile chlorinated hydrocarbons(VCHs) Mechanical soil aeration Treatability test
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