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.