In present study, alkyl polyglucosides (APGs) as green surfactants, were tested in washing weathered crude oil contaminated soil with a high oil concentration (123mgg -1 soil) from Jilin Oilfield, northeast of China. APG1214, with longer alkyl chain, was more effective in removing crude oil than APG0810. The oil removal was improved by adding inorganic sodium salts into APG1214 solutions, and a best inorganic salts formula was obtained. To optimize the washing conditions, the effects of different washing parameters were investigated,and the values of the parameters were optimized.At the optimized conditions, 81.0% of the crude oil was removed with 1.5% APG1214 solution, while the crude oil removal efficiency of the deionized water was only 30.1%; the addition of inorganic salts further improved the removal efficiency to 97.4%. The kinetics of the washing process and the synergistic effect of the surfactant and the inorganic salts were investigated.
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