Abstract:Surfactants have the potential to clean up the crude oil contaminated soil owing to their excellent properties of solubilization and emulsification. Here, the elution efficiency of crude oil and Benz[a]anthracene from soil by 11 kinds of surfactants including anionic, cationic, and non-ionic surfactants were examined using batch elution experiments. According to the elution efficiency, better anionic and nonionic surfactants were selected and mixed, and then, the influence of mass ratio, concentration of mixed surfactants, liquid soil ratio (L/S), temperature and the species of the added inorganic salts on elution efficiency of Benz[a]anthracene in contaminated soil were investigated in the experiment. The results showed that, for single surfactant, SDS, Tw80 and TX100 had greater effects on Benz[a]anthracene and crude oil elution test, and the elution rates of Benz[a]anthracene were 85.3%, 74.3% and 67.9% under the condition of concentration of 10 g/L and liquid soil ratio of 40︰1, meanwhile, the elution rates of crude oil were 65.3%, 57.6% and 67.3% under the concentration of 6 g/L and liquid soil ratio of 20︰1, respectively. The solubilization of Benz[a]anthracene could be increased significantly by SDS-Tw80 mixed surfactants. The elution rate of Benz[a]anthracene could be up to 84.5% when the concentration and the mass ratio of SDS-Tw80 were 6 g/L and 6︰4, the liquid soil ratio (L/S) was 20︰1, the concentration of sodium carbonate as additive was 0.02 mol/L.