Aiming at the problem of soil oil pollution,the leaching effects of 8 single surfactants and 4 composite surfactants on petroleum hydrocarbons are studied by single variable method,and the leaching conditions are optimized.The results show that the composite surfactant sodium dodecyl sulfate(SDS)with a mass ratio of 1∶2∶2,lecithin and polyoxyethylene sorbitan monooleate(Tw80)are more suitable for the remediation of medium and high concentration petroleum contaminated soil.The optimum leaching conditions are as follows,concentration 10 g/L,pH value 5,liquid-solid ratio 1 5∶1,temperature 50℃,oscillation time 3 h.There is no obvious loss of nutrients in the soil before and after leaching.
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