The Experiment Of Remediation Of PAHs Contaminated Soil Using Mixed Surfactant Solubilization Elution

This paper in view of the PAHs contaminated plant,we choose Phen and Py as the target pollutants,APG and SDBS mixed according to different ratio.Investigate the mixed behavior,studied solubilization elution of Phen and Py.the results are as follows:(1)Investigate the mixed behavior of the APG/SDBS distribution system: With the increase of ?,the ? and CMC of the combined systems decrease first and then rise,when ? = 0.4,the CMCmin=200mg/l;When ??0.4,CMC of the combined systems are lower than single system.when ??0.7,the CMCexp are lower than ideal CMC *,show the combined systems are much more obvious synergistic effect.(2)Investigate the solubilization effect of Phen and Py: With the increase of total concentration,Sw and Sw/S *of Phen and Py increase;With the increase of ?,the Sw?Sw/S * of Phen and Py decrease first and then rise,when ? = 0.4,maximum value,when ? = 1,minimum value.When the ? = 0.2,0.3,0.4,the MSR of Phen and Py significantly higher than the other.Sw and MSR of Phen are higher than Py,but Sw/S * is lower than Py.When the temperature increased from 10 ? to 50 ?,Sw of Phen and Py have also been gradually increases.With system pH increased from 5 to 10,Sw of Phen and Py first increased then decreased,the largest in the p H = 9,Phen(33.83mg/l)and Py(30.68mg/l).(3)Investigate the elution effect of Phen and Py: When Ctotal=4000mg/l,With the increase of ?,the elution of Phen and Py first increased then decreased,the largest in the ?= 0.4,Phen(72.4%)and Py(61.05%).When ?=0.4,With system Ctotal increased,the elution of Phen and Py increased.When ?=0.4,C?=4000mg/l,With system pH increased from 5 to 10,the elution of Phen and Py first increased then decreased,the largest in the pH= 9,Phen(72.78%%)and Py(61.05%).With system temperature,solid-liquid ratio,ultrasonic time increased,the elution of Phen and Py increased,Ultrasound can significantly improve the distribution system of polycyclic aromatic hydrocarbons,the elution efficiency of ultrasonic time is 3h,close to completely clear.