| Rapid degradation of point-source pollution in soil caused by toxic and organic chemicals has become a hot issue in the field of environmental protection.In this paper,Pentachlorophenol(PCP) was to be the target pollutant,using prying soil treatment reactor,PCP contaminated soil was disposed by Fenton reagent and K2S2O8 oxidant,factors that influenced PCP degradation were studied and the optimal condition was obtained.Fenton reagent was adopted to dispose of the contaminated soil,the results showed that,PCP degradation rate first increased and then decreased as the H2O2 and Fe2+ molar ratio changed from 30:1 to 100:1,and 80:1 was the best.Increasing H2O2 mass fraction and improving rotating speed of the reactor can promote PCP degradation.When H2O2 mass fraction was 30%and the rotating speed at 30r/min, the PCP highest degradation rate was up to 83.0%after 60 minites reaction,while the oxidation efficiency of PCP was 3.07g PCP/molH2O2,the reaction solution could be reused,however,the degradation efficiency of PCP decreased after reuse 2 times.At the basis of the above,the optimal process was designed.The results of PCP contaminated soil treatment with K2S2O8 oxidant showed that,PCP degradation rate first increased and then decreased as the temperature changed from 25℃to 70℃,and 60℃was the best,improving rotating speed of the reactor can promote PCP degradation.At neutral conditions,as the rotating speed was at 30r/min,the PCP highest degradation rate was up to 83.2%,while the oxidation efficiency of PCP was 20.5g PCP/molK2S2O8.The rate of degradation of PCP was increased 19.1%after adding Ag+.The degradation efficiency of PCP decreased after reuse.At the basis of the above,the optimal process was designed. In the treatment of PCP contaminated soil,Fenton reagent required to adjust pH value,and the reaction was strong;K2S2O8 oxidation reaction was mild without pH adjustment,and it possessed the advantages of strong processing ability and good degradation effects.
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