[Chemical oxidants for remediation of soils contaminated with polycyclic aromatic hydrocarbons at a coking site].

Different oxidants were evaluated for removal of polycyclic aromatic hydrocarbons (PAHs) from contaminated soils at industrial coking sites with the use of simulating device, and the fate of pollutants during the treatment was investigated. Permanganate showed the highest PAHs removal rate (96.2%) of the oxidants studied. Most of the PAHs were oxidized and only < 1% of PAHs volatilized and transferred to the solvent. The removal of PAHs by activated persulfate reached 92%. Modified Fenton reagent could remove 80% of PAHs, and < 2% of PAHs volatilized and transferred to the solvent after treatment with activated persulfate and modified Fenton reagent. The efficiencies of hydrogen dioxide and Fenton reagent for removal of PAHs were both < 60% ,and up to 6% of PAHs volatilized and transferred to the solvent. In summary, permanganate and activated persulfate are the most effective and environment-friendly oxidants for removing PAHs from contaminated soils. The chemical oxidants could easily remove ANY, ANT, BaP, DahA, BghiP and IcdP, but FLE, CHR and Fla were relatively resistant to chemical oxidation.