Treatment of petroleum hydrocarbon contaminated soil by basic oxygen furnace slag activated persulfate oxidation in presence of electromagnetic induction heating

This work introduced a novel methodology for remediation of petroleum hydrocarbons (PHs) contaminated soil via basic oxygen furnace slag (BOFs) and persulfate in presence of electromagnetic induction heating. Results showed larger particle size of BOFs leaded to increase TPH removal rate when heated by electromagnetic induction. Higher TPH removal rate yielded when fine particle size of BOFs used for activation of persulfate due to Fe2+ easily released and reacted with persulfate for generation of more sulfate radical (SO4 center dot-). Increasing the dosage of BOFs, the removal rate firstly increased then decreased due to high pH value for consumption of SO4 center dot-. TPH removal rate increased as increasing dosage of persulfate and solution to soil ratio and decreases. Lower pH and initial TPH concentration resulted in higher removal rate, while prolonging reaction time and increasing temperature facilitated to increase TPH removal rate. In thermal/oxidation group, more SO4 center dot- was generated when BOFs reacted with persulfate under electromagnetic induction. Electromagnetic induction enhanced TPH removal efficiency and made oxidation and degradation reaction fast. Besides, after addition of BOFs, soil properties such as chemical and mineral composition, mechanical characteristics were improved.

Automated summary

The study introduced a novel methodology for remediating petroleum hydrocarbons contaminated soil using basic oxygen furnace slag and persulfate in the presence of electromagnetic induction heating. Results showed that particle size and dosage of BOFs had significant effects on TPH removal rate, with electromagnetic induction heating enhancing efficiency.