Remediation of sulfathiazole contaminated soil by peroxymonosulfate: Performance, mechanism and phytotoxicity

Peroxymonosulfate (PMS) was successfully adopted to remove organic pollutants in water, but it was rarely applied to soil remediation. Sulfathiazole (STZ) is a widely used sulfonamide antibiotic, while its residues have negative impacts on soil. To the best of our knowledge, this is the first attempt to apply PMS for the treatment of STZ-contaminated soil. The results showed that 4 mM PMS can degrade 96.54% of STZ in the soil within 60 min. Quenching and probe experiments revealed that singlet oxygen rather than hydroxyl radical and sulfate radical was the predominant reactive oxygen species responsible for STZ removal. The presence of Cl-, SO42-, NO3-, Fe3+, and HA enhanced the degradation efficiency of STZ, while HCO3- and Mn2+ presented an obstructive effect on STZ elimination at high concentrations. Different chemical extraction procedures were used to determine the bioavailability of the heavy metals. PMS oxidation process caused an unnoticeable influence of the concentrations of heavy metals except for the increase of Mn concentration and the decrease of Ba concentration. Moreover, the germination rate and stem length of wheat and radish both increased, indicating PMS oxidation reduced the toxicity of STZ, and the increase of Mn concentration did not cause a negative impact on their growth. Besides, the results of XRD and FTIR tests showed oxidation processes have negligible impacts on soil structure and composition. Based on intermediates identified, STZ degradation pathways in the PMS system were proposed. According to the results of this study, using PMS alone to repair STZcontaminated soil is a relatively feasible, safe, and environmentally friendly technology.

Automated summary

This study aimed to explore the use of peroxymonosulfate (PMS) for the remediation of sulfathiazole (STZ)-contaminated soil. The results showed that 4 mM PMS could degrade 96.54% of STZ in the soil within 60 min. Singlet oxygen was identified as the main reactive oxygen species responsible for STZ removal. Certain ions and compounds enhanced the degradation efficiency of STZ, while others hindered its elimination. The oxidation process had minimal impact on soil structure and composition, and the germination rate and growth of wheat and radish increased. Based on the findings, using PMS alone for STZ-contaminated soil remediation is a feasible, safe, and environmentally friendly technology.