School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China.
Int J Environ Res Public Health. 2019 Feb 2;16(3):441. doi: 10.3390/ijerph16030441.
There is increasing concern regarding soils contaminated with polycyclic aromatic hydrocarbons (PAHs) In the present study, the remediation of soil spiked with PAHs was explored by the combination of soil washing with sodium dodecyl sulfate (SDS) and subsequent oxidation through persulfate (PS) activated by Fe, nanoscale zero-valent iron (nZVI), and SiO₂-coated nZVI (SiO₂/nZVI). Results demonstrated that the removal of phenanthrene (PHE), fluoranthene (FLU), and pyrene (PYR) by SDS is an efficient means for soil decontamination. At SDS concentration of 20 g/L, the removal efficiencies of PHE, PYR, and FLU were 37%, 40%, and 44%, respectively. For the degradation of PAHs and SDS in the soil washing effluents, the efficiencies of PS activated with SiO₂/nZVI were not significantly different from those of PS activated with nZVI and Fe ( > 0.05). In practice, SiO₂/nZVI is more preferable due to the improved antioxidation and dispersibility. At the dosage of 2 g/L (in the amount of iron) of SiO₂/nZVI, the removal efficiencies of PHE, FLU, PYR, and SDS within 30 min of treatment were 75%, 85%, 87%, and 34%, respectively. The degradation of SDS was much lower than those of PAHs, which facilitated the recycle of SDS. Our findings suggest that PS activated with SiO₂/nZVI is a promising method for the treatment of soil washing effluents containing SDS and PAHs.
目前的研究中，通过十二烷基硫酸钠（SDS）土壤洗涤与过硫酸盐（PS）氧化相结合，探索了修复被多环芳烃（PAHs）污染的土壤。结果表明，SDS 对土壤中菲（PHE）、荧蒽（FLU）和芘（PYR）的去除是土壤脱污染的有效手段。在 SDS 浓度为 20g/L 时，PHE、PYR 和 FLU 的去除率分别为 37%、40%和 44%。对于土壤洗涤废水中 PAHs 和 SDS 的降解，SiO2/nZVI 活化过硫酸盐的效率与 nZVI 和 Fe 活化过硫酸盐的效率没有显著差异（>0.05）。在实际应用中，由于 SiO2/nZVI 的抗氧化性和分散性得到了提高，因此更优选 SiO2/nZVI。当 SiO2/nZVI 的用量为 2g/L（以铁计）时，处理 30min 内 PHE、FLU、PYR 和 SDS 的去除率分别为 75%、85%、87%和 34%。SDS 的降解率远低于 PAHs，这有利于 SDS 的回收利用。我们的研究结果表明，SiO2/nZVI 活化过硫酸盐是一种很有前途的处理含有 SDS 和 PAHs 的土壤洗涤废水的方法。
