Remediation of PAH-Contaminated Soil by Combining Surfactant Enhanced Soil Washing and Iron-Activated Persulfate Oxidation Process

Yanhua Qiu, Meilan Xu, Zongquan Sun and Helian Li
Additional contact information
Yanhua Qiu: School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
Meilan Xu: School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
Zongquan Sun: School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China
Helian Li: School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China

IJERPH, 2019, vol. 16, issue 3, 1-10

Abstract: 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 2+ , nanoscale zero-valent iron (nZVI), and SiO 2 -coated nZVI (SiO 2 /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 SiO 2 /nZVI were not significantly different from those of PS activated with nZVI and Fe 2+ ( p > 0.05). In practice, SiO 2 /nZVI is more preferable due to the improved antioxidation and dispersibility. At the dosage of 2 g/L (in the amount of iron) of SiO 2 /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 SiO 2 /nZVI is a promising method for the treatment of soil washing effluents containing SDS and PAHs.

Keywords: soil remediation; PAHs; SDS; SiO2/nZVI; activated persulfate (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1660-4601/16/3/441/pdf (application/pdf)
https://www.mdpi.com/1660-4601/16/3/441/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:16:y:2019:i:3:p:441-:d:203184

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().