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ZERO-VALENT IRON ACTIVATED PERSULFATE REMEDIATION OF POLYCYCLIC AROMATIC HYDROCARBON-CONTAMINATED SOILS: AN IN SITU PILOT-SCALE STUDY
Song, Y., G. Fang, C. Zhu, F. Zhu, S. Wu, N. Chen, T. Wu, Y. Wang, J. Gao, and D. Zhou.
Chemical Engineering Journal 355:65-75(2019)

Different types of zero-valent iron (ZVI)—micro/nanostructured ZVI (NZVI), stearic-coated micro/nanostructured ZVI (C-NZVI), and commercial micron-sized ZVI (MZVI)—were used to activate persulfate (PS) to remove PAHs from a contaminated site. Three reaction pits were excavated to test the activation ability of the different ZVI types, each with an area of ~30 m2 and a depth of 4 m. PS at 30 g/kg and ZVI at 3.5 g/kg were added in soil slurry by in situ stirring. After treatment for 104 d, PAHs (~17 mg/kg) removal efficiencies were 82.21%, 62.78%, and 69.14% for PS activated by NZVI, C-NZVI, and MZVI, respectively. Soil pH was observed to decrease owing to the release of H+ from PS decomposition. Soil bacterial community populations decreased markedly, particularly bacteria of the phylum Chloroflexi, which almost disappeared after remediation. Bacteria of the phylum Firmicutes, however, still dominated after remediation and exhibited a tolerance to PS.



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