Remediation of Marine Sediments Contaminated with PAHs Using Sodium Persulfate Activated by Temperature and Nanoscale Zero Valent Iron

Chiu Wen Chen; Nguyen Thanh Binh; Yi Kuo Chang; Chang Mao Hung; Cheng Di Dong

doi:10.4028/www.scientific.net/AMR.1044-1045.380

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Remediation of Marine Sediments Contaminated with PAHs Using Sodium Persulfate Activated by Temperature and Nanoscale Zero Valent Iron

Abstract:

The oxidation of 16 polycyclic aromatic hydrocarbons compounds (PAHs) in sediments by sodium persulfate (Na₂S₂O₈) activated by temperature and nanoscale zero−valent iron (nZVI) as the source of catalytic ferrous iron was investigated. The effect of various controlling factors including S₂O₈²⁻ (0.017–170 g/L), nZVI (0.01–1 g/L), and temperature (50–70°C) were performed. The efficiency to remove PAHs was not too high as 10.7–39.1% for unactivated persulfate. Results from experiments indicate that increasing temperature or the addition of nZVI into a persulfate-slurry system could enhance the persulfate oxidation process. The best removal efficiency (86.3%) was attained after 24 hr while adding nZVI (0.5 g/L) to persulfate (170 g/L) at temperature of 25°C. The results of our study suggest that nZVI assisted persulfate oxidation without elevating temperature is a suitable and economic alternative for the ex–situ treatment of PAHs contaminated sediments.