Treatability assessment of polycyclic aromatic hydrocarbons contaminated marine sediments using permanganate, persulfate and Fenton oxidation processes.
Various chemical oxidation techniques, such as potassium permanganate (KMnO4), sodium persulfate (Na2S2O8), Fenton (H2O2/Fe(2+)), and the modified persulfate and Fenton reagents (activated by ferrous complexes), were carried out to treat marine sediments that were contaminated with polycyclic aromatic hydrocarbons (PAHs) and dredged from Kaohsiung Harbor in Taiwan. Experimental results revealed that KMnO4 was the most effective of the tested oxidants in PAH degradation. Owing to the high organic matter content in the sediment that reduced the efficiencies of Na2S2O8 and regular Fenton reactions, a large excess of oxidant was required. Nevertheless, KH2PO4, Na4P2O7 and four chelating agents (EDTA, sodium citrate, oxalic acid, and sodium oxalate) were utilized to stabilize Fe(II) in activating the Na2S2O8 and Fenton oxidations, while Fe(II)-citrate remarkably promoted the PAH degradation. Increasing the molecular weight and number of rings of PAH did not affect the overall removal efficiencies. The correlation between the effectiveness of the oxidation processes and the physicochemical properties of individual PAH was statistically analyzed. The data implied that the reactivity of PAH (electron affinity and ionization potential) affected its treatability more than did its hydrophobicity (Kow, Koc and Sw), particularly using experimental conditions under which PAHs could be effectively oxidized.
['Shih|Yu-Jen|YJ|', 'Binh|Nguyen Thanh|NT|', 'Chen|Chiu-Wen|CW|', 'Chen|Chih-Feng|CF|', 'Dong|Cheng-Di|CD|']
D019015:Geologic Sediments D006861:Hydrogen Peroxide D007501:Iron D017895:Manganese Compounds D016877:Oxidants D010084:Oxidation-Reduction D010087:Oxides D011084:Polycyclic Aromatic Hydrocarbons D011196:Potassium Permanganate D017670:Sodium Compounds D013431:Sulfates D013624:Taiwan
Marine sediment Chemical oxidation Physicochemical property Gas chromatography Statistical analysis