Treatability assessment of polycyclic aromatic hydrocarbons contaminated marine sediments using permanganate, persulfate and Fenton oxidation processes. (May 2016)

• Record Type: Journal Article
• Authors: Shih, Yu-Jen; Binh, Nguyen Thanh; Chen, Chiu-Wen; Chen, Chih-Feng; Dong, Cheng-Di
• Is Part Of: Chemosphere. Volume 150(2016)
• Page Start: 294
• Page End: 303
• Publication Date: 2016-05
• Subjects: Chemical oxidation -- Physicochemical property -- Gas chromatography -- Statistical analysis -- Marine sediment; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2016.01.112
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Various chemical oxidation techniques, such as potassium permanganate (KMnO4 ), sodium persulfate (Na2 S2 O8 ), Fenton (H2 O2 /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 Na2 S2 O8 and regular Fenton reactions, a large excess of oxidant was required. Nevertheless, KH2 PO4, Na4 P2 O7 and four chelating agents (EDTA, sodium citrate, oxalic acid, and sodium oxalate) were utilized to stabilize Fe(II) in activating the Na2 S2 O8 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. Highlights: Treatability of PAH contaminated marine sediment was assessed by chemical oxidations. KMnO4 was better on PAH degradation than Na2 S2 O8 and Fenton chemicals. Citrate chelated Fe(II) efficiently catalyzed Na2 S2 O8 and Fenton oxidation of PAH. Correlation between degradability and physicochemical properties of PAH was evaluated. Removal of PAH was affected more by the reactivity than by the hydrophobicity.