A hybrid process of electrochemical oxidation assisted by slow-release persulfate candle was investigated to treat polycyclic aromatic hydrocarbons (PAHs) in groundwater. All experimental data of dibenzofuran (DBF), 2-methylnaphthalene (2-MNA) and acenaphthene (ANA) oxidation followed the first-order kinetic model. The performance of carbon sheet electrodes for PAHs electrochemical oxidation increased with Cl- (11.27-38.03 mM) and SO42- (4.17-14.06 mM) concentrations and current density (0.2-0.9 Amphere/L). Furthermore, the oxidation efficiency was improved by combining the electrochemical oxidation and slow-release persulfate candle without the addition of Fe(II) metal activator, indicated by the higher oxidation rate constant (k, hr-1). The radical scavenger study using methyl tert-butyl ether (MTBE) and nitrobenzene (NB) showed that different mechanisms of radical formations are involved; sulfate radical dominant in the presence of Cl- and sulfate and hydroxyl radical dominant in the presence of SO42-. The formation of oxidation intermediate compounds was also investigated.

Slow-release persulfate candle assisted electrochemical oxidation of PAHs in groundwater

255th National Meeting (2018)

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