[Advanced electrochemical oxidation process for treatment of biorefractory wastewater containing typical aromatic compounds].

Biorefractory wastewater containing one kind of typical aromatic compounds, i.e., aniline, chlorobenzene, p-chlorophenol and p-nitrophenol, was investigated by Advanced Electrochemical Oxidation Process (AEOPs) on a novel beta-PbO2 anode modified by fluorine resin. Under current of 0.25A, the removal rate for organic compounds and COD of the wastewater in 2 hours was around 75%-100%, and 22%-55%, respectively, following by the sequence of aniline, chlorobenzene, p-chlorophenol and p-nitrophenol. Higher current and initial organic compound concentration could enhance the wastewater treatment efficiencies. Benzoquinone, fumaric acid and oxalic acid were detected as the common degradation intermediates by HPLC, based on which a general degradation pathway of these aromatic compounds was further proposed.