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Samet et al. [18] used BDD as the anode for chlorpyrifos degrada- tion, and reported that chlorpyrifos could be completely degraded after 6 h of operation [9]. In addition to aforementioned researches, the electrocatalytic technology has also been used for the treat- ment of other pollutants which are more toxic and difficult to han- dle [10–13]. In addition to the above broad applications, there are several advantages of the electrocatalytic technology, such as sim- ple equipment, easy operation, high removal efficiency, and little sludge generation [14,15].Among many kinds of electrocatalytic materials, titanium diox- ide (TiO2) is relatively cheap and popular compared to the BDD. Our research team has applied TiO2 electrode to treat two types of wastewater. One was methyl orange wastewater, which was treated with a nano-TiO2 electrode fabricated by chemical vapor deposition, where the chroma and TOC removal efficiencies reached 97% and 56% after 160-min treatment, respectively [13]. The other was municipal wastewater treatment, where the COD re- moval efficiency could be as high as 90% after 60-min treatment. The wastewater pH was slightly increased and then stabilized, and the DO concentration was greatly enhanced [4]. According to our previous results, TiO2 was selected as one kind of electrode material in this study. However, during the electrocatalytic treat- ment process, the anode material may be depleted due to the long-term usage and the complicated properties of wastewater (such as extreme pH and corrosive conditions). Hence, in this study the DSA (containing iridium dioxide, IrO2) with acid/alkaline resis- tance, corrosion resistance, and high chemical stability was se- lected as another catalytic electrode as well [18,19].This work was to investigate the TOC and chroma removal effi- ciencies of real printing wastewater treated by various kinds of cat- alytic electrodes such as TiO2, DSA and graphite. In contrast to other researches that used only synthetic wastewater, the experi- mental results obtained from the real printing wastewater treat- ment can provide practical information to environmental engineers. In addition, this work also discussed the production rate of hydroxyl radicals on the above different catalytic electrodes, which helped to clarify the degradation mechanism
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