Abstract
In this study, degradation of ethylene diamine tetraacetic acid (EDTA) solution by the UV/Cu(II)/H2O2 process under various conditions was evaluated via chemical oxygen demand (COD) removal. The reactions were performed in a lab-scale batch photoreactor. The effects of different parameters such as H2O2 dosage, copper catalyst dosage, initial pH, and initial EDTA concentration on the oxidation efficiency of the process were investigated. The results indicated that the UV/Cu(II)/H2O2 process could effectively remove COD in both synthesized EDTA wastewater and real copper-plating wastewater. According to the experimental results, a reasonable mechanism was proposed to interpret the oxidation process. When treating real copper-plating wastewater (COD = 3,660 mg/L) catalyzed by self-contained 1.4 g/L copper, 98.6% of COD removal was obtained using 0.6 M H2O2 in 180 min. In addition to the removal of organic matter, copper complexes were decomposed to form easily removed free copper ions. This study shows that UV/Cu(II)/H2O2 is not only a powerful treatment method for COD removal of EDTA wastewater, but also an environmental friendly treatment process for copper-containing organic wastewater.
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