COD Removal from Electroplating Degreasing Wastewater by UV/H2O2 Process

Degreasing wastewater is a common type of wastewater produced from surface degreasing process in the electroplating industry. It has the characteristics of high pH, high oil content, and high COD value. This paper studies COD reduction of degreasing wastewater by UV/H2O2 oxidation process, and factors that affect COD removal rate. Those include H2O2 dosage, feeding method, and pH value. The optimized reaction condition was found to be pH of 3, the molar ratio of H2O2 to COD at 1:1 with continuous feeding of H2O2. A maximum COD removal rate of 91% can be achieved after 4 h of reaction.