Comparative study of the treatment of printing ink wastewater by conductive-diamond electrochemical oxidation, Fenton process, and ozonation

*Corresponding author Email: [email protected] In this work, the treatment of organics present in printing ink wastewaters such as dyes (methylene blue and rhodamine B), surfactants (sodium dodecylbenzene sulfonate), and solvents (ethylene glycol), as well as actual printing ink wastewaters by advanced oxidation processes, namely conductive diamond electrochemical oxidation (CDEO), Fenton process and ozonation, has been investigated. To compare the efficiency of CDEO, Fenton process and ozonation in the removal of chemical oxygen demand (COD) and total organic carbon (TOC), oxygen-equivalent chemicaloxidation capacity (OCC) has been used to quantify the amount of oxidant utilized in each oxidation process for comparison purpose. Results have shown that CDEO technology has achieved high COD removal of > 95% and TOC of > 90%, however ozonation and Fenton process have been able only -3 to achieve COD and TOC removals of 65-80%. CDEO process was found to utilize 12.9 kg O m as 2