COMPARATIVE STUDY OF THE ELECTROOXIDATION OF GRAPHITE AND Ti/RUO2 ANODES FOR THE REMOVAL OF ORGANIC MATTER FROM SALINE WASTEWATER

Abstract

In recent years, clean water is increasingly scarce due to increased human demand, untreated wastewater is the cause of water quality deterioration. The aquaculture industry brings benefits in terms of food for humans, but the water sourses can be easily polluted by decomposition of redundant aqua feed and organic waste. In this study, saline wastewater is treated by electrochemical oxidation with two types of Graphite and Ti/RuO2 electrodes. Experiments were conducted to investigate the effect of reaction conditions such as salt concentration, current density, electrolysis time and pH on COD removal efficiency and electrode activity. Ti/RuO2 electrode showed better handling ability than graphite electrode at the same reaction condition. For the optimal efficiency of COD removal and anode activity, the electrolysis of saline wastewater is set at 2% salt content, at 45 mA/cm2 current density, in 60 minutes reaction , at 6 pH value.  In this condition, COD treatment efficiency reached 87.7% (anode graphite) and 92.9% (anode Ti/RuO2), electrode efficiency reached 0,208 kg/h.A.m2 (anode graphite) and 0,22 kg/h.A.m2 (anode Ti/RuO2).