In the present study, Anodic oxidation (AO) as an Advanced Oxidation Process (AOP), was applied to degrade and mineralize a synthetic solution of a textile dye, Bromothymol Blue (BTB) on a Boron Doped Diamond (BDD) anode. An industrial discharge, sampled from a Tunisian textile industry containing BTB, was then treated, at the same operating conditions by AO. The effect of key parameters such as current density, reaction medium pH, treatment time, bubbling and cathode nature was investigated for the synthetic BTB solution. Discoloration yield was optimal and it reached 99% after 60 min of BTB treatment at pH 3, using a carbon felt as a cathode, operating at 60 mA cm-2 as current density and maintaining bubbling during the electrolysis. BTB mineralization was investigated under these optimal conditions by monitoring the discoloration, the Chemical Oxygen Demand (COD) and the Total Organic Carbon TOC) during 360 min of treatment, recording 100% of discoloration, 67% of COD abatement and 59% of TOC abatement. Thereupon the optimization of BTB synthetic dye solution, AO method was applied to oxidize an industrial textile effluent. Results found after 360 min of treatment at the same optimal conditions showed almost 94% of discoloration, 59% and 52% of COD and TOC removal respectively. The energy consumption per unit COD mass (ECCOD) of the AO was also calculated for the treatment of both BTB synthetic solution and the Tunisian textile effluent. 0.7 kWh (g COD)-1 and 0.91 kWh (g COD)-1 were found respectively after 360 min of treatment.
M. Maamar, N. Bellakhal
Bromothymol Blue, Advanced Oxidation Process, Anodic Oxidation, Boren Doped Diamond anode, Textile Effluent