Electrochemical oxidation of a textile dye wastewater using a Pt/Ti electrode

摘要

Textile dye wastewater (TDW) from a reactive azo dyeing process was treated by an electrochemical oxidation method using Ti/Pt as anode and stainless steel 304 as cathode. Due to the strong oxidizing potential of the chemicals produced (chlorine, oxygen, hydroxyl radicals and other oxidants) when the wastewater was passed through the electrolytic cell the organic pollutants were oxidized to carbon dioxide and water. A number of experiments were run in a batch, laboratory-scale, pilot-plant, and the results are reported here according to residence time and initial addition of HCl in raw wastewater. When of 2 ml of HCl 36/100 were added and after l8 min of electrolysis at 0.89 A/cm~2, chemical oxygen demand (COD) was reduced by 86/100, biochemical oxygen demand (BOD,) was reduced by 7l/100, ADMI color units were reduced by l00/100, and TKN was reduced by 35/100. The biodegradability of the wastewater was improved because the COD/BOD ratio decreased from 2.l6 to l.52. At the same time the efficiency of the electrode was about l70 g h~-l A~-l m~-2. and the mean energy consumption was 2l kW h/kg of COD. These results indicate that this electrolytic method could be used for effective TDW oxidation or as a feasible detoxification and color removal pretreatment stage for biological post treatment.