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

• Published in: Journal of Hazardous Materials
• Main Authors: Vlyssides, AG, Loizidou, M, Karlis, PK, Zorpas, AA, Papaioannou, D
• Format: Article in Journal/Newspaper
• Language: English
• Published: ELSEVIER SCIENCE BV 1999
• Subjects: Azo dye; Color removal; Electrolysis treatment; Textile; Ti/Pt electrode; Wastewater; Engineering; Environmental; Civil; Environmental Sciences; Biological post treatment; Detoxification; Electrochemical oxidation; Textile dye wastewater; Biodegradation; Chemical oxygen demand; Color removal (water treatment); Electrochemical electrodes; Electrolysis; Industrial wastes; Oxidation; Platinum; Textiles; Titanium; Wastewater treatment; Azo dyes; dye; electrochemical technique; textile industry application; article; electrode; reaction analysis; technique; textile industry; waste water management; Coloring Agents; Electrodes; Environmental Pollution; Humans; Oxidation-Reduction; Waste Disposal; Fluid; Gadus morhua; effluent treatment; water pollution
• Online Access: http://dspace.lib.ntua.gr/handle/123456789/13152; https://doi.org/10.1016/S0304-3894(99)00130-2

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% were added and after 18 min of electrolysis at 0.89 A/cm(2), chemical oxygen demand (COD) was reduced by 86%, biochemical oxygen demand (BOD,) was reduced by 71%, ADMI color units were reduced by 100%, and TKN was reduced by 35%. The biodegradability of the wastewater was improved because the COD/BOD ratio decreased from 2.16 to 1.52. At the same time the efficiency of the electrode was about 170 g h(-1) A(-1) m(-2). and the mean energy consumption was 21 kW h/kg of GOD. 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. (C) 1999 Elsevier Science B.V. All rights reserved.