Combination of Electrocoagulation and Photocatalysis Process for Dye Removal from Textile Effluent
Supamas Danwittayakul* and Phutthamon Chantes* Author for corresponding; e-mail address: supamasd@mtec.or.th
Volume: Vol.48 No.2 (March 2021)
Research Article
DOI:
Received: 22 June 2020, Revised: -, Accepted: 20 August 2020, Published: -
Citation: Danwittayakul S. and Chantes P., Combination of Electrocoagulation and Photocatalysis Process for Dye Removal from Textile Effluent, Chiang Mai Journal of Science, 2021; 48(2): 533-544.
Abstract
Electrocoagulation, photocatalysis and the combination of both methods were carried out to compare dye removal efficiency from an aggressive high chemical oxygen demand (COD) dyeing wastewater. The as-received effluent was 195 mg/L reactive dye and 60 mg/L sodium silicate having 2457 mg/L of COD. For the individual electrocoagulation, the optimum condition was found upon using mixed Fe/Al:cathode/anode electrode materials, 12 V of electrical voltage and electrode gap of 1 cm, which yielded about 68% dye removal and the 71% COD reduction. In the TiO2 photocatalytic experiments, 0.05% was the best concentration exhibiting about 35% dye removal with the COD reduction of 38% under UVC irradiation for 2 hours. The similar result of 36% dye removal was obtained when using ZnO powders, while ZnO/ZTO (zinc oxide composited with zinc tin oxide) supported ceramic exhibited above 48% dye removal. To further enhance the removal efficiency, the integrated process of 1 hour electrocoagulation consecutively connected with additional 2 hours photocatalysis using ZnO/ZTO supported catalyst showed the highest treatment efficiency of 90% dye removal with 96% COD reduction. In contrast, the simultaneous electrocoagulation with photocatalysis using ZnO/ZTO supported catalyst exhibited 68% dye removal with only 77% COD reduction.
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