Chiang Mai Journal of Science

Combination of Electrocoagulation and Photocatalysis Process for Dye Removal from Textile Effluent

Paper Type	Contributed Paper
Title	Combination of Electrocoagulation and Photocatalysis Process for Dye Removal from Textile Effluent
Author	Supamas Danwittayakul* and Phutthamon Chantes
Email	supamasd@mtec.or.th
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.
Start & End Page	533 - 544
Received Date	2020-06-22
Revised Date
Accepted Date	2020-08-20
Full Text	Download
Keyword	wastewater treatment, electrocoagulation, photocatalysis, TiO2, ZnO, ZnO/ZTO
Volume	Vol.48 No.2 (March 2021)
DOI
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