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Chiang Mai Journal of Science, Faculty of Science, Chiang Mai University
 


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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 
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Keyword 
wastewater treatment, electrocoagulation, photocatalysis, TiO2, ZnO, ZnO/ZTO
Volume 
Vol.48 No.2 (March 2021)
DOI 
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.
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