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Energy-saving removal of methyl orange in high salinity wastewater by electrochemical oxidation via a novel Ti/SnO2-Sb anode—Air diffusion cathode system

Paper ID Volume ID Publish Year Pages File Format Full-Text
53898 46988 2015 6 PDF Available
Title
Energy-saving removal of methyl orange in high salinity wastewater by electrochemical oxidation via a novel Ti/SnO2-Sb anode—Air diffusion cathode system
Abstract

•TSSA-ADC system was built for high salinity organic wastewater treatment.•Active chlorine and H2O2 contributed to MO removal in the TSSA-ADC system.•High efficiency and energy saving were found from the TSSA-ADC system.•TSSA-ADC system could prevent scaling when treating wastewater with hardness ions.•TSSA-ADC system possesses great potentials for organics removal with chlorine ion.

Electrochemical oxidation is an effective method in removal of organic pollutant from high salinity wastewater (NaCl), by producing active chlorine at anode or hydrogen peroxide at cathode. To solve the existing problems including low efficiency, high cost and energy consumption, a Ti/SnO2-Sb anode (TSSA)-air diffusion cathode (TSSA-ADC) system was investigated for methyl orange (MO) removal from NaCl solution, using single TSSA system as control. The phase composition of TSSA was examined by X-ray diffraction. Accumulated concentrations of active chlorine, hydrogen peroxide, MO removal rate, TOC, pH value were recorded at different current densities. The results indicated that Sb-doped rutile SnO2 was formed on the TSSA. The TSSA and the ADC exhibited good catalysis to chlorine evolution and oxygen reduction, respectively. Although MO were almost completely removed in both systems, higher TOC removal, shorter running time and lower energy consumption were attained in the TSSA-ADC system. pH value was more stable (6.0–6.4) in the TSSA-ADC system than that in the TSSA system (6.0–9.4), predicting its stronger capacity in anti-scaling when treating high salinity wastewater with hard ions like Ca2+ and Mg2+.

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Keywords
Electrochemical oxidation; High salinity organic wastewater; Ti/SnO2-Sb anode; Air diffusion cathode; Energy saving
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Energy-saving removal of methyl orange in high salinity wastewater by electrochemical oxidation via a novel Ti/SnO2-Sb anode—Air diffusion cathode system
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 258, Part 1, 1 December 2015, Pages 156–161
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us