Journal
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Volume 11, Issue 6, Pages 4878-4891Publisher
ESG
DOI: 10.20964/2016.06.2
Keywords
dyes; dimensional stable anodes (DSA); wastewater treatment; anodic oxidation; electrochemical advanced oxidation processes (EAOPs)
Categories
Funding
- National Council for Scientific and Technological Development [CNPq - 446846/2014-7, CNPq - 401519/2014-7]
- CNPq
- PNPD/CAPES
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In this work, a synthetic effluent containing methylene blue has been treated by electrochemical oxidation (EO) process at pre-pilot plant scale using a filter-press electrochemical cell reactor. Electrochemical experiments were carried out using Ti/Pt and Ti/IrO2-Ta2O5 anodic materials in the presence or absence of chloride ions to study the influence on the decolorization and mineralization of the different oxidant species electrogenerated in situ. The electrochemical experiences have been carried out at different applied current densities (j = 20, 40 and 60 mA cm(-2)) to evaluate the effect of this controlling parameter on the degradation efficiency and the operational energy consumption. Under optimal treatment conditions of 40 mA cm(-2) in 0.05 M of Na2SO4 at pH 6.0, solutions of 100 mg L-1 of methylene blue were completely decolorized obtaining 86.0 % of COD abatement after 360 min of electrolysis. The determination of energy consumption allowed to estimate operational costs about 13.36 US$ m(-3). The results obtained provide valuable information regarding the EO process scaling-up, aiming the application of electrochemical technologies to treat actual effluent at real scale.
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