On the crucial influence of some supporting electrolytes during electrocoagulation in the presence of aluminum electrodes

The influence of some supporting electrolytes on aluminum electrode oxidation and pH variation during electrocoagulation of an unskimmed milk sample and a cutting oil emulsion has been investigated. Among the electrolytes studied, sulfate anions were found to be quite harmful both for electrical con...

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Bibliographic Details
Published in:Journal of hazardous materials 2009-04, Vol.163 (2), p.1282-1288
Main Authors: Trompette, J.L., Vergnes, H.
Format: Article
Language:English
Subjects:
Aluminum
Aluminum electrodes
Animals
Applied sciences
Chemical engineering
Chemical Sciences
Chlorides
Electric power
Electrocoagulation
Electrocoagulation - methods
Electrodes
Electrolytes
Emulsions
Engineering Sciences
Exact sciences and technology
Hydrogen-Ion Concentration
Materials
Milk
Oxidation-Reduction
PH regulation
Pollution
Quaternary Ammonium Compounds
Reactors
Sodium
Sulfates
Supporting electrolyte
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Summary:The influence of some supporting electrolytes on aluminum electrode oxidation and pH variation during electrocoagulation of an unskimmed milk sample and a cutting oil emulsion has been investigated. Among the electrolytes studied, sulfate anions were found to be quite harmful both for electrical consumption and electrocoagulation efficiency. At the opposite, chloride and ammonium ions were particularly benefic respectively for aluminum corrosion and pH regulation, whereas sodium cations were observed to have a neutral role. The results indicate that electrocoagulation can be realized at low anodic potential even in the presence of sulfate ions when the [Cl −]/[SO 4 2−] ratio is around or greater than 1/10. The detrimental effect of sulfates on electrocoagulation efficiency can be thwarted by the use of the ammonium salt thanks to its related buffer effect.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2008.07.148