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    STUDIA CHEMIA - Issue no. 1-2 / 1999  
         
  Article:   REMOVAL OF SODIUM LINEAR ALKYLBENZENE SULPHONATE BY ELECTROCOAGULATION-ELECTROFLOTATION.

Authors:  G.A. CIORBA, C. RADOVAN, I. VLAICU, A. IOVI.
 
       
         
  Abstract:  This paper took into consideration the behaviour of an aluminium electrode in the presence and in the absence of sodium linear alkylbenzene sulphonate. It acted as the organic component of a simulated wastewater. In addition, the effect of the organic load (surfactant concentration) on the separation of the surfactant from water was studied. The characterisation of the electrode material was carried out by polarisation measurements under potentiostatic and galvanostatic conditions with scan rates of 0.02 V/s and 0.0001 A/s, respectively. The electrode processes could be stimulated or inhibited depending on the history of the electrode and the composition of the simulated wastewater. The change of the anodic inhibition or activation was interpreted by the character of the superficial oxide film and partially de-filming process. The simulated wastewater treatment was carried out in an electrocoagulation-electroflotation cell in galvanostatic conditions. The efficiencies of treatment ranged between 70-80% as Chemical Oxygen Demand (COD) removal. The increase of surfactant concentration over 0.75 g/L caused a sharp fall of the treatment efficiency.  
         
     
         
         
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