Electrocoagulation for the treatment of textile wastewaters with Al or Fe electrodes: compared variations of COD levels, turbidity and absorbance.
Electrocoagulation technique has been used for the treatment of two wastewaters issued by textile industry. Treatment was carried out in a discontinuous system provided with aluminium or iron electrodes, and with recirculation of the liquid. The efficiency of the technique was followed depending on the electrode material in terms of water treatment, current efficiency of the dissolution, cell voltage, energy consumption to reach the same COD or turbidity abatement: regardless of the quality of the phase separation in the flocculation section downstream of the electrocoagulation cell, the two metals were found to be of comparable efficiency. Besides COD and absorbance were shown to follow similar, regular variations along the treatment; experimental data could be interpreted by a simple model involving the overall equilibrium between the metal dissolved--in the form of hydroxides--and the polluting substance. Abatement of the waste turbidity was observed to obey another law, with a sharp reduction of turbidity after a preliminary phase, where accumulation of metal hydroxide has no effect on this variable.
Zongo
Inoussa
I
Laboratoire des Sciences du Génie Chimique, CNRS-Nancy Université, F-54001 Nancy, France.
Maiga
Amadou Hama
AH
Wéthé
Joseph
J
Valentin
Gérard
G
Leclerc
Jean-Pierre
JP
Paternotte
Gérard
G
Lapicque
Francois
F
D000535:Aluminum; D004564:Electrocoagulation / Q000379:methods* / Q000592:standards; D004566:Electrodes / Q000592:standards; D005427:Flocculation; D006878:Hydroxides; D007220:Industrial Waste / Q000517:prevention & control; D007501:Iron; D013783:Textile Industry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D006878:Hydroxides; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D000535:Aluminum; D007501:Iron