Removal of Real Textile Dyes by Electrocoagulation/Electroflotation in a Pilot External-Loop Airlift Reactor


This paper studied the efficiency of electrocoagulation/electroflotation in removing colour from real textile wastewater by using aluminum and iron electrodes in an innovative pilot external-loop airlift reactor of 150 L. The reactor was designed to operate in batch and continuous modes. The real effluent contained 90% of disperse dye and 10% of reactive dye. A complete flotation of pollutants with acceptable mixing was achieved in this reactor using only the overall liquid recirculation induced by H2 microbubbles. The treatment of these discharges was easier using electrodes of iron rather than aluminum. The optimal initial pH was 10 for both aluminum and iron electrodes. By using iron electrodes, the maximum decolourisation efficiency and COD reduction efficiency reached respectively 96% and 65% for 90 minutes of treatment. Similarly, by using aluminum electrodes, the maximum decolourisation efficiency reached 90%, COD reduction reached 51% for 120 minutes of treatment. In the case of an initial pH slightly different to 10, the required time to reach 90% ranged from double to triple.

Share and Cite:

H. Chenik, M. Elhafdi, A. Dassaa, A. Essadki and M. Azzi, "Removal of Real Textile Dyes by Electrocoagulation/Electroflotation in a Pilot External-Loop Airlift Reactor," Journal of Water Resource and Protection, Vol. 5 No. 10, 2013, pp. 1000-1006. doi: 10.4236/jwarp.2013.510104.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] R. W. Peters, T. J. Walker, J. E. Eriksen, T. K. Cheng, Y. Ku and W. M. Lee, “Wastewater Treatment—Physical and Chemical Methods,” Journal of the Water Pollution Control Federation, Vol. 57, 1985, pp. 503-517.
[2] J. S. Do and M. L. Chen, “Decolorization of Dye Containing Solutions by Electrocoagulation,” Journal of Applied Electrochemistry, Vol. 24, No. 8, 1994, pp. 785-790.
[3] J. Q. Jiang and J. D. Graham, “Enhanced Coagulation Using Al/Fe(III) Coagulants: Effect of Coagulant Chemistry on the Removal of Color-Causing NOM,” Environmental Technology, Vol. 17, 1996, pp. 937-950.
[4] Y. M. Slokar and A. M. Le Marechal, “Methods of Decoloration of Textile Wastewaters,” Dyes Pigments, Vol. 37, No. 4, 1998, pp. 335-356.
[5] A. J. Greaves, D. A. S. Phillips and J. A. Taylor, “Correlation between the Bio Elimination of Anionic Dyes by an Activated Sewage Sludge with Molecular Structure. Part 1: Literature Review,” JSDC, Vol. 115, 1999, pp. 363-365.
[6] M. Bayramoglu, M. Eyvaz and M. Kobya, “Treatment of the Textile Wastewater by Electrocoagulation: Economical Evaluation,” Chemical Engineering Journal, Vol. 128, No. 2-3, 2007, pp. 155-161.
[7] M. Y. A. Mollah, R. Morkovsky, J. A. G. Gomes, M. Kesmez, J. R. Parga and D. L. Cocke, “Fundamentals, Present and Future Perspectives of Electrocoagulation,” Journal of Hazardous Materials, Vol. 114, No. 1-3, 2004, pp. 199-210.
[8] A. H. Essadki, M. Bennajah, B. Gourich, C. Vial, M. Azzi and H. Delmas, “Electrocoagulation/Electroflotation in an External-Loop Airlift Reactor—Application to the Decolorization of Textile Dye Wastewater: A Case Study,” Chemical Engineering and Processing, Vol. 47, No. 8, 2008, pp. 1211-1223.
[9] A. H. Essadki, B. Gourich., C. Vial, H. Delmas and M. Bennajah, “Defluoridation of Drinking Water by Electrocoagulation/Electroflotation in a Stirred Tank Reactor with a Comparative Performance to an External-Loop Airlift Reactor,” Journal of Hazardous Materials, Vol. 168, No. 2-3, 2009, pp. 1325-1333.
[10] W, Balla, A. H. Essadki, B. Gouricha, A. Dassaa, H. Chenik and M. Azzi, “Electrocoagulation/Electroflotation of Reactive, Disperse and Mixture Dyes in an External-Loop Airlift Reactor,” Journal of Hazardous Materials, Vol. 184, No. 1-3, 2010, pp. 710-716.
[11] A. H. Essadki, B. Gourich, C. Vial and H. Delmas, “Residence Time Distribution Measurements in an External-Loop Airlift Reactor: Study of the Hydrodynamics of the Liquid Circulation Induced by the Hydrogen Bubbles,” Chemical Engineering Science, Vol. 66, No. 14, 2011, pp. 3125-3132.
[12] G. Chen, “Electrochemical Technologies Inwastewater Treatment,” Separation and Purification Technology, Vol. 38, No. 1, 2004, pp. 11-41.
[13] V. A. Glembotskii, A. A. Mamakov, A. M. Ramanov and V. E. Nenno, Proceedings of the 11th International Mineral Processing Congress, Cagliari, 20-26 April 1975, pp. 562-581.
[14] N. Adhoum, L. Monser, N. Belkhal and J.-E. Belgaied, “Treatment of Electroplating Wastewater Containing Cu2+, Zn2+ and Cr(VI) by Electrocoagulation,” Journal of Hazardous Materials, Vol. 112, No. 3, 2004, pp. 207-213.
[15] Meenakshi and R. C. Maheshwari, “Fluoride in Drinking Water and Its Removal,” Journal of Hazardous Materials, Vol. 137, No. 1, 2006, pp. 456-463.

Copyright © 2023 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.