Novel technique to regenerate activated alumina bed saturated by fluoride ions |
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| Affiliation: | 1. Laboratoire des Biotechnologies, Ecole Nationale Polytechnique, 10 Avenue Pasteur, ELHarrach, Alger, Algeria;2. Facultés des Sciences, Université Ibn Tofail, B.P. 133, Kénitra, Morocco;3. IUT de Rennes, Département de chimie, rue Clos Courtel, 3500 Rennes, France;1. School of Chemical & Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland;2. School of Chemistry and CRANN, Trinity College Dublin, Dublin 2, Ireland;3. St. Petersburg National Research University of Information Technologies, Mechanics and Optics, 197101 St. Petersburg, Russia;1. Department of Chemistry, Goa University, Taleigao Plateau, Goa 403206, India;2. Organic Chemistry Department, RUDN University, 6 Miklukcho-Maklaya Str., Moscow 117198, Russian Federation;1. Centre de Recherches Pétrographiques et Géochimiques, UMR7358, CNRS, Université de Lorraine, BP 20, 54501 Vandoeuvre-lès-Nancy, France;2. GeoRessources, UMR 7359, CNRS, Université de Lorraine, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France;1. Department of Mechanical Engineering, Manipal University Jaipur, Jaipur, Rajasthan, India;2. Department of Automobile Engineering, Manipal University Jaipur, Jaipur, Rajasthan, India;3. Department of Mechanical Engineering, University Institute of Engineering and Technology, Maharshi Dayanand University, Rohtak, Haryana, India;4. Department of Mechatronics Engineering, Manipal University Jaipur, Jaipur, Rajasthan, India;1. Department of Mechanical Engineering, Bannari Amman Institute of Technology, Sathyamangalam 638401, India |
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| Abstract: | A novel technique to regenerate adsorbent column is presented. The process used is based on the utilization of an electrochemical cell which regenerates several saturated adsorbent bed. This paper presents the regeneration of the activated alumina (AA) bed saturated by fluoride ions. The results obtained in this study demonstrated that desorption of fluoride from activated alumina is a rapid process. Most of the fluoride content desorbed within 6–15 min. The utilization of the electrochemical cell allows a complete desorption of the fluoride under optimum conditions. The reduction of about 90% of the sodium hydroxide amount was attained by the electrochemical process. A study of adsorption–regeneration cycles showed that the electrochemical technique was more efficient than current techniques. A 95%, recovery of the adsorption capacity was realized with the electroregeneration system. In addition, the volume of water used to regenerate the saturated bed was lower than for current regeneration techniques. The washing did not exceed 6% of the treated water volume. The electrodesorption operation was successfully applied for fluoride desorption from saturated activated alumina column by natural water with strong mineralisation. |
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