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Removal of Color and Organic Matter in Industrial Phosphoric Acid by Ozone: Effect on Activated Carbon Treatment |
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| Authors: | H Belfadhel A Ratel A Ouederni R S Bes J C Mora |
| Affiliation: | 1. école Nationale d'Ingénieurs de Gabès, Department of Chemical Engineering, GGR , Route de Mednine, 6029 Gabès, TUNISIA;2. Laboratoire Matériaux et Energie, CEMES , Université Paul Sabatier , 118 rte de Narbonne, 31062 , Toulouse , FRANCE;3. INP Toulouse - ENSIGC, 18 Chemin de la Loge , FR-31078 Toulouse Cedex, FRANCE |
| Abstract: | Industrial phosphoric acid at 42-45% P2O5 and containing organic matter (OM) in the range of 220 mg/L to 300 mg/L is treated by combined ozonation and activated carbon. Ozonation alone removes the initial dark color of the acid and eliminates the organic content. Adsorption on activated carbon alone can reduce OM levels by 80% for more than 25 g/kg P2O5. We find that a preozonation noticeably enhances activated carbon efficiency and reduces its specific consumption. Isoconversion curves are plotted in specific ozone and activated carbon ratio space. |
| Keywords: | Ozone Organic Matter Phosphoric Acid Activated Carbon |