Synthesis process and hydrodynamic behavior of a new filtration material for passive wastewater dephosphatation |
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| Affiliation: | 1. Université de Lorraine, Laboratoire de Chimie Physique et Microbiologie pour l''Environnement (LCPME), UMR 7564, 405 rue de Vand?uvre, F-54600 Villers-lès-Nancy, France;2. CNRS, Laboratoire de Chimie Physique et Microbiologie pour l''Environnement (LCPME), UMR 7564, 405 rue de Vand?uvre, F-54600 Villers-lès-Nancy, France;3. Ecole Nationale Supérieure de Chimie de Rennes, UMR CNRS 6226, 11 Allée de Beaulieu, CS 50837, F-35708 Rennes cedex 7, France;4. Université Européenne de Bretagne, 4 Boulevard Laennec, F-35700 Rennes, France;1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, PR China;2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, PR China;1. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, PR China;2. School of Material Science and Engineering, Central South University, Changsha 410083, PR China;1. School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, China;2. Sichuan Engineering Technical College, Deyang 618000, China;1. Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary;2. Laboratory of High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf CH-8600, Switzerland;3. Laboratory of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne, Ecublens CH-1026, Switzerland |
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| Abstract: | The preparation optimization of a filter material intended to be used as a phosphate sorbent in flow-through conditions is investigated. The mixing of ferrihydrite (Fh) and pozzolana (Pz) using a “dry contact method” is found to be the most efficient and leads to the formation of a micrometric thick Fh coating deposited into the honeycombed structure of Pz. The maximal Fh content of ~ 8.5 wt.% is significantly higher than the quantity deposited on other classical substrates such as sand. The phosphate sorption kinetics and isotherms, under dynamic conditions in batch experiments, are best described by pseudo-second-order and Freundlich models respectively. Moreover, under static conditions, sorption kinetics reveals intra-aggregate diffusion process. Phosphate ion retention in packed columns, and especially the breakthrough point, can be adequately predicted when coupling the classical convection dispersion equation and the surface complexation model. Breakthrough curves of phosphate ions are strongly dependent on flow rate; which is important for future industrial applications. Finally, and unexpectedly, a high value of phosphate adsorption capacity (80 mg PO4 g? 1) is observed when phosphate-containing wastewater is used as feed solution. This is mostly explained by soluble calcium ions, which favors the phosphate fixation onto the filter material surface. |
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