Performances du système hybride précipitation / microfiltration et de la nanofitration dans l'élimination du fer pour la potabilisation de l'eau

Abstract : Water-related issues are a major challenge for our environment. Many processes of water treatment are available. In this work, we have developed an alternative to the current treatment of water, so as to propose a technology less expensive, easier to operate and less consuming chemicals.In this context, we have developed a hybrid process combining a microfiltration membrane process with the oxidation / precipitation of iron for the treatment of water with high iron contents provided by the SONEDE (National Society of Water Exploitation and Distribution Of Sfax, Tunisia).The study concerns the precipitation of iron by bubbling air in a reactor coupled with microfiltration using several membranes (commercial (Kerasep) or prepared at the Laboratory of Materials and Environment Sciences (Sfax) based on clay , Alumina and activated carbon Two types of water have been studied: a synthetic water prepared in the laboratory with a certain concentration of dissolved iron and a real water rich in iron coming from a drilling of the region of Sfax. Parameters were studied: initial iron concentration, pH and transmembrane pressure The process was also evaluated for the treatment of drilling water in the Sfax region. To better understand the hybrid aeration / MF process, results obtained with different membranes in frontal filtration are presented.In order to intensify the processes, another deferrisation technique is studied by considering a single membrane treatment of nanofiltration by applying an organic spiral membrane of type NF 2125A (Applied Membranes ®, USA).The results obtained are promising in terms of filtration flux, iron retention and permeate quality and conform with WHO recommendations. From an efficiency point of view, the hybrid aeration / MF process gives a permeate flow more important than that of the NF. In conclusion, these two processes can prove to be advantageous alternatives to a conventional aeration process followed by sand filtration
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Rahma Fakhfekh Hamdeni. Performances du système hybride précipitation / microfiltration et de la nanofitration dans l'élimination du fer pour la potabilisation de l'eau. Matériaux. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSE1100⟩. ⟨tel-01810978⟩

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