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Séminaires Délégation Sultanat d’Oman - Mercredi 19 juin 2019 à 14h

par Christelle FLOUTIER -

 
L’IEM recevra une délégation du Sultanat d’Oman (Department of Engineering, College of Sciences, Sohar) le 19 juin 2019.
Trois séminaires sont programmés à partir de 14h30 :
 

Dr. Mohamed Salah
Department of Engineering, College of applied sciences, Suhar, North Al Batinah, Oman
Email : mohammedsalah.soh@cas.edu.om
 

"Wastewater treatment by electrocoagulation in the presence of electromagnetic field"

The EC process is recognized as fast, instantaneous and in-situ process for the removal of pollutants. It has the merits of a compact unit size, simple operation, and low fixed and running costs. The main objective of this presentation is to illustrate the effect of incorporating electromagnetic field during wastewater treatment by electrocoagulation technique. First, we studied the removal of Methylene blue dye by using an electromagnetic field during the electrocoagulation process. The formed ferric hydroxide flocs trap colloidal particles and make solid–liquid separation easier during the next stage. The utilization of an electromagnetic field enhanced the dye removal due to the induced motion of paramagnetic ions in the solution. The power consumption required to remove the dye was reduced by 45% in the case of applying an electromagnetic field. Then, we compared the hydrodynamic and magneto hydrodynamic behavior during the electrocoagulation of oil water emulsion. Results indicated that the hydrodynamic effect enhanced the removal rate of oil to some extent, and considerably reduced the energy consumption per each kg of oil removed. Moreover, experiments also indicated that the application of electromagnetic field enhanced the oil separation in a relatively same manner. During the same time interval, the EMF enhances the oil removal percentage to be 94.8% compared to 72.4% without it. Accordingly, the application of the electromagnetic field in a continuous process would enhance the oil separation at relatively same power consumption
Keywords : electrococagulation, electromagnetic field, hydrodynamics, magneto hydrodynamics

 

Dr. Ilyes Jedidi
Department of Engineering, College of applied sciences, Suhar, North Al Batinah, Oman
Email : ilyesjedidi.soh@cas.edu.om
 

"Development of Carbon membranes and carbon/CNT membranes for wastewater treatment"

Carbon membranes are known for their excellent behavior in gas separation but also in liquid separation especially for water-oil emulsions (due to their hydrophobic character) and in corrosive solutions purification such as industrial acids purification such as Phosphoric acid due to their excellent chemical inertia. Carbon membranes are mostly prepared by carbonizing at a temperature varying from 600°C to 900°C under inert atmosphere a shaped green body made of an organic precursor. The result is a porous carbon membrane where carbon is in vitreous state.
In a previous work, a process was developed to prepare carbon membranes consisted in a new and easy approach to prepare carbon MF and UF membranes. These membranes were prepared by extruding a green body or a paste made of a mixture of mineral coal or graphite powder, porogen compounds and a solution of phenolic resin/ethanol. A carbonization at 700℃ under inert atmosphere is needed to obtain the final porous structure. These membranes showed very promising results when applied to the treatment of wastewater by filtration and by electrofenton-baromembranar filtration coupled process.
Adding a carbon nanotubes growth catalyzing agent to the steps of preparation of these carbon membranes allowed us to grow CNT’s and iron nanoparticles inside the porosity of the material. The CNT’s grew also on the external surface of the material which resulted in a MF and UF layers with vertically grown CNT’s on top of them (figue.1). Such structure is suspected to have very good results in fooling reduction and electrofenton (since the conductivity had a spectacular increase).
When tested as adsorbent on synthetic aqueous solutions of humic acid, we witnessed the spectacular effect that can have CNT’s to enhance significantly the adsorption capacity of the material .
Using diluted solution of Phenolic resin/Ethanol, we were able to deposit, by slip casting, a thin nanofiltration layer and tailor its average pore size within 1 to 2 nm by varying the thermal treatment conditions. The layer had a thickness less than 1 nanometer and the carbon structure of the layer was graphene-like according to the TEM analysis.

 
 
Dr. Mohamed Al-Saidi
Department of Engineering, College of applied sciences, Suhar, North Al Batinah, Oman

“Research Potential and opportunities in Oman”

Agenda

  • Mercredi 19 juin 14:30-17:00 -

    Séminaires Délégation ultanat d’Oman - Mercredi 19 juin 2019 à 14h

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