The electro-electrodialysis process (EED) is used to generate H 2 SO 4 and NaOH from sulphate sodium salt Na 2 SO 4. The key phenomenon limiting the current efficiency of this process is the proton leakage through the anion selective membrane was not observed. The electro-electrodialysis was carried out with a three-compartment cell with two platinum-coated titanium electrodes separated by three compartments. The couple membrane used in this work is AFN and CMX. The experiments were carried out for four current densities 8.33 mA.cm-2 11.11mA.cm-2 , 13.88mA.cm-2 and 27.77 mA.cm-2. For each current density, a voltage variation of cell and concentrations of H 2 SO 4 and NaOH in the two compartments with the current density was used. The concentration of H 2 SO 4 and NaOH increases with current density and with time, but higher for NaOH. The current efficiency increases with the current applied to the cell. The request for the electro-electrodialysis operation power was calculated in terms of the electrical energy consumed to produce H 2 SO 4 and NaOH for 6 hours of electro-electrodialysis and it was found floating with the current applied and concentration sodium sulphate used and the concentration of H 2 SO 4 and NaOH products, but is comparable for both initial concentrations of sodium sulfate.
Many water resources deal with the increasing of sodium and chloride concentrations above the authorized drinking water levels. In order to minimize these concentrations and to achieve a high water quality in the distribution system, membrane processes are becoming a promising technology. In this study, Reverse Osmosis (RO) and Nanofiltration (NF) have been investigated on drinking water of M'rirt city (Morocco). The influence of different operational conditions (applied pressure, recovery rate) on the removal of NaCl and using three NF membranes (NF270*4040, NF90*4040, TR60) and two RO membranes (BW30LE4040, TM710) was studied. The Spiegler-Kedem model was applied to predict the membranes removal process. Model constants are the reflection coefficient and permeability coefficient. They were optimized using the Levenberg-Marquardt algorithm which solves non-linear least-squares problems using an iterative technique. Good agreement between experimental rejection rates and model predicted rejection rates was obtained. Also, both convective and diffusive components of the solute mass transport have been calculated using another form of the basic thermodynamic equations. This allowed having a better understanding of transport phenomena and a better comparison of membranes performances.
The municipality of M'rirt located in the eastern part of central Morocco, in response to the scarcity of water resources in food, the national Office of Drinking Water has used the coagulation-flocculation for water treatment of Oum Errabia River, process of removing the most delicate phase in suspension by the addition of a body chemical called coagulant. The application of coagulation flocculation process for the treatment of surface water is an interesting alternative as the treatment is fast, cheap and allows obtaining perfectly clear water can fill the deficit in water. In the case of our study, we chose the coagulationflocculation with aluminum sulphate and ferric chloride in order to compare their effectiveness in the elimination or reduction of turbidity on the one hand, and On the other hand see the effectiveness of aluminum sulfate in an acid pH range. The tests are performed in the laboratory and were conducted using a jar test. Ferric chloride showed an effective reduction of the turbidity of water from the aluminum sulfate at low concentrations. The reduction in turbidity of the water by the aluminum sulphate is higher in acid pH (pH 5.5) according to the results obtained from the tests.
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