By Beier S.P.
Electrically pushed membrane approaches, and electrodialysis specifically, are very important unit operations, specially in the box of desalination - making tab water from sea water. Electrically pushed membrane procedures might be brought. very important phrases equivalent to serious present density, desalination measure, and present potency may be defined via illustrations and a large number of examples. hence, you may be acquainted with the elemental ideas and conception inside of this significant box on a bachelor or grasp of technological know-how point.
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3 Desalination degree An import factor concerning the performance of an electrodialysis system is the desalination degree. The desalination degree indicates how large an amount of the salt in the diluate stream that is removed during one passage through the membrane stack. The desalination degree S can be calculated from the following equation: Please click the advert S c d ,in c d ,out c d ,in , SI units : S ª § mole · º «¨ m3 ¸ » ¹» «© « § mole · » « ¨© m 3 ¸¹ » ¼ ¬ >@ ( 15) We have ambitions.
It is seen in Figure 12 that the thermodynamic efficiency throughout the whole experiment is very low and in all cases below 4 %. It is also seen that at low voltage the thermodynamic is higher than at large voltage. An explanation could be that at these conditions the irreversible processes at the electrodes do not play as large a role at when the voltage is increased. Therefore the efficiency at low voltage is “closer” the thermodynamic least amount of required energy than at larger voltage. 6 Anti-fouling mechanism When electrodialysis is applied commercially to desalt seawater, fouling of the ion exchange membranes can be a severe problem as in every other membrane separation process.
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