Modelling hybrid systems for seawater desalination: electromembrane processes (RED, ARED and ED) coupled with RO

Risultato della ricerca: Conference contribution

Abstract

The need to reduce energy consumption in seawater reverse osmosis processes has pushedresearch towards the development of new hybrid systems in which, for example, other membraneprocesses can be used to pre-treat seawater. Electrodialysis and reverse electrodialysis can act asa dilution step before seawater enters the RO unit, thus leading to an important energy saving inRO. In this work, two coupled models are proposed for the RED-RO and ED-RO system. Eachprocess model was validated before being used for a sensitivity analysis in which the effect of theintegration on the cost saving in the overall process was assessed. The analysis was performedby changing (R)ED voltage and RO pressure and considering three different scenarios: a standardscenario, an optimist scenario with a lower membrane cost and a pessimistic scenario with a lowerelectricity cost and comparing the result with the a standalone RO process. Negative values of“Cost Saving” were found when an excessive dilution step was performed before the RO, whilecompetitive scenarios were found by optimizing the dilution extent, especially for the RED-RO case.
Lingua originaleEnglish
Titolo della pubblicazione ospiteDesalination for the Environment Clean Water and Energy book of abstracts
Numero di pagine2
Stato di pubblicazionePublished - 2018

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