DEEP DEMINERALIZATION OF SEA WATER BY THE ELECTRODIALYSIS METHOD
Abstract
The chosen method of the electro dialysis desalting belongs to thearea of membrane technology which is perspective for deep demineralization of water solutions with concentration of salts in sea water to 35 g/l and rigidity to 120 mg∙ekv/l (World Ocean). Two options of deep demineralization of water solutions were considered: one of which was considered as an desalinationand softening of water of the Lower-Dneprovsky pool, for feed of package boilers after capital repairs was considered; the second option provides desalting of sea water with concentration of salt from 16 g/l (The Black Sea basin) and to 35 g/l (World Ocean). Besides the deep demineralization of sea water it is necessary to consider that it represents water solution of multicomponent elements (there are 11 main components), which are the concentrated electrolytes almost completely dissociate on ions. Three main settlement schemes for desalting of sea water are considered. Taking into account deep demineralization of water solutions the direct-flow scheme with a direct-flow and countercurrent of brine solution which is technologically easily realized on sea vessels and is chosen to conform requirements of the Register. The use of the direct-flow scheme is possibly at rather high relation of concentration of brine solution to thedilutewhat is characteristic for desalting of sea water. From the other side selection of sea water and dumping of brinesolution does not break ecology of seas and oceans.
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