Patent ID: 7927478

Claim:
A spiral wound module for electrochemical desalination of aqueous salt-containing solutions, said spiral wound module comprising: at least one spiral-wound dilution chamber having first and second spiral side walls and having an inner dilution chamber part; at least one spiral-wound concentrate chamber having an outer concentrate chamber part and an inner concentrate chamber part, such that said inner dilution chamber part and said inner concentrate chamber part in a wound state define an inner, axial cavity; an inner electrode extending in said inner, axial cavity; an outer electrode surrounding said spiral-wound dilution chamber and said spiral-wound concentrate chamber; a plurality of feeds disposed in said first spiral side wall and configured to feed aqueous salt-containing solution to be desalinated into said spiral-wound dilution chamber; a plurality of discharges disposed in the said second spiral side wall and configured to discharge desalinated aqueous solution from said spiral-wound dilution chamber; a first conduit capable of at least one of feeding concentrate into said outer concentrate chamber part and discharging concentrate from said outer concentrate chamber part; and a second conduit capable of at least one of discharging concentrate from said inner concentrate chamber part and feeding concentrate into said inner concentrate chamber part, wherein said outer concentrate chamber part is formed from an outermost winding of said spiral-wound concentrate chamber, in said outermost winding of said spiral-wound concentrate chamber, a distance to said outer electrode is formed by spacers, and said outer concentrate chamber part is in conductive contact with said outer electrode, and wherein said inner concentrate chamber part is formed of a first winding of said spiral-wound concentrate chamber, in said first winding of said spiral-wound concentrate chamber, a distance to a surface of said inner electrode is formed by spacers and said inner concentrate chamber part is in conductive contact with said inner electrode.