Method and apparatus for reducing scaling in electrodeionization

Details Method and apparatus for reducing scaling in electrodeionization Method and apparatus for reducing scaling in electrodeionization

1998-08-03

2000-05-02

Drodge, Joseph W.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210652, 210669, 210685, 210805, 210696, 204524, 204525, B01D 1504, B01D 6148, B01D 6102, B03D 306

Patent

active

06056878&

ABSTRACT:
A method and apparatus for inhibiting scaling in an electrodeionization system or in a combined reverse osmosis/electrodeionization system for water treatment and, more particularly, for increasing tolerance to hardness in the feed water to an electrodeionization unit to inhibit precipitation of metal cations contained in the feed water and for increasing efficiency of the electrodeionization system. Water to be purified is passed through a electrodeionization unit in which a concentrate stream recycling through concentrating compartments and anode and cathode compartments contains effective amounts of an antiscalant to inhibit precipitation of scale. One or more preliminary reverse osmosis units in series with the electrodeionization unit preferably receives a portion of the antiscalants in the concentrate stream. The antiscalant in the water fed to the reverse osmosis unit can be supplemented and adjusted. Electrolyte can be provided to the concentrate stream of the electrodeionization unit from products of the reverse osmosis.

REFERENCES:
patent: 4676908 (1987-06-01), Ciepiela et al.
patent: 5358640 (1994-10-01), Zeiher et al.
patent: 5837124 (1998-11-01), Su et al.
Studies on polarity reversal with continuous deionization--Desalination, 86 (1992) by Yoram Oren and Yair Egozy (pp. 155-171).

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