Combined membrane and sorption process for selective ion removal

Details Combined membrane and sorption process for selective ion removal Combined membrane and sorption process for selective ion removal

1987-07-14

1989-02-21

Cintins, Ivars

Liquid purification or separation

Processes

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

210669, 210790, B01D 1300, B01D 1504

Patent

active

048062448

ABSTRACT:
A combined membrane/sorption process is used to selectively remove ions from liquid streams. As an example, nitrate ions can be more effectively removed from an aqueous stream also containing sulfate ions. Sulfate ions normally are not required to be removed from drinking water, but are typically sorbed by the available ion exchange resins and result in inefficient use of the ion exchange capacity. The disclosed process and apparatus use an ion selective membrane to first remove the sulfate ions from the stream and then remove the nitrate ions by ion exchange.

REFERENCES:
patent: 4206048 (1980-06-01), Guter
patent: 4479877 (1984-10-01), Guter
patent: 4661257 (1987-04-01), Kreevoy et al.
"Nitratreduzierung in Trinkwasser un Brauchwasser fur Lebensmittelbetriebe", by Rolf Nagel, Wasserwirtschaft, 75 (1985), No. 6, pp. 257-262 (with translation).
"Reverse Osmosis and/or Ion Exchange? Using Them Together For Water Demineralization"., Product literature from the Dow Chemical Company.

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