Method and apparatus for recovering charged ions from solution

Details Method and apparatus for recovering charged ions from solution Method and apparatus for recovering charged ions from solution

1980-02-01

1982-11-02

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204237, 204299R, 204DIG13, 210651, B01D 1302, B01D 5702, C25B 1508

Patent

active

043572200

ABSTRACT:
An apparatus and method for removing charged ions from solution by treating the solution with electrodialysis followed by Donnan dialysis. One of many applications is for treating the baths associated with the metal finishing, e.g. plating, anodizing, or etching, industry. For example, charged ions can be removed from the rinse baths of a plating line by treating the rinse water of a first rinse bath following the plating bath with an electrodialysis unit and returning the concentrated solution to the plating bath, and treating a second rinse bath following the first rinse bath with a Donnan dialysis unit to produce an additional concentrated solution and a diluted effluent which may be either discharged into a sewer or stream, or readily destroyed.

REFERENCES:
patent: 3454490 (1969-07-01), Wallace
patent: 3674669 (1972-07-01), Tuwiner
patent: 3766049 (1973-10-01), Smith
patent: 3806436 (1974-04-01), Tuwiner
patent: 3909381 (1975-09-01), Ehrsam
patent: 3926759 (1975-12-01), Horn et al.
patent: 4229280 (1980-10-01), Horn
Kelley et al., "Metal Ion Recovery From Aqueous Industrial Wastes", Dupont Innovation, vol. 4, #2, Winter 1973.
Donnan Dialysis System for Metals Recovery Using Nafion.RTM. Mass Exchangers.

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