Method for the purification of waste water containing silver

Details Method for the purification of waste water containing silver Method for the purification of waste water containing silver

1993-12-30

1995-06-13

McCarthy, Neil

Liquid purification or separation

Processes

Ion exchange or selective sorption

210727, 210729, 210732, 210734, 210912, C02F 162, C02F 154, C02F 156

Patent

active

054239907

ABSTRACT:
A process is disclosed for the purification of waste water containing a silver compound, comprising the steps of (1) adding to said waste water a salt of a poly(guanidine) or poly(biguanidine) polymer (2) adding a flocculant, and (3) filtrating the formed flocculate.
The invention is particularly suitable for the removal of silver from the effluent of a photographic processor, and more specifically the effluent of a processor of wash-off materials, said effluent also containing gelatin.
A most preferred poly(guanidine) compound is poly(hexamethyleneguanidine) hydrochloride.

REFERENCES:
patent: 4155810 (1979-05-01), Kitajima et al.
patent: 4755453 (1988-07-01), Kunda et al.
patent: 4814007 (1989-03-01), Lin et al.
patent: 4874530 (1989-10-01), Kobayashi et al.
patent: 4895597 (1990-01-01), Lin et al.
patent: 4992200 (1991-02-01), Lin et al.
patent: 5028259 (1991-07-01), Lin et al.
patent: 5078978 (1992-01-01), Tarbet et al.

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