Process for removing silver in the presence of iron from waste e

Details Process for removing silver in the presence of iron from waste e Process for removing silver in the presence of iron from waste e

1998-08-13

2000-10-03

Simmons, David A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210713, 210912, 423 42, 430399, C02F 156, C02F 162, G03C 526

Patent

active

061268402

ABSTRACT:
Process and apparatus for treating an aqueous effluent with high concentrations of silver and ferric/ferrous complexes using multiple additions of one or more water-soluble sulfur containing polymer chelating agents, with optional additions of non-polymeric sulfur containing compounds. The presence of a high concentration of both dissolved silver and ferric/ferrous complexes prevents efficient silver removal by precipitation and the achievement of a very low residual silver concentration. By using multiple additions of the chelating agent(s), a higher degree of silver removal can be achieved than would be possible with the same amount of chelating agents added in a single stage. Effluent from photo finishing operations, particularly minilabs, can be effectively treated so that there is essentially no silver remaining in the treated effluent.

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