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Advances in Biological Cyanide Detoxification.

Authors
Altringer-PB; Lien-RH; Dinsdale-BE
Source
Paper in Randol Gold Forum Vancouver '92 Proceedings Randol Int'l Ltd 1992 :395-400
Link
NIOSHTIC No.
10011282
Abstract
The U.S. Bureau of Mines is investigating biodegradation of cyanide as a means of decommissioning heap leach operations. Biological oxidation decreased weak acid dissociable (wad) cyanide in process solutions from 50 to 170 ppm down to 0.1 Ppm. The tests were conducted both in trickling column reactors, using quartz as the growth surface, and in upflow columns, using activated carbon as the growth surface. In addition, exploratory tests indicated that bacteria will destroy residual cyanide in leached ore. A flowsheet has been proposed for closure of heap leach operations in which the metals-processing portion of the plant, possibly the carbon adsorption columns, or a collection pond is used as a bioreactor. The cyanide in the process solution is destroyed in the bioreactor, and the treated water is used to rinse residual cyanide from the spent heaps. The water is recycled until the effluent wad cyanide concentration meets discharge standards.
Publication Date
19920101
Document Type
OP;
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
OP 55-92
NIOSH Division
SLRC;
Source Name
Paper in Randol Gold Forum, Vancouver '92 Proceedings. Randol Int'l, Ltd., 1992, PP. 395-400
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