Toxicity and degradation of metal-complexed cyanide by a bacterial consortium under sulfate-reducing conditions

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Free cyanide at 1 mM decreased the initial sulfate reduction rate of a batch culture of granular sludge from 0.3 to 0.14 mmol d(-1) g(-1) SS (suspended solid), whereas 0.5 mM cyanide had a minimal effect (0.25 mmol d(-1) g(-1) SS). The order of toxicity of metal-complexed cyanides to the sludge was as follows: zinc-complexed cyanide (most toxic) > free cyanide = nickel-complexed cyanide > copper-complexed cyanide (least toxic), which also corresponds well with the order of the stability (dissociation) constants of the metal-cyanide complexes. A consortium degrading cyanide was enriched using nickel cyanide as the sole nitrogen source. This consortium completely removed 0.5 mM of nickel-complexed cyanide under sulfate-reducing conditions in 11 d. Analysis of clone library of 16S rRNA genes shows that the consortium was composed of three major phylotypes including Desulfovibrio.
Publisher
SPRINGER
Issue Date
2004-06
Language
English
Article Type
Article
Keywords

WASTE-WATER; BIODEGRADATION; COMBINATION

Citation

BIOTECHNOLOGY LETTERS, v.26, pp.1007 - 1011

ISSN
0141-5492
DOI
10.1023/B:BILE.0000030048.04282.da
URI
http://hdl.handle.net/10203/79556
Appears in Collection
BS-Journal Papers(저널논문)
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