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

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Title
Toxicity and degradation of metal-complexed cyanide by a bacterial consortium under sulfate-reducing conditions
Author(s)
Z X Quan; Jin-Woo Bae; Sung-Keun Rhee; Yong Gyun Cho; S T Lee
Bibliographic Citation
Biotechnology Letters, vol. 26, no. 12, pp. 1007-1011
Publication Year
2004
Abstract
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.
Keyword
cyanidedegradationDesulfovibrio, metal complexsulfate reductiontoxicity
ISSN
0141-5492
Publisher
Springer
DOI
http://dx.doi.org/10.1023/B:BILE.0000
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
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