Aerobic cyanide degradation by bacterial isolates from cassava factory wastewater

AUTOR(ES)

Kandasamy, Sujatha, Dananjeyan, Balachandar, Krishnamurthy, Kumar, Benckiser, Gero

FONTE

Braz. J. Microbiol.

DATA DE PUBLICAÇÃO

2015-09

RESUMO

Ten bacterial strains that utilize cyanide (CN) as a nitrogen source were isolated from cassava factory wastewater after enrichment in a liquid media containing sodium cyanide (1 mM) and glucose (0.2% w/v). The strains could tolerate and grow in cyanide concentrations of up to 5 mM. Increased cyanide levels in the media caused an extension of lag phase in the bacterial growth indicating that they need some period of acclimatisation. The rate of cyanide removal by the strains depends on the initial cyanide and glucose concentrations. When initial cyanide and glucose concentrations were increased up to 5 mM, cyanide removal rate increased up to 63 and 61 per cent by Bacillus pumilus and Pseudomonas putida. Metabolic products such as ammonia and formate were detected in culture supernatants, suggesting a direct hydrolytic pathway without an intermediate formamide. The study clearly demonstrates the potential of aerobic treatment with cyanide degrading bacteria for cyanide removal in cassava factory wastewaters.

Documentos Relacionados

• Degradation of the metal-cyano complex tetracyanonickelate(II) by cyanide-utilizing bacterial isolates.
• In vitro degradation of linamarin by microorganisms isolated from cassava wastewater treatment lagoons
• Carbaryl degradation by bacterial isolates from a soil ecosystem of the Gaza Strip
• Degradation of Estrogens by Rhodococcus zopfii and Rhodococcus equi Isolates from Activated Sludge in Wastewater Treatment Plants
• Bacterial Degradation of Cyanide and Its Metal Complexes under Alkaline Conditions