use of solid waste of a nylon-6 plant as a nutrient for bacterial decolourisation of dyes

Three caprolactam-degrading bacterial isolates grew in liquid synthetic medium containing solubilised solid waste of a nylon-6 production plant as the sole source of carbon and nitrogen. Typically, the caprolactam content of solid waste was decreased by 95% in 72 h by Alcaligenes faecalis. A. faecal...

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Bibliographic Details
Published in:World journal of microbiology & biotechnology 2007-09, Vol.23 (9), p.1321-1326
Main Authors: Baxi, Nandita N, Shah, Avinash K
Format: Article
Language:English
Subjects:
Alcaligenes
Alcaligenes faecalis
Bacteria
Biological and medical sciences
Biological treatment
Biotechnology
Caprolactam
Color removal
Dye decolourisation
Dyes
Fundamental and applied biological sciences. Psychology
Microbiology
Nitrogen
Nylon-6 plant
Solid oligomeric waste
Solid wastes
Yeasts
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Summary:Three caprolactam-degrading bacterial isolates grew in liquid synthetic medium containing solubilised solid waste of a nylon-6 production plant as the sole source of carbon and nitrogen. Typically, the caprolactam content of solid waste was decreased by 95% in 72 h by Alcaligenes faecalis. A. faecalis was the most potent caprolactam-degrading bacterium out of the three isolates. The biomass of the bacteria obtained by growth in the solubilised solid waste medium had the ability to decolourise some synthetic azo and triphenylmethane dyes. Decolourisation of dyes was obtained in static condition, in synthetic medium which contained only the components of the solid waste as the sole sources of carbon and nitrogen and also in nutritionally rich medium. The supplementation of yeast extract to solid waste medium did not increase the efficiency of decolourisation in case of two of the bacterial cultures. Depending on the dye, medium and bacteria used, decolourisation in the range of 35-94% was achieved in 48-96 h. The decolourisation was not due to the adsorption of the dyes by the bacterial biomass except in case of Procion Blue MR and Black B. Based on these observations, the simultaneous biological treatment of the solid waste of nylon-6 plant and the decolourisation of synthetic dyes present in wastewater or solid waste is envisaged.
ISSN:0959-3993
1573-0972
DOI:10.1007/s11274-007-9360-4