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Dye Decolorization | Open Access Journals
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Journal of Pollution

ISSN: 2684-4958

Open Access

Dye Decolorization

Dyeing effluents have become a vital source of water pollution. Due to the xenobiotic properties and toxicity to all life forms including humans, removal of undesirable color and associated toxicity is crucial. In this study, five dye decolorizing bacteria were isolated from dyeing effluent using selective enrichment culture in Bushnell-Haas (BH) medium amended with co-substrate (i.e. glucose, yeast extract) and 100 mg L−1 of each commercially available reactive dyes viz. Novacron Orange FN-R, Novacron Brilliant Blue FN-R, Novacron Super Black G, Bezema Yellow S8-G and Bezema Red S2-B. The isolated bacteria were identified and assigned as Neisseria sp., Vibrio sp., Bacillus sp., Bacillus sp. and Aeromonas sp. based on their phenotypic (cultural, morphological, physiological and biochemical characteristic) observation. The dye decolorization efficiency was estimated spectrophotometrically up to 6 days of static incubation at 37 °C and observed that all of the isolates were unable to induce decolorization in absence of co-substrate. In case of monoculture, decolorization percentage varies from no visible decolorization (Bezema Red S2-B by Ek-5) to highest 90% decolorization (Novacron Brilliant Blue FN-R by Ek-13) whereas the decolorization percentage of bacterial consortium varies from 65% (Bezema Yellow S8-G) to 90% (Novacron Brilliant Blue FN-R and Novacron Super Black G). The study outlines the co-substrates mediated decolorization process where bacterial consortium proved as efficient dye decolorizer than that of the monocultures. This finding confers possibility of using novel microbial consortium for biological treatment of disreputable dyeing effluents.

 

 

Dye effluents have become a vital source of water pollution. Due to xenobiotic properties and toxicity to all forms of life, including humans, the elimination of unwanted color and associated toxicity is crucial. In this study, five bleaching bacteria were isolated from the dye effluent using a selective enrichment culture in Bushnell-Haas (BH) medium amended with a co-substrate (ie glucose, yeast extract) and 100 mgL -1 of each commercially available reactive dye, viz. Novacron Orange FN-R, Novacron Brilliant Blue FN-R, Novacron Super Black G, Bezema Yellow S8-G and Bezema Red S2-B. Isolated bacteria have been identified and affected as Neisseria sp., Vibrio sp., Bacillus sp., Bacillus sp. and Aeromonas sp. according to their phenotypic observation (cultural, morphological, physiological and biochemical characteristic). The discoloration efficiency of the dye was estimated by spectrophotometry up to 6 days of static incubation at 37 ° C and observed that all the isolates were unable to induce discoloration in the absence of co-substrate. In the case of monoculture, the percentage of discoloration varies from an invisible discoloration (Bezema Red S2-B by Ek-5) to the highest discoloration at 90% (Novacron Brilliant Blue FN-R by Ek-13) while the percentage of discoloration of the bacterial consortium varies from 65% (Yellow Bezema S8-G) to 90% (Novacron Brilliant Blue FN-R and Novacron Super Black G). The study describes the discoloration process mediated by co-substrates where the bacterial consortium has proven to be a dye bleach more effective than that of monocultures. This discovery gives the possibility of using a new microbial consortium for the biological treatment of undesirable dye effluents.

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