Response surface modeling of bioremediation of acid black 52 dye using Aspergillus flavus

Bioremediation is an efficient process to remove metals and dyes from solutions using different micro-organisms. In the present study, the efficiency of growing Aspergillus flavus (isolated from the effluent of an electroplating industry) to treat a synthetic solution of acid black 52 dye (a trivale...

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Bibliographic Details
Published in:Water science and technology 2017-06, Vol.75 (12), p.2864-2874
Main Authors: Ghosh, Arpita, Dastidar, Manisha Ghosh, Sreekrishnan, T R
Format: Article
Language:English
Subjects:
Acids
Biomass
Bioreactors
Bioremediation
Chromium
Color
Color removal
Copper
Desalination
Dyes
Effluents
Electroplating
Energy dispersive X ray analysis
Hazardous materials
Laboratories
Metals
Modelling
Organisms
Response surface methodology
Studies
Trivalent chromium
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Summary:Bioremediation is an efficient process to remove metals and dyes from solutions using different micro-organisms. In the present study, the efficiency of growing Aspergillus flavus (isolated from the effluent of an electroplating industry) to treat a synthetic solution of acid black 52 dye (a trivalent chromium complex dye) was investigated. Maximum removal of dye and chromium was observed to be 390 and 17.22 mg/L, respectively, at an initial dye concentration of 750 mg/L and at pH 4.5 in 50 hours in a batch bioreactor. The biomass concentration was reduced from 4.1 to 0.4 g/L with increasing dye concentration from 100 to 2,000 mg/L. The response surface modeling for color removal was performed using the range of initial dye concentration 200-400 mg/L, pH 4-6 and time 35-50 hours. The optimum conditions for maximum color removal (76.52%) were observed at initial dye concentration: 200 mg/L, pH: 4.75 and time: 50 hours. The deviation (-0.02%) showed a close agreement between the experimental and predicted values of color removal. The scanning electron microscopic and energy dispersive X-ray analyses indicated bioremediation of the dye.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2017.167