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Modelling of Reactive Black 5 decolourization in the presence of heavy metals by the newly isolated Pseudomonas aeruginosa strain Gb30
Author(s) -
Louati I.,
Hadrich B.,
Nasri M.,
Belbahri L.,
Woodward S.,
Mechichi T.
Publication year - 2019
Publication title -
journal of applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 1364-5072
DOI - 10.1111/jam.14262
Subject(s) - pseudomonas aeruginosa , heavy metals , chemistry , bioaugmentation , strain (injury) , microbiology and biotechnology , bacteria , metal , pseudomonadaceae , ec50 , contamination , bioremediation , metal ions in aqueous solution , pseudomonadales , nuclear chemistry , environmental chemistry , biology , biochemistry , in vitro , organic chemistry , ecology , genetics , anatomy
Aim The effect of heavy metals presence on the decolourization of Reactive Black 5 by Pseudomonas aeruginosa was evaluated. Methods and Results In the current study, a newly isolated strain identified as P. aeruginosa strain Gb 30 was selected for its ability to remove high concentration of Reactive Black 5 and resistance to several heavy metals (Cu 2+ >Zn 2+ >Cd 2+ >Cr 6+ ). Strain Gb30 was used to assess the effect of heavy metals presence on RB 5 decolourization. The strain growth exhibited different responses at a fixed concentration of EC 50 (10 h) for each heavy metal. The addition of Zn 2+ and Cd 2+ had no effect on decolourization yield after 24 h of incubation, whereas Cr 6+ and Cu 2+ ions reduced decolourization up to 17%. In order to understand the relationship between heavy metals contamination and decolourization, experimental data relating the initial decolourization rate of RB 5 to the concentrations of single and associated heavy metals were fitted to three different inhibition kinetic models. Conclusions In this study, we showed that P. aeruginosa strain Gb30 could be used for dye removal even at high concentrations of heavy metals. The developed models could provide basic information that may help for the best management of the bacteria‐mediated decolourization process at the industrial scale. Significance and Impact of the Study This study opens new directions for the management of textile industry wastewaters containing dyes and heavy metals using bioaugmentation by P. aeruginosa strain Gb30.