Detoxification of azo dyes in the context of environmental processes

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 (Cu2+>Zn2+>Cd2+>Cr6+). Strain Gb30 was used to assess the effect of heavy metals presence on RB5 decolourization. The strain growth exhibited different responses at a fixed concentration of EC50 (10 h) for each heavy metal. The addition of Zn2+ and Cd2+ had no effect on decolourization yield after 24 h of incubation, whereas Cr6+ and Cu2+ 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 RB5 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.

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“…; Rawat et al . ). Among these pollutants, dyes and heavy metals represent the major threat of aquatic and soil ecosystems (Maqbool et al .…”

Section: Introductionmentioning

confidence: 97%

Modelling of Reactive Black 5 decolourization in the presence of heavy metals by the newly isolated Pseudomonas aeruginosa strain Gb30

et al. 2019

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“…Amb. Sustent., 2016, v. 3, n. 6, p. 375-384. indústrias do setor têxtil (Dallago e Smaniotto, 2005;Rawat et al, 2016).…”

Section: Introductionunclassified

Otimização do processo de remoção do corante preto de remazol B por uso de biomassa mista de Aspergillus niger van Tieghem, 1867 (Ascomycota: Trichocomaceae) e Pennisetum purpureum Schumach., 1827 (Poales: Poaceae)

Filho¹,

Ferreira²,

Silva³

et al. 2016

Rev. Bras. Gest. Amb. Sustent.

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As indústrias do setor têxtil geram no final de seu processo efluentes com elevada carga orgânica, substâncias tóxicas e cor. O lançamento dessas águas residuais nos corpos hídricos, pode causar sérios problemas do ponto de vista ambiental. Dentre as tecnologias destinadas à remoção de cor destaca-se a biossorção, um processo de captação passiva onde os poluentes depositam-se na superfície de materiais de origem biológica (biossorventes). As vantagens da biossorção em relação aos métodos convencionais de tratamento são a alta seletividade e eficiência, baixo custo e regeneração do material. Considerando esse fato, o objetivo desse trabalho foi produzir um biossorvente misto utilizando o fungo Aspergillus niger van Tieghem, 1867 (Ascomycota: Trichocomaceae) crescido em Pennisetum purpureum Schumach., 1827 (Poales: Poaceae) (capim elefante), para a remoção do corante têxtil preto de remazol B pelo processo de biossorção. Para os ensaios de remoção foi aplicado um planejamento fatorial 25 a fim de analisar a influência das variáveis: pH (2,0, 3,5 e 5,0), agitação (150, 200 e 250 rpm), temperatura (30, 40 e 50 oC), concentração de corante (25, 55 e 85 mg L-1) e quantidade de biossorvente misto (0,5, 1,5 e 2,5 g). A melhor condição obtida no planejamento foi pH 2,0, temperatura de 50 oC, agitação de 150 rpm, concentração de biomassa de 0,5 g e concentração de corante de 25 mg L-1, resultando numa remoção de 96,80%. O estudo permitiu verificar que a utilização de biomassa fúngica associada a um vegetal pode se tornar uma nova alternativa barata e eficiente para o tratamento de efluentes têxteis.

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“…Inefficient textile dyeing process results in the release of large amount of dyes in effluent which is directly discharged into the water bodies Mahmood et al, 2011;Kurade et al, 2016;Rawat et al, 2016). About 10-15% of dyestuff is discharged into environment during manufacturing and usage of these dyes (Verma and Madamwar, 2002;Andleeb et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Bacterial Strains Isolated from Textile Wastewater for Degradation of Azo Dye Associated Aromatic Amines

Kausar¹,

Khalid²,

Mahmood³

et al. 2016

IJAB

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Wastewater from textile processing and dyestuff manufacturing industries contains different kinds of dyes and their metabolites, which are mutagenic and carcinogenic in nature. Such wastewater should be treated in order to avoid ground and surface water contamination. The aim of present research was to isolate such bacterial strains which are capable of degrading dye-originated aromatic amines. Ten samples of wastewater and sludge were collected from outlets and wastewater streams of different textile industries. The analysis of wastewater showed a wide variation in the pH (8.10-12.3), total dissolved solids (500-20100 mg L ) using 10 mL wastewater/sludge as inoculum source. Based on ability to degrade 4-nitroaniline most efficient bacterial strain was identified as Raoultella planticola (IL11) through 16S rRNA gene analysis. These findings suggest that the indigenous bacterial strains have potential for bioremediation of dye-containing textile effluents, and for complete mineralization, 4-nitroaniline degrading strains may be used in combination with dye degrading strains.

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Detoxification of azo dyes in the context of environmental processes

Cited by 297 publications

References 105 publications

Modelling of Reactive Black 5 decolourization in the presence of heavy metals by the newly isolated Pseudomonas aeruginosa strain Gb30

Modelling of Reactive Black 5 decolourization in the presence of heavy metals by the newly isolated Pseudomonas aeruginosa strain Gb30

Otimização do processo de remoção do corante preto de remazol B por uso de biomassa mista de Aspergillus niger van Tieghem, 1867 (Ascomycota: Trichocomaceae) e Pennisetum purpureum Schumach., 1827 (Poales: Poaceae)

Efficacy of Bacterial Strains Isolated from Textile Wastewater for Degradation of Azo Dye Associated Aromatic Amines

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