Anthraquinone-2,6-disulfonate (AQDS) as a catalyst to enhance the reductive decolourisation of the azo dyes Reactive Red 2 and Congo Red under anaerobic conditions

Costa, Mayara Carantino; Mota, Suetônio; Nascimento, Ronaldo F.; Santos, André Bezerra dos

doi:10.1016/j.biortech.2009.08.015

Cited by 47 publications

(22 citation statements)

References 26 publications

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“…The nitroreduction could be mostly accelerated in the presence of redox mediators, which are usually used in the reduction of nitroaromatics and azo compounds (Costa et al 2010). In this study, redox mediator AQDS was chosen to increase reduction of 4-NNA.…”

Section: Enrichment and Isolation Of Nitro-reducing Bacteriummentioning

confidence: 99%

Isolation and characterization of an efficient nitro-reducing bacterium, Streptomyces mirabils DUT001, from soil

Xie

Yang

2009

World J Microbiol Biotechnol

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A bacterial strain, designated as DUT001, was isolated from soil samples collected in Qingpu, Shanghai, China, and found to be capable of reducing nitro polycyclic aromatic compounds and polynitrated aromatic compounds. It was identified as Streptomyces mirabils based on morphological and physiological-biochemical properties, as well as 16S rDNA sequences and phylogenetic analysis. The optimum growth temperature and pH for Streptomyces mirabils DUT001 are 28°C and 7.2, respectively. The best carbon source and nitrogen source are glucose and yeast extract. Streptomyces mirabils DUT001 exhibited highly efficient activity in reduction of nitroaromatic compounds, 4-nitro-1, 8-naphthalic anhydride (4-NNA), 3-nitro-1, 8-naphthalic anhydride, 4-nitrophthalimide, 3-nitrophthalimide 1, 3-dinitrobenzene, and 1, 4-dinitrobenzene, to their amino derivatives with yields ranging from 70-99% under mild conditions. 1% (w/v) of the nonionic surfactant, Triton X-100 and 0.1 mM of redox mediator, anthraquinone-2, 6-disulfonate (AQDS), could accelerate the nitroreduction process. The bioreduction activity of the Streptomyces mirabils DUT001 offers its application potentials in bioremediation of nitroaromatic compounds and synthesis of important amino derivatives.

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Section: Enrichment and Isolation Of Nitro-reducing Bacteriummentioning

confidence: 99%

Isolation and characterization of an efficient nitro-reducing bacterium, Streptomyces mirabils DUT001, from soil

Xie

Yang

2009

World J Microbiol Biotechnol

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“…The authors attributed this result to the low dye concentration tested associated with the high biomass concentration in the reactor, which may have caused the decolourisation reactions to follow zero-order kinetics, therefore masking the AQDS effect. Additionally, for non-recalcitrant dyes such as Congo Red (CR), which has a linear molecular structure that allows easy chromophore reduction, the addition of a redox mediator compound in an anaerobic reactor, also fed with the same sludge source used in the present investigation, did not result in very evident colour removal, even when very high CR concentrations were employed (> 800 mg/L) (Costa et al, 2010).…”

Section: Resultsmentioning

confidence: 92%

“…However, colour removal by aerobic bacteria, such as those commonly present in activated sludge systems, is normally low (Dos Santos et al, 2007) and is mainly associated with dye adsorption in the sludge (Alinsafi et al, 2006). On the other hand, under anaerobic conditions, effective dye decolourisation can be reached (Costa et al, 2010;Dos Santos et al, 2005b;Firmino et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Applicability of anthraquinone-2,6-disulfonate (AQDS) to enhance colour removal in mesophilic UASB reactors treating textile wastewater

Firmino¹,

Silva²,

Mota³

et al. 2011

Braz. J. Chem. Eng.

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-This work assessed the applicability of the redox mediator anthraquinone-2,6-disulfonate (AQDS) to enhance colour removal in mesophilic UASB reactors treating textile wastewater under different operational conditions, such as different electron donor (ethanol) concentrations and different HRT. The anaerobic reactors were able to remove reasonably well the colour of the textile wastewater (35-63%) even when operated with a relatively short HRT (6 h), being a good option for textile effluents pre-treatment. Aditionally, colour removal efficiency was positively influenced not only by the addition of ethanol as external electron donor, but also by the initial wastewater absorbance. Although the applicability of AQDS is reported in the literature to enhance remarkably colour removal from synthetic dye-containing wastewaters, especially for recalcitrant azo dyes, the same effect was not evident in the present study with the textile wastewater tested, since the reactors did not show significant differences on decolourisation capacity.

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“…there was a statistical difference between these experimental periods (p<0.001). These results showed that RB5 is more recalcitrant than CR since the linear molecule structure of the latter allows easy chromophore reduction even when very high CR concentrations were applied (>800 mg/L) at a shorter HRT (8-12 h) [9,30]. Additionally, colour removal is more difficult with highly substituted and high molecular weight dyes such as RB5 [28].…”

Section: Colour Removalmentioning

confidence: 85%

“…However, colour removal by aerobic bacteria, such as those commonly present in activated sludge systems, is normally low [3], which is mainly associated with dye adsorption on the sludge [6,7]. On the other hand, under anaerobic conditions, effective dye decolourisation can be reached [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Sequential Anaerobic/Aerobic Treatment of Dye-Containing Wastewaters: Colour and COD Removals, and Ecotoxicity Tests

Silva

Firmino

Sousa

et al. 2012

Appl Biochem Biotechnol

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Colour and COD removals of the azo dyes Congo Red (CR) and Reactive Black 5 (RB5) were individually evaluated in a sequential anaerobic/aerobic treatment system. Additionally, dye toxicity was assessed by using acute ecotoxicity tests with Daphnia magna as the indicator-organism. The anaerobic reactor was operated at approximately 27 °C and with hydraulic retention times of 12 and 24 h. The aerobic reactor was operated in batch mode with a total cycle of 24 h. During anaerobic step, high colour removals were obtained, 96.3% for CR (400 mg/L) and 75% for RB5 (200 mg/L). During the aerobic phase, COD effluent was considerably reduced, with an average removal efficiency of 52% for CR and 85% for RB5, which resulted in an overall COD removal of 88% for both dyes. Ecotoxicity tests with CR revealed that the anaerobic effluent presented a higher toxicity compared with the influent, and an aerobic post-treatment was not efficient in reducing toxicity. However, the results with RB5 showed that both anaerobic and aerobic steps could decrease dye toxicity, especially the aerobic phase, which removed completely the toxicity in D. magna. Therefore, the anaerobic/aerobic treatment is not always effective in detoxifying dye-containing wastewaters, sometimes even increasing dye toxicity.

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Anthraquinone-2,6-disulfonate (AQDS) as a catalyst to enhance the reductive decolourisation of the azo dyes Reactive Red 2 and Congo Red under anaerobic conditions

Cited by 47 publications

References 26 publications

Isolation and characterization of an efficient nitro-reducing bacterium, Streptomyces mirabils DUT001, from soil

Isolation and characterization of an efficient nitro-reducing bacterium, Streptomyces mirabils DUT001, from soil

Applicability of anthraquinone-2,6-disulfonate (AQDS) to enhance colour removal in mesophilic UASB reactors treating textile wastewater

Sequential Anaerobic/Aerobic Treatment of Dye-Containing Wastewaters: Colour and COD Removals, and Ecotoxicity Tests

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