Decolorization and Partial Degradation of Selected Azo Dyes by Methanogenic Sludge

Yemashova, N.; Telegina, A. A.; Kotova, Irina; Netrusov, A. I.; Kalyuzhnyi, S.

doi:10.1385/abab:119:1:31

Cited by 22 publications

(9 citation statements)

References 9 publications

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“…Anaerobic granular sludge (10 g VSS/l, aceticlastic activity of 0.19 g CH 4 -COD/g/VSS/l) from the EGSBreactor treating brewery wastewater (Efes-Moscow) was used for experiments in the basal medium as described by Yemashova et al (2004).…”

Section: Methodsmentioning

confidence: 99%

“…The presence of such compounds in the industrial wastewater may create serious environmental problems due to toxicity for aquatic life and mutagenecity to humans (Hildenbrand et al, 1999). In spite of persistence to biodegradation under aerobic conditions (Pearce et al, 2003;Yemashova and Kalyuzhnyi, 2005), azo dyes undergo reductive splitting of the azo bond relatively easily under anaerobic conditions (Kalyuzhnyi and Sklyar, 2000;Pearce et al, 2003;Yemashova et al, 2004) releasing corresponding aromatic amines. The extensive investigations with a wide range of azo dye structures revealed that anaerobic decolourisation is a microbiologically non-specific process (Pearce et al, 2003;Yemashova and Kalyuzhnyi, 2006); moreover, it seems to be a common property of any anaerobic and even aerobic (Bromley-Challenor et al, 2000) sludge.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of anaerobic biodecolourisation of azo dyes

Kalyuzhnyi

Yemashova

Fedorovich

2006

Water Science and Technology

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Kinetics of anaerobic biodecolourisation (methanogenic environment) of four azo dyes (Acid Orange 6, Acid Orange 7, Methyl Orange and Methyl Red) was investigated with regard to their electrochemical properties as well as under variation of dye and sludge concentrations, pH and temperature. Cyclic voltammetry revealed a correlation between the potential of irreversible reduction peak of the dye and its first-order decolorisation constant. For each dye tested, this decolourisation constant was adversely proportional to dye concentration (0.086 -1.7 mM) and had a saturation (hyperbolic) dependency on sludge concentration (0.04 -1.1 g VSS/l), a bell-shape dependency on pH (4.0-9.0) and Arrhenius dependency on temperature (24 -40 8C). Transfer from methanogenic to sulphate reducing environment led to an increase of decolorisation constant for all the dyes investigated due to the abundant presence of sulphide as a reducing agent in the reaction medium. Similar transfer to a denitrifying environment resulted in an almost complete decease of decolourisation because nitrate easily outcompetes azo dyes as an electron acceptor.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetics of anaerobic biodecolourisation of azo dyes

Kalyuzhnyi

Yemashova

Fedorovich

2006

Water Science and Technology

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“…For example, ubiquitous sources of electrons, which is reduced forms of NAD(P)H, is able to reduce azo dyes in the absence of many enzymes [31]. Another extracellular reducing agent sulfide produced via respiration by sulfate-reducing bacteria also chemically decolorizes azo dyes [32,33]. Azo dye reduction was greatly accelerated by the addition of redox mediators such as anthraquinone-sulfonate [34].…”

Section: Chemical Treatment Of Azo Dyesmentioning

confidence: 99%

Decolorization of Azo Dyes by Immobilized Bacteria

Khan

Banerjee

2010

The Handbook of Environmental Chemistry

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Synthetic organic dyes are essential for satisfying the ever growing demand in terms of quality, variety, and speed of coloration of large number of substances. Because of the xenobiotic nature of dyes, they are toxicant to biological system and causes serious damage to environment. Ever-increasing concerns about color in the effluent lead to the worldwide efforts to build up effective procedure for color elimination. Biodegradation is gaining popularity to clean up hazardous waste because of the clear picture of the costs and the benefits of microbial degradation. Removal of dyes from waste water is reviewed with respect to biological decolorization. Promising techniques with reference to biological treatment of wastewater are immobilization of microorganisms on different supports. Immobilization increases the stabilities of the enzyme at high pH and tolerance to elevated temperatures and to make the enzyme less vulnerable to inhibitors. Generally the covalent bonds during immobilization enhance stabilities of enzymes due to the limitation of conformational changes.

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“…Studies have also demonstrated that ubiquitous sources of electrons, such as reduced forms of nicotinamide adenine dinucleotide (phosphate) (NAD(P)H), were able to reduce azo dyes, even in the absence of microbes or enzymes [15]. Another extracellular reducing agent-sulfide-produced via respiration by sulfatereducing bacteria has been shown to decolorize azo dyes chemically [16,17]. Van der Zee and Villaverde [18] have also reported that the initial step in the biodegradation of azo dyes is the cleavage of the azo bond, a reaction catalyzed by the enzyme azoreductase.…”

Section: Introductionmentioning

confidence: 99%

Influence of redox mediators and media on methyl red decolorization and its biodegradation by Providencia rettgeri

et al. 2019

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Developing efficient, effective and low-cost procedure for color removal in wastewater is a serious environmental concern. In this study, we investigated the possibility of enhancing the activities of dyes decolorizing bacterium using selected redox mediators and media (nutrient broth, yeast, glucose, starch and peptone). The isolated organism identified using 16S rRNA gene as Providencia rettgeri showed the highest decolorization of a model dye, methyl red by 97% within 6 h using nutrient broth. Preferred redox mediator was found to be quinol (95% within 5 h) than other (nicotinamide adenine dinucleotide (NAD + ), reduced NAD + , nicotinamide adenine dinucleotide phosphate (NADP + ) and reduced NADP + ). In addition, the biodegradation of methyl red was investigated by subjecting its metabolites to UV-visible, highperformance liquid chromatography and Fourier transform infrared analyses that suggested the biodegradation. This was confirmed by the removal of signature peaks of aromatic C-H bending (645, 759 and 831 cm −1 ) and the N=N peak at 1509 cm −1 of the FTIR spectrum of the metabolites. In conclusion, introduction of minute amount of hydroquinone (1 mM) into wastewaters could enhance their biotreatment by this strain of P. rettgeri.

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Decolorization and Partial Degradation of Selected Azo Dyes by Methanogenic Sludge

Cited by 22 publications

References 9 publications

Kinetics of anaerobic biodecolourisation of azo dyes

Kinetics of anaerobic biodecolourisation of azo dyes

Decolorization of Azo Dyes by Immobilized Bacteria

Influence of redox mediators and media on methyl red decolorization and its biodegradation by Providencia rettgeri

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