Proposed pathways for the reduction of a reactive azo dye in an anaerobic fixed bed reactor

González-Gutiérrez, Linda V.; González‐Alatorre, Guillermo; Escamilla‐Silva, Eleazar M.

doi:10.1007/s11274-008-9906-0

Cited by 47 publications

(16 citation statements)

References 20 publications

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“…Carbon sources provide energy for the growth and survival of the microorganisms and as electron donors, which are necessary for the breakage of the azo bond. [ 33 ] These sources generate reducing equivalents which are transferred to the dye during decolorization process. In the electron transport chain of the bacterial metabolism these reducing equivalents such as flavin nucleotide (FAD) works as an electron shuttle between a dye and an NADH-dependent azo reductase.…”

Section: Resultsmentioning

confidence: 99%

Bacterial decolorization of textile azo dye acid orange by staphylococcus hominis RMLRT03

Singh

2014

Toxicol Int

140

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A bacterial strain RMLRT03 with ability to decolorize textile dye Acid Orange dye was isolated from textile effluent contaminated soil of Tanda, Ambedkar Nagar, Uttar Pradesh (India). The decolorization studies were performed in Bushnell and Haas medium (BHM) amended with Acid Orange dye. The bacterial strain was identified as Staphylococcus hominis on the basis of 16S rDNA sequence. The bacterial strain exhibited good decolorization ability with glucose and yeast extract supplementation as cosubstrate in static conditions. The optimal condition for the decolorization of Acid Orange dye by Staphylococcus hominis RMLRT03 strain were at pH 7.0 and 35°C in 60 h of incubation. The bacterial strain could tolerate high concentrations of Acid Orange dye up to 600 mg l-1. The high decolorizing activity under natural environmental conditions indicates that the bacterial strain has practical application in the treatment of dye containing wastewaters.

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Section: Resultsmentioning

confidence: 99%

Bacterial decolorization of textile azo dye acid orange by staphylococcus hominis RMLRT03

Singh

2014

Toxicol Int

140

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“…Degradation of pollutants and toxic compounds in the environment are mainly due microbial activities as shown in numerous reports such as the bioremediation of pesticides (Song et al 2005;Chatterjee et al 2010), diesel (Sadouk et al 2009;Moslemy et al 2002), azo dyes (Syed et al 2009;Revankar and Lele 2006;González-Gutiérrez et al 2009), heavy metals (Shukor et al 2010;Zhou et al 2007;Ozdemir et al 2005) and phenol derivatives (Sejákova et al 2009;Aguayo et al 2009;Machado et al 2005;Č ejková et al 2005). However, the growth of these microorganisms is inhibited at high concentrations of the xenobiotics, thus limiting the efficiency of the biodegradation of phenols (Prieto et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Enhanced phenol degradation by immobilized Acinetobacter sp. strain AQ5NOL 1

Ahmad

Shamaan

Arif

et al. 2011

World J Microbiol Biotechnol

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A locally isolated Acinetobacter sp. Strain AQ5NOL 1 was encapsulated in gellan gum and its ability to degrade phenol was compared with the free cells. Optimal phenol degradation was achieved at gellan gum concentration of 0.75% (w/v), bead size of 3 mm diameter (estimated surface area of 28.26 mm(2)) and bead number of 300 per 100 ml medium. At phenol concentration of 100 mg l(-1), both free and immobilized bacteria exhibited similar rates of phenol degradation but at higher phenol concentrations, the immobilized bacteria exhibited a higher rate of degradation of phenol. The immobilized cells completely degrade phenol within 108, 216 and 240 h at 1,100, 1,500 and 1,900 mg l(-1) phenol, respectively, whereas free cells took 240 h to completely degrade phenol at 1,100 mg l(-1). However, the free cells were unable to completely degrade phenol at higher concentrations. Overall, the rates of phenol degradation by both immobilized and free bacteria decreased gradually as the phenol concentration was increased. The immobilized cells showed no loss in phenol degrading activity after being used repeatedly for 45 cycles of 18 h cycle. However, phenol degrading activity of the immobilized bacteria experienced 10 and 38% losses after the 46 and 47th cycles, respectively. The study has shown an increased efficiency of phenol degradation when the cells are encapsulated in gellan gum.

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“…Therefore, the presence of heavy metals on immobilised cells was shown to have negative effect on caffeine degradation. Pollutants and toxic compounds degradation in the environment are mostly due microbial activities as shown in several reports for instance the bioremediation of heavy metals (Shukor et al, 2010), phenol derivatives (Aguayo et al, 2009;Seja´kova et al, 2009), diesel (Sadouk et al, 2009), azo dyes (Gonza´lez-Gutie´rrez et al, 2009;Syed et al, 2009;Revankar and Lele, 2006), and pesticides (Chatterjee et al, 2010). However, the growth of these organisms is inhibited at high concentrations of the toxic compounds which turn to be very toxic, thus limiting the effectiveness of the caffeine biodegradation.…”

Section: Results and Discussion Effect Of Heavy Metals On Caffeine-dementioning

confidence: 99%

Studies of action of heavy metals on caffeine degradation by immobilised <i>Leifsonia sp.</i> strain SIU

Ibrahim¹,

Muhammad²,

Tanko³

et al. 2016

Bayero J. Pure App. Sci.

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Caffeine is an important naturally occurring compound that can be degraded by bacteria. Excessive caffeine consumption is known to have some adverse problems. Previously, Leifsonia sp. strain SIU capable of degrading caffeine was isolated from agricultural soil. The bacterium was tested for its ability to degrade caffeine as the sole carbon and nitrogen source. The isolate was encapsulated in gellan gum and its ability to degrade caffeine in the presence of heavy metals was determined. Out of the nine heavy metals tested, Copper (Cu), Mercury (Hg), and Silver (Ag) had significant effects on caffeine degradation at 1mg/L. Therefore, the concentration of these heavy metals was varied from 0 -1 mg/L to see at what concentration each metal it has effect. Ag and Hg showed effect at 0.1 mg/L with caffeine degradation of 64.05 and 52.17% respectively, while Cu showed effect at 0.8 mg/L with caffeine degradation of 64.74%. These bacterium features make it an ultimate means for caffeine bioremediation. This is the first report of effect of heavy metals on caffeine degradation by immobilised Leifsonia sp. strain SIU.

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Proposed pathways for the reduction of a reactive azo dye in an anaerobic fixed bed reactor

Cited by 47 publications

References 20 publications

Bacterial decolorization of textile azo dye acid orange by staphylococcus hominis RMLRT03

Bacterial decolorization of textile azo dye acid orange by staphylococcus hominis RMLRT03

Enhanced phenol degradation by immobilized Acinetobacter sp. strain AQ5NOL 1

Studies of action of heavy metals on caffeine degradation by immobilised <i>Leifsonia sp.</i> strain SIU

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