Simultaneous anaerobic and aerobic degradation of the sulfonated azo dye Mordant Yellow 3 by immobilized cells from a naphthalenesulfonate-degrading mixed culture

Kudlich, Michael; Bishop, Paul L.; Knackmuss, Hans‐Joachim; Stolz, A.

doi:10.1007/s002530050867

Cited by 90 publications

(32 citation statements)

References 31 publications

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“…Immobilized cell methods can be divided mainly into two groups: the binding method (Blanco et al, 1995;Mulcahy and Shieh, 1987) and the entrapping method (Hashimoto and Furukawa, 1987;Chen and Lin, 1994;Kudlich et al, 1996). In our previous study, a mixed culture having a high capacity for rapid decolorization of azo dye was immobilized by a phosphorylated polyvinyl alcohol (PVA) gel (Chen et al, 2003b).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic characteristics of immobilized cell beads in a liquid–solid fluidized‐bed bioreactor

Wu¹,

Chen²,

Chen³

et al. 2003

Biotech & Bioengineering

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This study examined the hydrodynamic characteristics of a liquid-solid fluidized-bed bioreactor using elastic particles (PVA gel beads) of various diameters as carriers. The drag coefficient-Reynolds number, velocity-voidage, and expansion index-Reynolds number relationships observed during fluidization of PVA gel beads in a fluidized bed in our experiments were compared with the published results. Predictions made from previous correlations were examined with our new experimental findings, revealing the inadequacy of most of these correlations. Thus, new correlations describing the above-mentioned relationships are suggested. The drag coefficient of immobilized cell beads is larger than that of free cell ones at the same Reynolds number because the surface of the immobilized cell beads is rougher. For multiparticle systems, the correction factor, f(epsilon), is a function of the falling gel bead properties (Reynolds number) as well as the fluidized gel bead properties (Archimedes number), and depend strongly on the bed voidage (epsilon). A new simple relation was developed to predict easily the epsilon value from 0.5-0.9 at 4,986 < A(r) < 40,745 or 34 < Re(t) < 186. For all the immobilized cell beads used in this study, the prediction error of the bed voidage was less than 5% at epsilon > 0.5. The prediction equations in this study can be further applied to analyzing the hydrodynamic characteristics of a fluidized-bed reactor using similar entrapped elastic particles as carriers.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic characteristics of immobilized cell beads in a liquid–solid fluidized‐bed bioreactor

Wu¹,

Chen²,

Chen³

et al. 2003

Biotech & Bioengineering

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“…Different extradiol dioxygenases from this strain have also been studied (Heiss et al, 1995(Heiss et al, , 1997Riegert et al, 1998). A. Stolz and others has been used in an anaerobic\aerobic process for the mineralization of sulfonated azo compounds (Haug et al, 1991 ;Keck et al, 1997 ;Kudlich et al, 1996Kudlich et al, , 1997. During a comparative study with different Sphingomonas strains, Nohynek et al (1996) demonstrated that strain BN6 T belongs to the genus Sphingomonas, according to its 16S rRNA gene sequence.…”

Section: Introductionmentioning

confidence: 99%

Description of Sphingomonas xenophaga sp. nov. for strains BN6T and N,N which degrade xenobiotic aromatic compounds.

Stolz¹,

Schmidt-Maag²,

Denner³

et al. 2000

International Journal of Systematic and Evolutionary Microbiology

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The taxonomic position of two bacterial strains, BN6 T and N,N, with the ability to degrade xenobiotic aromatic compounds (naphthalenesulfonates or N,Ndimethylaniline) was investigated. The 16S rRNA gene sequence, the GMC content of the DNA (62-63 mol %) and the detection of ubiquinone Q-10, 2-hydroxymyristic acid and the sphingoglycolipid present clearly placed the two strains into the genus Sphingomonas. Both strains are representatives of one species according to the level of DNA relatedness (707 %). The strains could be separated from all validly described taxa of the genus Sphingomonas, according to the 16S rRNA gene sequence (the highest sequence similarity observed was 96 % to Sphingomonas yanoikuyae), the pattern of the polar lipids and physiological characteristics. Therefore, the new species Sphingomonas xenophaga is proposed to accommodate strains BN6 T (l DSM 6383 T ) and N,N (l DSM 8566).

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“…Biological processes applied for decolorization of textile effluents are based on anaerobic and aerobic treatment. While anaerobic treatment provides reductive cleavage of the dyes' azo bond, aerobic treatment of azo dyes has been proven ineffective in most cases, but is often the typical method of treatment used today [4][5][6][7][8]. Though anaerobic treatment removes the color of the dye, aromatic amines resulting from decolorization process in the anaerobic treatment are not mineralized under anaerobic conditions and tend to accumulate to toxic levels [7,9].…”

Section: Introductionmentioning

confidence: 99%

“…To remove the breakdown products of dyes from the wastewater, it has been frequently reported that aerobic conditions are essential in which many aromatic amines are readily further mineralized as well as remaining COD. Combination of anaerobic and aerobic conditions is therefore the most convenient concept for treating colored wastewaters [6,8,[11][12][13]. So far, so many reactor types have been used to provide effective treatment for textile wastewaters, such as fluidized bed, upflow anaerobic sludge blanket reactors, and packed bed reactors.…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of Azo Dyes in Anaerobic–Aerobic Sequencing Batch Reactors

Çınar

Demiröz

2010

The Handbook of Environmental Chemistry

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Effluent discharge from textile and dyestuff industries to neighboring water bodies is currently causing significant health concerns to environmental regulatory agencies due to the toxicity, mutagenicity, and carcinogenicity of the dyes and their breakdown products. Therefore, considerable attention has been given to evaluate the removal of dyes during wastewater treatment and in the natural environment. The most widely used dyes in industries are azo dyes, which require an anaerobic and aerobic phases for their complete biodegradation. Anaerobic stage is the first step of the treatment process in which azo dyes are reduced, resulting in toxic and colorless aromatic amines. Since breakdown products of azo dyes, which are formed when the azo bond is cleaved and color is removed, are resistant to anaerobic biodegradation, aerobic phase is therefore essential for complete biodegradation of colored effluents. Biological treatment has long been known, and the use of sequencing batch reactors (SBRs) for treating textile wastewater has attracted interest. The cyclic operations of SBR provide both color removal in anaerobic stage and aromatic amine removal in aerobic stage.

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Simultaneous anaerobic and aerobic degradation of the sulfonated azo dye Mordant Yellow 3 by immobilized cells from a naphthalenesulfonate-degrading mixed culture

Cited by 90 publications

References 31 publications

Hydrodynamic characteristics of immobilized cell beads in a liquid–solid fluidized‐bed bioreactor

Hydrodynamic characteristics of immobilized cell beads in a liquid–solid fluidized‐bed bioreactor

Description of Sphingomonas xenophaga sp. nov. for strains BN6T and N,N which degrade xenobiotic aromatic compounds.

Biodegradation of Azo Dyes in Anaerobic–Aerobic Sequencing Batch Reactors

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