Enzymatic decolorization and degradation of azo dyes – A review

Singh, Ram Lakhan; Singh, Pradeep Kumar; Singh, Rajat

doi:10.1016/j.ibiod.2015.04.027

Cited by 492 publications

(234 citation statements)

References 118 publications

(85 reference statements)

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“…The airlift bioreactor operation was optimized for dye 5 decolorization based on aeration rate representing the effect of oxygen in the bioreactor. 6 Results determined that the most efficient operation of this enzymatic dye decolorization 7 system was in aerobic conditions with copper alginate immobilized laccase of Ganoderma sp. KU-8 Alk4, using a 5 L airlift bioreactor with 4 L working volume of 25 mg/L dye effluent and 6 × 10 4 9 IU of immobilized laccase.…”

Section: Optimization Of Oxygen Transfer On Efficiency Of the Immobilmentioning

confidence: 99%

“…One protein was reported as a new laccase (Teerapatsakul et al, 2007a). 6 Immobilized enzyme was prepared from the crude enzyme described above in a copper 7 alginate bead. For optimal immobilization conditions, copper-alginate laccase was prepared with 8 3.6% w/v low mannuronate alginate and 0.15 M CuSO 4 following the statistical method of Latin 9 Square Design (Teerapatsakul et al, 2008).…”

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confidence: 99%

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Repeated batch for dye degradation in an airlift bioreactor by laccase entrapped in copper alginate

Teerapatsakul

Parra‐Saldívar

Keshavarz

et al. 2017

International Biodeterioration & Biodegradation

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Abstract16 A repeated batch of synthetic dye decolorization was efficiently demonstrated in a 5 L airlift 17 bioreactor. A laccase from Ganoderma sp. KU-Alk4, degrading commercial aromatic dyes was 18 selected. The crude enzyme extract expressed laccase activity, and was immobilized under optimal 19 conditions in copper-alginate beads, 3 IU/bead. The immobilized enzyme showed high efficiency 20 in degrading various synthetic dyes under non-buffered conditions, in particular the indigoid dye 21 Indigo Carmine. The immobilized laccase also showed marked increase in stability toward 22 temperature and pH when compared with free enzyme preparation. Immobilization enhanced its 23 temperature stability to maintain initial activity up to 55 °C, ten degrees higher than the free 24 enzyme. The immobilized laccase was stable in the alkaline region up to pH 10.0. The dye 25 decolorization system in 5 L airlift bioreactor was demonstrated with 25 mg/L Indigo Carmine 26 dissolved in tap water and a total immobilized laccase activity of 6x10 4 IU. Airflow rate was the 27 most important factor affecting the number of batch runs and the time for 100% dye degradation. 28 An optimal airflow rate was of 4 L/min. Fourteen batch runs of complete dye degradation were 29 successfully completed with only a single enzyme supplementation, and this could be a feasible 30 system for operation in industry. Total dye degraded by this repeated process at 4 L/min airflow 31 rate was 1.8 g. Isatin sulfonic acid was a metabolic product of Indigo Carmine degradation 32 catalyzed by the immobilized laccase. This development of an effective repeatable bioprocess 33 using enzymes for the treatment of dye-contaminated effluent has potential for implementation on 34 an industrial scale.

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Section: Optimization Of Oxygen Transfer On Efficiency Of the Immobilmentioning

confidence: 99%

mentioning

confidence: 99%

Repeated batch for dye degradation in an airlift bioreactor by laccase entrapped in copper alginate

Teerapatsakul

Parra‐Saldívar

Keshavarz

et al. 2017

International Biodeterioration & Biodegradation

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“…Concentration of 4-nitroaniline was 100 µmol L -1 Garg et al, 2012;Agrawal et al, 2013). Microbial degradation provides most promising possibility for complete mineralization of dyes and intermediates (aromatic amines), due to greater adaptability and increased rate of bacterial growth (Saratale et al, 2011;Singh et al, 2015). Reduction of azo bonds in anaerobic condition is the first step in the breakdown of azo dyes, forming aromatic amines (Pandey et al, 2007;Franciscon et al, 2009).…”

Section: Discussionmentioning

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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“…The dyes not only deteriorate aesthetic properties of water by imparting significant color but also increase the biological oxygen demand, chemical oxygen demand, and dissolved and suspended solids (Ahmad et al, 2015). Azo dyes are one of most concerned dyes because of their potentiality to induce carcinogenicity or mutagenicity in humans and animals (Ahmad et al, 2015;Singh et al, 2015;Moussavi and Mahmoudi, 2009). Emissions standards are becoming increasingly stringent for azo dyes pollution and they are must be removed to minimize the environmental impact.…”

Section: Introductionmentioning

confidence: 99%

“…Emissions standards are becoming increasingly stringent for azo dyes pollution and they are must be removed to minimize the environmental impact. Various processes and techniques have been developed for azo dyes removal from aqueous solution including adsorption (Goscianska et al, 2014(Goscianska et al, , 2015aYagub et al, 2014), chemical coagulation (Zahrim et al, 2011), photodegradation (Davies et al, 2005) and biodegradation (Singh et al, 2015). Among them, adsorption onto porous materials is considered to be one of the most efficient techniques for azo dyes removal from aqueous solution (Goscianska et al, 2014(Goscianska et al, , 2015aYagub et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Removal of azo dye by a highly graphitized and heteroatom doped carbon derived from fish waste: Adsorption equilibrium and kinetics

Liu

Zhang

Liu

et al. 2016

Journal of Environmental Management

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a b s t r a c tA highly graphitized and heteroatom doped porous carbon was prepared from fish waste in the present study. The morphology and chemical composition of the resultant porous carbon were characterized by SEM-EDS, TEM, BET, XRD and Raman measurement. The prepared porous carbon was employed as an adsorbent for acid orange 7, a typical azo dye, removal from aqueous solution. The results showed that the porous carbon had ultrahigh surface area of 2146 m 2 /g, a high degree of graphitization structure and naturally doped with nitrogen and phosphorous. The maximum adsorption capacity of acid orange 7 reached 285.71 mg/g due to unique property of the prepared porous carbon. In addition, acid orange 7 adsorption onto the porous carbon well followed pseudo-second-order kinetics model and acid orange 7 diffusion in micropores was the potential rate controlling step.

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Enzymatic decolorization and degradation of azo dyes – A review

Cited by 492 publications

References 118 publications

Repeated batch for dye degradation in an airlift bioreactor by laccase entrapped in copper alginate

Repeated batch for dye degradation in an airlift bioreactor by laccase entrapped in copper alginate

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

Removal of azo dye by a highly graphitized and heteroatom doped carbon derived from fish waste: Adsorption equilibrium and kinetics

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