Microbial decolouration of azo dyes: A review

Solís, María Eugenia Ramírez; Solı́s, Aida; Pérez, Herminia I.; Manjarrez, Norberto; Flores, María Elena Serrano

doi:10.1016/j.procbio.2012.08.014

Cited by 739 publications

(385 citation statements)

References 312 publications

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“…Azo compounds with a hydroxyl or amino groups are more likely to be degraded than those with methyl, methoxy, sulpho, or nitro groups (Supaka et al 2004). It has been reported that dyes with simple structures and low molecular weights exhibit higher rates of decolourization than those with high molecular weight and high substitutions (Solis et al 2012;Da Silva et al 2012 The lesser decolourization of RB5 was attributed to its high molecular weight and highly substituted chemical structure as compared to that of CR (see Fig. 1).…”

Section: Dye Structurementioning

confidence: 94%

“…Aromatic amines formed from azo dye reduction have been reported to be resistant to anaerobic biodegradation and partially or completely biodegradable under aerobic conditions (Libra et al 2004;Sponza and Isik 2005;Koupaie et al 2011;Supaka et al 2004;Ali 2010;Shaw et al 2002). The decrease or disappearance of the peaks or shifting towards the lower retention time in the HPLC chromatograms, the decrease or disappearance of aromatic amines as detected by diazotization method, as well as the decrease in UV absorbance; all indicate removal of aromatic amines (Solis et al 2012). The decrease in toxicity in the effluent of aerobic stage as compared to that with the effluent of anaerobic stage may also provide indirect evidence of degradation of aromatic amines .…”

Section: Toxicity At Various Stages Of Anaerobic-aerobic Biodegradationmentioning

confidence: 99%

“…The effectiveness of microbial decolourization depends on the adaptability and activity of the selected micro-organisms (Adinew 2012). A complete review on degradation of dyes by various micro-organisms has been published in recent years (Saratale et al 2011;Solis et al 2012;Chengalroyen and Dabbs 2013). As compared to pure microbial cultures which are vulnerable to contamination, mixed microbial cultures, such as anaerobic granular sludge or aerobic activated sludge, have more applicability in actual field conditions for wastewater treatment.…”

Section: Decolourization Of Dyes: Pure Versus Mixed Microbial Culturesmentioning

confidence: 99%

“…On the other hand, the aromatic amines are degraded aerobically via hydroxylation, and ring cleavage by oxidative enzymes such as peroxidase, laccase, phenoloxidase (Rauf and Salman Ashraf 2012). Laccases have potential in bioremediation due to their non-specific oxidation capacity, lack of a requirement of co-factors, and use of readily available oxygen as an electron acceptor (Solis et al 2012). The ability of micro-organisms to utilize the amines as the sole source of carbon and nitrogen needs to be checked.…”

Section: Toxicity At Various Stages Of Anaerobic-aerobic Biodegradationmentioning

confidence: 99%

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Destruction of azo dyes by anaerobic–aerobic sequential biological treatment: a review

Popli

Patel

2014

Int. J. Environ. Sci. Technol.

254

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Dyes are synthetic organic compounds widely used in various industries such as, textile, leather, plastic, food, pharmaceutical, and paints manufacturing industries. Coloured effluents are highly toxic to the aquatic life and mutagenic to humans. Wastewater containing dyes has become an important issue demanding serious attention. Among the synthetic dyes, azo dyes are the largest and most widely used dyes and account for more than half of the annually produced dyes. The biodegradation of azo dyes is difficult due to their complex structure and synthetic nature. Several treatments have been proposed for efficient azo dye removal, most of them presenting some limitations such as generation of waste sludge, high operational costs, poor efficiency, and incomplete mineralization. Biological treatment is a cost-effective and eco-friendly process for dye degradation. Sequential anaerobic-aerobic biological treatment is considered as one of the most cost-effective methods for the complete mineralization of azo dyes. The anaerobic stage yields decolourization through reductive cleavage of the dye's azo linkages, resulting in the formation of generally colourless but potentially hazardous aromatic amines. The aerobic stage involves degradation of the aromatic amines. It is the most logical step for removing the azo dyes from the wastewater. Several factors can influence the microbial activity and consequently the efficacy and effectiveness of the complete biodegradation processes. This paper summarizes the results of biological decolourization of azo dyes using various types of reactors, elaborates biochemical mechanisms involved, and discusses influence of various operational parameters on decolourization based on reports published in the last decade.

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Section: Dye Structurementioning

confidence: 94%

Section: Toxicity At Various Stages Of Anaerobic-aerobic Biodegradationmentioning

confidence: 99%

Section: Decolourization Of Dyes: Pure Versus Mixed Microbial Culturesmentioning

confidence: 99%

Section: Toxicity At Various Stages Of Anaerobic-aerobic Biodegradationmentioning

confidence: 99%

See 2 more Smart Citations

Destruction of azo dyes by anaerobic–aerobic sequential biological treatment: a review

Popli

Patel

2014

Int. J. Environ. Sci. Technol.

254

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“…Wastewater resulting from these processes have an opposite impact in terms of Total Organic Carbon (TOC), hanged up solids, salt level, color in a wide range of pH and organic recalcitrant compound such as colorants "azo". The relation DBO/DQO in the rank between 0.2 to 0.5 indicates that these affluents have a great amount of organic material non biodegradable (1). Though pigments or colorific make the world glower, at the same time it is a serious problem both biological and aesthetical as well, because of water coloration and changes or stopping photosynthesis process in the water ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Decoloración de aguas residuales de una industria de pinturas por la microalga Chlorella sp

et al. 2017

Rev MVZ Córdoba

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Objective. Decoloring wastewater from a paint factory making use of Chlorella sp., microalgae as a biological way of treatment. Materials and methods. Samples of this microalgae previously cultivated with nourishing fertilizer under photoperiods of light and darkness were taken to test the microalgae Chlorella sp., initial concentration effect in the bioremoval process. For this purpose, it was cultivated in 0.10, 0.20 and 0.30 units of absorbance in bioreactors with 200 mL wastewater with and without nutrients. The biotest with the best rate of colour removal was chosen and the DBO5 and DQO were marked out. The immobilized Chlorella sp., in kappa carrageenan was also tested. Results. In the tests colour decrease percentage were 81.7, 69.7 and 58.3% without nutrients in the initial concentrations of 0.10, 0.20 and 0.30 units of absorbance respectively and 72.6, 69.0 and 86.8% for 0.10, 0.20 and 0.30 units of absorbance with nutrients respectively in the day of maximum growth. The immobilized microalgae score were 72.60% and 78.36% of color removal for 0.4 and 1.6 units of absorbance respectively. The higher colour removal test score was that with nutrients at 0.30 units of absorbance with several changes in DBO5 and DQO values. Conclusion. The biological wastewater treatment making use of Chlorella sp., microalgae can be considered as an effective choice in decolorating wastewater.

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Non‐Conventional Adsorbents for Dye Removal

Crini¹

2015

Green Chemistry for Dyes Removal From Wastewater

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Microbial decolouration of azo dyes: A review

Cited by 739 publications

References 312 publications

Destruction of azo dyes by anaerobic–aerobic sequential biological treatment: a review

Destruction of azo dyes by anaerobic–aerobic sequential biological treatment: a review

Decoloración de aguas residuales de una industria de pinturas por la microalga Chlorella sp

Non‐Conventional Adsorbents for Dye Removal

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