Combined anaerobic–aerobic treatment of azo dyes—A short review of bioreactor studies

Zee, Frank P. van der; Villaverde, S.

doi:10.1016/j.watres.2005.03.007

Cited by 680 publications

(296 citation statements)

References 97 publications

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“…Within the broad class of azo dyes, those that are produced from aromatic amines, including benzidine and 4-biphenylamine, 4-aminobiphenyl, monoacetylbenzidine and acetylaminobiphenyl, pose a particularly serious threat to the environment (Cerniglia et al, 1986;Chung, 2000). Nitroanilines are commonly generated during the biodegradation of azo dyes under anaerobic conditions (Khalid et al, 2009;van der Zee & Villaverde, 2005). Toxicity of these metabolic products also affects performance and ability of the dye decolorizing bacteria that are used for wastewater treatment.…”

Section: Aromatic Amines/intermediate-linked Toxicitymentioning

confidence: 99%

Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations

Ibekwe

Yang

et al. 2016

Science of The Total Environment

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Azo dyes and their intermediate degradation products are common contaminants of soil and groundwater in developing countries where textile and leather dye products are produced. The toxicity of azo dyes is primarily associated with their molecular structure, substitution groups and reactivity. To avoid contamination of natural resources and to minimize risk to human health, this wastewater requires treatment in an environmentally safe manner. This manuscript critically reviews biological treatment systems and the role of bacterial reductive and oxidative enzymes/processes in the bioremediation of dye-polluted wastewaters. Many studies have shown that a variety of culturable bacteria have efficient enzymatic systems that can carry out complete mineralization of dye chemicals and their metabolites (aromatic compounds) over a wide range of environmental conditions. Complete mineralization of azo dyes generally involves a two-step process requiring initial anaerobic treatment for decolorization, followed by an oxidative process that results in degradation of the toxic intermediates that are formed during the first step. Molecular studies have revealed that the first reductive process can be carried out by two classes of enzymes involving flavin-dependent and flavin-free azoreductases under anaerobic or low oxygen conditions. The second step that is carried out by oxidative enzymes that primarily involves broad specificity peroxidases, laccases and tyrosinases. This review focuses, in particular, on the characterization of these enzymes with respect to their enzyme kinetics and the environmental conditions that are necessary for bioreactor systems to treat azo dyes contained in wastewater.

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Section: Aromatic Amines/intermediate-linked Toxicitymentioning

confidence: 99%

Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations

Ibekwe

Yang

et al. 2016

Science of The Total Environment

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“…The configuration and operation of ABR are relatively simple over other anaerobic processes, such as the lack of liquid-gas separation devices, packing materials, and mechanical mixing (Metcalf, 2003). Despite of these advantages, ABR would not meet strict effluent standards for recalcitrant wastewater effluent, such as azo dye wastewater, especially at short hydraulic retention time (HRT) (Van der Zee and Villaverde, 2005). The volatile fatty acids (VFAs) produced from fermentation of organics in ABR, especially acetate, are normally poor electron donors for decolorization of azo dyes under anaerobic conditions (Dos Santos et al, 2005, 2007.…”

Section: Introductionmentioning

confidence: 99%

Enhanced decolorization of azo dye in a small pilot-scale anaerobic baffled reactor coupled with biocatalyzed electrolysis system (ABR–BES): A design suitable for scaling-up

Cui

Guo

Lee

et al. 2014

Bioresource Technology

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“…Thus it is evident that research must be directed towards sequential anaerobic/aerobic process [11,12] or identification of sequential biological-chemical processes that meet the following criteria: (i) non-specific with respect to their application to various types of water soluble reactive dyes and (ii) result in complete removal and decolourization of dyes under natural environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Decolourization of azo dyes using magnesium–palladium system

Patel¹,

Suresh²

2006

Journal of Hazardous Materials

117

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Combined anaerobic–aerobic treatment of azo dyes—A short review of bioreactor studies

Cited by 680 publications

References 97 publications

Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations

Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations

Enhanced decolorization of azo dye in a small pilot-scale anaerobic baffled reactor coupled with biocatalyzed electrolysis system (ABR–BES): A design suitable for scaling-up

Decolourization of azo dyes using magnesium–palladium system

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