Azo dye decolourisation by anaerobic granular sludge

Zee, Frank P. van der; Lettinga, G.; Field, Jim A.

doi:10.1016/s0045-6535(00)00270-8

Cited by 287 publications

(113 citation statements)

References 26 publications

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“…Removal of pollutants from the environment by biological methods has significant advantages over other methods because of the adaptability of various micro-organisms in degrading various compounds. Azo dyes can undergo biological degradation under both aerobic and anaerobic conditions (Vanderzee et al 2001). This paper reviews various biological systems for decolourization of azo dyes using mixed microbial culture and various types of laboratory scale reactors.…”

Section: Decolourization and Degradation Of Dyes By Various Methodsmentioning

confidence: 99%

“…Different reactor configurations, such as the widely used upflow anaerobic sludge blanket (UASB), expanded granular sludge bed (EGSB), anaerobic/aerobic sequential batch reactor (SBR), activated sludge process (ASP), have been reported for efficient dye decolourization using mixed microbial consortia (Dos Santos et al 2007;Karatas et al 2010;Yasar et al 2012;Da Silva et al 2012). The biodegradation of azo dyes occurs in a two-step process (Rai et al 2005;Vanderzee et al 2001). Azo linkages are easily reduced under anaerobic condition, yielding colourless aromatic amines, which are further degraded aerobically (Barraga et al 2007).…”

Section: Decolourization Of Dyes: Pure Versus Mixed Microbial Culturesmentioning

confidence: 99%

“…The most important point to be emphasized is availability of the electron acceptors in the anaerobic phase. As the anaerobic colour removal occurs by reduction of the azo dye which acts as final electron acceptor in the microbial electron transport chain, the presence of alternative electron acceptors in anaerobic zone can become a rate-controlling factor for the dye decolourization (Vanderzee et al 2001). The electronaccepting process depends on the redox potential difference between the electron donor and electron acceptor (Dos Santos et al 2007).…”

Section: Alternative Electron Acceptor (And Redox Mediator)mentioning

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.

257

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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: Decolourization and Degradation Of Dyes By Various Methodsmentioning

confidence: 99%

Section: Decolourization Of Dyes: Pure Versus Mixed Microbial Culturesmentioning

confidence: 99%

Section: Alternative Electron Acceptor (And Redox Mediator)mentioning

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.

257

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“…Regarding the extraordinary complex character of this matter it implies that a lot of long-term, very well coordinated multidisciplinary research activities need to be initiated. Use of electron and redox mediators Compounds like humic acids, activated-carbon, quinones, e.g., anthraquinone disulfonate (AQDS), anthraquinone-2-sulphonate (AQS) catalyze the anaerobic degradation reactions of numerous recalcitrant compounds; they facilitate electron transport in the degradation of, e.g., azo dyes [79][80][81][82][83][84][85][86][87], and reductive de-halogenation [88]. However, as with the issue of 'trace elements' in this particular field, a better understanding is required which will lead to a wider and more optimal application of AnWT.…”

Section: Mixing Conditionsmentioning

confidence: 99%

Challenges of a feasible route towards sustainability in environmental protection

Lettinga

2010

Front. Environ. Sci. Eng. China

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Anaerobic processes for treatment of low and high strength wastewaters and solid wastes constitute the core method in the natural biological mineralization (NBM) treatment concept. When adequately combined with the complementary NBM-systems and modern clean water saving practices in wastewater collection and transport, they represent a feasible route to sustainable environmental protection (EP sus ), in essence even towards a more sustainable society. Despite the development and implementation of modern high rate Anaerobic Wastewater Treatment (AnWT-) systems and complementary innovative NBM-processes, the considerable progress made since the seventies in fundamental insights in microbiology, biochemistry and process technology, still numerous challenging improvements in the NBM-field can be realized. This contribution is mainly based on the insights attained from wide ranging literature evaluations and the results of experimental research conducted by numerous PhD students who participated in our group over the last four decades. An attempt is made here to identify major facets on which an improved insight can, and consequently should, be obtained in order to accomplish more optimal operation and design of various types of Anaerobic Degradation (AnDeg-) processes.

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“…On the other hand, biological treatment of dyed-waters can be cheaper than physicochemical treatment. [9][10][11] The decolourisation of dyes under anaerobic conditions is based on electrons transfer from a substrate (electron donor oxidized by the microorganisms) to the dye (final electron acceptor), thus promoting the reductive cleavage of the dye chromophore. 5 The anaerobic process to remove dye is insufficient to mineralize the degradation products of dyes, so it is necessary a post-treatment for anaerobic effluent.…”

Section: Introductionmentioning

confidence: 99%

Effect of dye structure and redox mediators on anaerobic azo and anthraquinone dye reduction

Costa¹,

Mota²,

Santos³

et al. 2012

Quím. Nova

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Recebido em 1/4/11; aceito em 30/9/11; publicado na web em 6/12/11We investigated the biological decolourisation of dyes with different molecular structures. The kinetic constant values (k 1 ) achieved with azo dye Reactive Red 120 were 7.6 and 10.1 times higher in the presence of RM (redox mediators) AQDS and riboflavin, respectively, than the assays lacking RM. The kinetic constant achieved with the azo dye Congo Red was 42 times higher than that obtained with the anthraquinone dye Reactive Blue 4. The effect of RM on dye reduction was more evident for azo dyes resistant to reductive processes, and ineffective for anthraquinone dyes because of the structural stability of the latter.

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Azo dye decolourisation by anaerobic granular sludge

Cited by 287 publications

References 26 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

Challenges of a feasible route towards sustainability in environmental protection

Effect of dye structure and redox mediators on anaerobic azo and anthraquinone dye reduction

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