Optimization of conditions for decolorization of azo-based textile dyes by multiple fungal species

El‐Rahim, Wafaa M. Abd; Moawad, Hassan; Azeiz, Ahmed Z. Abdel; Sadowsky, Michael J.

doi:10.1016/j.jbiotec.2017.08.022

Cited by 61 publications

(20 citation statements)

References 18 publications

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“…A concentração de proteínas solúveis aumentou até 8 h de cultivo e depois diminuiu de forma constante até se esgotar, após 20 h (Figura 2). Os valores de pH caíram de 6 para cerca de 4, após 16 h, mantendo-se até o fim do processo, provavelmente em virtude da produção de ácidos orgânicos durante o metabolismo da glicose (CHEN et al, 2003;EL-RAHIM et al, 2017). Yang et al (2005) atribuíram a diminuição do pH à produção de ácidos e à liberação dos grupos SO 3 do corante, durante a descoloração PR5 pela levedura Debaryomyces polymorphus.…”

Section: Ensaio De Otimizaçãounclassified

“…Os corantes são substâncias coloridas que, quando aplicadas a fibras, produzem coloração permanente capaz de resistir à exposição a agentes químicos e físicos e que têm diversas aplicações na indústria de cosméticos, alimentos, plásticos e têxtil. No entanto, o descarte desses efluentes pelas indústrias resulta na contaminação de mananciais, visto que a maioria dos corantes sintéticos apresenta baixa degradabilidade, são xenobiontes e recalcitrantes, além de mutagênicos e carcinogênicos (SARATALE et al, 2011;PEIXOTO;MARINHO;RODRIGUES, 2013;EL-RAHIM et al, 2017). Entre esses corantes, o Preto Reativo 5 é muito utilizado na indústria têxtil para o tingimento de lã, fibras sintéticas e algodão, em função de sua aplicação simples e de elevada fixação (KHAN; BHAWANA; FULEKAR, 2013; VENTURA-CAMARGO; MARIN-MORALES, 2013).…”

Section: Introductionunclassified

“…Entre esses corantes, o Preto Reativo 5 é muito utilizado na indústria têxtil para o tingimento de lã, fibras sintéticas e algodão, em função de sua aplicação simples e de elevada fixação (KHAN; BHAWANA; FULEKAR, 2013; VENTURA-CAMARGO; MARIN-MORALES, 2013). DOI: 10.1590 Os métodos químicos e físicos continuam sendo os principais procedimentos usados no tratamento de efluentes têxteis, mas, apesar de eficientes, são dispendiosos e muitas vezes resultam na produção de poluentes secundários (EL-RAHIM et al, 2017). O tratamento microbiano, por sua vez, é uma alternativa promissora e de baixo custo, além de apresentar versatilidade, adaptabilidade e ser ambientalmente mais seguro (TAN et al, 2014;MAHMOUD, 2016).…”

Section: Introductionunclassified

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Levedura Pichia kudriavzevii SD5 como biocatalizador na descoloração do corante Preto Reativo 5

Delane

Evangelista-Barreto

Cazetta

2020

Eng. Sanit. Ambient.

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RESUMO As leveduras vêm apresentando bons resultados na biodegradação de corantes, tornando-se uma alternativa ambientalmente segura e de custo mais baixo para o tratamento de efluentes contendo corantes industriais. Assim, o objetivo deste trabalho foi estudar a descoloração do azo corante Preto Reativo 5 (PR5) pela levedura Pichia kudriavzevii SD5. Para otimização dos parâmetros de descoloração do Preto Reativo 5 foram realizados dois planejamentos experimentais do tipo Delineamento Composto Central Rotacional (DCCR) 23, sendo cada planejamento composto por 17 ensaios, a 150 rpm durante 24 h. As variáveis estudadas foram pH, temperatura e concentração do corante e tiveram como resposta a porcentagem de descoloração. Também foram realizados testes de toxicidade do sobrenadante após 16 h e 24 h de cultivo, utilizando-se sementes de alface (Lactuca sativa) e o microcrustáceo Artemia salina. Os resultados mostraram que a P. kudriavzevii SD5 é uma levedura tolerante a vários tipos de estresse, uma vez que apresentou capacidade de degradar elevadas concentrações do corante PR5 a 45° C. Entretanto, apenas a temperatura apresentou influência estatisticamente significativa (p < 0,05) na descoloração do PR5. Os bioensaios de toxicidade demonstraram que ocorreu diminuição da toxicidade após 24 h de cultivo, e o perfil de absorbância do sobrenadante apontou para um mecanismo degradativo de descoloração.

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Section: Ensaio De Otimizaçãounclassified

Section: Introductionunclassified

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Levedura Pichia kudriavzevii SD5 como biocatalizador na descoloração do corante Preto Reativo 5

Delane

Evangelista-Barreto

Cazetta

2020

Eng. Sanit. Ambient.

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“…However, degradation of dyes in TWWs by white-rot fungi has some intrinsic drawbacks like the long growth phase and the requirement of nitrogen restrictive environments, unreliable enzyme production and large reactor size due to the long holding time for complete degradation. 7,14,56 Multiple fungal species, particulary the genus Aspergillus described by 57 are able to decolorize a large number of dyes. This genus was also reported by.…”

Section: Pure Culturementioning

confidence: 99%

Untitled

2019

JTEFT

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Textile dyeing industries are facing problems to meet the green practices standards for safe discharge of wastewater due to its complex nature. TWWs are a complex mixture of salts, acids, heavy metals, organ-chlorine-based pesticides, pigments and dyes. 5,10 TWWs generated from the different wet processes are characterized by high pH, temperature, BOD, COD, detergents, surfactants, suspended and dissolved solids, dispersants, leveling agents, toxic organics, chlorinated compounds, sulphide and formaldehyde, may be added to improve dye adsorption onto the fibers 9 and more details are mentioned in the Figure 1. Such effluents are also characterized by the presence of heavy metals, such as Cr, Zn, Cu and Al due to metal-based complexes dyes. 10,14 The most common textile operates are desizing, bleaching, mercerizing, dyeing and finishing. 15 Characteristics and the amount of TWWs depend to the process, dyeing is the most one which requires large volumes of water not only in the step of adding color to the fibers, in dye bath, but also during the rinsing step. Mercerizing and finishing are also significant generators of TWWs. In addition, equipment, machines and chemicals, 5 such as detergents and stabilizers, alter significantly the nature of TWWs. Another important factor which contributes to the ecotoxicity and the volume of TWWs is that dyeing and finishing processes, especially, require the imput of a wide range of dyestuffs. The Variety of dyes depends to the fiber used. 16 For example, cellulose fiber requires the application of direct, reactive, vat, azo or sulfide dyes. Acid dyes are used essentially for wool and silk. Azo and disperse dyes are applied to the polyester fiber. A large quantity of these dyes is released in the TWWs due to their degree of fixation to fibers. AbstractThe textile wastewaters (TWWs) are one of the major sources of environmental pollution, due to the presence of various recalcitrant dyes. It is estimated that about 300,000 t of synthetic dyes are discharged in TWWs every year worldwide. Thus, untreated or incompletely treated TWWs cause harm to aquatic and terrestrial life. To avoid the negative impacts associated to the discharge of TWWs into the natural ecosystems, effective dye remediation processes are being developed. Current methods of removing dyes from TWWs are generally regarded to be complex, expensive and energy demanding processes. Therefore, bioremediation of TWWs using microbial consortia has appeared as an emerging alternative for textile dyes removal. This chapter provides an updated literature on the application of microbial consortia in the treatment of TWWs, focusing on the mechanisms involved in dye biodegradation and the main interactions established between the consortia members and how they can influence dye removal efficiencies.

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“…It has been applied to remove organic compounds and the colour of textile effluents, due to their low cost, simple operation and maintenance [2,3,9]. Bacteria are performing most of the degradation in the treatment; however, fungi are also found associated in the consortia [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of two different carriers in the biodegradation process of an azo dye

Santos-Pereira

Corso

Forss

2019

J Environ Health Sci Engineer

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Purpose The MBBR solution has been applied for the textile wastewater treatment. However, in order to develop cost-effective solutions, waste biomass can be used as carrier. Rice husks are agricultural waste which have been used as an adsorbent of dyes; besides, they can provide and sustain suitable microorganism communities for the degradation of dyes. This study aimed to evaluate the biodegradation of the azo dye Direct Red 75 in two treatment systems with different carriers. Methods Bioreactor A was composed by an anaerobic bioreactor filled with Kaldnes K1 carriers employed in the MBBR technology and the study was performed in 2 different temperatures, 30 ± 0.5°C and 21 ± 2°C. Biofilter B was composed by a sequenced anaerobic-aerobic system with rice husks as carriers and this study was performed at 21 ± 2°C. The rice husks was also employed as a source of microorganisms in both systems. Decolourization, surface area of the carriers and other parameters were analysed. Results Biofilter B showed high rates of decolorization, mainly over 90% in all HRT tested (24, 48 and 12 h), presenting itself as a stable system, whereas Bioreactors A showed better performances with 48 h of HRT, about 85% for A at 30 ± 0.5°C and 45% at 21 ± 2°C. With a similar amount of carriers, analyses showed that rice husks had a much larger surface for microorganisms to grow on than Kaldnes K1. Conclusion The Biofilter B is a worthwhile system to be investigated and applied for the decolourization of textile wastewater treatment; for instance, in developing countries.

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Optimization of conditions for decolorization of azo-based textile dyes by multiple fungal species

Cited by 61 publications

References 18 publications

Levedura Pichia kudriavzevii SD5 como biocatalizador na descoloração do corante Preto Reativo 5

Levedura Pichia kudriavzevii SD5 como biocatalizador na descoloração do corante Preto Reativo 5

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Evaluation of two different carriers in the biodegradation process of an azo dye

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