Enzymatic Decolorization of Textile Dyeing Effluents

Abadulla, Elias; Robra, Karl‐Heinz; Gübitz, Georg; Silva, Luísa Mota da; Cavaco-Paulo, Artur

doi:10.1177/004051750007000506

Cited by 92 publications

(43 citation statements)

References 35 publications

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“…A utilização de outros fungos como por exemplo Pleorotus ostreatus e Trametes versicolor para degradação de corantes também vem sendo estudada [24][25][26][27] . Estes fungos caracterizam-se por serem bons produtores de lacase, uma fenol oxidase dependente de cobre.…”

Section: úTlimos Avanços No Tratamento De Corantes E Efluentes Têxteiunclassified

Novas tendências no tratamento de efluentes têxteis

Kunz¹,

Peralta‐Zamora²,

Moraes³

et al. 2002

Quím. Nova

317

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Recebido em 25/7/00; aceito em 6/6/01 NEW TENDENCIES ON TEXTILE EFFLUENT TREATMENT. Textile effluents, when not correctly treated, cause a high impact to the environment. The main recalcitrant compounds present in textile effluent are represented by the synthetic dyes, used during the fibber dying process. Among others, the azo dyes are considered the most harmful due to its mutagenic and carcinogenic character. In the present work we reported a revision study on the new tendencies for remediation of textile effluents, mainly to degrade the recalcitrant compounds. For this purpose, chemical, physical, photochemical, biological and combined processes were investigated.Keywords: textile effluents; treatment processes; recalcitrant compounds. INTRODUÇÃONas últimas décadas, os problemas ambientais têm se tornado cada vez mais críticos e freqüentes, principalmente devido ao desmedido crescimento populacional e ao aumento da atividade industrial. Com estes ingredientes os problemas devido a ação antrópica têm atingido dimensões catastróficas, podendo ser observadas através de alterações na qualidade do solo, ar e água.Sem dúvida, a contaminação de águas naturais tem sido um dos grandes problemas da sociedade moderna. A economia de água em processos produtivos vem ganhando especial atenção devido ao valor agregado que tem sido atribuído a este bem, através de princípios como consumidor pagador e poluidor pagador recentemente incorporados em nossa legislação. Aliado a isso, temos previsões não muito animadoras para o século que se inicia, como por exemplo a previsão feita pela Companhia de Saneamento do estado de São Paulo (SABESP), que estima que já em 2010 a demanda de água será superior a capacidade hídrica dos mananciais do estado 1 . Dentro deste contexto, o setor têxtil apresenta um especial destaque, devido a seu grande parque industrial instalado gerar grandes volumes de efluentes, os quais, quando não corretamente tratados, podem causar sérios problemas de contaminação ambiental.Os efluentes têxteis caracterizam-se por serem altamente coloridos, devido à presença de corantes que não se fixam na fibra durante o processo de tingimento 2 . A importância dos corantes para a civilização humana é evidente e bem documentada 3 . Os corantes sintéticos são extensivamente utilizados na indústria têxtil, gráfica, fotográfica e como aditivos em derivados de petróleo. Aproximadamente 10.000 diferentes corantes e pigmentos são usados industrialmente, o que representa um consumo anual de cerca de 7 x 10 5 tons no mundo 4-6 e 26.500 tons somente no Brasil 7 . A molécula do corante utilizada para tingimento da fibra têxtil pode ser dividida em duas partes principais, o grupo cromóforo e a estrutura responsável pela fixação à fibra.Existem vários grupos cromóforos utilizados atualmente na sín-tese de corantes. No entanto, o grupo mais representativo e largamente empregado pertence a família dos azocorantes (Figura 1), que se caracterizam por apresentarem um ou mais grupamentos -N=N-ligados a sistemas aromáticos. Os azocorantes r...

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Section: úTlimos Avanços No Tratamento De Corantes E Efluentes Têxteiunclassified

Novas tendências no tratamento de efluentes têxteis

Kunz¹,

Peralta‐Zamora²,

Moraes³

et al. 2002

Quím. Nova

317

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“…Evidently, Wengel et al (2006) demonstrated in a batch experiment that release of dissolved organic carbon from slates and charcoal was enhanced by the activity of the basidiomycete Schizophyllum commune. In general, S. commune is known to degrade polycyclic aromatic hydrocarbons (Matsubara et al, 2006), TNT (Bayman and Radkar, 1997) and textile dyes (Abadulla et al, 2000). Lignolytic fungi like S. commune create extracellular radical producing enzymes with very low substrate specificity that even degrade complex polymers like lignite and coal under aerobic conditions (Hofrichter et al, 1997a(Hofrichter et al, ,b, 1999.…”

Section: Introductionmentioning

confidence: 99%

Variable effects of labile carbon on the carbon use of different microbial groups in black slate degradation

Seifert¹,

Trumbore²,

Xu³

et al. 2011

Geochimica et Cosmochimica Acta

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Weathering of ancient organic matter contributes significantly to biogeochemical carbon cycles over geological times. The principle role of microorganisms in this process is well recognized. However, information is lacking on the contribution of individual groups of microorganisms and on the effect of labile carbon sources to the degradation process. Therefore, we investigated the contribution of fungi, Gram-positive and Gram-negative bacteria in the degradation process using a column experiment. Investigations were performed on low metamorphic black slates. All columns contained freshly crushed, sieved (0.63-2 mm), not autoclaved black slates. Two columns were inoculated with the lignite-degrading fungus Schizophyllum commune and received a culture medium containing 13 C labeled glucose, two columns received only this culture medium and two control columns received only water.The total mass balance was calculated from all carbon added to the slate and the CO 2 and DOC losses. Phospholipid fatty acids (PLFA) were extracted to investigate microbial communities. We used both the compound specific 14 C and 13 C signal of the PLFA to quantify carbon uptake from black slates and the glucose of the culture medium, respectively.The total carbon loss in these columns exceeded the amount of added carbon by approximately 60%, indicating that black slate carbon has been used. PLFA associated with Gram-positive bacteria dominated the indigenous community and took up 22% of carbon from black slate carbon, whereas PLFA of Gram-negative bacteria used only 8% of carbon from the slates. PLFA of Gram-negative bacteria and fungi were both mostly activated by the glucose addition. The added Schizophyllum did not establish well in the columns and was overgrown by the indigenous microbial community. Our results suggest that especially Gram-positive bacteria are able to live on and degrade black slate material. They also benefit from easy degradable carbon from the nutrient broth. In natural environments priming due to root exudates might consequently enhance weathering.

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“…By means of enzymatic catalyzed oxidative reactions, laccase can detoxify phenolic contaminants, such as aromatic amines, to harmless/less harmful products [10]. The suitability of laccases for such processes has been known for some time [11] and successful results achieved have been well documented by our group [12] and others [13,14]. These being of primary importance to the textile industry, dyes and dyestuffs are commonly used in the pharmaceutical, food, cosmetic and leather industries.…”

Section: Introductionmentioning

confidence: 99%

An acid-stable laccase from Sclerotium rolfsii with potential for wool dye decolourization

Ryan

Schnitzhofer

Tzanov

et al. 2003

Enzyme and Microbial Technology

108

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The plant pathogen basidiomycete S. rolfsii secretes two laccases (SRL1 and SRL2) with molecular weights of 55 and 86 kDa, respectively. Laccase production was shown to be inducible by the addition of 2,5-xylidine to the cultural media. After treatment with a combination of chitinase and ␤-1,3-glucanase, two different laccases were isolated from the sclerotia depending on the stage of sclerotia development.The more prominent laccase, SRL1, was purified and found to decolourize the industrially important wool azo dye Diamond Black PV 200 without the addition of redox mediators. The enzyme (pI 5.2) was active in the acidic pH range, showing an optimal activity at pH 2.4, with ABTS as substrate. The optimum temperature for activity was determined to be 62 • C. Enzyme stability studies revealed that SRL1 was notably stable at 18 • C and pH 4.5, retaining almost full activity after a week. Oxidation of tyrosine was not detectable under the reaction conditions but the enzyme did oxidize a variety of the usual laccase substrates. SRL1 was strongly inhibited by sodium azide and fluoride. Dye solutions decolourized with the immobilized laccase were successfully used for redyeing.

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Enzymatic Decolorization of Textile Dyeing Effluents

Cited by 92 publications

References 35 publications

Novas tendências no tratamento de efluentes têxteis

Novas tendências no tratamento de efluentes têxteis

Variable effects of labile carbon on the carbon use of different microbial groups in black slate degradation

An acid-stable laccase from Sclerotium rolfsii with potential for wool dye decolourization

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