Decolorization and detoxification of two textile industry effluents by the laccase/1-hydroxybenzotriazole system

Ouafa Benzina, Dalel DAÂSSI, Hela Zouari-Mechichi, Fakher Frikha, Steve Woodward, Lassaad Belbahri, Susana Rodriguez-Couto, Tahar Mechichi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The aim of this work was to determine the optimal conditions for the decolorization and the detoxification of two effluents from a textile industry—effluent A (the reactive dye bath Bezactive) and effluent B (the direct dye bath Tubantin)—using a laccase mediator system. Response surface methodology (RSM) was applied to optimize textile effluents decolorization. A Box–Behnken design using RSM with the four variables pH, effluent concentration, 1-hydroxybenzotriazole (HBT) concentration, and enzyme (laccase) concentration was used to determine correlations between the effects of these variables on the decolorization of the two effluents. The optimum conditions for pH and concentrations of HBT, effluent and laccase were 5, 1 mM, 50 % and 0.6 U/ml, respectively, for maximum decolorization of effluent A (68 %). For effluent B, optima were 4, 1 mM, 75 %, and 0.6 U/ml, respectively, for maximum decolorization of approximately 88 %. Both effluents were treated at 30 °C for 20 h. A quadratic model was obtained for each decolorization through this design. The experimental and predicted values were in good agreement and both models were highly significant. In addition, the toxicity of the two effluents was determined before and after laccase treatment using Saccharomyces cerevisiae, Bacillus cereus, and germination of tomato seeds.
Original languageEnglish
Pages (from-to)5177-5187
Number of pages11
JournalEnvironmental Science and Pollution Research
Volume20
Issue number8
Early online date30 Jan 2013
DOIs
Publication statusPublished - Aug 2013

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Textile Industry
Laccase
Detoxification
textile industry
Textile industry
detoxification
Effluents
effluent
Textiles
Baths
Coloring Agents
Bacillus cereus
Lycopersicon esculentum
Germination
Saccharomyces cerevisiae
Seeds
dye
Dyes
1-hydroxybenzotriazole
Enzymes

Keywords

  • laccase
  • textile effluents
  • Box-Behnken
  • decolorization
  • toxicity

Cite this

Decolorization and detoxification of two textile industry effluents by the laccase/1-hydroxybenzotriazole system. / Benzina, Ouafa; DAÂSSI, Dalel; Zouari-Mechichi, Hela; Frikha, Fakher; Woodward, Steve; Belbahri, Lassaad; Rodriguez-Couto, Susana; Mechichi, Tahar.

In: Environmental Science and Pollution Research , Vol. 20, No. 8, 08.2013, p. 5177-5187.

Research output: Contribution to journalArticle

Benzina, O, DAÂSSI, D, Zouari-Mechichi, H, Frikha, F, Woodward, S, Belbahri, L, Rodriguez-Couto, S & Mechichi, T 2013, 'Decolorization and detoxification of two textile industry effluents by the laccase/1-hydroxybenzotriazole system', Environmental Science and Pollution Research , vol. 20, no. 8, pp. 5177-5187. https://doi.org/10.1007/s11356-013-1491-6
Benzina, Ouafa ; DAÂSSI, Dalel ; Zouari-Mechichi, Hela ; Frikha, Fakher ; Woodward, Steve ; Belbahri, Lassaad ; Rodriguez-Couto, Susana ; Mechichi, Tahar. / Decolorization and detoxification of two textile industry effluents by the laccase/1-hydroxybenzotriazole system. In: Environmental Science and Pollution Research . 2013 ; Vol. 20, No. 8. pp. 5177-5187.
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AU - Frikha, Fakher

AU - Woodward, Steve

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AB - The aim of this work was to determine the optimal conditions for the decolorization and the detoxification of two effluents from a textile industry—effluent A (the reactive dye bath Bezactive) and effluent B (the direct dye bath Tubantin)—using a laccase mediator system. Response surface methodology (RSM) was applied to optimize textile effluents decolorization. A Box–Behnken design using RSM with the four variables pH, effluent concentration, 1-hydroxybenzotriazole (HBT) concentration, and enzyme (laccase) concentration was used to determine correlations between the effects of these variables on the decolorization of the two effluents. The optimum conditions for pH and concentrations of HBT, effluent and laccase were 5, 1 mM, 50 % and 0.6 U/ml, respectively, for maximum decolorization of effluent A (68 %). For effluent B, optima were 4, 1 mM, 75 %, and 0.6 U/ml, respectively, for maximum decolorization of approximately 88 %. Both effluents were treated at 30 °C for 20 h. A quadratic model was obtained for each decolorization through this design. The experimental and predicted values were in good agreement and both models were highly significant. In addition, the toxicity of the two effluents was determined before and after laccase treatment using Saccharomyces cerevisiae, Bacillus cereus, and germination of tomato seeds.

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