NDLI: Influence of treatment conditions on the oxidation of micropollutants by Trametes versicolor laccase.

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Influence of treatment conditions on the oxidation of micropollutants by Trametes versicolor laccase.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Margot, Jonas Maillard, Julien Rossi, Luca Barry, D. A. Holliger, Christof
Description	Author Affiliation: Margot J ( Ecological Engineering Laboratory, School of Architecture, Civil and Environmental Engineering (ENAC), Station 2, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland)
Abstract	Many organic compounds present at low concentrations in municipal wastewater, such as various pharmaceuticals and biocides, are recalcitrant in conventional wastewater treatment plants (WWTPs). To improve their biodegradation, oxidoreductase enzymes such as laccases were tested. The goal was to find optimal conditions for the transformation of two anti-inflammatory pharmaceuticals (diclofenac (DFC) and mefenamic acid (MFA)), one biocide (triclosan (TCN)) and one plastic additive (bisphenol A (BPA)) by Trametes versicolor laccase. Experiments were conducted in spiked solutions at different pH values (from 3 to 9), enzyme concentrations (70-1400 Ul(-1)), reaction times (0-26 hours) and temperatures (10, 25 and 40°C) following a Doehlert experimental design. A semi-empirical model was developed to understand better the combined effects of the four factors and to determine optimal values. This model was able to fit well the experimental data (R(2)>0.97) and showed good predictive ability. All four factors had a significant effect on the micropollutant oxidation with the greatest influence shown by pH. Results for single compounds were different from those obtained for mixtures of micropollutants. For instance, DFC transformation occurred at much higher rates in mixtures under alkaline conditions. Optimal conditions were compound-dependent, but were found to be between pH 4.5 to 6.5 and between 25°C to more than 40°C. A laccase concentration of 730 Ul(-1) was sufficient to obtain a high removal rate (>90%) of the four individual compounds (range of times: 40 min to 5 hours), showing the potential of laccases to improve biodegradation of environmentally persistent compounds.
File Format	HTM / HTML
ISSN	18716784
Issue Number	6
Volume Number	30
e-ISSN	18764347
Journal	New Biotechnology
Language	English
Publisher	Elsevier
Publisher Date	2013-09-25
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Biomedical Engineering Discipline Molecular Biology Fungal Proteins Chemistry Laccase Trametes Enzymology Waste Water Water Pollutants, Chemical Water Purification Methods Hydrogen-ion Concentration Journal Article
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Biology Bioengineering Biotechnology

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Formulation and characterization of an immobilized laccase biocatalyst and its application to eliminate organic micropollutants in wastewater.

Utilization of horticultural waste for laccase production by Trametes versicolor under solid-state fermentation.

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Optimization of Laccase Production by Trametes versicolor Cultivated on Industrial Waste

Utilization of Horticultural Waste for Laccase Production by Trametes versicolor Under Solid-State Fermentation

Influence of treatment conditions on the oxidation of micropollutants by Trametes versicolor laccase.

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Influence of treatment conditions on the oxidation of micropollutants by Trametes versicolor laccase.