Enzymatic post-treatment of ozonation: laccase-mediated removal of the by-products of acetaminophen ozonation

Ozonation is a powerful technique to remove micropollutants from wastewater. As chemical oxidation of wastewater comes with the formation of varying, possibly persistent and toxic by-products, post-treatment of the ozonated effluent is routinely suggested. This study explored an enzymatic treatment...

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Veröffentlicht in:Environmental science and pollution research international 2023-04, Vol.30 (18), p.53128-53139
Hauptverfasser: Schmiemann, Dorothee, Hohenschon, Lisa, Bartels, Indra, Hermsen, Andrea, Bachmann, Felix, Cordes, Arno, Jäger, Martin, Gutmann, Jochen Stefan, Hoffmann-Jacobsen, Kerstin
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container_issue 18
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container_title Environmental science and pollution research international
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creator Schmiemann, Dorothee
Hohenschon, Lisa
Bartels, Indra
Hermsen, Andrea
Bachmann, Felix
Cordes, Arno
Jäger, Martin
Gutmann, Jochen Stefan
Hoffmann-Jacobsen, Kerstin
description Ozonation is a powerful technique to remove micropollutants from wastewater. As chemical oxidation of wastewater comes with the formation of varying, possibly persistent and toxic by-products, post-treatment of the ozonated effluent is routinely suggested. This study explored an enzymatic treatment of ozonation products using the laccase from Trametes versicolor . A high-performance liquid chromatography coupled with high-resolution mass spectrometry (HPLC-HRMS) analysis revealed that the major by-products were effectively degraded by the enzymatic post-treatment. The enzymatic removal of the by-products reduced the ecotoxicity of the ozonation effluent, as monitored by the inhibition of Aliivibrio fischeri. The ecotoxicity was more effectively reduced by enzymatic post-oxidation at pH 7 than at the activity maximum of the laccase at pH 5. A mechanistic HPLC-HRMS and UV/Vis spectroscopic analysis revealed that acidic conditions favored rapid conversion of the phenolic by-products to dead-end products in the absence of nucleophiles. In contrast, the polymerization to harmless insoluble polymers was favored at neutral conditions. Hence, coupling ozonation with laccase-catalyzed post-oxidation at neutral conditions, which are present in wastewater effluents, is suggested as a new resource-efficient method to remove persistent micropollutants while excluding the emission of potentially harmful by-products. Graphical abstract
doi_str_mv 10.1007/s11356-023-25913-w
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subjects Acetaminophen
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
By products
Byproducts
Coriolus versicolor
Earth and Environmental Science
Ecotoxicology
Effluents
Environment
Environmental Chemistry
Environmental Health
Environmental science
enzymatic treatment
High performance liquid chromatography
Laccase
Lewis bases
Liquid chromatography
Mass spectrometry
Mass spectroscopy
Micropollutants
Nucleophiles
Oxidation
Ozonation
Ozone - chemistry
Phenolic compounds
Phenols
pollutants
polymerization
Polymers
Research Article
spectral analysis
toxicity
Trametes
Vibrio fischeri
Waste Disposal, Fluid - methods
Waste Water Technology
Wastewater
Wastewater oxidation
Wastewater treatment
Water Management
Water Pollutants, Chemical - analysis
Water Pollution Control
Water Purification - methods
title Enzymatic post-treatment of ozonation: laccase-mediated removal of the by-products of acetaminophen ozonation
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