English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/218275
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:


Fungal bioremediation of diuron-contaminated waters: Evaluation of its degradation and the effect of amendable factors on its removal in a trickle-bed reactor under non-sterile conditions

AuthorsHu, Kaidi; Torán, Josefina; López-García, Ester ; Barbieri, Maria Vittoria; Postigo, Cristina ; López de Alda, Miren ; Caminal, Glòria ; Sarrà, Montserrat; Blánquez, Paqui
KeywordsHerbicide removal
White-rot fungi
Transformation products
Response surface methodology
High-resolution mass spectrometry
Issue Date15-Nov-2020
CitationScience of the Total Environment 140628 (2020)
AbstractThe occurrence of the extensively used herbicide diuron in the environment poses a severe threat to the ecosystem and human health. Four different ligninolytic fungi were studied as biodegradation candidates for the removal of diuron. Among them, T. versicolor was the most effective species, degrading rapidly not only diuron (83%) but also the major metabolite 3,4-dichloroaniline (100%), after 7-day incubation. During diuron degradation, five transformation products (TPs) were found to be formed and the structures for three of them are tentatively proposed. According to the identified TPs, a hydroxylated intermediate 3-(3,4-dichlorophenyl)-1-hydroxymethyl-1-methylurea (DCPHMU) was further metabolized into the N-dealkylated compounds 3-(3,4-dichlorophenyl)-1-methylurea (DCPMU) and 3,4-dichlorophenylurea (DCPU). The discovery of DCPHMU suggests a relevant role of hydroxylation for subsequent N-demethylation, helping to better understand the main reaction mechanisms of diuron detoxification. Experiments also evidenced that degradation reactions may occur intracellularly and be catalyzed by the cytochrome P450 system. A response surface method, established by central composite design, assisted in evaluating the effect of operational variables in a trickle-bed bioreactor immobilized with T. versicolor on diuron removal. The best performance was obtained at low recycling ratios and influent flow rates. Furthermore, results indicate that the contact time between the contaminant and immobilized fungi plays a crucial role in diuron removal. This study represents a pioneering step forward amid techniques for bioremediation of pesticides-contaminated waters using fungal reactors at a real scale.
DescriptionIt is possible to consult this version in open access at the following web address: arXiv:2011.11638
Publisher version (URL)https://doi.org/10.1016/j.scitotenv.2020.140628
Appears in Collections:(IDAEA) Artículos
Files in This Item:
File Description SizeFormat 
Hu_diuron_repositorio.pdf Embargoed until November 15, 2021Artículo principal1,13 MBAdobe PDFThumbnail
View/Open    Request a copy
1-s2.0-S0048969720341504-mmc1.docxMaterial suplementario86,84 kBMicrosoft Word XMLView/Open
Show full item record
Review this work

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.