Your browser doesn't support javascript.
loading
Biological treatment of triclosan using a novel strain of Enterobacter cloacae and introducing naphthalene dioxygenase as an effective enzyme.
Ghafouri, Mahsa; Pourjafar, Fatemeh; Ghobadi Nejad, Zahra; Yaghmaei, Soheila.
Afiliación
  • Ghafouri M; Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran.
  • Pourjafar F; Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran.
  • Ghobadi Nejad Z; Biochemical & Bioenvironmental Research Center, Sharif University of Technology, Azadi Avenue, P.O Box 11155-1399, Tehran, Iran.
  • Yaghmaei S; Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran; Biochemical & Bioenvironmental Research Center, Sharif University of Technology, Azadi Avenue, P.O Box 11155-1399, Tehran, Iran. Electronic address: yaghmaei@sharif.edu.
J Hazard Mater ; 459: 131833, 2023 10 05.
Article en En | MEDLINE | ID: mdl-37473572
In recent years, triclosan (TCS) has been widely used as an antibacterial agent in personal care products due to the spread of the Coronavirus. TSC is an emerging contaminant, and due to its stability and toxicity, it cannot be completely degraded through traditional wastewater treatment methods. In this study, a novel strain of Enterobacter cloacae was isolated and identified that can grow in high TCS concentrations. Also, we introduced naphthalene dioxygenase as an effective enzyme in TCS biodegradation, and its role during the removal process was investigated along with the laccase enzyme. The change of cell surface hydrophobicity during TCS removal revealed that a glycolipid biosurfactant called rhamnolipid was involved in TCS removal, leading to enhanced biodegradation of TCS. The independent variables, such as initial TCS concentration, pH, removal duration, and temperature, were optimized using the response surface method (RSM). As a result, the maximum TCS removal (97%) was detected at a pH value of 7 and a temperature of 32 °C after 9 days and 12 h of treatment. Gas chromatography-mass spectrometry (GC/MS) analysis showed five intermediate products and a newly proposed pathway for TCS degradation. Finally, the phytotoxicity experiment conducted on Cucumis sativus and Lens culinaris seeds demonstrated an increase in germination power and growth of stems and roots in comparison to untreated water. These results indicate that the final treated water was less toxic.
Asunto(s)
Palabras clave
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Triclosán / Contaminantes Químicos del Agua / Dioxigenasas Tipo de estudio: Prognostic_studies Idioma: En Revista: J Hazard Mater Asunto de la revista: SAUDE AMBIENTAL Año: 2023 Tipo del documento: Article País de afiliación: Irán Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Triclosán / Contaminantes Químicos del Agua / Dioxigenasas Tipo de estudio: Prognostic_studies Idioma: En Revista: J Hazard Mater Asunto de la revista: SAUDE AMBIENTAL Año: 2023 Tipo del documento: Article País de afiliación: Irán Pais de publicación: Países Bajos