Biodegradation of hydrophobic pesticides by microalgae : transformation products and impact on algae biochemical methane potential
Avila, Romina (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Peris, Andrea (Institut de Diagnosi Ambiental i Estudis de l'Aigua)
Eljarrat, Ethel (Institut de Diagnosi Ambiental i Estudis de l'Aigua)
Vicent i Huguet, Teresa (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Blánquez Cano, Paqui (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)

Fecha:	2021
Resumen:	Intensive and extensive use of pesticides has contributed to their wide distribution in soil, air, and water. Due to their detrimental effects on non-target organisms, different technologies have been considered for their removal. In this work, three hydrophobic pesticide active compounds, namely, chlorpyrifos, cypermethrin, and oxadiazon, were selected to study the potential for their removal from aqueous media by a microalgae consortium. An abiotic and a killed control (thermally inactivated dead microalgae biomass) were employed to clarify their removal pathways, and pesticide content was quantified in liquid and biomass phases for 7 days. At the final time, total degradation (biodegradation plus photodegradation) contributed to the removal of 55% of oxadiazon, 35% of chlorpyrifos, and 14% of cypermethrin. Furthermore, more than 60% of chlorpyrifos and cypermethrin were removed by sorption onto microalgae biomass. Overall, the three pesticides showed high removal from the liquid phase. O,O-diethyl thiophosphate was identified in the liquid phase as a transformation product of chlorpyrifos formed by microalgae degradation. Phycoremediation was coupled with anaerobic degradation of the microalgae biomass containing the retained pesticides by sorption through biochemical methane potential tests. Anaerobic digestion was not inhibited by the pesticides as verified by methane production yields. The removal efficiency of the pesticides in the digestate was as follows: chlorpyrifos > cypermethrin > oxadiazon. These results highlight the potential of low-cost algal-based systems for the treatment of wastewater or effluents from agrochemical industries. The integration of wastewater treatment with biogas production through anaerobic digestion is a biorefinery approach that facilitates the economic feasibility of the process.
Ayudas:	Ministerio de Ciencia e Innovación CEX2018-000794-S Ministerio de Economía y Competitividad CTM2016-75587-C2-1-R Ministerio de Economía y Competitividad CTM2016-75587-C2-2-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1404 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-014
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió acceptada per publicar
Materia:	Biodegradation-Phycoremediation ; Microalgae ; Agrochemicals ; Metabolites ; Biochemical methane potential
Publicado en:	Science of the total environment, Vol. 754 (February 2021) , art. 142114, ISSN 1879-1026

DOI: 10.1016/j.scitotenv.2020.142114
PMID: 32911153

Postprint 30 p, 715.6 KB

El registro aparece en las colecciones:
Artículos > Artículos de investigación
Artículos > Artículos publicados