Enzyme response of activated sludge to a mixture of emerging contaminants in continuous exposure


Autoři: Georgiana Amariei aff001;  Karina Boltes aff001;  Roberto Rosal aff001;  Pedro Leton aff001
Působiště autorů: Department of Chemical Engineering, University of Alcalá, Alcalá de Henares, Madrid, Spain aff001
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
doi: 10.1371/journal.pone.0227267

Souhrn

The relevant information about the impacts caused by presence of emerging pollutants in mixtures on the ecological environment, especially on the more vulnerable compartments such as activated sludge (AS) is relatively limited. This study investigated the effect of ibuprofen (IBU) and triclosan (TCS), alone and in combination to the performance and enzymatic activity of AS bacterial community. The assays were carried out in a pilot AS reactor operating for two-weeks under continuous dosage of pollutants. The microbial activity was tracked by measuring oxygen uptake rate, esterase activity, oxidative stress and antioxidant enzyme activities. It was found that IBU and TCS had no acute toxic effects on reactor biomass concentration. TCS led to significant decrease of COD removal efficiency, which dropped from 90% to 35%. Continuous exposure to IBU, TCS and their mixtures increased the activities of glutathione s-transferase (GST) and esterase as a response to oxidative damage. A high increase in GST activity was associated with non-reversible toxic damage while peaks of esterase activity combined with moderate GST increase were attributed to an adaptive response.

Klíčová slova:

Bacteria – Esterases – Glutathione chromatography – Chemical oxygen demand – Oxidative stress – Pollutants – Sludge – Water pollution


Zdroje

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