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Closed Access item Triclosan persistence through wastewater treatment plants and its potential toxic effects on river biofilms

Authors:Ricart, Marta
Guasch, Helena
Alberch, Mireia
Barceló, Damià
Bonnineaub, Chloé
Geiszinger, A.
Farré Urgell, Marinel.la
Ferrer, Josep
Ricciardi, Francesco
Romaní, Anna
Morin, Soizic
Proia, Lorenzo
Sala, Lluís
Sureda, David
Sabater, Sergi
Keywords:Biofilm communities, Triclosan toxicity, Microfiltration, Reverse osmosis, Wastewater treatment plants, Experimental channels
Issue Date:2010
Publisher:Elsevier
Citation:Aquatic Toxicology
Abstract:Triclosan is a commonly used bactericide that survives several degradation steps in WWTP (wastewater treatment plants) and potentially reaches fluvial ecosystems. In Mediterranean areas, where water scarcity results in low dilution capacity, the potential environmental risk of triclosan is high. A set of experimental channels was used to examine the short-term effects of triclosan (from 0.05 to 500 μg L−1) on biofilm algae and bacteria. Environmentally relevant concentrations of triclosan caused an increase of bacterial mortality with a no effect concentration (NEC) of 0.21 μg L−1. Dead bacteria accounted for up to 85% of the total bacterial population at the highest concentration tested. The toxicity of triclosan was higher for bacteria than algae. Photosynthetic efficiency was inhibited with increasing triclosan concentrations (NEC = 0.42 μg L−1), and non-photochemical quenching mechanisms decreased. Diatom cell viability was also affected with increasing concentrations of triclosan. Algal toxicity may be a result of indirect effects on the biofilm toxicity, but the clear and progressive reduction observed in all the algal-related endpoints suggest the existence of direct effects of the bactericide. The toxicity detected on the co-occurring non-target components of the biofilm community, the capacity of triclosan to survive through WWTP processes and the low dilution capacity that characterizes Mediterranean systems extend the relevance of triclosan toxicity beyond bacteria in aquatic habitats.
Publisher version (URL):http://dx.doi.org/10.1016/j.aquatox.2010.08.010
URI:http://hdl.handle.net/10261/44890
ISSN:0166-445X
E-ISSNmetadata.dc.identifier.doi = DOI:1879-1514
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Appears in Collections:(IDAEA) Artículos

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