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Biocides in urban wastewater treatment plant influent at dry and wet weather: concentrations, mass flows and possible sources
Aarhus University, Denmark.ORCID-id: 0000-0001-7834-1364
Technical University of Denmark, Denmark.
Technical University of Denmark, Denmark.ORCID-id: 0000-0002-5472-8553
Lund University.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 60, s. 64-74Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In recent years, exterior thermal insulation systems became more and more important leading to an increasing amount of houses equipped with biocide-containing organic façade coatings or fungicide treated wood. It is known that these biocides, e.g. terbutryn, carbendazim, and diuron, as well as wood preservatives as propiconazole, leach out of the material through contact with wind driven rain. Hence, they are present in combined sewage during rain events in concentrations up to several hundred ng L(-1). The present study focused on the occurrence of these biocides in five wastewater treatment plants in Denmark and Sweden during dry and wet weather. It was discovered, that biocides are detectable not only during wet weather but also during dry weather when leaching from façade coatings can be excluded as source. In most cases, the concentrations during dry weather were in the same range as during wet weather (up to 100 ng L(-1)); however, for propiconazole noteworthy high concentrations were detected in one catchment (4.5 μg L(-1)). Time resolved sampling (12 × 2 h) enabled assessments about possible sources. The highest mass loads during wet weather were detected when the rain was heaviest (e.g. up to 116 mg h(-1) carbendazim or 73 mg h(-1) mecoprop) supporting the hypothesis that the biocides were washed off by wind driven rain. Contrary, the biocide emissions during dry weather were rather related to household activities than with emissions from buildings, i.e., emissions were highest during morning and evening hours (up to 50 mg h(-1)). Emissions during night were significantly lower than during daytime. Only for propiconazole a different emission behaviour during dry weather was observed: the mass load peaked in the late afternoon (3 g h(-1)) and declined slowly afterwards. Most likely this emission was caused by a point source, possibly from inappropriate cleaning of spray equipment for agriculture or gardening.

sted, utgiver, år, opplag, sider
2014. Vol. 60, s. 64-74
Emneord [en]
Combined sewer, Diffuse pollution, Stormwater, Building façades, Dry weather sources
HSV kategori
Forskningsprogram
Naturvetenskap, Miljövetenskap
Identifikatorer
URN: urn:nbn:se:lnu:diva-66649DOI: 10.1016/j.watres.2014.04.014OAI: oai:DiVA.org:lnu-66649DiVA, id: diva2:1120051
Tilgjengelig fra: 2017-07-05 Laget: 2017-07-05 Sist oppdatert: 2017-11-27bibliografisk kontrollert

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Bollmann, Ulla E.Eriksson, EvaVollertsen, JesBester, Kai
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