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Indicator bacteria variation in separate sewer systems in Östersund, Sweden: Preliminary results
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
Vatten Östersund.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
Länsstyrelsen i Norrbotten.
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2013 (English)Conference paper, Presentation (Refereed)
Abstract [en]

Faecal bacteria are a major pollution threat of water bodies designated for multipurpose use including drinking water sources or recreational purposes. Even though stormwater discharges may contribute significantly to microbiological pollution, they have not been fully investigated in the European context. We have studied the presence of indicator bacteria and total suspended solids (TSS) in stormwater discharged from four urban catchments, with areas between 5 and 40 ha, in Östersund, Sweden. The aim was to determine local variation of standard bacteria strains and TSS in Swedish urban catchments with specific land uses. Further, intra event variations were investigated. During dry weather, indicator bacteria concentrations in sewers conveying baseflow did not exceed 100 CFU/100 mL. During storm runoff, total coliform and int. enterococci concentrations increased 102 to 103 times, compared to those in baseflow. Compared to these two parameters, considerably lower concentrations were observed for E. coli and C. perfringens. Bacteria concentrations differed significantly among the sampling sites and partly, a first flush phenomenon was observed. Partly, significant correlations between TSS and indicator bacteria were observed. These were catchment specific and need a more detailed assessment. Further research will focus on seasonal variations and influential factors.

Place, publisher, year, edition, pages
Keyword [en]
indicator bacteria, local variation, separate sewer, stormwater quality, TSS, Civil engineering and architecture - Water engineering
Keyword [sv]
Samhällsbyggnadsteknik och arkitektur - Vattenteknik
Research subject
Urban Water Engineering
URN: urn:nbn:se:ltu:diva-37578Local ID: ba524871-d82e-4262-9044-6de1c15d02b3OAI: diva2:1011076
Novatech 2013 : International Conference on Planning and Technologies for Sustainable Urban Water Management 23/06/2013 - 26/06/2013
Godkänd; 2013; 20130821 (helgal)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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Galfi, HelenNordqvist, KerstinBlecken, Godecke-TobiasMarsalek, JiriViklander, Maria
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