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Reduction of Escherichia coliEnterococcus faecalisand Pseudomonas aeruginosa in stormwater bioretention: Effect of drying, temperature and submerged zone
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0003-1725-6478
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0001-5548-4397
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0001-9541-3542
2019 (English)In: Journal of Hydrology X, ISSN 2589-9155, Vol. 3, article id 100025Article in journal (Refereed) Published
Abstract [en]

The impact of drying and temperature on the reduction of Escherichia coliEnterococcus faecalis and Pseudomonas aeruginosa in stormwater bioretention systems with and without a submerged zone was assessed using 16 pilot-scale bioretention columns under controlled laboratory conditions. The experimental design enabled analysis of possible interactions between the factors. First outflow and event-based samples were collected. Outflow concentrations were independent of inflow concentrations and hence controlled by internal processes. Overall TSS removal was high but sensitive to bacterial synthesis. Event-based samples had significantly higher bacteria concentrations than first outflow samples, suggesting that remaining/surviving bacteria in the bioretention cells have little effect on initial peak outflow concentrations. The effect of temperature varied between bacterial species and sample types. Long dry periods seemed beneficial for bacteria reduction, but outflow bacteria concentrations peaked during the second watering after long dry periods. Submerged zones significantly reduced bacteria outflow concentrations. However, sudden temperature increases caused bioretention cells with a submerged zone to produce significantly higher bacteria outflow concentrations than before the temperature increase, which was not the case for standard cells. Bioretention cells with submerged zones may thus be poor choices for reducing bacterial concentrations in stormwater runoff in areas experiencing winter conditions. Finally, our results suggest that adsorption (e.g. further enhanced by biofilm formation) is the major mechanism governing bacteria reduction in bioretention systems.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 3, article id 100025
Keywords [en]
Bacteria, Submerged zone, Stormwater, Bioretention, Winter performance, Wet and dry periods
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-73082DOI: 10.1016/j.hydroa.2019.100025OAI: oai:DiVA.org:ltu-73082DiVA, id: diva2:1292913
Available from: 2019-03-01 Created: 2019-03-01 Last updated: 2019-04-15Bibliographically approved
In thesis
1. Bioretention for stormwater quality treatment: Effects of design features and ambient conditions
Open this publication in new window or tab >>Bioretention for stormwater quality treatment: Effects of design features and ambient conditions
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Biofilter för dagvattenrening : design och omgivningspåverkan
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2019
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-73669 (URN)978-91-7790-362-8 (ISBN)978-91-7790-363-5 (ISBN)
Public defence
2019-05-29, C305, 10:00 (English)
Opponent
Supervisors
Available from: 2019-04-16 Created: 2019-04-15 Last updated: 2019-06-05Bibliographically approved

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Søberg, LailaViklander, MariaBlecken, Godecke-TobiasHedström, Annelie

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