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- Title
Development and resistance of a biofilm in a planar fracture during biostimulation, starvation, and varying flow conditions.
- Authors
Ross, Nathalie; Novakowski, Kent S.; Lesage, Suzanne; Deschênes, Louise; Samson, Réjean
- Abstract
Investigations of biofilms in a planar fracture are required to develop a biobarrier concept in aquifers. A glass-fracture apparatus was designed to monitor a biofilm under three phases: biostimulation, starvation, and increased flow. Direct observations were performed using a light probe whereas indirect indications were obtained by enumerating planktonic bacteria, monitoring the oxidation–reduction potential (ORP), and interpreting tracer experiments using an analytical model for two-dimensional advection-dispersion. Biofilm clusters developed along the flow lines before extending to a fully-connected biofilm, covering 500 cm2 after 50 d. The starvation phase favoured bacterial attachment at first followed by detachment, which was accentuated by increases in groundwater velocity. The ORP declined over the three experimental phases and was significantly related to the distance from the biostimulation zone. The modeling suggested that an increase in transverse dispersion within the fracture only occurs during the biostimulation phase.
- Subjects
BIOFILMS; AQUIFERS; OXIDATION; BACTERIA; DISPERSION (Chemistry); MICROBIAL aggregation
- Publication
Journal of Environmental Engineering & Science, 2007, Vol 6, Issue 4, p377
- ISSN
1496-2551
- Publication type
Article
- DOI
10.1139/S06-056