Investigating the Effect of Bioclogging on Electrical and Flow and Transport Properties of Porous Media
In many natural and engineered contaminant remediation systems, microbial growth and biomass accumulation can lead to pore clogging and cause significant changes in the flow and transport properties of the porous media (Seifert and Engesgaard, 2007; Brovelli et al, 2009). Bioclogging in porous media may result from accumulation of bacterial cells in the pore space, from biofilm development, or from excretion of extra-cellular polymers (Vandevivere and Baveye, 1992; Rinck-Pfeiffer, 2000). Recent advances in biogeophysical investigations have demonstrated the potential of geophysical techniques to elucidate microbial processes both in the laboratory and in the field (Atekwana and Slater, 2009). In the present study, flow through sand columns inoculated with Pseudomonas aeruginosa wild type (PAO1 Gfp), which is a model biofilm forming microorganism were used to investigate the effect of bioclogging on the complex conductivity and flow and transport properties. Our main objective is to determine how bioclogging manifests in the electrical properties of sands. Our secondary objective is to determine how complex conductivity relates to changes in hydraulic conductivity, which is a key parameter needed to model flow and transport in porous media. Our results suggest that bioclogging resulting from increases in microbial cell concentration and the production of exopolymeric substances EPS had a large impact on the imaginary conductivity, hydraulic conductivity, and porosity.
E. A. Atekwana et al., "Investigating the Effect of Bioclogging on Electrical and Flow and Transport Properties of Porous Media," Proceedings of the 16th European Meeting of Environmental and Engineering Geophysics: Near Surface 2010 (2010, Zurich, Switzerland), European Association of Geoscientists and Engineers, Sep 2010.
The definitive version is available at http://dx.doi.org/10.3997/2214-4609.20144917
16th European Meeting of Environmental and Engineering Geophysics: Near Surface 2010 (2010: Sep. 6-8, Zurich, Switzerland)
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
Geophysics; Hydraulic Conductivity; Porous Materials; Transport Properties; Biofilm Development; Biomass Accumulation; Complex Conductivity; Contaminant Remediation; Exopolymeric Substances; Extra Cellular Polymers; Geophysical Techniques; Pseudomonas Aeruginosa; Electric Properties
Article - Conference proceedings
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