A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Sustainability of the in situ bio-barriers for contaminant containment in residual soils
Bio-barrier is a promising new technology to contain subsurface contaminant plume by manipulation of hydraulic conductivity. The barrier can be formed by the subsurface injection of microorganism and nutrients. The subsequent growth of the biofilm clog soil pore to form a barrier. In this research, the hydraulic conductivity changes of biomass-soil mixtures by the adverse conditions were studied to evaluate the applicability to the field condition as an alternative barrier material. Series of hydraulic conductivity tests were carried out to measure the hydraulic conductivity changes of microorganism and residual soil mixture in rigid-wall mold. The microorganisms used in this research were bacterium,Azotobacter chroococcum and fungus,Aureobasidium pullulans, respectively. The hydraulic conductivity decreased to 1 to 10% of the initial hydraulic conductivity of residual soil, 1×10−4 cm/s, and stayed constant while substrate was provided. Under adverse conditions such as no substrate available, chemical solution permeation, and freeze-thaw cycles, the hydraulic conductivity increased by 30 to 50% compare to the lowest value. The hydraulic conductivity, however, decreased again to the lowest value if nutrients were provided for both bacterium-soil mixture and fungus-soil mixture.
Sustainability of the in situ bio-barriers for contaminant containment in residual soils
Bio-barrier is a promising new technology to contain subsurface contaminant plume by manipulation of hydraulic conductivity. The barrier can be formed by the subsurface injection of microorganism and nutrients. The subsequent growth of the biofilm clog soil pore to form a barrier. In this research, the hydraulic conductivity changes of biomass-soil mixtures by the adverse conditions were studied to evaluate the applicability to the field condition as an alternative barrier material. Series of hydraulic conductivity tests were carried out to measure the hydraulic conductivity changes of microorganism and residual soil mixture in rigid-wall mold. The microorganisms used in this research were bacterium,Azotobacter chroococcum and fungus,Aureobasidium pullulans, respectively. The hydraulic conductivity decreased to 1 to 10% of the initial hydraulic conductivity of residual soil, 1×10−4 cm/s, and stayed constant while substrate was provided. Under adverse conditions such as no substrate available, chemical solution permeation, and freeze-thaw cycles, the hydraulic conductivity increased by 30 to 50% compare to the lowest value. The hydraulic conductivity, however, decreased again to the lowest value if nutrients were provided for both bacterium-soil mixture and fungus-soil mixture.
Sustainability of the in situ bio-barriers for contaminant containment in residual soils
KSCE J Civ Eng
Kim, Geon Ha (author) / Kim, Jong Heun (author)
KSCE Journal of Civil Engineering ; 8 ; 189-195
2004-03-01
7 pages
Article (Journal)
Electronic Resource
English
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