To protect groundwater resources against pesticides, bioaugmentation with microorganisms immobilized in solid carriers has been considered as a soil remediation strategy. We have developed a mathematical model to assess this bioremediation approach to remove the pesticide linuron from soils at various water saturation levels. A bacterium mineralizing linuron is heterogeneously distributed within a 3-D model domain in spherical hotspots of 2-mm diameter size. Diffusion and advection due to infiltration are the transport processes, and microbial growth follows first order kinetics. Without advection, a bead spacing distance of 5 mm at saturated conditions is required to achieve a bioremediation goal of 90% linuron mineralization in 1 year. The gas phase is an important parameter affecting the transport of linuron, however, linuron biodegradation is growth kinetics limited within a broad water saturation range. It is hypothesized that the selection of faster degraders can compensate for high amounts of required beads.
|Title of host publication||GQ10 : CD-ROM|
|Publication status||Published - 2010|
|Event||Groundwater Quality Management in a Rapidly Changing World : 7th International Groundwater Quality Conference - Zurich, Switzerland|
Duration: 13 Jun 2010 → 18 Jun 2010
Conference number: 7
|Conference||Groundwater Quality Management in a Rapidly Changing World : 7th International Groundwater Quality Conference|
|Period||13/06/2010 → 18/06/2010|
Owsianiak, M., Dechesne, A., Binning, P. J., & Smets, B. F. (2010). Modelling bioaugmentation in unsaturated porous media: The linuron herbicide example. In GQ10: CD-ROM (Vol. Keynote S6). IAHS Press.