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Principles of Microbial PAH-degradation in Soil

Principles of Microbial PAH-degradation in Soil. A.R. Johnsen et al. 2005 Environmental Pollution. 133, 71-84. P olycyclic A romatic H ydrocarbons 3+ fused benzene rings Incomplete combustion of organic matter Vehicle emissions Industrial coal gasification Wood preservatives.

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Principles of Microbial PAH-degradation in Soil

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  1. Principles of Microbial PAH-degradation in Soil A.R. Johnsen et al. 2005 Environmental Pollution. 133, 71-84

  2. Polycyclic Aromatic Hydrocarbons • 3+ fused benzene rings • Incomplete combustion of organic matter • Vehicle emissions • Industrial coal gasification • Wood preservatives

  3. Microbial Growth • Limited by dissolved amounts • Sorbed, NAPL-dissolved less bioavailable

  4. Soil Growth • Conditions not ideal • Absorbed • Inaccessible pores • Predation • Lack of diffusion

  5. Metabolism

  6. Anaerobic Degradation • Increasing evidence of NO3- and SO42- use • Implications for sediments, aquifers, and other anoxic environments

  7. Maximizing PAH Access Q/t = -DA(C0-Ct)/x

  8. I. Biosurfactants and Bioemulsifiers

  9. II. Diffusion DistanceIII. Concentration Gradient

  10. Consortia • Bacterial consortia • Bacterial-fungal consortia • Bacterial-multicellular animal consortia Mite Springtail Fungal Hyphae Round Worm

  11. Multiple means of degradation • Common traits • Consortia

  12. References • Johnsen at al., 2005. “Principles of microbial PAH-degradation in soil”. Environmental Pollution. 133:71-84 • Cerniglia, C.E., 1984. “Microbial metabolism of polycyclic aromatic hydrocarbons”. Advances in Applied Microbiology. 30, 31-71 • Cerniglia, C.E., 1992. “Biodegradation of polycyclic aromatic hydrocarbons”. Biodegradation. 3, 351-358

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