Abstract
The availability of persistent and hydrophobic compounds such as chlorinated dioxins (log Kow 3.4.-13.08 Mackay et al., 1992) for bacteria is often thought to be the limiting factor for their biodegradation and therefore also the limiting factor for the bioremediation of these compounds (Leahy and Colwell, 1990; Mihelcic et al., 1993; Harms and Bosma, 1997). The fraction of these compounds freely dissolved in the water phase is commonly thought to be the amount readily bioavailable (Belfroid et al., 1996). The fraction of the compound sorbed to sediment or to dissolved organic carbon (DOC) is thought to be either reversibly or irreversibly bound and therefore slowly or not at all available for biodegradation (Leahy and Colwell, 1990; Mihelcic et al., 1993; Harms and Bosma, 1997). In this situation the fraction dissolved in the water phase and the rate of desorption of the sorbed fraction determines the degradation rate of the compound. Sediment or DOC is often excluded from experiments to determine the rate of degradation of such compounds by micro-organisms. However, natural systems always include sediment or soil and DOC, and moreover bacteria tend to produce, to excrete or to be associated with DOC (Wetzel, 1975; Stumm and Morgan, 1981). This is an argument why DOC (or sediment) should be included in degradation experiments when bioavailability or bioremediation is studied.
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Toussaint, M., Krop, H.B., Grooteman, M.N., van Breugel, M., de Vries, P., Parsons, J.R. (1999). Bioavailability of 1,2,3,4-Tetrachlorodibenzo-p-Dioxin (TCDD) for Dechlorination by an Anaerobic Microbial Consortium, in the Presence of Dissolved Organic Carbon. In: Fass, R., Flashner, Y., Reuveny, S. (eds) Novel Approaches for Bioremediation of Organic Pollution. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4749-5_19
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DOI: https://doi.org/10.1007/978-1-4615-4749-5_19
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