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Reduced mineralization of low concentrations of phenanthrene because of sequestering in nonaqueous-phase liquids

Article Abstract:

Astudy was conducted to determine if a nonaqueous-phase liquid (NAPL) can sequester a hydrophobic compound away from the aqueous phase such that biodegradation of the hydrophobic compound slows down or does not occur. The study protocol involved the use of di-2-ethylhexyl phthalate and heptamethylnonane as NAPLs, Pseudomonas as the biodegrading organism and phenanthrene as the hydrophobic compound. The results showed that NAPLs may sequester hydrophobic compounds and reduce their concentrations to an extent that biodegradation becomes very slow or does not occur at all.

Hydrocarbons, Nonaqueous solvents

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Mass transfer limitation of biotransformation: quantifying bioavailability

Article Abstract:

An analysis using a generic mathematical concept for bioavailability shows that the mass transfer of a chemical to a microorganism has a greater factor in pollution remediation than the intrinsic biochemical activity of the microorganisms. Such results imply that the pollutants' bioavailability may have been reduced because of their slow mass transfer to the degrading pollutants, providing insights into why the optimization of the activity of microbes by augmentation has not enhanced bioremediation.

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Selective chemical extractants to predict bioavailability of soil-aged organic chemicals

Article Abstract:

Observations show that some organic compounds that were initially bioavailable may be sequestered in soils and sediments leading to eventual unavailability to microorganisms. Research fortunately shows that a chemical assay may be developed to predict the bioavalability of organic chemicals sequestered in soil.

Pollutants

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