Bioremediation of Naphthalene and Methylnaphthalene Isomers

Petrox bioremediation accelerates the removal of naphthalene and isomers of methylnaphthalene.  These petroleum compounds are often slow to remediate due to their low volatility and strong affinity for absorption onto soil particles.  The remediation rate of these compounds is slower than BTEX compounds.  They often also rebound as the absorbed phase solubilizes following removal of the compound from ground water to reestablish phase equilibrium.  Petrox bioremediation accelerates the remediation of these compounds by a combination of metabolizing the dissolved phase and a biosurfactant effect that strips the compound from soil to make it available for metabolism.

For example, Petrox achieved more than 90% removal of these compound in less than 9 months at a site of a former underground storage tank (UST) in Florida.  After the UST and surrounding contaminated soil were removed, the residual BTEX compounds were treated by chemical oxidation.  The chemical oxidation, however, did not remove the naphthalene and methylnaphthalene isomers. Petrox was applied to the ground water in and around the former UST cavity.

Nine months after the Petrox application the following reductions in concentrations were achieved.  The concentrations are the average of four ground water sampling locations.

Naphthalene –  367 ug/L reduced to 18 ug/L,  95% removal.

1 Methylnaphthalene – 255 ug/L reduced to 33 ug/L, 87% removal.

2 Methylnaphthalene – 400 ug/L reduced to 30 ug/L, 93% removal.

The Petrox was injected into the ground through a continuous low-volume injection system.  This application method did not impact the use of the property or require major construction. The application was also far less costly than alternatives.

The greatest benefit was the relatively rapid removal of difficult contaminants.