Sorptive Amendments Work Together to Remediate MGP Sites



Sorptive Amendments Work Together to Remediate MGP Sites

Presenter:  James T Olsta (HUESKER, Inc.)
Authors:  Jim Olsta (HUESKER, Inc.), Kristof Thimm (HUESKER Synthetic GmbH)


Manufactured gas plant (MGP) sites typically have contaminated soil and sediment containing coal tar dense non-aqueous phase liquid (DNAPL) and dissolved polycyclic aromatic hydrocarbon (PAH) compounds.  Some sites also have elevated benzene, toluene, ethylbenzene and xylenes (BTEX) concentrations.  Sorptive amendments can be used in tandem to control coal tar and dissolved organic contaminants. Activated carbon has a long history of use in wastewater treatment vessels adsorbing dissolved organic compounds, such as PAHs and BTEX.  Coal tar is deleterious to activated carbon because coal tar can block its pores and reduce its dissolved organic compound adsorption efficiency. Organophilic clay has been shown to absorb ~100% by weight of DNAPL.  The two amendments can be used synergistically.  Organophilic clay, incorporated into a geotextile mat, has shown the ability to absorb coal tar seeping from waterway side slopes and sediments.  The coal tar absorbed by the mat quickly develops a weathered film and blinds off the DNAPL seep. A thicker layer of activated carbon and sand can be placed over the organophilic clay mat.  The activated carbon will be protected from coal tar by the organophilic clay mat.  Consequently, the activated carbon and sand layer can effectively adsorb the dissolved organic compounds that pass through the mat.   Activated carbon has entrained air and will tend to float. Activated carbon and sand mixtures have successfully been deployed through water onto lake sediments by deairing the carbon.  The carbon is deaired by storing it in water for an extended period of time. This presentation will include an innovative way of deploying the activated carbon and sand mixture that does not require deairing and can also be used in flowing rivers.


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