Synergistic Treatment of BTEX Compounds Using Oxidation and Free Radical Chemistries

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ABSTRACT: In an unusual delivery process, prompted by the historical in-situ delivery via permanent points, the unconventional introduction of a remedial solution to the groundwater using numerous pits effectively overcame site specific obstacles. A two phase program effectively at the site in Saint Augustine, Florida, introduced the remedial chemicals sodium persulfate, hydrogen peroxide and zero-valent iron (ZVI) directly into the soil and groundwater using constructed reaction pits, in which the remedial materials were first loaded than dispersed through the effected soil interface by backfilling the pit with clean fill or screened soil.  The first element of the degradation program produced hydroxyl and sulfate free radicals, the second utilized the decomposition products of the phase one reactions to effect facultative biological activity.  A modified Fenton’s chemistry and persulfate chemistry was integrated at the site, utilizing zero-valent iron as a catalyst for both reactions.  The result of the remediation was an overall reduction in BTEX concentrations of over 70% in eight months.

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