Improved Understanding of Fenton-like Reactions for the In Situ Remediation of Contaminated Groundwater Including Treatment of Sorbed Contaminants and Destruction of DNAPLs

摘要

The study of CHP ISCO (catalyzed H202 propagations in situ chemical oxidation) demonstrates that is it characterized by more complex chemistry than previously conceived. In particular, superoxide has a major role in the degradation of highly oxidized contaminants, the destruction of DNAPLs, and enhanced desorption of hydrophobic contaminants from soils and subsurface solids. The suite of reactive oxygen species generated in CHP reactions, including hydroxyl radical, superoxide, and the strong nucleophile hydroperoxides, provide a near-universal treatment matrix. However, the rapid decomposition of hydrogen peroxide, promoted by natural iron and manganese oxides in the subsurface, has previously limited the utility of CHP for the remediation of contaminated sites. Advances attained through the completed research in the stabilization of hydrogen peroxide by citrate, malonate, and phylate will increase the utility and economic viability of CHP treatment. The results of this research will enable field personnel to better design CHP ISCO systems and apply the process more effectively and economically.