1 In-Situ Treatment of Groundwater with Non-aqueous Phase Liquids December 10-12, 2002, Chicago, IL Scott G. Huling, Ph.D., P.E. USEPA Robert S. Kerr Environmental Research Center, Ada OK In-Situ Fenton Oxidation: A Critical Analysis Fundamental Chemistry Bench-scale Treatability Studies Field-scale Applications (pilot- or full-scale) Fate and Transport Issues 1
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In-Situ Fenton Oxidation: A Critical Analysis Fundamental Chemistry
In-Situ Treatment of Groundwater with Non-aqueous Phase Liquids December 10-12, 2002, Chicago, IL Scott G. Huling, Ph.D., P.E. USEPA Robert S. Kerr Environmental Research Center, Ada OK. In-Situ Fenton Oxidation: A Critical Analysis Fundamental Chemistry Bench-scale Treatability Studies - PowerPoint PPT Presentation
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In-Situ Treatment of Groundwater with Non-aqueous Phase Liquids
December 10-12, 2002, Chicago, IL
Scott G. Huling, Ph.D., P.E.USEPA Robert S. Kerr Environmental
Research Center, Ada OK
In-Situ Fenton Oxidation: A Critical AnalysisFundamental ChemistryBench-scale Treatability StudiesField-scale Applications (pilot- or full-scale)Fate and Transport Issues
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Fenton and Related ReactionsH2O2 + Fe+2 Fe+3 + OH- + ·OH (1)
H2O2 + Fe+3 Fe+2 + ·O2- + 2 H+ (2)
·O2- + Fe+3 Fe+2 + O2 (3)
·OH + Contaminant Products (CO2, Cl-, etc.) (4)Scavenging reactions n
Preferential pathways - greater rate of transport and oxidant delivery occurs through high conductive zones
Lower permeability zones - diffusion dominated transport << H2O2 reaction
Multiple applications
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Transport Issues
Representative volume Heat and O2(g) released - impact
Pneumatic transport of ground water Decreased DNAPL visc., increased mobilityDNAPL evaporationVolatilization of DNAPL componentsThermal desorption from the solid phaseEnhanced H2O2 decomposition
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Ground waterflow
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SVE is a Complimentary Technology to Fenton Oxidation
Capture/treat/dispose volatiles SVE may already be part of the remedyMinimize the transport/uncontrolled lossMinimize potential exposure pathwaysVent wells for deeper systems
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Performance Monitoring
Preferred monitoring parameters:target compound - aqueous (rebound: long
term vs. immediate), solidreaction byproducts - aqueousMetals - aqueousH2O2 - aqueous
Off-gas, soil gas samplesEstablish sentry wells
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… performance monitoringGround water monitoring
Low priority - limited value for performance evaluation