DNAPL Dissolution in Bedrock Fractures And Fracture Networks

Abstract

This project focused on measuring and evaluating the architecture, dissolution rate, and impact on groundwater quality of residually trapped tetrachloroethene (PCE) dense non-aqueous phase liquid (DNAPL) from discrete bedrock fractures and fracture networks constructed at the bench-scale. Results demonstrated that residual DNAPL in rock fractures is not well contacted by migrating water. This resulted in reduced dissolution rates, and persistence of DNAPL sources within the bedrock fractures. Bioaugmentation was effective at substantially enhancing the rate of DNAPL removal, despite dissolved PCE concentrations that were near solubility. Chemical oxidation was shown to be ineffective for treating DNAPL sources in bedrock fractures. This ineffectiveness was due to decreases in the effective DNAPL-water interfacial area (as measured using interfacial tracers) that were likely caused by oxidation reaction byproducts.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2011
Accession Number
ADA556939

Entities

People

  • Charles E Schaefer
  • Jagadish Torlapati
  • John E McCray
  • Kaneen Christensen
  • Peggy Altman
  • Prabhakar Clement

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Alcohols
  • Alkenes
  • Aqueous Solutions
  • Chemical Properties
  • Detectors
  • Fatty Acids
  • Groundwater
  • Liquid Chromatography
  • Mass Transfer
  • Measurement
  • Organic Compounds
  • Physical Properties
  • Surface Tension
  • Three Dimensional
  • Two Dimensional
  • Volatile Organic Compounds
  • Water Resources

Fields of Study

  • Environmental science

Readers

  • Groundwater Contamination Remediation.
  • Materials Science (Mechanical Engineering).