Transport characteristics of gas phase ozone in unsaturated porous media for in-situ chemical oxidation

Heechul Choi, Hyung Nam Lim, Jeongkon Kim, Tae Moon Hwang, Joonwun Kang

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

Laboratory column experiments were conducted by employing various porous media to delineate the characteristics of gaseous ozone transport in the unsaturated zone under various conditions. Water content, soil organic matter (SOM), and metal oxides (MOs) were found to be the factors most influential in the fate and transport of gaseous ozone in unsaturated porous media. The migration velocity of the gaseous ozone front was inversely proportional to the MO content of the porous media. Increased water content at fixed gas flux decreased the ozone breakthrough time proportionally as a result of reduced gas pore volume (PV) in the column, and increased pore water interfered with reactions of gaseous ozone with SOM and MOs on the surface of porous media. The feasibility of in-situ ozone injection for the remediation of unsaturated soils contaminated with either phenanthrene or diesel-range organics (DROs) was investigated under various conditions. The maximum removal after 1 h of ozone injection was achieved in columns packed with baked sand, followed, in descending order, by glass beads and by sand, indicating that catalytic ozone decomposition with MOs in columns packed with baked sand enhanced hydroxyl radical formation and resulted in increased contaminant removal. Overall removal efficiency of multicomponent C10-C24 DROs after 14 h of ozonation was 78.7%. Ozone transport was retarded considerably because of the high ozone demand of DROs, requiring more than 6 h for the gaseous ozone to initially break through the soil column under the experimental conditions tested in this study. Overall, gaseous ozone was readily delivered and transported to remediate unsaturated soils contaminated with phenanthrene and DROs.

Original languageEnglish
Pages (from-to)81-98
Number of pages18
JournalJournal of Contaminant Hydrology
Volume57
Issue number1-2
DOIs
Publication statusPublished - 2002 Jun 24

Fingerprint

Ozone
Porous materials
porous medium
Gases
ozone
oxidation
Oxidation
gas
Oxides
diesel
Soils
Metals
Sand
phenanthrene
Biological materials
Water content
sand
soil organic matter
chemical
in situ

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Water Science and Technology

Cite this

Choi, Heechul ; Lim, Hyung Nam ; Kim, Jeongkon ; Hwang, Tae Moon ; Kang, Joonwun. / Transport characteristics of gas phase ozone in unsaturated porous media for in-situ chemical oxidation. In: Journal of Contaminant Hydrology. 2002 ; Vol. 57, No. 1-2. pp. 81-98.
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Transport characteristics of gas phase ozone in unsaturated porous media for in-situ chemical oxidation. / Choi, Heechul; Lim, Hyung Nam; Kim, Jeongkon; Hwang, Tae Moon; Kang, Joonwun.

In: Journal of Contaminant Hydrology, Vol. 57, No. 1-2, 24.06.2002, p. 81-98.

Research output: Contribution to journalArticle

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