Potential consolidation-induced NAPL migration from coal tar impacted river sediment under a remedial sand cap

Yong Sang Kim, Chad T. Jafvert, Sungmin Yoon, Seunghun Hyun, Brian Johnson

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Subaqueous sediment, if capped for remediation purposes, may undergo consolidation due to the increased effective weight of the capping material. The standard Atterberg limits test and a modified drained three-dimensional consolidation test (DTCT) were performed on sediment collected from a river adjacent to a former manufactured gas plant site that contains high concentrations of coal tar. The plastic limit of five sediment samples ranged between 72 and 89%, and the liquid limit ranged between 123 and 194%. The plasticity index ranged from 51 to 122%, with the values among the sediments correlating with the coal tar content (r2 = 0.93). DTCT experiment was performed on 5 cm sediment overlain with 5 cm sand to a maximum applied effective cell pressure of 41.4 kPa. Consolidation increased almost linearly at lower pressures (<13.8 kPa); however, as higher pressures were imposed, the ratio of consolidation per applied pressure decreased. The results of this study suggest that porewater advection, resulting from sediment consolidation, will occur from the sediment to the capping material. Because this water will contain numerous polycyclic aromatic hydrocarbons, measures, such as adding sorptive materials, should be taken to reduce the flux of these compounds.

Original languageEnglish
Pages (from-to)1364-1370
Number of pages7
JournalJournal of Hazardous Materials
Volume162
Issue number2-3
DOIs
Publication statusPublished - 2009 Mar 15

Fingerprint

Coal Tar
coal tar
Coal tar
nonaqueous phase liquid
Rivers
Consolidation
fluvial deposit
consolidation
Sediments
Sand
Pressure
sand
sediment
capping
Polycyclic Aromatic Hydrocarbons
Plastics
Atterberg limit
Gases
liquid limit
Gas plants

Keywords

  • Coal tar
  • Consolidation
  • NAPL migration
  • Sand cap
  • Sediment

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Environmental Chemistry
  • Environmental Engineering

Cite this

Potential consolidation-induced NAPL migration from coal tar impacted river sediment under a remedial sand cap. / Kim, Yong Sang; Jafvert, Chad T.; Yoon, Sungmin; Hyun, Seunghun; Johnson, Brian.

In: Journal of Hazardous Materials, Vol. 162, No. 2-3, 15.03.2009, p. 1364-1370.

Research output: Contribution to journalArticle

Kim, Yong Sang ; Jafvert, Chad T. ; Yoon, Sungmin ; Hyun, Seunghun ; Johnson, Brian. / Potential consolidation-induced NAPL migration from coal tar impacted river sediment under a remedial sand cap. In: Journal of Hazardous Materials. 2009 ; Vol. 162, No. 2-3. pp. 1364-1370.
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