Application of an in-situ soil sampler for assessing subsurface biogeochemical dynamics in a diesel-contaminated coastal site during soil flushing operations

Man Jae Kwon, Edward J. O'Loughlin, Baknoon Ham, Yunho Hwang, Moojoon Shim, Soon-Jae Lee

Research output: Contribution to journalArticle

Abstract

Subsurface biogeochemistry and contaminant dynamics during the remediation of diesel-contamination by in-situ soil flushing were investigated at a site located in a coastal region. An in-situ sampler containing diesel-contaminated soils separated into two size fractions (<0.063- and <2-mm) was utilized in two monitoring wells: DH1 (located close to the injection and extraction wells for in-situ soil flushing) and DH2 (located beyond sheet piles placed to block the transport of leaked diesel). Total petroleum hydrocarbon (TPH) concentrations and biogeochemical properties were monitored both in soil and groundwater for six months. A shift occurred in the groundwater type from Ca-HCO 3 to Na-Cl due to seawater intrusion during intense pumping, while the concentrations of Ni, Cu, Co, V, Cr, and Se increased substantially following surfactant (TWEEN 80) injection. The in-situ sampler with fine particles was more sensitive to variations in conditions during the remedial soil flushing process. In both wells, soil TPH concentrations in the <0.063-mm fraction were much higher than those in the <2-mm fraction. Increases in soil TPH in DH1 were consistent with the expected outcomes following well pumping and surfactant injection used to enhance TPH extraction. However, the number of diesel-degrading microorganisms decreased after surfactant injection. 16S-rRNA gene-based analysis also showed that the community composition and diversity depended on both particle size and diesel contamination. The multidisciplinary approach to the contaminated site assessments showed that soil flushing with surfactant enhanced diesel extraction, but negatively impacted in-situ diesel biodegradation as well as groundwater quality. The results also suggest that the in-situ sampler can be an effective monitoring tool for subsurface biogeochemistry as well as contaminant dynamics.

Original languageEnglish
Pages (from-to)938-948
Number of pages11
JournalJournal of Environmental Management
Volume206
DOIs
Publication statusPublished - 2018 Jan 15

Fingerprint

flushing
sampler
diesel
Soil
Soils
petroleum hydrocarbon
Petroleum
Hydrocarbons
surfactant
Surface-Active Agents
Groundwater
Surface active agents
soil
Crude oil
Biogeochemistry
Injections
biogeochemistry
well
groundwater
pumping

Keywords

  • Diesel contamination
  • In-situ sampler
  • Microbial community dynamics
  • Seawater intrusion
  • Soil flushing

ASJC Scopus subject areas

  • Environmental Engineering
  • Waste Management and Disposal
  • Management, Monitoring, Policy and Law

Cite this

Application of an in-situ soil sampler for assessing subsurface biogeochemical dynamics in a diesel-contaminated coastal site during soil flushing operations. / Kwon, Man Jae; O'Loughlin, Edward J.; Ham, Baknoon; Hwang, Yunho; Shim, Moojoon; Lee, Soon-Jae.

In: Journal of Environmental Management, Vol. 206, 15.01.2018, p. 938-948.

Research output: Contribution to journalArticle

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