A Case Study of Natural Attenuation of Chlorinated Solvents Under Unstable Groundwater Conditions in Takahata, Japan

Yoshishige Kawabe, Takeshi Komai

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The natural attenuation behavior of chlorinated solvents and their risks to human health at a contaminated groundwater site in Takahata, Japan, were investigated. It was found that volatile organic compound (VOC) concentrations gradually decreased via two attenuation mechanisms, namely dilution and biodegradation. It was estimated that the VOC concentrations will be below the Japanese limits within 30 years after stopping the active remediation in 2003, which suggests that there is a high possibility that monitored natural attenuation can be adopted as the clean-up method at this contaminated site. The risk levels of VOCs at the present time are much lower than those at the time when the contamination was discovered. Vinyl chloride still presents a risk in some wells, and there were occasional unexpected increases in the risk levels of tetrachloroethylene, trichloroethylene, and cis-1,2-dichloloethylene, which means that continuous monitoring of the groundwater is necessary for forecasting risk levels.

Original languageEnglish
Pages (from-to)280-286
Number of pages7
JournalBulletin of Environmental Contamination and Toxicology
Volume102
Issue number2
DOIs
Publication statusPublished - 2019 Feb 15

Keywords

  • Biodegradation
  • Groundwater
  • Natural attenuation
  • Takahata
  • Volatile organic compounds (VOCs)

ASJC Scopus subject areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

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