Statistical estimation of the relative efficiency of natural attenuation mechanisms in contaminated aquifers

Ole F. Christensen, Giorgio Cassiani, P. J. Diggle, Paulo Ribeiro, Giorgio Andreotti

Research output: Contribution to journalArticlepeer-review

Abstract

Using monitored natural attenuation is an increasingly popular strategy for dealing with contaminated aquifers. This paper provides a statistical methodology for the estimation of the relative efficiency of natural attenuation mechanisms. The methodology provides estimates, with associated measures of uncertainty, of the relative efficiency of four types of bio-degradation (oxidation using oxygen as the electron-acceptor, denitrification, iron reduction and sulfate reduction). A data set from Trecate, Italy, is analysed using the methodology. The analysis shows that sulfate is the main cause of hydrocarbon removal on this site. It is also seen that oxidation using oxygen seems to be more preferential than the other reactions, in the sense that this reaction is relatively more efficient than other reactions at locations where the hydrocarbon concentration is low.

Original languageEnglish (US)
Pages (from-to)339-350
Number of pages12
JournalStochastic Environmental Research and Risk Assessment
Volume18
Issue number5
DOIs
StatePublished - Oct 2004
Externally publishedYes

Keywords

  • Contaminated land
  • Hydrogeology
  • Likelihood inference
  • Natural attenuation
  • Spatial statistics

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry
  • Water Science and Technology
  • Statistics and Probability
  • Civil and Structural Engineering

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