"We modelled a fuel accident at Soilia and compared the purification efficiency of in-situ remediation procedures in an experiment that lasted for approximately one year.
We purified the contaminated soil by means of biostimulation achieved through the application of additional nutrients, as well as chemical oxidisation based on the injection of hydrogen peroxide. The point of comparison was natural remediation, in which soil is left untreated.
During the experiment we monitored fuel concentrations, microbial concentrations as well as changes in the bacterial colonies in the soil and the water seeping through the soil.
What we found was that the contamination and the remediation procedures increased microbial concentrations and changed the structure of bacterial colonies.
The most effective remediation method turned out to be biostimulation, which clearly reduced the amount of contaminants seeping through the soil.
Soilia made it possible for us to compare remediation methods on a large scale and in natural conditions, facilitating the practical application of the results."
Suvi A. Simpanen
RIMA (Risk Management and Remediation of Chemical Accidents)
University of Helsinki | Department of Environmental Sciences