Pilot Experiment Of Immobilization Of Contaminants In-Situ

At the end of 2006 the project of pilot experiment of immobilization of contaminants in-situ was prepared in DIAMO, s. p., o. z. TUU. Realisation of the experiment is planned for years 2007 and 2008. The principle of immobilization of contaminants in-situ is to develop special conditions in water bearing sandstone sediments when transformation of contaminants from mobile form to immobile form can happen. Under the conditions of remediation after chemical mining (using sulphuric acid) of uranium on the deposit Straz it means injecting suitable alkaline medium and its spreading in contaminated sandstone aquifer. It will lead to decreasing of acidity of contaminated groundwater and precipitating of contaminants (SO42-, Al, Fe) in pores. This process is followed by co-precipitation and sorption of other toxic contaminants as As and Be. The results of the pilot experiment will be used for design of application of method of immobilization in-situ in the frame of remediation after chemical mining of uranium on the deposit Straz with the aim to decrease time and costs of the whole remediation process