DOI: 10.5593/SGEM2014/B51/S20.016


P. Cojocaru, F. Statescu
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-17-9 / ISSN 1314-2704, June 19-25, 2014, Book 5, Vol. 1, 113-120 pp

The flushing of the soils in order to decontaminate them is a method which, upon the time, proved its technical efficiency in a great number of situations. Worldwide spread of this decontamination method has, as a principle, two explications: first of all it consists of having a great number of flushing agents (water, solutions, solvents) which can correspond to different soil situations and of contaminants and the second one it consists of having the possibility of using it “in situ” (relative reduce costs towards of the ones “ex situ” and “on situ”). Towards the flushing “in situ” the paper presents a simple and efficient method to evaluate the main technical elements of the contaminated soils flushing: calculus of the total flushing liquid and of the contaminant dynamics under the flushing influence. As a method of flushing for which we determine the calculus equations it is the flood case. In the paper, it is mark out that between the necessary volume of water for the effective flushing of the soil (percolation - solubilisation – convection – transport) and the volume of flushing liquid that must be brought to the situ surface, in order to flood it, it exists, according to the climatic conditions, significant differences. Because of that it is proposed that, for the drawn up of the decontamination design projects period, the evaluation of the necessary decontamination liquid should be done using the equations presented in the paper and also for a climatic period when the precipations are determine by statistic data analysis, with the probability of 80% overflow. In the paper, inside of “results and discussions” chapter it is amplified the application method of the proposed methodic for a cadmium polluted situ from Romania. It is proposed that the flushing of the soil profile should be done with water that comes from a surface source, being considered that the water has a low level of loading with cadmium. Also, in the case study, it is taken in consideration the phreatic input which also has a low level of cadmium ions. The carried out and presented in the paper studies point out, extremely evident, the manner how the abatement of the contamination level is produced to cadmium concentration values that are normal considered.

Keywords: flushing out, soils, flooding, pollution, liquid balance, contaminants.