First International Conference on MOLDAVIAN RISKS – FROM ...

<strong>First</strong> <strong>International</strong> <strong>Conference</strong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE
16-19 May 2012, Bacau, Romania
IN SITU SOIL FLUSHING – STUDIES ON YIELD OF
POLLUTED REMEDIATION SANDY SOILS WITH ORGANIC
COMPOUNDS ACIDS
Alexandra-Dana Chitimus, Valentin Nedeff, Emilian Mosnegutu
“Vasile Alecsandri” University of Bacau, Department of Environmental Engineering and
Mechanical Engineering
Corresponding author: Alexandra-Dana Chiţimuş, dana.chitimus@ub.ro
Abstract: Production activities have affected soils in time, by means of: mining,
excavations, waste deposits, landslides, erosion, salting, acidification etc. Currently, at an
international level, approximately 20 % of the soils are acidified, and in Romania there are
approximately 2 million hectares. The soil depollution process is very complex due to the
great number of factors which influence it, such as:
- properties of the soil, of geological formations or of subterraneous waters;
- pollutant’s properties;
- properties of the media with which the pollutant interacts.
After permeating the geological medium, pollutants go through some phenomena related
to: transport, transformation, transfer, accumulation and fixation. These phenomena
contribute to the spreading within, and distribution of, pollutants in the elements of the
geological environment and to the alteration of the chemical structure of the geological
medium. Techniques for the treatment of polluted soils have as an objective the
destruction, elimination or immobilization of pollutants. Depollution techniques can be
classified depending on the nature of procedures employed, as follows:
- physical procedures, which consist in the extraction of the pollutant from the
contaminated environment;
- biological procedures, which make use of microorganisms actions in order to eliminate
organic or mineral pollutants present in soil, silt, sediments or liquid effluents;
- thermal procedures, in which heat is used so as to neutralize the pollutant, to isolate it,
or to make it inert.
- chemical or electrochemical procedures using the chemical properties of pollutants in
order to make them inert, to destroy, or to separate from the polluted environment with
the help of adapted reactions.
For a soil remediation installation function on the principle soil flushing in situ for ensure a
high degree of treatment must be correctly identified correlations between: soil properties
that influence the treatment process, structural characteristics of the installation of
remediation and work factors. The theoretical and experimental research of the soil
depollution process presented in this dissertation constitute an attempt to offer, by means
of detailed analysis, the constructive and functional relations of dependence which can set
the basis of new depollution installations, created by way of modernizing the old ones, or
by devising new models, models which should be competitive with international ones.
Keywords: remediation of soil, organic acid compounds, in situ soil flushing, yield.
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