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The hydrocarbon contamination in the soil and
groundwater in the vicinity of a heating-oil storage tank of a barrack in Taszár
was known since 1994. The environmental survey of the area and the design of
the remediation system were completed in several steps. Two centre of the
contamination was discovered, and the total area of the contamination was 6300
m2 in case of the soil, and 18 000 m3 in case of the
groundwater. In the remediation plan several possible solutions were proposed,
which were later used in the operations.
The method proposed (and later carried out) with the
highest confidence was to use 32 production wells, a multi-stage water
treatment technology and skimmer equipment for free phase floating
hydrocarbons. In addition, the purified water was mixed with an enzymatic
fluid, and the resulting solution was injected with injection wells in to the
soil to strengthen the bioremediation processes and to increase the
effectiveness of the remediation.
There were two other methods proposed, however their
effectiveness and cost-efficiency was inferior to the method used. One of these
methods was to use the same water treatment technology as the previously
described, but water production and injection would have been done with
drainage ditches. The third was an ex-situ method, during which the soil would
have been extracted from the centres of the contamination and then transported
to a depot for later treatment.