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Until
the mid 1950’s there was a functioning gravel mine in a part of the 18th
district of Budapest (Pestlőrinc). During the mining operations several
foundation pits were formed, and some of them was used as a temporary crude-oil
storage, which lead to the formation of the so-called „crude-oil lakes”. In
1997 the local government invited entries for a competition for damage control
and remediation, which was won by our company.
Additionally
the local government also applied for a subsidy, which could have been used for
the experimental application of new technologies, which were already known from
foreign technical literature, but were previously never used in the Hungarian
practice. This subsidy was won by two other companies.
The
aim of CEVA Magyarország Ltd. was utilization of a thermal desorption method
for soil cleaning, but the settings of the equipment from the USA was
unsuitable to use in Hungarian electrical network. During their work several modifications
were needed, and considering the available financial resources, the method
proved to be extremely expensive.
The
GENDER Budapest Ltd. wanted to use HARDOIL technology to skim the residual thin
crude-oil layer on the surface of the lakes. Additionally the company planned
the biological treatment of the soils as well. In the end their methods and
works did not prove to be effective enough so the task of crude-oil skimming
and biological soil cleaning was taken over by our company.
During
our operations 26 000 tons of crude-oil was skimmed from the surface of
the lakes and 490 m3 from the surface of the groundwater, and 35 490 m3 lake water and 250 000 m3 groundwater was pumped and treated with air-stripper towers. As a result the floating crude-oil layer and the contamination of the lakes was completely eliminated.
the lakes and 490 m3 from the surface of the groundwater, and 35 490 m3 lake water and 250 000 m3 groundwater was pumped and treated with air-stripper towers. As a result the floating crude-oil layer and the contamination of the lakes was completely eliminated.
In
case of soil treatment, only the activity of our company proved to be effective
and cost-efficient enough. We used ex situ enzymatic biological technology to
treat nearly 120 000 m3 soil from an area of 74 000 m2,
and decreased the concentration of the soil contamination from the initial
50 000 mg/kg to 2000 mg/kg.
50 000 mg/kg to 2000 mg/kg.