The biological-mechanical bed procedure presents itself for all biologically degradable pollutants.
First, the soil is sieved to remove coarse soil components and interfering substances. Separated stones can be crushed and again added to the soil that is to be remediated. During screening the
soil is homogenised for the first time. The screened soil is transported into enclosed halls and piled up in the form of beds.
The nutrient concentration established on the basis of the feasibility study is provided for by adding mineral fertiliser and, if necessary, other aggregates. This is either done during the soil homogenisation, or before the soil is fed into the redevelopment plant or while working the bio-beds.
After piling up the beds the soil is regularly homogenised and aerated. This is achieved by cultivators, spade machines or milling machines. Volatile pollutants are suction cleaned by a exhaust air purifying plant and eliminated from the air. The treatment plant is always fitted with safety ventilation systems.
The remedial action is accompanied by regularly conducted analyses of the pollutant and nutrient concentration as well as the water content. If necessary, nutrients and water are
replenished. To prevent pollutant emission, the redevelopment plant is encapsulated against the ground and ambient air.
The encasing of the plant prevents pollutant discharge via the air as well as the infiltration of precipitation water. To keep the concentration of pollutant discharge in the tent interior low
and to prevent uncontrolled emission of polluted air, the exhaust air is permanently suction cleaned. The cleaning of the exhaust air is effected by an activated carbon container plant with
particle, main and police filter. These plants are designed to comply with the air-pollution law.
Besides the conventional procedures using microbiological methods to eliminate pollutants, Plambeck ContraCon also has a modified and patented procedure at it’s disposal to redevelop material contaminated with nitroaromates.