Limit value: 200 mg/Nm3
Woody biomass-fuelled furnace:
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In the subsurface mine of Komló Zobák Shaft we started to close the mine in 1999 by collecting, transporting to the surface and getting disposed of the oily pollutants. The next step was the closure of the subsurface mining areas in the beginning of 2000, followed by infilling and capping the mining areas open to the surface. In this phase we infilled and capped the Central transport and air shaft of Zobák, the Diagonal transport and air shaft of Zobák (total 2,387 m long), the main ventilation inlet duct connected to the two air shafts as well as the 2.2 km long drift leading from the coal preparation plant to Zobák Shaft.
Reclamation of the spoil banks of the Zobák and Béta Shafts was performed by levelling the surface of the lands by eliminating level differences, flattening steep slopes, afforestation and grass growing to harmonize with the landscape.
Deep subsurface mining had four sites: Zobák Central Shaft, Diagonal Air Shaft, Béta Shaft and the coal preparation plant in the area of Altáró. By demolishing special mining facilities (e.g. headframes, collar houses, main vent duct, sedimentation shaft, coal preparation plant and other technological establishments, etc.) and the land rehabilitation of the yards the sites were made ready for reutilization. During the rehabilitation environmental damages due to the former mining activity were eliminated. Subsequently, the 30-hectare Zobák Central Shaft site and most of Zobák Diagonal Air Shaft site were sold. Since then, in the site of Zobák Central Shaft a new biomass heating plant (operated by Komlói Fűtőerőmű Zrt, the heating plant of Komló), while in the site of Diagonal Air Shaft a composting plant have been erected and commissioned.
In Altáró, in the coal preparation plant site practically all buildings and railways have been demolished and the entire area of the coal sorter, with the exception of the asphalt road, has received new soil top and new lawn.
Within the framework of the rehabilitation, 70 m3 oil-contaminated soil and in 4800 m2 area oil-contaminated groundwater remediation was performed. Land rehabilitation was completed by the end of 2002. The more than 6.2 hectare site was divided into 18 land plots, most of which have been sold. Since then, several shops (LIDL SUPERMARKET, TIKKURILA paint shop, oil shop, car wash) and car park serving the shops have been built in the site, furthermore the foundation works of a solar panel manufacturing plant has started.
The Pécs District Mines Inspectorate approved the implementation of our Company’s mine closure tasks in its Decision 7927/2002/4 of 11 March 2003.
Carrying out our long-term obligations, for the evaluation of the effects of the mine closure on the environment we have set up a water monitoring and a movement monitoring system. As part of the water monitoring system we have drilled 6 new boreholes and converted 2 existing ones.
The starting point of the movement monitoring system is the levelling wall pin of the church in Komló and ends at Zobák Puszta, including 7 base points and 8 main points in the reference line. This is connected to the monitoring points placed on the buildings in 13 streets of Gesztenyés district. The total levelling distance is 24 km long.
We regularly check the 5 infilled shafts within the mining site. There were only 5 events when we had to refill due to subsidence of the infill material.
The quality parameters of the water coming from under the spoil banks and the drift are regularly checked.
The above monitoring must be carried out until the mining site is withdrawn from mining activity. The site can be withdrawn from mining when no further impact can be expected on the environment as a result of mine closure.