The General Strategy Of Kizel Coal Basin Remediation
Sedinin, Aleksey M.; Maksimovich, Nikolay G.; Khmurchik, Vadim T.; Demenev, Artem D.; Berezina, Olga A.
Natural Science Institute of Perm State University, Russian Federation
Acid rock drainage (ARD) is worldwide environmental problem. Development of ARD is especially characteristic to coal fields. We studied impact of ARD on environment in Kizel coal basin, Russia.
Kizel coal basin (KCB) is located on the east of Perm region, Russia, within West Urals folding zone adjacent to the pre-Ural boundary deflection. Exploitation of basin started in 1796. Folded geological structure of basin area and intensive karst processes in carbonate rocks determine a big amount of water inflow in mines. There is an elevated content of sulphur in basin coal also. These factors determine generation of large volume of acid mine water and drainage from waste piles. Cessation of mines in 1990s led to raising groundwater level, mine flooding and starting of acid mine water (pH is 2-3) discharge on surface. Over 35 million cubic meters of waste rocks were accumulated in more than 100 waste piles after cessation of mines, which provide generation of enormous volume of acid rock drainage. As a result these processes have led to deforestation of large area, river water contamination and accumulating of yellowboy precipitate covering river bed. The precipitate contains high content of such components as Fe, Mn, Cu and other chemical elements. So, this precipitate is considered as secondary source of pollution. Thus, over than 500 kilometres of river stream was degraded by acid drainage water.
Investigations of environmental problems in basin area began in 1980s. Different treatment methods were proposed: passive treatment based on geochemical barriers installed at the floor of waste pile and active mine water treatment constructions. At present we study the possibility of using various methods of environment remediation in KCB. It is planned to use both active and passive treatments: injection of alkaline reagents, sealing and recultivation of waste piles and some other techniques to neutralize mine water. We also plan to use GIS-modelling to choose proper displacement of treatment systems.