ASSESSEMENT OF SOILS POLLUTED WITH HEAVY METALS FROM EMISSIONS EIGHT YEARS AFTER THE DOICEŞTI THERMAL POWER PLANT CLOSURE
Build in 1953 in Dâmboviţa County on 40 hectares, the Doiceşti thermal power plant worked based on combustion of the brown coal extracted from the Şotânga â€“ Filipeşti mining area. It was developed in multiple stages up to two groups by 200 MW installed in 1979. In 2009, because of the high operating costs and environmental issues, the Doiceşti thermal power plant has ceased operation. For assessing the effects on the soil in the area influenced by emissions released by thermal power plant exhaust chimneys, a field study was carried out in 2000 year, when soil samples were collected on 0-20 and 20-40cm depths from surveys placed on the cardinal directions, depending on the relief and the dominant winds. Samples have been analyzed to determine their main physico-chemical properties and heavy metals contents. In 2017, after eight years since the thermal power plant has been closed, another field study in the same surveys was carried out, in order to assess the new state of soil quality and heavy metals contents. Data recorded in 2017 as compared with 2000 show a decrease of the Pb, Cd, Co and Ni contents in most surveys, confirming basically that the emissions from the thermal power plant were the main source of soil loading with these heavy metals. Regarding the contents of Zn and Cu, that in normal concentrations are important nutrients for plants, they increased in many surveys after the thermal power plant shuting down, indicate as source of these increases the fertilizers used by landowners.