RISCURILE GENERATE DE POLUAREA ACCIDENTALĂ A APEI RÂULUI ARIEŞ
ABSTRACT. - Accidental water pollution in the hydrographical basin of Arieş River. This type of water pollution it’s caused by the pollutants evacuations from pointed sources with high chemical concentrations, due to a technical accident, which affects water quality and creates damages to the aquatic ecosystems. The impact over the aquatic environment and over water use it’s similar to the impact caused by the pointed pollution sources but with greater effects. The main surface water pollution sources are wastewaters of different types, sweepings and industrial dumps which arrive in river network through various paths. The most important source of pollution in this area is the mining industry, which introduces in the environment a large quantity of waste. The rivers situated downstream the mines are changed concerning the water turbidity, color and taste, solved oxygen quantity, pH and water transparency. The accidental water pollution is due to some technical problems at the wastewater transportation pipes towards the decantation ponds, at the reverse wells and damages at the chemical and mechanical treatment stations. These characteristics determine the pollution level of the hydric environment from the basin of Aries River not only at the surface but also at the underground waters.