Dissertation is dedicated to the research of wastewater from waste heaps of coal mines of Novovolynsk mining area, analysis of the measures system to increase the environmental safety of the mining complex. Establishing the levels of environmental hazard of wastewater from coal mine dumps, investigation of the seasonal dynamics of heavy metals content in wastewater from waste heaps, design and calculation of bioplates gives an opportunity to introduce the advanced technologies for treatment of wastewater from mine waste heaps and improve environmental safety of the region. As a result of water samples analysis, an increase in the content of ammonium salts was determined. It is known that the main danger of pollution of the hydrosphere with ammonium salts is the supersaturation of water with ammonia. The content of ammonium salts above 0.1 mg/dm3 indicates the water pollution, because ammonia is the first compound formed during the decomposition of organic nitrogen-containing substances. Simultaneous occurrence of ammonia, nitrites and nitrates, sulfates, bicarbonates in the water samples indicates a significant contamination of wastewater due to oxidation of the rock in the dump and its leaching with water. An increase of nitrites and nitrates content in water samples without ammonia indicates the isolation of the source of contamination. Analyzing the ecological situation as a result of spillage of wastewater from dumps of mines №: 2, 4, 9 of Novovolynsk mining area it should be noted that currently storm sewer system is absent there, so rainwater from the surfaces of waste heaps and industrial sites spontaneously drain in lowlands and concentrates by mineral salts. It is known that the mines of this area are characterized by significant inflows into the main and preparatory mine workings, so the formed effluents around the perimeter of the existing dumps are collected in water diversion channels. The causes and consequences of the growth of environmental hazard level in mining complexes, seasonal dynamics of the chemicals content in wastewater from mine heaps, heavy metals content in wastewater and vegetation were established; scientifically substantiated calculation of biological ponds for wastewater treatment and measures to overcome the negative impact of man-made wastewater pollution on biota were suggested; by applying the GIS project "Open Environment" the analysis of the water body quality of the area was carried out. The geoinformation interactive map is built on the basis of statistical data of the State Agency of Water Resources of Ukraine and data of satellite observations. Water quality indicators confirm the fact that besides the wind 24 erosion of waste heaps, the water erosion of waste heaps is of a high concern, which leads to leaching of toxic pollutants into soil and groundwater. Pollution spreads with wastewaters over long distances of adjacent territories, in particular to the surface waters of the Western Bug basin. Keywords: environmental safety, environmental hazard, dumps of coal mines, waste heaps, waste heaps wastewater, mining complexes, biological pond.
