| dc.description.abstract | The article presents the results of study on the
ecological state of Slana River (Slovakia) and an
assessment of catastrophic pollution due to the mine
water leakage from the Siderit iron ore mine (village of
Nižná Slana). The geological structure of the siderite
deposit is described, the organization of geochemical data
monitoring is analyzed using trend analysis and a
correlation matrix for ecological and hydrochemical
tasks. The study has confirmed the increased content of
Fe, Ni, Mn, sulfates and As (components of the ore
formation). Spatial assessment of pollution was carried
out using mathematical modeling and the Google Earth
platform. It was identified that in the zone of mine water
leakage, there is an increase in temperature, a low level of
dissolved oxygen, a reduced pH and high concentrations
of sulfates, Mg, Fe, As, Co, Zn. Analysis of spatial
changes showed nonlinear (parabolic) dynamics of
pollutant distribution. Correlation analysis revealed a
strong positive relationship between pH and dissolved
oxygen (90% probability), nitrates, sulfates, nitrogen
(70–85%), Fe–sulfates, sulfates–nitrates, Mg–COD.
Negative correlation (70–80%) is characteristic of Mg–
nitrates, nitrates–dissolved solids (TDS), Ca–TDS.
Environmental harm of metals is exacerbated by
hardness, salinity and organic matter in water. Toxic
metals (Zn, Pb, Cu, Cd) form insoluble sulfides,
carbonates, precipitate (oxides/hydroxides) or coprecipitate with Fe, Mn, Al, with different redistribution
rates. A combination of methods is recommended for the purification of Slana River: mechanical, physicochemical
and biological with algolization of strain Chlorella
vulgaris Polikarp. Optimal conditions for the
development of Chlorella microalgae have been
determined. | en |
