COMPARING OF SULPHATES REMOVING FROM REAL MINE WATER AND MODEL SOLUTION USING BARIUM SALTS.

Smolnik is mining area in Slovakia with very serious impact of mining activities on environment. The mine is known from 13th century by producing of cooper, iron, silver and gold. Mine was closed in 90s of the 20th century. More than 6 milion ton of pyrite ores of various qualities have been abandoned in the mine. The water quality of the Smolnik stream dramatically decreased a short time after the closing of the mine. Smolnik stream is classified as one of more contaminated in Slovakia, especially in sulphates amount and pH values. This is the reason for searching this problem. It is common knowledge that Barium is suitable reagent for sulphate reducing. The paper deals with sulphates removing from model solution using BaCO3 and Ba(OH)2 at various pH values and also sulphates removing from real mine water from old mine Smolnik using the same Ba reagents. Summary of paper describes optimal value pH value and optimal amount of Ba reagent per 1 liter and duration of interaction reagent with water for reaching allowable values of sulphates in the water. [ABSTRACT FROM AUTHOR]