Barium Use for Sulphates Removal at Various pH Values

Abstract

Sulphates occur in waters mainly as a simple anion (SO) 4 2- . In waters with high sulphate concentration also ion associate anions with some cation occurrence is possible. Together with bicarbonates and chlorides they form a major part of anions in natural waters. In common groundwaters and surface waters sulphate content ranges in tens to hundreds of milligrams/liter. Particularly rich in sul - phates are some mineral waters. The article describes options of desulphurisation of real mine water. After the stage of aluminium compound using in previous rese - arch we examined using of barium compounds, namely BaCO 3 and Ba(OH) 2 . After application of these compounds on an artificial model solution we focused on the real mine water from a flooded mine Smolník. The tests were conducted at various values pH, at 12, 8, 4.5 with pre-treated real water and at pH 3.9 with untreated real water. From the results it can be concluded that there was high efficiency of desulphurisation at all levels of pH. In terms of the selection of a particular compound barium hydroxide Ba(OH) 2 was confirmed as the best.