Abstract
The dissolving potential of the Ca–minerals in concrete and limestone; and precipitation potential of metal ions from model acid water has been examined with attention to change of pH during the batch tests (L/S ratio = 300 ml /0.5 g, L = model solution with Mx+ (Ni; As; Zn; Cu; Fe) cations and (SO4)2- anion). Both of materials are the source of alkalinity-generating and move pH of acid solution to alkali region. The neutralization initiates the precipitation of metal contaminants in form of insoluble compounds. It was confirmed, that concrete is able to edit pH value more significantly at test conditions than limestone (calcite) if the initial pH of water is 1.5. Main effective compound of concrete is the portlandite – Ca(OH)2. The fact that concrete generated more alkaline environment during two hours tests the metal ions have been removed from water by concrete more effectively (100 %).
Highlights
Industry and mining deteriorated localities are the primary sources of contaminated water
Usual pollutants of the acid mine drainage consist of heavy metal ions from sulphide minerals dissolved in water followed by pH drop to value of 2 – 3 1-3
Chemical interactions among the components in solution are driven by chemical disequilibrium that persists in the system Ability of concrete and limestone to remove the metal ions (Ni, As, Zn, Cu) from contaminated water and change of pH demonstrate the results in Fig. 3 and Table 3
Summary
Industry and mining deteriorated localities are the primary sources of contaminated water. This work compares the effect of an adding concrete and limestone into water on shift of pH value to neutral and alkali region and studies the influence of pH on removal of Ni2+, As5+, Zn2+, Cu2+ and Fex+ ions from water. The ability of limestone and concrete to remove Ni, Zn. Cu, Fe, As ions from model water under the conditions of the batch tests was evaluated from concentration changes of Mx+ as follows: E Co C .100 % , (1.)
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