| Popis: |
Generally, heavy metals can be removed from acid mine drainage by precipitation and sorption using neutralizing agents. The choice of the most effective neutralizing agent for acid mine drainage treatment depends on several things, such as: consumption of neutralizing agent, speed of pH achievement and removal of heavy metals from AMD. Several neutralizing agents, including BaCO3, Na2CO3, NaOH, KOH, K2CO3, MgO, CaCO3 and Ba(OH)2, are explored in this study in order to remove heavy metals from acid mine drainage. The experiments are performed in laboratory conditions using multi-component synthetic aqueous solution with same initial concentration (10 mg/l) of each ion, such as Cu, Mn, Zn, Fe and Pb and initial pH value of 1.9. Comparison of studied neutralizing agents for heavy metals removal from aqueous solutions shown that the most effective neutralizing agent for heavy metals removal from multi-component aqueous solution is MgO, while the lowest efficiency is obtained with Na2CO3. The percentage of heavy metals removed from aqueous solutions increases along with rising pH values. The high removal is obtained at pH 12 for all studied heavy metals and almost 80-82% removed of Pb, Fe and Cu, while almost 74% of Zn and Mn. The series for heavy metal removal from multi-component aqueous solution by neutralizing agents are also presented. |
