Shahrood University of Technology Journal of Mining and Environment 2251-8592 13 3 2022 07 01 Comparison of Efficiencies of Neutralizing Agents for Heavy Metal Removal from Acid Mine Drainage 679 691 2519 10.22044/jme.2022.12090.2205 EN Afrodita Zendelska Faculty of Natural and Technical Sciences, Goce Delchev University, Shtip, Republic of North Macedonia Adrijana Trajanova Mine Bucim, Radovish, Republic of North Macedonia Mirjana Golomeova Faculty of Natural and Technical Sciences, Goce Delchev University, Shtip, Republic of North Macedonia Blagoj Golomeov Faculty of Natural and Technical Sciences, Goce Delchev University, Shtip, Republic of North Macedonia Dejan Mirakovski Faculty of Natural and Technical Sciences, Goce Delchev University, Shtip, Republic of North Macedonia Nikolinka Doneva Faculty of Natural and Technical Sciences, Goce Delchev University, Shtip, Republic of North Macedonia 0000-0001-9578-5979 Marija Hadzi-Nikolova Faculty of Natural and Technical Sciences, Goce Delchev University, Shtip, Republic of North Macedonia Journal Article 2022 07 09 The treatment of acid mine drainages is usually based on two basic technologies, active and passive treatment technologies. Whichever acid mine drainage (AMD) treatment method is employed, a neutralizing procedure that raises the water's pH over 7.0 using alkaline agents is required prior to discharge. A comparison of eight different agents (BaCO₃, Na₂CO₃, NaOH, KOH, K₂CO₃, MgO, CaCO₃, and Ba(OH)₂) was performed in order to choose the most effective neutralizing agent for acid mine drainage treatment. The experiments were performed using a multi-component synthetic aqueous solution with an initial concentration of 10 mg/L of the Cu, Mn, Zn, Fe, and Pb ions and an initial pH value of 1.9. According to the research, the most effective neutralizing agent for the removal of heavy metals from a multi-component aqueous solution is MgO, while the least effective agent was Na₂CO₃. The obtained series of effective neutralizing agents for the removal of heavy metals from a multi-component aqueous solution are presented in the work. The effect of the studied concentration of neutralizing agents depends on the neutralizing agents and heavy metals that are used. The percentage of heavy metals removed from aqueous solutions increases along with rising pH values. The consumption of the neutralizing agent decreases as the concentration of the neutralizing agent is increased. In addition, the time taken to achieve pH depends on the agent concentration. In particular, as the concentration of the neutralizing agent increases, the time to reach the pH decreases. https://jme.shahroodut.ac.ir/article_2519_cff05d652840908e5ad21bec8728c5cf.pdf