Abstract
Acid mine drainage (AMD) has characteristic very low pH solution and containing metal ions in high concentration. This paper presents the use of CaCO 3 , Ca(OH) 2 and the combination of both to increase the pH and decreased the concentration of Fe and Mn ions for acid mine drainage. The research variables are the effect of reactant dosage, contact time and temperature by batch studies. The AMD before treatment has pH solution of 3.38, Fe and Mn ions concentration of 44.6 and 7.19 mg/L, respectively. The dosage of CaCO 3 to increased pH solution about 7.0 was found 2400 mg/L at contact time 60 minutes and temperature 40 °C. The amount of Ca(OH) 2 for the neutralization of AMD solution smaller than CaCO 3 is 210 mg/L at contact time 45 minutes and temperature 40 °C. The combination dosage of CaCO 3 1000 mg/L and Ca(OH) 2 90 mg/L can increased the pH of AMD solution to 7.10 and reduction concentration of Fe to 3.53 and Mn to 4.51 mg/L. Therefore, the integrated of CaCO 3 and Ca(OH) 2 has the potential to be applied to treatment acid mine drainage.
Highlights
Acid mine drainage (AMD) is an important problem in the environment and a serious concern in many countries
The AMD contains of heavy metal from the oxidation of sulphidic minerals and producing low of pH solution
The treatment of AMD must be done on the exhaust into the environment because this substance is harmful to aquatic life at low concentration, not biodegradable and media surroundings
Summary
Acid mine drainage (AMD) is an important problem in the environment and a serious concern in many countries. The method is often used for AMD treatment is oxidation, coagulation/flocculation, neutralization and precipitation of metal ions. The other research, effect neutralization of AMD with limestone in the reactor during 48 hours produced an armor coating in the bottom [6]. It causes the decline in the effectiveness of the use of CaCO3. The other research, the use of CaCO3 on AMD treatment can increase the pH solution from 2.9 to over 7 at the contact time of 48 hours [6]. The combination of CaCO3 and Ca(OH) to treatment of AMD 2 is expected to increase the pH and reduction the heavy metal ions at the faster contact time. The parameters of studied are the effect of reactant dosage, contact time and temperature by batch studies
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