STUDY OF ACID MINE DRAINAGE TREATMENT BY USING CALCIUM AND SODIUM-BASED MATERIALS IN LABORATORY

• Main Author: Saputra (NIM : 12114038), Sadam
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/30757
• Institution: Institut Teknologi Bandung

Acid mine drainage (AMD) is water in mining or quarrying activities that are acidic or have high acidity and are formed as a result of oxidation of sulfide minerals with the presence of water. The source of acidity is sulfide mineral which can be oxidized. The main oxidizing source is oxygen in the air. Water is one of the reactants in the AMD formation process and also as a medium that "cleanses" or dissolves the oxidation results. Water sources can be in the form of rainwater or groundwater runoff. AMD is an important environmental impact of mining activities, both ore and coal mining. The impact of AMD can damage the ecosystem in the mining area and become a post-mining burden if it is not managed properly. The formation of AMD is a result of mining activities that are definitely formed or cannot be completely prevented. Therefore, processing technology is needed for AMD so that it meets environmental quality standards in accordance with the applicable legislation. <br /> <br /> Active processing technology is one system for processing AMD. This technology is suitable to be applied in the exploration and production-operation stages because it requires active control and management by humans of the operation and maintenance of the processing system. In the application of this technology requires neutralizing materials which are generally chemicals. In this study an AMD neutralization test was conducted using calcium and sodium-based neutralizing agents. CaO neutralizer comes from PT BIB's storage stock (near the settling pond) and nursery and control CaO which is used for comparison of the types of black lime, and NaOH. To find out the effective dose of neutralizing material in the AMD sample processing used, titration test and jar test were carried out followed by water quality test (physical test, Induced Coupled Plasma-Mass Spectometry, Ion Chromatography). While the element test (X-Ray Fluoresence) was carried out on neutralizing material samples to determine the basic composition of neutralizing ingredients. <br /> <br /> Based on the initial testing of the AMD sample, it has not met the parameters of pH, Fe, and Mn in the quality standard. Jar test results show that the optimum dose for each neutralizing material for processing AMD samples is CaO (set) 540 mg / L, CaO (nursery) 500 mg / L, CaO (control) 500 mg / L, and NaOH 400 mg / L. With this dose, the neutralizing material needs in the average rainfall condition that produces 4,691,059 m3 / year of water to be processed is 2,786 tons of CaO (setpond), 2,322 tons of CaO (nursery), 2,322 tons of CaO (control), and NaOH 1,857 tons.