STUDY OF EFFECTIVENESS OF USING OPEN LIMESTONE CHANNEL WITH ZEOLITE ADDITION IN PASSIVE TREATMENT OF ACID MINE DRAINAGE ON LABORATORY SCALE
Acid Mine Drainage (AMD) is one of the problems in mining activity. Management of acid mine drainage is important to be carried out during mining activity and after mine closure to ensure the quality of effluent water from mining. One method of AMD treatment has been widely used is the passive tr...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/70726 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Acid Mine Drainage (AMD) is one of the problems in mining activity. Management
of acid mine drainage is important to be carried out during mining activity and
after mine closure to ensure the quality of effluent water from mining. One method
of AMD treatment has been widely used is the passive treatment using Open
Limestone Channel (OLC). However, in this system there is concern about the iron
oxide layer on limestone surface, which could inhibit further dissolution and caused
the system failure. Therefor it is necessary to modify an OLC system to reduce iron
oxide deposition and increase the effectiveness of the system. In this research,
zeolite was used as ion exchanger and expected to reduce pollutants from AMD
especially iron ions which would cause armoring on limestone surface.
In this study, zeolite control simulations were carried out wuth three channel
models, and OLC simulations with six channel models. The simulation used PVC
pipe with total length of 200 cm and diameter of 10,16 cm, which was flowed by
synthetic acid mine drainage with pH of 2.5 and dissolved metal concentration of
14 mg/L for Fe, 6 mg/L for Mn, and 4.5 mg/L for Al. Based on simulation, zeolite
could increase acid neutralization and reduce dissolved metal concentration.
Addition of zeolite at the beginning of the LKZ channel could increase pH of 8.15
at the beginning and 7.26 at the end simulation. Metal removal in this channel
reached 100% for Fe, 41.2 – 90.6% for Mn, and 100% for Al.
In this study, precipitate on the limestone surface was analyzed using SEM-EDS
analysis. The results showed that the presence of iron oxide was much less in OLC
with zeolite addition. Furthermore, based on modeling using PHREEQC software,
it showed that the dominant mineral precipitated on limestone surface was goethite
(FeOOH). The amount was also verified to be less in OLC with zeolite addition. |
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