Acid mine drainage has been reported to cause various environmental and human health problems. Acid mine drainage is formed due to the oxidation of sulfide minerals to water and air. This paper reports the efforts that have been made in the management and treatment of acid mine drainage. Thirty papers from reputable publishers are used as references. Efforts to prevent the formation of acid mine drainage can be made by making proper drainage and dewatering systems, making non-acid formations for rocks that have the potential to be oxidized. Active and passive treatment methods can be used to treat acid mine drainage. The active treatment method uses materials and chemicals to reduce pollutant parameters, while the passive method utilizes natural processes to reduce pollutant parameters in acid mine drainage. The combination of active and passive methods using novel materials that have been researched is recommended to produce the best system that can thoroughly remove pollutants in acid mine drainage.
The research location is located in Kunjir Village, Rajabasa District, South Lampung. This village is an area that was affected by the tsunami waves due to the eruption of Mount Krakatau in 1883 and the village worst affected by the Krakatoa tsunami on 22 December 2018 in Lampung. This research was conducted to determine tsunami deposits using geoelectrical methods which are correlated with stratigraphic observations and thin section petrographic analysis on river walls in the study area. The geoelectrical method used is Electrical Resistivity Tomography (ERT). The ERT survey was carried out on 1 line located near the river. The purpose of the ERT survey is to determine tsunami deposits. Based on geological observations, it is suspected that there is a tsunami deposit in the form of a layer of sand mixed with pyroclastic and pumice rocks. Based on thin section petrographic analysis, it tends to show a pattern of changes in composition upward following changes in grain size. Based on the pseudo-section of the result of Electrical Resistivity Tomography processing, it is suspected that tsunami deposits were found in sandstone with a resistivity value of 17 - 100 Ωm.
Pengabdian ini bertujuan untuk memperkenalkan tentang konsep dan pemanfaatan koperasi kepada petani jeruk di Kecamatan Gunung Omeh Kabupaten Limapuluh Kota. Metode yang digunakan adalah metode ceramah (penyuluhan) dan pelatihan. Terdapat banyak petani yang belum mengetahui tentang koperasi, tujuan koperasi, manfaat koperasi dan bagaimana proses pembentukan koperasi dan bersedia membentuk panitia pembentukan koperasi. Diharapkan pemerintah bisa membantu pendirian koperasi petani jeruk ini.
The presence of groundwater on the slopes of the mine, which means that the slopes are saturated with water, will cause a decrease in slope stability. Drain hole is a method that can be applied to decrease groundwater level on a mine slope. This research was conducted to determine the effect of horizontal distance between drain holes on the mine slope on the decrease in groundwater level (groundwater drawdown). Groundwater flow simulation on the slopes of an open pit coal mine with 3 scenarios, without drain holes, 100 m horizontal space between drain holes, and 50 m horizontal space between drain holes, was carried out to answer the goal of this research. The results obtained from the simulation, the third scenario with a distance between drain holes of 50 m has the maximum result compared to the other two scenarios, which are the percentage of groundwater drawdown of 54.1% and groundwater discharge of 167.3 L/s. So it can be concluded that the denser the horizontal distance between the drain holes on the mine slope, the higher the groundwater drawdown on the slope.
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