STUDY OF WASTEDUMP EROSION CONTROL AT COAL MINING (Case: Catchment Area SP-9C PT. Adaro Indonesia - Kalimantan Selatan)

• Main Author: IASHANIA (NIM : 22115023), YUNIDA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31836
• Institution: Institut Teknologi Bandung

Wastedump area is an open area mine without revegetation which can cause high erosion. <br /> <br /> Rain and runoff cause erosion and the increase of sedimentation in the settling pond causes <br /> <br /> the capacity of the sediment pond to decrease. This research was conducted at PT Adaro <br /> <br /> Indonesia, located in the area of wastedump that is catchment area DTH SP 9C. This study <br /> <br /> aims to reduce the erosion and environmental burden, therefore, it is necessary to assess <br /> <br /> erosion control and determine the prediction of erosion rate in the conditions of active heap <br /> <br /> areas. The prediction of erosion rate is influenced by rainfall erosivity using equations <br /> <br /> developed by Bols, Utomo, Foster and Williams and analyzes the material properties found on <br /> <br /> embankment based on the development of USLE (Universal Soil Loss Equation) method. <br /> <br /> The actual erosion occurring in DTH SP 9C in 2015 amounted to 461,829 tons/year and in <br /> <br /> 2016 amounted to 742,759 tons/year. The amount of erosion transported by the water flow is <br /> <br /> obtained from the measurement of water quality (TSS) and rainfall so that the equation Y = <br /> <br /> 333,03 x + 554,49. There were a prediction result surface erosion loads that transport sediment <br /> <br /> material due to runoff through the approach of accumulated TSS expression of daily sediment <br /> <br /> discharge in 2015 amounted to 518,395 tons / year and 2016 of 752,244 tons / year. The <br /> <br /> prediction of erosion based on the USLE method with the criteria approaching actual erosion <br /> <br /> is using the Bols equation of 2015 with (K = 0,25) of 1,222.37 ton / ha / year and year 2016 <br /> <br /> with (K = 0,30) 1,788,91 ton / ha / year. <br /> <br /> Based on the active condition of wastedump that occurred in 2015 and 2016, the erosion was <br /> <br /> very high so that erosion control efforts were needed, by applying the overburden to the design <br /> <br /> that had been made. Erosion control eforts for overburden such as; control erosion and water <br /> <br /> management (drainage system improvement, drop structure creation, sediment trap), and <br /> <br /> maintenance of a sediment pond (Safety pond). <br />