ANALYSIS OF DEUTERIUM (?2H) AND OXYGEN-18 (?18O) TO TRACE GROUNDWATER CONTAMINATION AROUND SARIMUKTI SANITARY LANDFILL

• Main Author: Aprilia Triyadi, Riska
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/53492
• Institution: Institut Teknologi Bandung

Sarimukti sanitary landfill is a landfill built by the local government as a replacement for the Leuwigajah sanitary landfill, which experienced landslides. The composition of the waste disposed at the Sarimukti sanitary landfill is very diverse. The wastes may contain inorganic and organic chemicals that can harm humans if present in high concentrations. These chemicals are carried by leachates, which move down through rocks that underlie this landfill, and thus it can contaminate groundwater. The analysis of stable isotope of deuterium (?2H) and oxygen-18 (?18O), which is supported by the chemical data of groundwater, can be used to know the water source; thus, it can be known with what materials the water mixed and what processes had happened. This research was conducted by geological and hydrogeological mapping. Eight water samples were taken to be used in ion chromatography, deuterium (?2H) and oxygen-18 (?18O) isotopes analysis. The rock around the landfill consists of three units, from the oldest to the youngest: Interbedded Claystone-Sandstone Unit, Tuff Unit, and Volcanic Breccia Unit. The Interbedded Claystone-Sandstone Unit is thought to act as an aquitard. The Tuff Unit is also thought to act as an aquitard, while Volcanic Breccia Unit is thought to act as an aquifer. Ion chromatography (IC) analysis showed that the concentrations of Cl-, NO2 -, HCO3 -, Na+, and NH4 + exceeded the limit values of Permenkes RI No. 492/MENKES/ PER/IV/2010. This can be due to the interaction of groundwater with pollutants around the study area, such as landfill waste, household waste, or fertilizer used on agricultural land. The result of stable isotope analysis indicates a mixture of leachate and groundwater in the study area. This is shown by the isotope values of A5, SW2, SW4, and SP2 samples which are between the uncontaminated groundwater (SP1) and leachates water and far from the LMWL line. The calculation of the mixing ratio was also carried out in this study. The result is 2.56% leachate mixed with groundwater.