Studi Hidrogeokimia Kualitas Air Tanah pada Kawasan Permukiman Sekitaran Tpa Terjun, Kecamatan Medan Marelan, Kota Medan, Provinsi Sumatera Utara

Abstract

Open dumping is the type of landfill used in Terjun landfill, Medan Marelan subdistrict, North Sumatra province. This type of landfill has a high potential for pollution to the environment, especially in groundwater quality. This study aims to determine the quality of groundwater in the Terjun landfill area and its hydrogeochemistry. The methods proposed in this research are Trilinier Piper Diagram Analysis (1944), Stiff Quadrangle Diagram Analysis (1951) and Durov Diagram Analysis (1984). The elements analyzed include Calcium (Ca2+), Sodium (Na+), Magnesium (Mg2+), Potassium (K+), Chloride (Cl-), Bicarbonate (HCO3 -) and Sulfate (SO4 2-). The results contained in the electrical conductivity value ranged from 100-1100 micromhos/cm indicating the classification of the water as fresh water. Analysis of the major ion test results of each sample using the three methods shows that with the Stiff diagram method, the dominant ion content in the borehole groundwater is Cl- ions in borehole 1 and HCO3- ions in other boreholes. In the Piper diagram, it can be determined that the facies or type of borehole groundwater that has been tested is Ca2+-HCO3 -. Then the Durov diagram can be seen the process that occurs in groundwater, namely the simple dissolution or mixing process. When looking at the results of the major ion test, sample point 1 has a high level of Cl- ions influenced by leachate water and a fairly close distance to the landfill.