Model 3D Sebaran Lindi pada Lapisan Tanah di Area TPA Batulayang Pontianak Berdasarkan Nilai Resistivitas

Abstract

The Final Disposal Site (TPA) of Batulayang Pontianak, West Kalimantan, uses an open dumping system so that it produces waste water (leachate). Its area on peatlands creates problems, especially in the distribution of leachate. The purpose of this study was to create a 3D model of leachate distribution in the soil layer in the TPA area of Pontianak Batulayang, West Kalimantan, based on the distribution of resistivity values. This study using the geoelectric resistivity method by the Wenner-Schlumberger configuration. The tracks that have been used are six, having a length of 117 m each. The results showed that the soil layer contaminated by leachate spreads from a depth of 5 m to 23.6 m. This layer is interpreted as sandy clay and sand, having a resistivity value of 0.152 Ωm to 13 Ωm. The results also showed that leachate comes from the West, North, and South directions, which spread to all study areas.

Two-Dimensional Modeling of Leachate Distribution in Batu Layang Landfill on Peat Soil using Geoelectric Method

“…The depth of peat soil in Batu Layang landfill was estimated to be up to 4.5 m below the soil surface (Muhardi et al, 2020). Peat soil contains organic matter (Muhardi et al, 2020). The peat soil color was yellow to dark brown.…”

“…Peat soil has a high porosity value (Sampurno et al, 2018). Peat soils have high porosity and permeability, so they are water-saturated (Muhardi et al, 2020;Zulkifley et al, 2013). Peat soils saturated with water can make it easier for leachate to fill pore spaces and contaminate groundwater around the landfill, causing groundwater to mix with leachate (Muhardi et al, 2020).…”

“…Peat soils have high porosity and permeability, so they are water-saturated (Muhardi et al, 2020;Zulkifley et al, 2013). Peat soils saturated with water can make it easier for leachate to fill pore spaces and contaminate groundwater around the landfill, causing groundwater to mix with leachate (Muhardi et al, 2020). Peat soil has a permeability value of 2.97×10 -5 -8.31×10 -5 m/s, porosity of 83.43-92.92%, and bulk density of 0.16 -0.31 g/cm 3 (Jakarius et al, 2021).…”

“…The resistivity value of 1.19-13.3 Ωm was interpreted as peat soil. The estimation of the resistivity value was supported by the research ofMuhardi et al (2020). The depth of peat soil was up to 4.5 m below the surface(Muliadi et al, 2019).…”

“…The resistivity value of 0.5-10.2 Ωm was identified as leachate-contaminated soil. It was supported by the research ofMuhardi et al (2019) (Muhardi et al, 2020), which states value estimation. Leachate contaminated soil resistivity of 0.152-13.3 Ωm.…”