Volumetric Assessment of Leachate from Solid Waste Using 2D and 3D Electrical Resistivity Imaging

Abstract:

This paper presents an approach to estimate volume of leachate from municipal solid waste using 2D and 3D electrical resistivity imaging. This process is a deviation from Water Balance Method (WBM) that is commonly used for leachate quantification at landfill sites. While the WBM emphasis is on generating rate, this geophysical approach estimates the in-situ total quantity of leachate. Five 100m profiles were used to generate five 2D inverted pseudo-sections and a 3D inverted section using RES2DINV and RES3DINV programs respectively. The resistivity of inverted pseudo-sections clearly delineated the contaminant leachate plume (ρ < 5 Ωm), which facilitated its volume estimation. The effective porosity values of clay (0.15) and sand/gravel (0.28) deduced from lithology logs were used in calculating the imaged volume of the leachate. To confirm the measured resistivity variation in the saturated subsurface around the dumpsite, in-situ electrical conductivity values of 1782 μS/cm and 4521 μS/cm were determined for uncontaminated and contaminated zones respectively. A total leachate volume of 2.21 x 10³ was estimated for the 1600 survey area.

• Periodical: Advanced Materials Research (Volumes 726-731)
• Pages: 3014-3022
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.726-731.3014
• Online since: August 2013
• Authors: Abdullahi Abdulrahman, Mohd Nordin Mohd Nawawi, Rosli Saad, Kola Abdul Nafiu Adiat
• Keywords: 2D, 3D, Effective Porosity, Electrical Resistivity Imaging, Landfill, Leachate, Water Balance Method

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