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Gas Diffusivity Based Characterization of Stabilized Solid Waste from Kurunegala Open Dump Disposal Site

Shanujah, M and Chamindu Deepagoda, TKK and Nasvi, MCM and Karunarathna, AK and Shreedharan, V and Babu, GLS (2020) Gas Diffusivity Based Characterization of Stabilized Solid Waste from Kurunegala Open Dump Disposal Site. In: Lecture Notes in Civil Engineering, 13-14 December 2019, Kandy; Sri Lanka, pp. 99-109.

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Official URL: https://dx.doi.org/10.1007/978-981-15-7222-7_9


Open dumps are complex ecosystems with respect to Greenhouse Gas (GHG) emission which occurs as a consequence of anaerobic decomposition of organic substances typically available in Municipal Solid Waste (MSW). Subsurface soil conditions (e.g. soil texture, structure) and atmospheric boundary conditions (e.g. wind, temperature) are the major key factors which affect the water retention characteristics, gas diffusivity, and hence the subsurface transport of GHGs. In this study, we characterized the stabilized �soil-like� fraction sampled from an open dumpsite located in Kurunegala, Sri Lanka to investigate subsurface landfill gas (CO2) transport behaviour. The MSW, collected at 2.5�5 m depth was screened to separate the stabilized �soil-like� fractions and proportioned into two groups (0�4.75 mm, 4.75�9.5 mm) for the particle-size based characterization. Soil-gas diffusivity (Dp/Do, where Dp and Do are gas diffusion coefficients in soil air and free air, respectively) and soil�water characteristic (SWC) of the stabilized waste were measured and parameterized using existing and modified parametric models. The results revealed that the investigated material exhibited two-region porosity (i.e., inter-aggregate pore region and intra-aggregate pore regions) which, in turn, affected the water retention and gas transport properties. We further experimentally investigated CO2 gas transport originated from a point source buried in medium bench-scale emission tank under the dry condition and the observed subsurface methane profiles were simulated using the multiphase transport simulator TOUGH2-EOS7CA. In addition, potential effects of atmospheric boundary controls, wind (1.5 and 3 ms�1) and temperature (26 and 34 °C), were also examined based on a series of controlled bench-scale experiments using bench-scale emission tank interfaced with a wind tunnel at the dry condition. Results showed the pronounced effects of particle size and wind and, to a lesser degree, of temperature on soil-landfill gas migration. © 2021, Springer Nature Singapore Pte Ltd.

Item Type: Conference Paper
Publication: Lecture Notes in Civil Engineering
Publisher: Springer Science and Business Media Deutschland GmbH
Additional Information: cited By 0; Conference of 10th International Conference on Structural Engineering and Construction Management, ICSECM 2019 ; Conference Date: 13 December 2019 Through 14 December 2019; Conference Code:249079
Keywords: Aggregates; Atmospheric movements; Atmospheric structure; Atmospheric temperature; Biogas; Carbon dioxide; Diffusion; Greenhouse gases; Land fill; Particle size; Project management; Soils; Structural design; Tanks (containers); Textures; Wind tunnels, Anaerobic decomposition; Atmospheric boundary conditions; Bench scale experiments; Gas transport properties; Landfill gas migration; Municipal solid waste (MSW); Subsurface soil conditions; Water retention characteristics, Municipal solid waste
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 24 Dec 2020 10:18
Last Modified: 24 Dec 2020 10:18
URI: http://eprints.iisc.ac.in/id/eprint/66885

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