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Gas collection system design for a landfill via three-dimensional stochastic waste heterogeneity models and kriging

T G, P and K M, N and P K, D and G L, SB and T K K, CD (2023) Gas collection system design for a landfill via three-dimensional stochastic waste heterogeneity models and kriging. In: Journal of Environmental Chemical Engineering, 11 (5).

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Official URL: https://doi.org/10.1016/j.jece.2023.110563


Installation of a gas collection system (GCS) at a landfill helps extract gas for domestic usage, alongside minimizing greenhouse gas emissions. To maximize the efficiency of gas extraction, it is important but challenging to design a GCS by modelling the three-dimensional, multiphase, multicomponent gas migration in a landfill, incorporating spatio-temporal variabilities in the geotechnical properties of the waste (viz., heterogeneity) and uncertainties (via stochastic models). This work proposes a method to calculate the radius of influence (ROI) of a gas extraction well (GEW) and designs a GCS for an actual landfill. The method models three-dimensional gas migration in a landfill via TOUGH simulator. Geotechnical properties are estimated using stochastic models to calibrate the simulator and obtain the gas flows at specific spatio-temporal locations. Gas flow values at the remaining locations are obtained through Kriging, based on which ROI is calculated. To ensure gas collection from the entire area of the landfill, 36 GEWs are placed. The spacing between GEWs is consistent with certain prevailing heuristic guidelines, and this work provides a justification for their use. A gas recovery efficiency of 0.82 and gas pressure of 103 kPa are achieved for a passive GCS under heterogeneity. A homogeneous design only yields an efficiency of 0.56, exemplifying the utility of the heterogeneous model. For an active GCS, the efficiency is found to be improved to 0.86. The framework provided in this work can be used for accurate gas flow estimation in large landfills, and design safe GCS ensuring minimal methane emission.

Item Type: Journal Article
Publication: Journal of Environmental Chemical Engineering
Publisher: Elsevier Ltd
Additional Information: The copyright for this article belongs to the Elsevier Ltd.
Keywords: Air intrusion; Greenhouse gas emission; Kriging surrogate modelling; Landfill gas collection system; Radius of influence; Waste heterogeneity
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Division of Mechanical Sciences > Civil Engineering
Date Deposited: 27 Nov 2023 09:39
Last Modified: 27 Nov 2023 09:39
URI: https://eprints.iisc.ac.in/id/eprint/82884

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