Influence of Hydraulic Conductivity and Moisture Retention Characteristics of Waste on the Performance of Leachate Recirculation System

Sughosh, P and Lakshmikanthan, P and Vibha, S and Sivakumar Babu, GL (2022) Influence of Hydraulic Conductivity and Moisture Retention Characteristics of Waste on the Performance of Leachate Recirculation System. In: Indian Geotechnical Journal .

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Abstract

Recirculation of leachate in bioreactor landfills accelerates the waste stabilization process. Due to biodegradation-induced changes in waste density, the waste parameters such as hydraulic conductivity and moisture retention characteristics (MRCs) evolve continuously within the landfill. In this study, an approach to evaluate the temporal variations of the hydraulic conductivity and MRC of waste is proposed, which is then used to simulate the changes in the hydraulic performance (wetted width, flow rate and injection pressure) of the leachate recirculation system. Simulations were carried out for ten years to demonstrate the effect of flow rate and pressure head on the propagation of the saturation contours within the landfill. The results indicate that for a constant flow rate, the wetted width and pressure head increase with the age of landfill. It also shows that the operational costs incurred due to the pumping of leachate can be decreased by reducing the flow rate gradually with time without reducing the wetted width. The implications of the study are demonstrated by considering a liquid injection system design for a landfill of one-hectare area.

Item Type:	Journal Article
Publication:	Indian Geotechnical Journal
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer.
Keywords:	Biodegradation; Flow rate; Leachate treatment; Moisture; Wetting, 2D simulations; HYDRUS-2D; Hydrus-2d simulation; Leachate recirculation; Moisture retention; Pressure heads; Property; Retention characteristics; Unsaturated property; Wetted width, Hydraulic conductivity
Department/Centre:	Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA) Division of Mechanical Sciences > Civil Engineering
Date Deposited:	05 Oct 2022 09:49
Last Modified:	05 Oct 2022 09:49
URI:	https://eprints.iisc.ac.in/id/eprint/77065

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