Influence of hydraulic conductivity and moisture retention characteristics of waste on the performance of leachate recirculation system
By: Sughosh, P
.
Contributor(s): Lakshmikanthan, P.
Publisher: USA Springer 2023Edition: Vol.53(1), Feb.Description: 93-106p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian geotechnical journalSummary: 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 | Current location | Call number | Status | Date due | Barcode | Item holds |
|---|---|---|---|---|---|---|
Articles Abstract Database
|
School of Engineering & Technology (PG) Archieval Section | Not for loan | 2023-1317 |
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.
Click on an image to view it in the image viewer
There are no comments for this item.