| Title | A Novel Technosol Formulation for Sustainable Landfill Top Covers Using Non-Hazardous Wastes |
|---|---|
| ID_Doc | 26553 |
| Authors | Fernández-Caliani, JC; Alvarez-Lozano, J; García-Navarro, E; Fernández-Landero, S; Cantero, C; Giráldez, MI |
| Title | A Novel Technosol Formulation for Sustainable Landfill Top Covers Using Non-Hazardous Wastes |
| Year | 2024 |
| Published | Applied Sciences-Basel, 14, 14 |
| Abstract | This study explores the potential of non-hazardous wastes for crafting an engineered soil-like material (Technosol) suitable for landfill capping applications. Three distinct materials-waste foundry sand (WFS), washing aggregate sludge (WAS), and composted biosolids (CBS)-were strategically combined to develop this innovative Technosol. The formulation process involved a comprehensive analysis of their physical-chemical properties, mineral composition, leachate quality, and a series of geotechnical assessments to ensure compliance with landfill top cover construction standards. The blend 90WFS/10WAS showed optimal geotechnical properties for constructing a protective layer, including maximum dry density (1.77 g cm-3), void ratio (0.4), CBR index (23.2), cohesive strength (40 kPa), internal friction (phi = 30 degrees), and permeability coefficient (k = 1.48 x 10-6 cm s-1). Further enhancement was achieved by adding 10% CBS, resulting in the development of a functional organo-mineral topsoil horizon (81WFS/9WAS/10CBS). Importantly, leachate analysis confirmed the negligible environmental footprint of this Technosol. Moreover, a pot-based experiment with Brassica juncea planting validated its capacity to support plant growth and establish a vegetative cover on the landfill surface. |
| https://www.mdpi.com/2076-3417/14/14/6166/pdf?version=1721120657 |
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