An Eco-Innovative Solution for Reuse of Leachate Chemical Precipitation Sludge: Application to Sanitary Landfill Coverage
 
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1
Institute of Engineering, National Autonomous University of Mexico, Circuito Escolar s/n, Ciudad Universitaria, Delegación Coyoacán, Mexico City 04510, Mexico
2
FibEnTech/UBI-Fiber Materials and Environmental Technologies Research Unit, Universidade da Beira Interior, 6201-001 Covilhã, Portugal
3
Department of Technology and Applied Sciences, School of Agriculture, Polytechnic Institute of Beja, 7800-295 Beja, Portugal
4
FibEnTech/UBI-Fiber Materials and Environmental Technologies Research Unit, Universidade da Beira Interior, 6201-001 Covilhã, Portugal
CORRESPONDING AUTHOR
Annabel Fernandes   

FibEnTech/UBI-Fiber Materials and Environmental Technologies Research Unit, Universidade da Beira Interior, 6201-001 Covilhã, Portugal
Publication date: 2021-03-01
 
Ecol. Eng. Environ. Technol. 2021; 2:52–58
 
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ABSTRACT
Sanitary landfill leachate was treated by chemical precipitation and the potential use of mixtures of the chemical precipitation sludge (CPS) generated and natural soil to cover the solid waste at sanitary landfills was evaluated. Tests were performed with soils having 0, 5 and 10% CPS, and the organic matter, pH, compaction, hydraulic conductivity, particle-size, liquid limit, plastic limit, and plasticity index were determined. It was found that leaching increased with CPS concentration, as well as the fine particles content in the soil, which reduced the hydraulic conductivity. pH was the most affected parameter, with values of 7.03, 7.12, and 11.46 for 0, 5 and 10% CPS, respectively. However, at 5% CPS, biodegradability was favored without a significant increase in the leaching process, showing that CPS can be used as temporary cover material, without adversely affecting the landfill system, being an eco-innovative solution for the final disposal of the sludge.