Stability Of Slopes Of Municipal Solid Waste
Landfills With Co-disposal Of Biosolids
Author(s)
M. Chopra, D. Reinhart, M. Vajirkar & B. Koodhathinkal
Abstract
This paper deals with the impact of the addition of biosolids on the geotechnical
properties of class I landfills with Municipal Solid Waste (MSW). The properties
are estimated from a field exploration program using the Cone Penetration Test
(CPT). The geotechnical shear strength parameters (angle of internal friction and
cohesion) of MSW and biosolids mixture are estimated by correlation with the
CPT results. These parameters are then used to study the impact of the addition
of biosolids on the stability of the slope of the landfill. The slope stability
analysis is conducted on various landfill models using the software SLOPE/W.
The waste is assumed to act similar to a cohesionless soil. Based on the field
explorations, the angle of internal friction was found to be about 29°. Previous
research indicated that the most suitable approach to introducing biosolids into
the landfill was in the form of trenches. From the slope stability analysis, it was
found that the factor of safety reduces significantly with the introduction of
biosolids due to a reduction in the shear strength and with increase in the overall
moisture content.
Keywords: landfills, biosolids, slope stability analysis, cone penetrometer.
1 Introduction
Landfills are well engineered facilities that are used for disposal of Municipal
Solid Waste (MSW) and are located, designed, monitored, operated and financed
to ensure compliance with federal regulations. Disposal of water treatment
facility sludge and wastewater treatment facility biosolids presents significant
challenges to facility operators, as this practice often violates loading of metals
and exceeds the allowable levels of pathogens for land application. Thus,
Keywords
landfills, biosolids, slope stability analysis, cone penetrometer.
Related Book
Other papers in this volume
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