Abstract
This paper presents the results of a comprehensive geotechnical laboratory testing for the assessment and design of a proposed biosolid monofill facility at the As-Samra Waste Water Treatment Plant (WWTP) in Jordan. Previous landfill operations for biosolid materials typically involved co-disposal or lagooning of the dewatered biosolid slurry. However, it is proposed that the solar-dried As-Samra WWTP biosolid material will be placed in a new monofill facility at the site. This approach is suited to the As-Samra desert climate, since the material’s water content can be readily reduced to between 60 and 100% in evaporation lagoons. New insights were gained on the strength and compressibility of the non-inundated and saturated compacted biosolid materials, including their (a) very low normalised undrained strength ratio and effective angle of shearing resistance values for the saturated normally consolidated states of 0·14 and 15°, respectively; (b) very high strain rate dependency of strength; and (c) extremely low permeability coefficient values on the order of 10−12 m/s for compaction at approximately 100% water content. The paper concludes with recommendations on the appropriate water content range for compaction of the material in the proposed monofill and the selection of design strength values for geotechnical stability analysis.
Highlights
IntroductionBiosolid (sewage sludge) material is the residue by-product of wastewater treatment processes
Biosolid material is the residue by-product of wastewater treatment processes
The N value measured for the sampled biosolid material at the As-Samra Waste Water Treatment Plant (WWTP) facility ranged 63·0–64·8%, compared to 62·6% measured for the same material tested at the geotechnical laboratory in the USA
Summary
Biosolid (sewage sludge) material is the residue by-product of wastewater treatment processes. The background to the present investigation was to facilitate the development of a large biosolid disposal facility at the site of the As-Samra Waste Water Treatment Plant (WWTP), located in the Hashemite Kingdom of Jordan, for the purposes of providing an environmentally sensitive and protective means for the disposal and management of the biosolid material produced from this treatment plant for a targeted minimum 20-year period. The caked solids are stored and allowed to solar dry in lined lagoons for approximately 2–3 months in order to reduce the gravimetric water content value (w, in per cent) to approximately 100% (the value of the solids content (Sc in per cent), normally used in environmental engineering, can be determined from the water content value as
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