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The consolidation properties of a dewatered municipal sewage sludge were studied using the oedometer, hydraulic consolidation cell, and triaxial apparatus. Bioactive and stabilized test specimens of dried-compacted material and slurry material at different states of biodegradation (LOI = 5570%, where LOI is the loss on ignition) were consolidated under applied stresses of 3400 kPa. The rate of biogas production and the resulting pore pressure response of the unsaturated material were also studied for different specimen drainage conditions. The sludge material largely consisted of organic clay-sized particles, and although highly compressible, the material was practically impermeable (k = 1091011 m/s for slurry material, where k is the coefficient of permeability). Primary consolidation generally constituted only a small part of the overall deformation response for moderately degraded material (LOI 70%). Secondary compression was dominant, and for the bioactive material, included a significant contrib...

Consolidation properties of a dewatered municipal sewage sludge