Summary: 57ième CONGRÈS CANADIEN DE GÉOTECHNIQUE 57TH CANADIAN GEOTECHNICAL CONFERENCE
5ième CONGRÈS CONJOINT SCG/AIH-CNN 5TH JOINT CGS/IAH-CNC CONFERENCE
A NEW TESTING SYSTEM TO INVESTIGATE THE SEDIMENTATION
AND CONSOLIDATION OF SLUDGE AND SLURRY
Jean-Baptiste Dromer, Mineral Eng., Dept. CGM, École Polytechnique de Montréal.
Michel Aubertin, Mineral Eng. Dept., CGM, École Polytechnique de Montréal.
Greg Kennedy, Eng. Physics Dept., École Polytechnique de Montréal.
Lincar Pedroni, Mineral Eng., Dept. CGM, École Polytechnique de Montréal.
Bruno Bussière, UER Sciences Appliquées, Université du Québec en Abitibi-Témiscamingue.
A system has been developed to study in the laboratory the sedimentation and consolidation of slurry and sludge (pulp).
It makes use of a relatively large size column (about 2 meters high) in which the pulp is placed as a suspension at a
representative density. The stages of sedimentation and hydrodynamic consolidation are followed with visual
observation of the solid-liquid interface, and with measurements of density and pore pressure u. The instrumented
column is equipped with pressure transducers that continuously measure u at 10 cm intervals during tests that can last a
few weeks. A device has also been constructed so the change in density can be monitored with a gamma ray sensor
unit. The tests include stages for self-weight consolidation and forced consolidation following the application of external
loads. After recalling the physical processes involved, and some equations used for their description, the experimental
set-up is described, and sample results obtained on acid mine drainage treatment sludge are given and briefly discussed.