Evaluation and optimization of Solidification/Stabilization treatment of the exhausted oil- based drilling sludge (Southern Tunisia)

D. Louati, M. Choura


Solidification/Stabilization treatment of the exhausted oil-based drilling sludge using hydraulic binders, followed by a compaction at the paste phase, was used to reduce the mobility of the pollutants while improving the physical properties of the sludge. The treatment involved mixing the exhausted sludge with required quantities of hydraulic binders such as: Portland artificial cement, air quicklime and water, corresponding to the formulations tested. The obtained smooth paste was subjected to the compaction tests using a triaxial press for the production of standard specimens, in which, leaching tests, chemical analysis and compressive strength measurements were carried out after 30, 60 and 90 days curing. Results revealed that the compaction at the paste phase resulted in optimizing the amount of hydraulic binders and water and improving the retention capacity of pollutants in a cementing matrix compared to previous works. Furthermore, it led to the improvement of the mechanical properties of the stabilized/solidified sludge.


Oil-based drilling sludge; Compaction; Hydraulic binders; leaching tests; Compressive strength.

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