Laboratory device to characterize electrokinetic geocomposites for fluid fine tailings dewatering

Author:

Bourgès-Gastaud Sébastien12,Stoltz Guillaume2,Dolez Patricia3,Blond Éric3,Touze-Foltz Nathalie2

Affiliation:

1. Afitex, 13-15, rue Blériot, 28300 Champhol, France.

2. Irstea, HBAN, INEGE, 1, rue Pierre-Gilles de Gennes, 92761 Antony Cedex, France.

3. CTT Group, Sageos, 3000 avenue Boullé, Saint-Hyacinthe, QC J2S 1H9, Canada.

Abstract

The oil sands industry usually leads to the production of large quantities of mineral waste, such as fluid fine tailings (FFT), whose disposal is often challenging. Electrokinetic geocomposites (eGCPs) installed into the FFT disposal area may improve in situ dewatering, as eGCPs can drain water expulsed during FFT consolidation as well as impose a voltage across FFT to displace water by electro-osmosis. This paper presents a laboratory device specifically developed to evaluate eGCP performance for sludge dewatering. Based on the oedometer principle, the device aims at studying sludge consolidation as a function of boundary conditions (mechanical stress and (or) voltage), with drainage and electrical conduction ensured by two eGCPs positioned on both sides of the sludge layer. Preliminary results obtained with one particular eGCP are presented: the solids content was increased from 42% to 66%, which led to a significant improvement of the shear strength from nearly 0 kPa to a mean value of 40 kPa. The energy required for this experiment was 71 W·h (3.5 kW·h/(m3 of sludge)). The filtration performance remained satisfactory; the sludge particles were retained upstream of the filter, with clean water flowing through.

Publisher

Canadian Science Publishing

Subject

Civil and Structural Engineering,Geotechnical Engineering and Engineering Geology

Reference55 articles.

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2. Arab, R., Cherifi, F., and Loudjani, F. 2009. Landfill drainage with geocomposites. Colloque internationnal sols non saturés et environnement, Tiemcem, Algeria.

3. ASTM. 2004. Standard test methods for one-dimensional consolidation properties of soils using incremental loading. ASTM standard D2435-04. American Society for Testing and Materials (ASTM), West Conshohocken, Pa.

4. Test Method for Measuring Mass per Unit Area of Geotextiles

5. Test Method for Measuring the Nominal Thickness of Geosynthetics

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