Hydrogeotechnical characterization of AMD treatment sludge and sludge-based mixtures

Medard Bouda, Mamert Mbonimpa, Isabelle Demers, Mostafa Benzaazoua, Mario Gagnon

In the proceedings of: GeoManitoba 2012: 65th Canadian Geotechnical Conference

Session: T3B - Mining

ABSTRACT: Acid mine drainage (AMD) is often treated using lime based active treatment, which generates sludge containing mainly precipitates of metal hydroxides, gypsum, and unreacted lime. Different options of sludge management are available, including storage in decantation ponds. Some investigations are being conducted to evaluate the potential use of tailings-, waste rock-, and silty soil-sludge mixtures as dry cover materials for mine site rehabilitation. Thus, the impact of the sludge content in the -mixtures on the chemical stability and hydrogeotechnical properties are studied. This paper presents the effect of sludge content on the grain-size distribution, relative density, saturated hydraulic conductivity, compactibility, and shrinkage behavior of soil-sludge mixtures (SSM). The impact of initial water content of the sludge and soil is also investigated. Results are presented and discussed with regards to the potential use of SSM as a dry cover.

RÉSUMÉ: Le drainage minier acide (DMA) est souvent traitée avec de la chaux, ce qui génère des boues contenant principalement des hydroxydes métalliques précipités, du gypse et de la chaux en excès. Plusieurs options de gestion des boues existent, incluant la déposition dans des bassins de décantation. Des investigations sont en cours pour évaluer la possibilité d'utiliser les mélanges de résidus, de stériles, de sol limoneux avec la boue comme matériaux de recouvrement pour la restauration des sites miniers. À cet égard, stabilité chimique et sur les propriétés hydrogéotechniqueinvestigations. Cet article présente l'effet de la teneur en boues sur la distribution granulométrique, la densité relative, la conductivité hydraulique, la compactibilité, et le comportement de retrait de mélanges sol-boue (MSB). s teneurs en eau initiales des boues et des sols est également étudié. Les résultats sont présentés et discutés MSB comme matériau de recouvrement.

Access this article:
Canadian Geotechnical Society members can access to this article, along with all other Canadian Geotechnical Conference proceedings, in the Member Area. Conference proceedings are also available in many libraries.

Cite this article:
Medard Bouda; Mamert Mbonimpa; Isabelle Demers; Mostafa Benzaazoua; Mario Gagnon (2012) Hydrogeotechnical characterization of AMD treatment sludge and sludge-based mixtures in GEO2012. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Paper152,author = Medard Bouda; Mamert Mbonimpa; Isabelle Demers; Mostafa Benzaazoua; Mario Gagnon,title = Hydrogeotechnical characterization of AMD treatment sludge and sludge-based mixtures,year = 2012}