Report (English, PDF)

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Publisher-reported update

2026-08-26

In 2001, a project was initiated to stduy the behavior of treatment sludges in northern climatic conditions. For this study, leach columns were commissioned in the laboratory to evaluate metal mobility from treatment sludges. In addition, sludge densification by the freeze-thaw mechanism was studied. Sludge samples from effluent treatment operations at United Keno Hill (UKH) and Faro mine sites were used in this study. This project has been divided into two main tasks; a leaching study and a freeze-thaw study, but conducted in the laboratory and in the field. This final report presents the results of the sludge characterization, the freeze-thaw study and the leaching study. The composition of the acid mine drainage sludge produced at Faro and UKH mine sites were different as compared to typical lime treatment sludge. The metal composition of the mine water was very low, in particular for iron. While the pH of the wastewater was near neutral, the addition of lime was required mainly to precipitate zinc. The metal content of the sludge was low and the neutralization potential was very high which was in accordance with the high carbonate content measured in the sludge. The United…

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