Mine closure is often accompanied by discharge of environmentally hazardous, metal-laden water that must be treated before release into the environment. Passive biological treatment systems offer an effective, low cost treatment alternative particularly in remote mine sites, such as those in Yukon. These treatment systems rely in part on the action of naturally occurring soil microbes to facilitate sequestration of metals in these systems. These microbial communities, however, require sources of carbon to grow and perform metabolic functions.
Several research studies have demonstrated that additions of complex carbon substrates in the form of biomass materials such as sawdust, hay, and farm manure can help improve the efficiency and longevity of passive treatment systems. The goal of this research project is to investigate the possible use of locally available biomass materials such as spruce chips, moss, willow, and sedges as sources of complex carbon substrates for passive treatment systems in Yukon.
The first phase of the project has two objectives. First, we will use laboratory methods to analyze the composition of selected biomass. Secondly, we will use lab-scale bioreactors to monitor the microbial breakdown of biomass materials in simulated mine water at low temperatures that would be typically encountered in Yukon.
Later phases of the project will include more detailed analysis of how the complex carbon substrates are broken down and into what products, an understanding of the microbial community development, and the ability to reduce metals concentrations from mine water discharge.
Team:
Nina Piggott Yukon Research Centre, Yukon College Advisory committee
Amelie Janin Yukon Research Centre, Yukon College
Dr. Al Gibb School of Construction and Environment, BCIT
Lorne Sampson School of Construction and Environment, BCIT
Partners:
Yukon Mine Research Consortium:
Alexco Resource Corp.
Castone Mining Corp.
Casino Mining Corp.
Selwyn Chihong Ltd.
Victoria Gold Corp.
Funders:
Natural Sciences and Engineering Research Council of Canada
Yukon Mine Research Consortium:
Alexco Resource Corp.
Castone Mining Corp.
Casino Mining Corp.
Selwyn Chihong Ltd.
Victoria Gold Corp.