Opportunities for using pulp mill residues in mine remediation Satyro, Suellen; Gasparini, Carolina; Baldwin, Susan A.
The pulp and paper industry produces organic wastes such as primary and secondary biosolids from water treatment, as well as bottom and fly ashes from energy production through combustion of biomass. We are investigating these residues for reuse in mine remediation; such as to support sulphate reducing bacteria and remove zinc and cadmium with secondary biosolids as the carbon and nutrient source, and treatment of acid mine drainage using green liquor and fly ash. Use of these residues is limited by transportation costs depending on the proximity of pulp mills and mine sites to each other. To expand the reuse of pulp mill residues, there is the opportunity to increase their value through fairly straight forward thermal, physical and or chemical transformations that functionalize them in order to sequester and recover specific values. In this paper, we provide the example where we recovered selenium for potential recycling from simulated mine impacted water using functionalized residues. Areas where this can be applied include the Elk Valley, East Kootenays, and the Cariboo region of British Columbia.
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