Application of biotechnology for treatment of nitrogen compounds in gold mill effluents

This paper presents the results of a research study that is being conducted by the Mine Effluents Program, Mining and Mineral Science Laboratory (MMSL), Natural Resources Canada aimed at evaluating biotechnology processes for the treatment of nitrogen compounds such as thiocyanide (CNS) and ammonia (NH4-N) which are present in gold mill effluents. A sequencing batch reactor (SBR) technology, commonly used for the biological treatment of municipal and industrial effluents, was used in this study. In the SBR process, the micro-organisms were able to degrade CNS to NH4-N and NH4-N to nitrate (NO3-N) at operating conditions of two 12 h treatment cycles per day, with pH maintained in the 7.4 to 7.6 range, and at room temperature (approximately 21?C) and also at 12?C. The end products of CNS and NH4-N biological oxidation were NO3-N and sulphate (SO4) that are relatively non-toxic. Partial removal of NO3-N was achieved by biological denitrification reactions in the SBR process. The SBR process effluent was measured to be non-toxic to rainbow trout based on the 96 h acute toxicity test. The microbial consortium isolated from the SBR treating a simulated effluent was able to effectively oxidize CNS and NH4-N to NO3-N in water samples (under batch conditions) collected at three mine sites located in Quebec, the Northwest Territories, and Yukon.
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Publication: CIM Bulletin
Issue: 1081
Volume: 97
Year: 2004
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Summary: XPotential Products Inc. has developed technologies to convert auto shredder residues and other forms of plastic waste into useful products such as posts suitable for retaining walls and parking curbs. The technology is competitive provided low-cost plastic waste is available, and could have applications throughout the world. The paper describes the technology used and illustrates the various processing steps.
Publication: CIM Bulletin
Author(s): J. Lazareck
Issue: 1081
Volume: 97
Year: 2004
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Summary: The treatment of aqueous CuSO4-H2SO4-As-Sb solutions by electrodialysis in order to separate and concentrate species of interest has recently been studied. Results show that it is possible to separate copper from arsenic in electrodialysis cells. The separation of copper from antimony is also possible. Transport rate ranges that could be achieved, depending on experimental conditions, are 0.2 to 0.6 mol per hour per square metre of membrane for copper, 0.65 to 2.8 for sulphate, and 0.016 to...
Publication: CIM Bulletin
Author(s): L. Cifuentes, J.M. Casas
Issue: 1081
Volume: 97
Year: 2004
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Summary: Since its commercialization thirty years ago, the Recoflo® short bed ion exchange process has been extensively utilized for the recovery of a wide variety of acids and metal salts. In addition to a reduction in resin bed height from 200 cm to 300 cm to 15 cm to 60 cm, the process has a number of features such as utilization of fine mesh resins in a compressed bed which together make it ideal for a number of applications. The process has been extensively exploited, for example, in the metal...
Publication: CIM Bulletin
Author(s): C.J. Brown
Issue: 1081
Volume: 97
Year: 2004
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Summary: Gypsum scrap generated from wallboard manufacturing, construction and deconstruction activities in North America, Europe and Japan is a recognized environmental problem. Landfill disposal of this gypsum scrap is problematic, with deposits often creating hydrogen sulphide emissions and metallic sulphide groundwater leachates. Of these regions, Europe is the most advanced in dealing with the issue having enacted legislation, which will come into effect in July 2005 that will strongly encourage...
Publication: CIM Bulletin
Author(s): J.A. McCamley
Issue: 1081
Volume: 97
Year: 2004
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Summary: A method for determining the fineness of Au in electrum from the composition of fahlore coexisting with pyrite and chalcopyrite is presented. This method is based on previously published experimental brackets and activity-composition models for electrum and fahlore, and it is potentially useful for defining temperatures of hydrothermal mineralization and retrograde evolution of precious metals deposits. The authors demonstrate that it successfully predicts compositions of electrum reported...
Publication: CIM Bulletin
Author(s): R.O. Sack, F.W. Brackebusch
Issue: 1081
Volume: 97
Year: 2004
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Summary: An open pit a mine can be thought of as a business unit, with capital, operating and maintenance costs that exceed those of many large business enterprises. Truck-and-shovel operations have an inherent “looseness” to them, unlike manufacturing or processing operations where production components are tightly coupled (through conveyors, material flow in pipes, assembly lines, and so on). Effective monitoring and control of truck-and-shovel operations requires a combination of both information...
Publication: CIM Bulletin
Author(s): P.L. Richard
Issue: 1081
Volume: 97
Year: 2004
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