Abstract
Economical remediation of acid rock drainage (ARD) at secluded high-altitude western ore mines is difficult given the current treatment technology. Several passive-engineered systems that are based on wetland technology were tested in the laboratory with three western ore mine ARDs (Co, Cu and Fe mines) and with a copper leachate effluent. These systems used well-weathered lodgepole pine sawdust as the sole carbon source and mud from a pond at one of the mine sites as the source of sulfate-reducing bacteria (SRB). Simple one-pass flow-through systems removed 44% to 99% of the various heavy metals from the Co and Cu mine ARDs and increased the pHfrom 3 to 7 after 28 days of SRB acclimation with a five-day residence time. Carbohydrate utilization rates were generally low, except for one 437-day run, which consumed 25%, 30% and 21% of the cellulose, hemicellulose and lignin, respectively. Initial pH, amounts of toxic heavy metals and the degree of pre de gradation of the sawdust were found to significantly affect both remediation potential and acclimation time. Engineered SRB systems, alone or in combination with other passive technologies, offer promise for the economical remediation of western US ore mine ARDs.
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Nonmeeting paper number 99–313. Oiscussion of this peer-reviewed and approved paper is invited and must be submitted to SME prior to Nov. 30, 2000.
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Thompson, D.N., Sayer, R.L. & Noah, K.S. Sawdust-supported passive bioremediation of western United States acid rock drainage in engineered wetland systems. Mining, Metallurgy & Exploration 17, 96–104 (2000). https://doi.org/10.1007/BF03402835
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DOI: https://doi.org/10.1007/BF03402835