Artificial circulation of a mine pit lake
作者： Roger Pieters , William Coedy , Ken I. Ashley , Gregory A. Lawrence
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摘要: We describe the artificial circulation (destratification) of a pit lake at Colomac mine site, 220 km north Yellowknife, NWT, Canada. The lake, with surface area 17 ha and depth 110 m, contained relatively saline water contaminated mining-related cyanide by-products, thiocyanate ammonia. As result snow ice melt, was intermittently meromictic cycling contaminants through oxygenated layer would have taken many years. To accelerate oxidation process, artificially circulated using two air diffusers 57 m. during open-water season, from 12 July 2006 for days, June 2007 89 days. After first h operation system, top 37 m mixed completely; after 34 h, to (57 m); approximately 6.5 bottom. Upon complete mixing, tempe...
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