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- W77477567 abstract "Various treatments have been proposed to attenuate and eventually inhibit the generation of acid mine drainage (AMD) or acid-rock drainage (ARD). Previous work performed by Boojum Research Ltd. indicated that the addition of a mining waste product from the TexasGulf (North Carolina) phosphate mine showed some promising results when pyritic waste rocks from a northern Quebec Cu /Zn mine were mixed with NPR during an outdoor weathering experiment that lasted 989 days. Scanning electron microscopy (SEM) observations of the waste rock surfaces submitted to NPR addition in the weathering experiment indicated the presence of both iron and phosphorus in bacterial biofilms, whereas rock surfaces in the control experiments (i.e, without NPR) showed microbial corrosion. In order to revive the biofilms on the rock surfaces, samples from the weathering experiments with NPR were submerged in a growth medium adjusted to pH 7.2 for 7 days (which was similar to the pH measured in the effluents from the drum experiment). ESEM (Environmental Scanning Electron Microscopy) observations revealed microbial colonization and fine grain precipitation on the microbial cells present in the biofilms. To further assess the interactions between NPR, bacteria and the waste rocks, fresh cut surfaces of waste rocks were mixed with NPR and acidophilic bacteria at pH 2.2. NPR addition first neutralized the acidity of the growth medium by supplying soluble phosphate and carbonate and prevented the development of corrosion pits on the fresh rock surfaces. The reactivity of the waste rock surfaces appears to depend on the microbial activity at the surface, i.e., whether bacteria produced a biofilm or not. It is also clear that the presence of NPR favored the development of biofilms. Additional" @default.
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- W77477567 date "2003-01-01" @default.
- W77477567 modified "2023-09-25" @default.
- W77477567 title "Microbial Effects of Natural Phosphate Rock(NPR) Addition to Mining Wastes" @default.
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- W77477567 doi "https://doi.org/10.21000/jasmr03011294" @default.
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