BIMM 120 Lecture15_ReadingGuide.051911

BIMM 120 Lecture15_ReadingGuide.051911 - Lecture 15...

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Lecture 15 – BIMM120.SP11 LECTURE 15 – May 19, 2011 Microbial Bioremediation (BLACK = this lecture / BLUE = different lecture / RED = not covered in lecture ) Chapter 24 – Nutrient Cycles, Bioremediation, and Symbioses (pp. 705-713) III. Microbial Bioremediation 24.6 Microbial Leaching of Ores Microbial Leaching o Sulfide forms water–insoluble minerals with many metals o If concentrations of metal in the ore are low, microbial leaching is practiced o Microbial leaching converts the metal sulfide to metal sulfate, which is water soluble The Leaching Process o In microbial leaching low-grade ore is dumped in a large pile and a dilute sulfuric acid solution is percolated down through the pile. The liquid emerging from the bottom of the pile is rich in dissolved metals and is transported to a precipitation plant where it is precipitated and purified Metal Recovery o The precipitation plant is where the Cu 2+ from the leaching solution is recovered o Shredded scrap iron, Fe 0 , is added to precipitation pond to recover copper from the leach liquid through a reaction that results in the formation of Fe
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BIMM 120 Lecture15_ReadingGuide.051911 - Lecture 15...

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