Microsoft PowerPoint - Chapter 6 Lecture5

Microsoft PowerPoint - Chapter 6 Lecture5 - How does the...

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How does the sulfur get into the atmosphere? The burning of coal. Coal contains 1-3% sulfur and coal burning power plants usually burn about 1 million metric tons of coal a year! S( s ) + O 2 ( g ) SO 2 ( g ) 2 SO 2 ( g ) + O 2 ( g ) 2 SO 3 ( g ) Once in the air, the SO 2 can react with oxygen molecules to form sulfur trioxide, which acts in the formation of aerosols. Burning of sulfur with oxygen produces sulfur dioxide gas, which is poisonous. The Combustion of Coal • In a single power plant, 1million metric tons of coal are burned per year. • From this, we can calculate the amount of SO 2 released into our atmosphere • This amount is staggering! • 88 million pounds of SO 2 are released into the atmosphere every year – from a single plant! • Some plants that burn higher sulfur coal can produce even more than this! The Combustion of Coal The burning of coal by power plants produces the lion’s share of all sulfur dioxide in the atmosphere The Combustion of Coal • The world’s largest smelter is in Ontario, Canada • This plant produces nickel and copper ores of nickel and copper sulfides • The smelting process produces SO 2 from these ores • Even after intensive re-design, this plant and it’s neighboring smelters still produce over 200,000 metric tons of sulfur dioxide every year • Is this a bad thing? • Check it out… Fig. 6.15 Sudsbury, Ontario Canada – Smelting Plant Wanna live here? The Combustion of Coal • Vast quantities of sulfur dioxide released into the atmosphere by smelting and power plants are the primary contributors to acid rain from SO 2 emissions • But we noted earlier that SO
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Microsoft PowerPoint - Chapter 6 Lecture5 - How does the...

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