Week7Incineration - Incineration Images drawn from Basic Environmental Technology 5th edition J Nathanson Incineration One way to significantly

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1 Incineration Images drawn from Basic Environmental Technology 5 th edition J. Nathanson Incineration • One way to significantly reduce the volume and weight of MSW is to burn it in a properly designed incinerator • 70% or more (paper, plastic, food and yard waste, wood) is combustible • In US approximately 15% of MSW is incinerated, whereas in Japan this is 75% Other uses • Incinerators are also often used on a smaller scale to dispose of specific types of waste • Many types of medical waste are incinerated as this is the safest way to dispose of material that may be contaminated with pathogens.
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2 Chemistry • Burning is a chemical reaction where material is oxidized. • Oxygen from the air combines with the material to form various products • Basic reaction Organic material + Oxygen = water + carbon dioxide/carbon monoxide Combustion • Carbon dioxide is produced when there is complete combustions - this means there is sufficient oxygen • Carbon Monoxide forms when there is incomplete combustion … there isn’t sufficient oxygen present • Other products are also made depending on the nature of the materials combusted Combustion • For most efficient combustion to occur temperatures in the incinerator must reach 800C to as high as 1400 C • Combustion does not completely remove waste, but the amount of refuse is reduced to about 90% of the original volume and 75% of the original weight. • The lost weight is emitted either as water vapour, carbon dioxide, or other gases
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3 Solid Residue • An incinerator will produce two types of solid waste – Bottom ash
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This note was uploaded on 10/20/2010 for the course NATS Nats1840(A taught by Professor M.h.armour during the Fall '10 term at York University.

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Week7Incineration - Incineration Images drawn from Basic Environmental Technology 5th edition J Nathanson Incineration One way to significantly

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