CEE 330 contaminant of the week summary

CEE 330 contaminant of the week summary - HUMAN SOURCES...

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HUMAN SOURCES: Some ozone is produced directly by industrial/commercial processes, and some chemical processes. Ozone, which is toxic at low concentrations, is used as a bleach, a deodorizing agent, and a sterilization agent for drinking water. Also it is largely used in the preparation of pharmaceuticals, synthetic lubricants and other commercially useful organic compounds. Certain electrical equipment generate significant levels of ozone. This is especially true of devices using high voltages, such as ionic air purifiers, laser printers, photocopiers, and tasers. Electric motors using brushes can generate ozone from repeated sparking inside the unit. Large motors that use brushes, such as those used by elevators or hydraulic pumps, will generate more ozone than smaller motors. NATURAL SOURCES: Some ozone is produced directly by lightning storms and waterfalls. Stratospheric ozone is naturally formed in chemical reactions involving ultraviolet sunlight and oxygen molecules, which make up 21% of the atmosphere. Near Earth’s surface, ozone is produced in chemical reactions involving naturally occurring gases and
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This note was uploaded on 10/07/2010 for the course CEE CEE 330 taught by Professor Jin during the Spring '10 term at University of Illinois, Urbana Champaign.

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CEE 330 contaminant of the week summary - HUMAN SOURCES...

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