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KINES126.1
Monday, April 19, 1999
Announcements:
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Exam #2 is Friday April 23 at 10:10 am in 119
Osmond Building.
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Please bring a #2 pencil and spread out when you
arrive.
Lecture Notes:
ENVIRONMENTAL HEALTH
Composition of Trash
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38% of all trash: paper
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18% of all trash: yard trimmings
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The rest: plastic, metal, glass, food waste
What did we used to do with trash?
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Middle ages: "toss it into the gutter"
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1700s: "take it out to the country"
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1800s: "take it to the dump"
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1950s: "bury it in a landfill"
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1970s: "burn it in an incinerator"
What can you recycle?
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metal
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glass
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plastics
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paper
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cardboard
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yard/kitchen waste
Landfills
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Two types of landfills:
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Sanitary landfills are disposal sites for
non hazardous solid wastes spread in layers, compacted to the smallest
practical volume, and covered by material applied at the end of each operating
day.
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Secure Chemical landfills are disposal sites
for hazardous wastes, selected and designed to minimize the chance
of release of hazardous substances into the environment.
How long will trash be around?
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cigarette butts: 1-5 years
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aluminum cans and tabs: 500 years
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glass bottles: 1000 years
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plastic bags: 10-20 years
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plastic coated paper: 5 years
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plastic film containers: 20-30 years
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nylon fabric: 30-40 years
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leather: up to 50 years
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wool socks: 1-5 years
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orange and banana peels: up to 2 years
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tin cans: 50 years
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plastic six pack holders: 100 years
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plastic bottles and styrofoam: indefinitely
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