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Unformatted text preview: http://www.denali.gov/content/challenges/solid.htm 87 88 Dumps are pretty much
self-explanatory – solid
waste (trash) is just
In most of the United
States, dumps are now
obsolete and illegal.
In LDCs dumps are still
Dumps are notorious
for their stench,
disease, and for
attracting vermin. Sanitary Landfill Problems with Sanitary Landfills
Leachate — liquid (from rain or
other sources) reacts with solid
waste to produce a toxic brew that
can easily contaminate
Capacity — since the 1970s the
number of landfills in the US has
declined by 80%.
NIMBY — “not-in-my-back-yard” The most common way to dispose of solid waste in
the developed world today is in a sanitary landfill.
Although a definite improvement on the old-fashioned
dump, landfills have some serious problems.
http://school.discovery.com/homeworkhelp/worldbook/atozpictures/lr000599.html 89 Sanitary Landfills: Declining Capacity 90 Incineration
Incinerators can be designed to burn
In theory this turns a problem into an
– Waste can be burned to generate
– The volume of waste can be reduced
drastically (by up to 96%).
– There were 86 waste-to-energy facilities in
the US as of 2010, generating nearly 3,000
megawatt hours of electricity (about 1.5
times the amount produced by the San
Onofre Nuclear Generating Station). http://www.epa.gov/epawaste/nonhaz/municipal/pubs/msw07-fs.pdf http://sofia.usgs.gov/publications/posters/merc_program/;
http://www.wte.org; http://www.sce.com/PowerandEnvironment/PowerGeneration/ 15 91 Problems With Incineration 92 Products can be “recycled” in two ways: Air Pollution — the fumes produced
by burning solid waste are highly
Ash — although the volume of trash
is reduced by up to 96%, the
remaining ash is extremely toxic and
highly concentrated, and must be
disposed of — probably in a toxic
waste landfill. 93 Recycling: Pic...
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- Fall '10