Transcript solid_waste_power_point

Landfills
• In landfills they compact the waste so it can fit in
a smaller space.
• Bacteria helps break down the waste.
• Landfills take up a lot of room.
• When rain water falls on the waste it absorbs
chemicals. These chemicals mix with the water
and form a polluted liquid called leachate. This
mixture can pollute streams or lakes.
Incineration
Advantages of incinerating wastes are:
-it makes the waste 90% smaller
-it produces its own energy
Disadvantages of incinerating wastes are:
-it cost too much money for a city to get
-even the best incinerators produce some
pollution
Recycling
-Recycling is the process of reclaiming raw materials
and reusing them.
-When a material is biodegradable it means that the
material can be broken down by bacteria or other
decomposers
(ex. Newspaper, some soap)
Recycling Metal
• Aluminum can be reused over and over and
never lose its volume or strength.
• Recycling metal can help conserve our
resources and cause less pollution then
making it from scratch.
Recycling Glass
• Recycling glass costs less money than
making new glass.
• Glass can be recycled many times. And it
doesn’t cause much pollution.
Recycling Paper
• When you recycle paper every time it gets a
little rougher, weaker, and darker.
• Paper products are made from pulp.
• Pulp is a dry fibrous material prepared by
chemically or mechanically separating
fibers from wood or fiber crops.
Recycling Plastic
• Resins are solid materials that are formed
from when oil is refined to make gasoline or
other materials.
• Resins can be heated and stretched into
plastic products.