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Solid waste


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Solid waste notes

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Solid waste

  1. 1. Solid WasteAny discarded material that isnot liquid or gas (junk mail,coffee grounds, junked cars,etc.)* about 6 pound/person /day
  2. 2. Where does our trash go?In 2007 almost 65% of thesolid wastes produced inU.S. went to 2,500 sanitarylandfills.
  3. 3. Sanitary Landfills– waste disposal facility where wastes are put in the ground and covered each day with a layer of soil.* Saferthan open dumps (habitat for obnoxious smell, flies & Rats).
  4. 4. • Leachate – liquids that drain fromlandfill. Contains dissolvedchemicals from decomposinggarbage.• leachate can get into ground water,making nearby wells unsafe.
  5. 5. .• Methane Gas is formed whenwastes decompose withoutoxygen.• can seep through ground andinto basements of nearbyhomes: one spark can blow up ahouse.
  6. 6.  “NIMBY” – not in my backyard attitude makes it difficult to find landfill sites. Finding acceptable locations – clay soils, stable bedrock, far from aquifer.
  7. 7. EPA Regulations for landfills –effective 1993•synthetic or clay liners• collecting and treating leachate• monitoring for escaping methanegas ( install vent pipes for escapinggas)•Monitor ground and surface water
  8. 8. Sanitary Landfill Design
  9. 9. •Incinerators – burn trash•17% of trash is burned inU.S.•Japan and Switzerland burnmore than 50% of their trash.
  10. 10. Advantages of Burning Trash•Reduces the volume of wasteby 90%• Provides energy – Waste toenergy plants – burn wastes toproduce steam for electricity.
  11. 11. Disadvantages of Burning Trash: Polluting gases ( carcinogens) Ash Disposal ( may contain heavy metals which are hazardous wastes, Ex. cadmium, mercury, lead)