Chapter Fifteen

Chapter Fifteen - Environmental Concerns: Wastes and...

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Environmental Concerns: Wastes and Pollution Chapter 15
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Introduction Environment: external conditions, circumstances, and influences surrounding and affecting the growth and development of an organism or a community of organisms Ecology: study of how living things interact with Biosphere: zone of the earth where life is found
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Natural Environmental Hazards Natural hazards: an event of nature that increases the probability of disease, injury, or death of humans; e.g., tsunamis, floods, tornadoes, hurricanes Results of natural hazards: contaminated In addition, humans can alter, pollute, & destroy their environment & thus impact health
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unwanted by-products of human activities; e.g., wastewater, garbage, trash, radioactive wastes Factors contributing to environmental hazards Urbanization Industrialization Human population growth Production & use of disposable products & containers
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Disposal of wastes often pollutes natural resources– Solid wastes Sources: agriculture (51%), mining (38%), industry (8%), municipalities–municipal solid Each person produces an average of 4.5 pounds of MSW/day Getting rid of it; will it decompose
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© Elmhurst College, Elmhurst, IL Contribution of Various Waste Sources Generated in the U.S
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Types and Percentages of Solid Wastes Generated in the U.S © U.S Environmental Protection Agency
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Waste Increase © U.S Environmental Protection Agency
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Solid waste management Collection: 80% of waste management money spent on this Source reduction: limit creation Recycling: collecting (curbside & drop-off), sorting, & processing; composting; in 2003, U.S. recycled 31% of MSW; goal is 38% by 2010
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Recycling Rates of Selected Materials © U.S Environmental Protection Agency
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Solid waste management (continued) Disposal Sanitary landfills: waste disposal sites on land suited for it– waste spread in layers, compacted, & covered; primary means of disposal; RCRA (Rick- Rah) of 1976 eliminated dumps; leachates a concern Combustion (incineration): Second major method of disposal (15%); reduces weight by 75% & volume by 90%; energy recovery plants
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Chapter Fifteen - Environmental Concerns: Wastes and...

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