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Title:

Wastewater Treatment

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Technological Approach: Septic Systems. Mostly rural and some suburban homes ... Typical Septic Tank System. Technological Approach: Sewage Treatment ... – PowerPoint PPT presentation

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Title: Wastewater Treatment


1
Wastewater Treatment
2
Protecting Coastal Waters from Pollution
Fig. 14-36, p. 337
3
Point Source Pollution
  • Most cities in developing countries discharge
    80-90 of sewage directly into aquatic
    ecosystems
  • Clean Water Act 1977 and Water Quality Act 1987
    U.S. laws that set standards for key water
    pollutants. Requires polluters to get permits
  • In 2000, 45 of US lakes, 39 streams and 51 of
    estuaries were too polluted for swimming.

4
Solutions Preventing and Reducing Surface Water
Pollution
Nonpoint Sources
Point Sources
  • Reduce runoff
  • Clean Water Act
  • Buffer zone vegetation
  • Water Quality Act
  • Discharge trading?
  • Reduce soil erosion

5
Should the Clean Water Act be Strengthened?
  • Yes environmentalists- more , monitoring
  • No farmers, libertarians, developers-
    compensation for losses from wetland protection
  • State and local regulators want more discretion

6
Technological Approach Septic Systems
  • 25 of all homes in US on septic tanks
  • Mostly rural and some suburban homes
  • Require suitable soils and maintenance

7
Typical Septic Tank System
Fig. 14-37, p. 339
8
Technological Approach Sewage Treatment
  • Primary and secondary treatment

Fig. 14-38, p. 340
9
Improving Sewage Treatment
  • Systems that exclude hazardous wastes
  • Non-hazardous substitutes
  • Collection of household hazardous wastes
  • Composting toilet systems
  • Wastewater gardens
  • Treatment with wetlands
  • 34 East Coast cities - primary treat. only
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