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Water Pollution - PowerPoint PPT Presentation


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Water Pollution. Types and Sources of Water Pollution. #1 problem - Eroded soils. Organic wastes, disease-causing agents. Chemicals, nutrients. Radioactive stuff, heat. Point and Nonpoint Sources. NONPOINT SOURCES. Rural homes. Cropland. Urban streets. Animal feedlot. POINT SOURCES.

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Presentation Transcript
types and sources of water pollution
Types and Sources of Water Pollution
  • #1 problem - Eroded soils
  • Organic wastes, disease-causing agents
  • Chemicals, nutrients
  • Radioactive stuff, heat
point and nonpoint sources
Point and Nonpoint Sources

NONPOINT SOURCES

Rural homes

Cropland

Urban streets

Animal feedlot

POINT SOURCES

Suburban development

Factory

Wastewater treatment plant

major problem drinking water
Major Problem: Drinking Water
  • 1/2 of world’s people drink polluted water
  • Safe Drinking Water Act
  • EPA: Maximum contaminant levels (municipal, but not rural and private)
pollution of surface water streams
Pollution of Surface Water: Streams
  • D.O., B.O.D., fecal coliform bacteria count
pollution of surface water lakes
Pollution of Surface Water: Lakes
  • Cultural eutrophication
  • Slow turnover
  • Accumulation of nutrients, excessive plant growth, algae blooms
slide8

Mississippi

River Basin

Ohio

River

Missouri

River

Mississippi

River

LOUISIANA

Mississippi

River

Depleted

Oxygen

Dead Zone

Gulf of Mexico

slide9

Thermal Pollution

Suffocated

fish

Altered food web

Low

dissolved

oxygen

Decreased fish

population

groundwater pollution sources
Groundwater Pollution: Sources
  • Cold temperatures
  • Low flow rates
  • Few bacteria

Hazardous waste injection well

Pesticides

Coal strip mine runoff

De-icing road salt

Buried gasoline and solvent tank

Cesspool septic tank

Pumping well

Gasoline station

Waste lagoon

Water pumping well

Sewer

Landfill

Leakage from faulty casing

Accidental spills

Discharge

Unconfined freshwater aquifer

Confined aquifer

Confined freshwater aquifer

Groundwater flow

groundwater pollution prevention
Groundwater Pollution Prevention
  • Monitoring aquifers - expensive
  • Leak detection systems
  • Strictly regulating hazardous waste disposal
  • Protecting recharge areas

- aquifer classifications

oil spills
Oil Spills
  • Sources: offshore wells, tankers, pipelines and storage tanks
  • Effects: death of organisms, loss of animal insulation and buoyancy, smothering
  • Significant economic impacts
  • Short-term cleanup problems - beaches, wildlife
  • Long-term cleanup problem - persistence (decades)
case study chesapeake bay
Case Study: Chesapeake Bay
  • Largest US estuary
  • Relatively shallow
  • Slow “flushing” action to Atlantic
  • Major problems with dissolved O2
solutions preventing and reducing surface water pollution
Solutions: Preventing and Reducing Surface Water Pollution

Nonpoint Sources

Point Sources

  • Reduce runoff
  • Water Pollution

Control Act (1972)

  • Buffer zone vegetation
  • Clean Water Act

(1977)

- set effluent standards

- secondary treatment

  • Reduce soil

erosion

technological approach septic systems
Technological Approach: Septic Systems
  • Require suitable soils and maintenance
technological approach sewage treatment
Technological Approach: Sewage Treatment
  • Mechanical and biological treatment
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