Water Pollution

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Water Pollution
Point Source vs. Nonpoint Source Pollution
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Water pollution

• Bacteria,Viruses,Protozoa, Parasitic worms
• Oxygen demanding substances
• Inorganic plant nutrients
• Organic chemicals
• Sediment or suspended matter
• Thermal pollution
• Genetic pollution

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How great is our water???
Dissolved Oxygen levels in water
Pg. 535
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Point Source Pollution

• comes from a specific source, like a pipe
• factories, industry, municipal treatment plants
• can be monitored and controlled by a permit system

Basically, a source you can directly point to!
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Nonpoint Source Pollution

• Nonpoint Source (NPS) Pollution is pollution
  associated with stormwater or runoff
• NPS pollution cannot be traced to a direct
  discharge point such as a wastewater treatment
  facility

When you cant pinpoint any one particular source.
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Examples of NPS

• oil grease from cars
• fertilizers
• animal waste
• grass clippings
• septic systems

• sewage cleaners from boats
• household cleaning products
• litter

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People Pollution
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Point and Nonpoint Sources
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Leaking tank
Aquifer
Bedrock
Water table
Groundwater flow
Free gasoline dissolves in groundwater (dissolved
phase)
Gasoline leakage plume (liquid phase)
Migrating vapor phase
Water well
Contaminant plume moves with the groundwater
Fig. 20-12
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Global Outlook Stream Pollution in Developing
Countries

• Water in many of central China's rivers are
  greenish black from uncontrolled pollution by
  thousands of factories.

Figure 20-7
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Case Study Indias Ganges River Religion,
Poverty, and Health

• Daily, more than 1 million Hindus in India bathe,
  drink from, or carry out religious ceremonies in
  the highly polluted Ganges River.

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Point Source or Nonpoint Source?
Point Source
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Point Source or Nonpoint Source?
Nonpoint Source
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Point Source or Nonpoint Source?

• A factory dumping extremely hot water into a
  river?

Point Source
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Point Source or Nonpoint Source?

• Oil dripping from cars on a road and flowing into
  the storm drain.

Nonpoint Source
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Roger Rosenblatt

• It is a hard truth to swallow, but nature does
  not care if we live or die. We cannot survive
  without the oceans, for example, but they can do
  just fine without us.