Download 11.3 Notes - Cobb Learning

Water Pollution
Water Pollution
 “introduction of chemical, physical,
biological agents into water that
degrade the water quality and adversely
affect the organisms that depend on
the water.”
Two types of Water Pollution
Point Source
“pollution discharged
from a single source.”
Non-Point Source
“pollution that comes
from many different
sources and is often
difficult to identify”
Point Source Pollution
Look at Table 3 on page 304
What are 3 sources of POINT SOURCE
POLLUTION?
- often traced to ONE source
- Enforcing clean up can still be
difficult!
Non-Point Source Pollution
Runoff can carry pollutants into a stream
Look at Table 4 on page 305
List several sources of Non-Point Source pollution
- Extremely difficult to regulate and control.
- 96% of water pollution comes from non-point
source pollution
Principal Water Pollutants
Look at Table 5 on page 306
Pathogens
Organic matter
Organic Chemicals
Inorganic Chemicals
Heavy Metals
Physical Agents
Waste Water
 “Water that contains waste from homes or industry”
 Treated so it can be released to a river or lake
 Sewage sludge: solid material that remains after
treatment. Considered Hazardous Waste. Often
incinerated and ash is buried.
 New uses: Fertilizer?
bricks for buildings?
Steps:
1. Filtration - wastewater
2. First Settling Tank – smaller particles sink to the
bottom called Sewage Sludge.
3. Aeration Tank – mixed with oxygen and bacteria.
Bacteria will use oxygen to feed on wastes.
4. Second Settling Tank – bacteria grown in aeration
tanks removed (as sludge)
5. Chlorination –chlorine added to disinfect water
before its released to lakes, rivers, oceans, etc.
Waste Water Video
http://video.search.yahoo.com/video/play;_ylt=A2KLqIKBHD
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Gdwb3MDMw-?p=wastewater+treatment&vid=00011763641&l=2%3A27&turl=
http%3A%2F%2Fd2.yimg.com%2Fsr%2Fvideo%2Fthm300x300%2F23ea4170afa03ffb3bf2c650cb2e979d&rurl=http%3
A%2F%2Fwww.dailymotion.com%2Fswf%2Fvideo%2Fx8f1he
&tit=Steps+in+the+treatment+of+wastewater&c=2&sigr=11b9
8ka6f&sigt=114ecghoe&plr=5&hid=x8f1he&mid=c4f18c59dc161
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Artificial Eutrophiciation
Dead zones
Thermal Pollution
 Due to increase in
temperature of the water
 Can occur when power plants
and other industries use
water in cooling systems and
then discharge the warm
water into a lake or river.
 As temperature of water
increase, dissolved oxygen
decreases. This creates
suffocation of fish.
 This oxygen deprived river
will flow into over larger
bodies of water which will
change entire ecosystems.
Groundwater Pollution
 Usually from percolated
polluted surface water
 Sources:
pesticides, herbicides,
chemical fertilizers, and
petroleum
 Major Source: is
millions of
underground storage
tanks that may be
leaking.
Cleaning up Groundwater Pollution
 GW is one of the most
challenging problems
 If cleaned, it would still
remain polluted for
generations
 If aquifers get polluted,
an attempt to clean them
is hard since pollution
clings to rock and sand
– which will continue to
pollute clean water.
Now complete the ws
Ocean Pollution
 Ships can legally dump
wastewater and garbage
overboard in some parts
of the ocean.
 85% of ocean pollutants
contain oil, toxic waste,
medical waste – which
comes from on land.
 Affects sensitive coastal
ecosystems the most
Great Garbage Patch
Oil Spills
 Accidental Oil Spills 5%
 Most oil comes from
cities/towns – 200-300
millions galls of oil from
nonpoint sources
Water Systems and Ecosystems
 Some ecosystems limit
the amount of fish that
people can eat
Cleaning up Water Pollution
Clean Water Act 1972
To “restore and maintain the chemical, physical, and
biological integrity of the nation’s waters.”