Water Pollution
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Transcript of Water Pollution
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Water PollutionOceans, Rivers, Streams & Lakes
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Agriculture is the LEADING cause of water pollution!
Sources of agricultural pollution include:◦ Eroded sediment◦ Excess nitrogen and phosphorus from fertilizers◦ Pesticides◦ Animal waste◦ Salt from over-irrigated areas
Agriculture
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Industrial factories contribute to water pollution by emitting chemicals into the water
Mining creates erosion which releases sediment and toxic chemicals into the water
Industry and Mining
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Point Source: pollution is discharged from a specific location – drainpipe, ditch, sewer line, factories, oil tankers
Nonpoint Source: pollution is discharged from a broad area – runoff, parking lots, streets
Point vs. Nonpoint sources
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Message in The Waves – Great Pacific Garbage Patch
80% of marine pollution originates on land As more people live on the coast, this
number is expected to increase
Ocean Pollution
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Dumping of untreated waste – largely by developing countries◦ China’s coastline – large areas along the coastline
can no longer support marine ecosystems due to algal blooms
Cruiseliners Boats River Pollution
Causes of Ocean Pollution
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Aquatic zone with low dissolved oxygen◦ Few fish and bottom dwellers◦ Abundant decomposing bacteria◦ Caused by cultural eutrophication
◦ Cultural Eutrophication – human caused eutrophication (fertilizer runoff, waste from ranches, deposition of nitrogen compounds from the atmosphere)
Dead Zones
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Oil Spills◦ Exxon Valdez◦ Gulf Oil Spill
◦ Large oil spills get much publicity, but more oil is spilled into the ocean annually through land runoff from pipeline and refinery leaks than from most accidents
◦ Refined Oil is much harder to clean up than Crude Oil
Oil Pollution in the Ocean
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BP Gulf Oil Spill
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Crude Oil – marine life usually recovers in about 3 years◦ Clean-up usually recovers about 15% of spilled oil
Floating booms, skimmer boats, feathers & hair, bacteria
Refined Oil – marine life can take up to 10-20 years to recover
Oil Spill Clean-up
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Oxygen Sag Curve
Pollution in Streams and Lakes
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According to the WHO, Half of the world’s rivers are polluted!!
Most of these rivers run through developing countries
River Pollution
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◦Commercial and municipalities must file a permit before dumping waste into water
◦Establishes pollutant levels◦Provides funds to monitor and enforce
compliance◦Provides restoration and support of
aquatic life areas
Clean Water Act of 1972
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June 22, 1969 Sparks from a passing train ignited the river It was so full of oil and other pollutants that
the river caught fire Fires also occurred in 1868, 1883, 1887,
1912, 1922, 1936, 1941, 1948 and 1952
Cuyahoaga River - Ohio
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http://www.cleveland.com/science/index.ssf/2009/06/cuyahoga_river_fire_40_years_a.html
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Source: NOAA.gov
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China’s rivers
Figure 21-5
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Case Study: India’s Ganges River: Religion, Poverty, and Health
Religious beliefs, cultural traditions, poverty, and a large population interact to cause severe pollution of the Ganges River in India.◦ Very little of the sewage is treated.◦ Hindu believe in cremating the dead to free the soul
and throwing the ashes in the holy Ganges. Some are too poor to afford the wood to fully cremate. Decomposing bodies promote disease and depletes DO.
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Case Study: India’s 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.
Figure 21-6
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Common groundwater pollutants:◦ Fertilizers◦ Pesticides◦ Gasoline◦ Organic Solvents
Groundwater Pollution
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Aquifer Pollution animation
Obstacles to natural clean-up◦ Low DO levels = low number of decomposing
bacteria◦ Cold temperatures = slower chemical reactions
◦Result = may take thousands of years for groundwater to cleanse itself of the pollutants!
Aquifer pollutants
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Solutions◦ Pump the water to the surface, clean and return –
EXPENSIVE!◦ Inject microorganisms into aquifer◦ Nanoparticles of inorganic compounds pumped
into aquifers (still in development)
◦ A more feasible solution is to purify the drinking water rather than the aquifer itself
◦ Lifesaver Bottle◦ Lifestraw
Can we clean the aquifers?
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Infectious Disease can also be spread through the water.
Common infectious diseases:◦ Typhoid Fever◦ Cholera◦ Dysentery◦ Enteritis◦ Hepatitis B◦ Giardia
Infectious Disease
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Treatment of water before it is discharged into rivers or oceans
Not all water is treated before being released!
Water Sanitation
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Reducing Water Pollution through Sewage Treatment
• Septic tanks and various levels of sewage treatment can reduce point-source water pollution.
Figure 21-15
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Reducing Water Pollution through Sewage Treatment
Primary and Secondary sewage treatment.Figure 21-16