Water Pollution
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Transcript of Water Pollution
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Water PollutionNitrogen and Phosphorus
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D24
• Explain how the accumulation of mercury, phosphates and nitrates affects the quality of water and the organisms that live in rivers, lakes and oceans.
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Learning Targets• I can explain the causes of nutrient
pollution.• I can explain the effects of nutrient
pollution.• I can identify ways to reduce
nutrient pollution.
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What is water pollution?
Water pollution is any contamination of water with chemicals or other foreign substances that are detrimental to human, plant, or animal health.
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What is an impaired water?
• Waters which are not suitable for their designated uses
• They can no longer be used for drinking, irrigation, industry, recreation or fishing
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Water Pollution
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What is nutrient pollution?
• An environmental problem caused by excess nitrogen and phosphorus in the air and water
What is the role of N and P in aquatic ecosystems?
• Supports the growth of algae and aquatic plants (this is normal)
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What happens when there is excess N & P in a body of water?• Eutrophication• Causes an algal bloom
www.nysun.com
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What happens as a lake starts to become eutrophic?
• Algae can overtake the body of water, turning it green
• Overgrowth of plants choke water movement
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What are the later stages of eutrophication?
• Plants and algae use up all of the resources and they die
• They use up the available oxygen as they decompose
• Water that is low in oxygen = hypoxia
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What happens if all of the dissolved oxygen is used up?
• Water becomes anoxic• Creates a dead zone
chemistry.about.com www.cosmosmagazine.com
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What are the 5 primary sources of nutrient pollution?
• Agriculture• Stormwater• Wastewater• Fossil fuels• Pollution from in and around the
house
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What are the effects of nutrient pollution?
• Environmental– Harmful algal blooms
(HAB)– Hypoxic areas– Dead zones– Acid rain
• Human– Blue baby syndrome– Illness from HAB
• Economic– Water treatment costs– Tourism losses– Commercial fishing and
shellfish losses– Real estate losses
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How can we prevent nutrient pollution?
• In our homes– Choose phosphate-free detergents,
soaps, and household cleaners– Use the appropriate amount of
detergent; more is not better– Always pick up after your pet– Proper septic system maintenance– Be energy efficient
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How can we prevent nutrient pollution?
• In our yards– Use fertilizer responsibly– Don't overwater gardens and yards– Landscape with native plants
• In the community– Get involved
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Learning Target Checkpoint
• What causes nutrient pollution?• What are the effects of nutrient
pollution?• How can you prevent nutrient
pollution?