🗊Презентация WaterPollution

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Слайды и текст этой презентации


Слайд 1





Water Pollution
Описание слайда:
Water Pollution

Слайд 2





Water Pollution: Types, Effects, and Sources
What is water pollution?
Major types of pollutants, sources and effects
Point and nonpoint sources
Is the water safe to drink?
Описание слайда:
Water Pollution: Types, Effects, and Sources What is water pollution? Major types of pollutants, sources and effects Point and nonpoint sources Is the water safe to drink?

Слайд 3





Major Categories of Water Pollutants
Infectious Agents
Bacteria, Viruses, Protozoa, Parasitic Worms
Source: Human and animal waste
Oxygen-Demanding Waste
Organic debris & waste + aerobic bacteria
Source: Sewage, feedlots, paper-mills, food processing
Inorganic Chemicals
Acids, Metals, Salts
Sources: Surface runoff, Industrial effluent, household cleansers
Radioactive Materials
Iodine, radon, uranium, cesium, thorium
Source: Coal & Nuclear Power plants, mining, weapons production, natural
Описание слайда:
Major Categories of Water Pollutants Infectious Agents Bacteria, Viruses, Protozoa, Parasitic Worms Source: Human and animal waste Oxygen-Demanding Waste Organic debris & waste + aerobic bacteria Source: Sewage, feedlots, paper-mills, food processing Inorganic Chemicals Acids, Metals, Salts Sources: Surface runoff, Industrial effluent, household cleansers Radioactive Materials Iodine, radon, uranium, cesium, thorium Source: Coal & Nuclear Power plants, mining, weapons production, natural

Слайд 4





Pollution in Streams
Описание слайда:
Pollution in Streams

Слайд 5





Benefits of Floodplains
Highly productive wetlands
Provide natural flood and erosion control
Maintain high water quality
Recharge groundwater
Fertile soils
Nearby rivers for use and recreation
Flatlands for urbanization and farming
Описание слайда:
Benefits of Floodplains Highly productive wetlands Provide natural flood and erosion control Maintain high water quality Recharge groundwater Fertile soils Nearby rivers for use and recreation Flatlands for urbanization and farming

Слайд 6





Dangers of Floodplains and Floods
Deadly and destructive
Human activities worsen floods
Failing dams and water diversion
Bangladesh
Описание слайда:
Dangers of Floodplains and Floods Deadly and destructive Human activities worsen floods Failing dams and water diversion Bangladesh

Слайд 7





Before and During a Flood in St. Louis, Missouri
Описание слайда:
Before and During a Flood in St. Louis, Missouri

Слайд 8





Flooding After Deforestation of a Hillside
Описание слайда:
Flooding After Deforestation of a Hillside

Слайд 9





Flooding After Deforestation of a Hillside
Описание слайда:
Flooding After Deforestation of a Hillside

Слайд 10





Reducing Flood Risks
Channelization
Levees (floodwalls)
Dams
Protect and restore wetlands
Identify and manage flood-prone areas
Precautionary approach
Описание слайда:
Reducing Flood Risks Channelization Levees (floodwalls) Dams Protect and restore wetlands Identify and manage flood-prone areas Precautionary approach

Слайд 11





Lake Pollution
Dilution less effective than with streams
Stratification in lakes and relatively little flow hinder rapid dilution of pollutants
Lakes more vulnerable to pollutants than streams
How pollutants enter lakes
Eutrophication: causes and effects
Oligotrophic and eutrophic lakes
Cultural eutrophication
Preventing or removing eutrophication
Описание слайда:
Lake Pollution Dilution less effective than with streams Stratification in lakes and relatively little flow hinder rapid dilution of pollutants Lakes more vulnerable to pollutants than streams How pollutants enter lakes Eutrophication: causes and effects Oligotrophic and eutrophic lakes Cultural eutrophication Preventing or removing eutrophication

Слайд 12





Oligotrophic and Eutrophic Lakes
Описание слайда:
Oligotrophic and Eutrophic Lakes

Слайд 13





Groundwater Pollution: Causes and Persistence
Sources of groundwater pollution
Slow flowing: slow dilution and dispersion
Consequences of lower dissolved oxygen
Fewer bacteria to decompose wastes
Cooler temperatures: slow down chemical reactions
“Degradable” and nondegradable wastes in groundwater
Описание слайда:
Groundwater Pollution: Causes and Persistence Sources of groundwater pollution Slow flowing: slow dilution and dispersion Consequences of lower dissolved oxygen Fewer bacteria to decompose wastes Cooler temperatures: slow down chemical reactions “Degradable” and nondegradable wastes in groundwater

Слайд 14





Groundwater Pollution
Описание слайда:
Groundwater Pollution

Слайд 15





Extent of Groundwater Pollution
Not much is known about groundwater pollution
Organic contaminants, including fuel leaks
Arsenic
Protecting groundwater: Prevention is best
Описание слайда:
Extent of Groundwater Pollution Not much is known about groundwater pollution Organic contaminants, including fuel leaks Arsenic Protecting groundwater: Prevention is best

Слайд 16





Preventing and Cleaning Up Pollution in Groundwater
Описание слайда:
Preventing and Cleaning Up Pollution in Groundwater

Слайд 17





Ocean Pollution
How much pollution can oceans tolerate?
Some pollutants degrade and dilute in oceans
Ocean dumping controversies
Описание слайда:
Ocean Pollution How much pollution can oceans tolerate? Some pollutants degrade and dilute in oceans Ocean dumping controversies

Слайд 18





Coastal Water Pollution
Описание слайда:
Coastal Water Pollution

Слайд 19





Oxygen-depleted Water in the Gulf of Mexico
Описание слайда:
Oxygen-depleted Water in the Gulf of Mexico

Слайд 20





Chesapeake Bay
Largest US estuary
Pollution “sink”
Oxygen depletion
Chesapeake Bay Program
Описание слайда:
Chesapeake Bay Largest US estuary Pollution “sink” Oxygen depletion Chesapeake Bay Program

Слайд 21





Effects of Oil on Ocean Life
Описание слайда:
Effects of Oil on Ocean Life

Слайд 22





Preventing and Cleaning Up Pollution in Coastal Waters
Описание слайда:
Preventing and Cleaning Up Pollution in Coastal Waters

Слайд 23





Preventing Nonpoint Source Pollution
Mostly agricultural wastes
Use vegetation to reduce soil erosion
Reduce fertilizer use
Use plant buffer zones around fields
Integrated pest management: Only use pesticides when necessary
Use plant buffers around animal feedlots
Keep feedlots away from slopes, surface water and flood zones
Описание слайда:
Preventing Nonpoint Source Pollution Mostly agricultural wastes Use vegetation to reduce soil erosion Reduce fertilizer use Use plant buffer zones around fields Integrated pest management: Only use pesticides when necessary Use plant buffers around animal feedlots Keep feedlots away from slopes, surface water and flood zones

Слайд 24





Laws for Reducing Point Source Pollution
Clean Water Act
Water Quality Act
Описание слайда:
Laws for Reducing Point Source Pollution Clean Water Act Water Quality Act

Слайд 25





Sewage Treatment Systems
Sewage treatment in rural and suburban areas
Septic tanks
Primary (physical) sewage treatment
Secondary (biological) sewage treatment
Urban sewage treatment (Clean Water Act)
Sewage treatment facilities in many cities fail to meet federal standards
Bleaching and disinfection
Disinfectants: chlorine, ozone, and ultraviolet radiation
Описание слайда:
Sewage Treatment Systems Sewage treatment in rural and suburban areas Septic tanks Primary (physical) sewage treatment Secondary (biological) sewage treatment Urban sewage treatment (Clean Water Act) Sewage treatment facilities in many cities fail to meet federal standards Bleaching and disinfection Disinfectants: chlorine, ozone, and ultraviolet radiation

Слайд 26





Typical Septic Tank System
Описание слайда:
Typical Septic Tank System

Слайд 27





Primary and Secondary Sewage Treatment
Описание слайда:
Primary and Secondary Sewage Treatment

Слайд 28





Improving Sewage Treatment
Systems that exclude hazardous wastes
Non-hazardous substitutes
Composting toilet systems
Working with nature to treat sewage
Using wetlands to treat sewage
Описание слайда:
Improving Sewage Treatment Systems that exclude hazardous wastes Non-hazardous substitutes Composting toilet systems Working with nature to treat sewage Using wetlands to treat sewage

Слайд 29





Ecological Wastewater Treatment
Описание слайда:
Ecological Wastewater Treatment

Слайд 30





Should the Clean Water Act be Strengthened?
Описание слайда:
Should the Clean Water Act be Strengthened?

Слайд 31





Drinking Water Quality
Purification of urban drinking water
Purification of drinking water in developing countries
Bottled water
Описание слайда:
Drinking Water Quality Purification of urban drinking water Purification of drinking water in developing countries Bottled water

Слайд 32


WaterPollution , слайд №32
Описание слайда:



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