🗊Презентация WaterPollution

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Слайды и текст этой презентации

Слайд 1


Water Pollution
Описание слайда:
Water Pollution

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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?

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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

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Pollution in Streams
Описание слайда:
Pollution in Streams

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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

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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

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

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

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

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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

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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

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Oligotrophic and Eutrophic Lakes
Описание слайда:
Oligotrophic and Eutrophic Lakes

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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

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Groundwater Pollution
Описание слайда:
Groundwater Pollution

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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

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

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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

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Coastal Water Pollution
Описание слайда:
Coastal Water Pollution

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

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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

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

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

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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

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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

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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
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