🗊Презентация Water Pollution

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Слайды и текст этой презентации

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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
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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
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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
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Before and During a Flood in St. Louis, Missouri

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Flooding After Deforestation of a Hillside
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Flooding After Deforestation of a Hillside

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Flooding After Deforestation of a Hillside
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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
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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
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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
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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
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Coastal Water Pollution

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Oxygen-depleted Water in the Gulf of Mexico
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Oxygen-depleted Water in the Gulf of Mexico

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

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Effects of Oil on Ocean Life
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Effects of Oil on Ocean Life

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Preventing and Cleaning Up Pollution in Coastal Waters
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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

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Laws for Reducing Point Source Pollution Clean Water Act Water Quality Act
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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

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Typical Septic Tank System
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Typical Septic Tank System

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Primary and Secondary Sewage Treatment
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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
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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

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Ecological Wastewater Treatment
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Ecological Wastewater Treatment

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Should the Clean Water Act be Strengthened?
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Should the Clean Water Act be Strengthened?

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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

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Water Pollution , слайд №32
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