Water Pollution. Types of Water Pollution Effect of sewage on dissolved oxygen and biological oxygen demand.

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Presentation transcript:

Water Pollution

Types of Water Pollution Effect of sewage on dissolved oxygen and biological oxygen demand

Types of Water Pollution Eutrophication: An Enrichment Problem Oligotrophic lake

Types of Water Pollution Eutrophication: An Enrichment Problem Eutrophic lake

Types of Water Pollution Sediment Pollution Low sediment load

Types of Water Pollution Sediment Pollution High sediment load

Types of Water Pollution Inorganic Plant and Algal Nutrients The Dead Zone in the Gulf of Mexico

Water Quality Today Municipal Water Pollution

Water Quality Today Groundwater Pollution

Improving Water Quality Purification of Drinking Water General process: Collected from reservoir or ground water.

Improving Water Quality Purification of Drinking Water General process: Water treated

Improving Water Quality Purification of Drinking Water General process: Distributed to customers Wastewater collected as sewage

Improving Water Quality Purification of Drinking Water General process: Sewage treated

Improving Water Quality Municipal Sewage Treatment Primary and Secondary Sewage Treatment

Improving Water Quality Individual Septic Systems Septic tank

Improving Water Quality Individual Septic Systems Drain field/Leach Fields

Laws Controlling Water Pollution Case-in-Point: Water Pollution in the Great Lakes

What is a Pesticide? First-Generation Pesticides Inorganic compounds (e.g., lead, mercury) Botanicals (e.g., nicotine, pyrethrin)

Benefits and Problems with Pesticides Benefit: Disease Control Location of malaria

Benefits and Problems with Pesticides Problem: Evolution of Genetic Resistance # of species exhibiting genetic resistance to pesticides

Benefits and Problems with Pesticides Problem: Evolution of Genetic Resistance Creates a pesticide treadmill Pesticide application Kills most pests Resistant survive Numbers increase New population genetically resistant EVEN MORE INCREASE

Benefits and Problems with Pesticides Problem: Imbalances in the Ecosystem Creation of New Pests

Benefits and Problems with Pesticides Problem: Persistence, Bioaccumulation, and Biological Magnification Biomagnification of DDT

Benefits and Problems with Pesticides Problem: Mobility in the Environment

Risks of Pesticides to Human Health Short-term Effects of Pesticides Handling of food with pesticide residue

Alternatives to Pesticides Integrated Pest Management

Alternatives to Pesticides Integrated Pest Management Rice Production in Indonesia IPM introduced

World Food Problems Common diseases due to malnourishment: Kwashiorkor kwa·shi·or·kor (kwä'shē-ôr'kôr') Severe protein malnutrition, especially in children after weaning, marked by lethargy, growth retardation, anemia, edema, potbelly, skin depigmentation, and hair loss or change in hair color.

Common diseases due to malnourishment: Ma·ras·mus (mə- răz'məs) A progressive wasting of the body, occurring chiefly in young children and associated with insufficient intake or malabsorption of food.

World Food Problems Maintaining Grain Stockpiles World grain carryover stocks U.N. estimates that carryover stocks should not fall below 70 days.

The Principal Types of Agriculture Industrialized agriculture

Challenges of Producing More Crops and Livestock Increasing Crop Yields US wheat yields

Challenges of Producing More Crops and Livestock Genetic Engineering

Solutions to Agricultural Problems Sustainable Agriculture

Fisheries of the World Overharvesting is the most serious problem

Hazardous and Solid Waste Types of Solid Waste

Solid Waste Disposal of Solid Waste- Too many landfills!

Sanitary Landfills

Solid Waste The Special Problem of Tires Made from materials that cannot be recycled Can be incinerated

Solid Waste Disposal of Solid Wastes Incineration CO 2 emissions per kwatt-hour of electricity production

Solid Waste Mass burn incinerator

Waste Prevention Recycling, Composting, Reusing Solid waste produced by average family of four in one year in US

Waste Prevention Integrated Waste Management

Hazardous Waste Case-in-Point: Hanford Nuclear Reservation Drums of low-level nuclear waste

Hazardous Waste Hazardous waste landfill