Govet Essay

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6/26/2012 Water Pollution • Any physical or chemical change in water that adversely affects the health of humans and other organisms. Water Pollution Chapter 21 • Sewage – wastewater from drains or sewers. Water Pollution Pollutant -- Any biological, physical or chemical substance in which identifiable excess causes: • Degradation of intended use • Departure from norm • Impacts on public health • Ecological impacts Results from: Types of Water Pollutants Pathogens  Disease Organic Wastes  reduced DO Nutrients  Eutrophication Sediments from Erosion  Increase turbidity Inorganics  ??? Organic Toxins  ??? Thermal  thermal stratification & turn-over & decreased DO  Radioactive  mutation, death….  Non-consumptive use:  Consumptive use:  Natural Sources use & return (most human uses)        used & evaporated (irrigation) Biochemical Oxygen Demand • The amount of oxygen microorganisms need to decompose biological wastes into carbon dioxide, water and minerals. Artificial (Cultural) EutrophicationHuman induced eutrophication • Lake has clear water and supports aquatic life. • Unenriched. • Lake that has had added enrichment by inorganic plant and algal nutrient. Oligotrophic Lake Eutrophic Lake 1 6/26/2012 Disease Causing Agents • Infectious organisms that cause disease • Come from the wastes of infected individuals. • Diseases are rare in highly developed countries, but a major cause of death in lesser developed countries. • Municipal waste water contains: – Bacteria and Viruses • Typhoid, cholera, dysentery, polio, hepatitis 1854 Cholera Outbreak in London Recognized cholera cases were clustered around community water pump on Broad Street in London Dr. John Snow – protozoa – Parasitic worms Chicago 1885 Cholera Outbreak Sediment Pollution • Occurs when excessive amounts of suspended

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