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Published byBruno Daniel Modified over 9 years ago
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Water Quantity and Quality
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What is Water Pollution? any physical (temperature, oxygen), chemical (mercury), or biological (disease, sewage) change to water that adversely effects its use by living things
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Types of Water Pollution 1.Biological 2.Chemical 3.Physical Measured in: Percent (%) Parts per thousand (‰) Parts per million (ppm) Parts per billion (ppb)
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Biological Water Pollution 1.Infectious Disease (Pathogens) 2.Oxygen-Demanding Waste Direct (microbes in water): Typhoid, cholera, dysentery, hepatitis… Entamoeba histolytica
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Biological Water Pollution 1.Infectious Disease (Pathogens) 2.Oxygen-Demanding Waste Indirect (Water breeding carriers): malaria, yellow fever, west nile virus…
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Coliform Test Detection: Solutions: Sewage treatment Immunization
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Biological Water Pollution 1.Infectious Disease (Pathogens) 2.Oxygen-Demanding Waste
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Chemical Water Pollution 3.Nutrients (Fertilizers) 4.Oil 5.Fossil Fuel Emissions (Acid Rain) Nitrogen, phosphorous
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Chemical Water Pollution 3.Nutrients (Fertilizers) 4.Oil 5.Fossil Fuel Emissions (Acid Rain)
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Chemical Water Pollution 3.Nutrients (Fertilizers) 4.Oil 5.Fossil Fuel Emissions (Acid Rain)
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Physical Water Pollution 6.Suspended Matter 7.Thermal Pollution 8.Food Waste East Pacific Garbage Patch http://www.localphilosophy.com/ articles/great-pacific-grabage- patch.htm
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Physical Water Pollution 6.Sediment 7.Thermal Pollution 8.Food Waste Causes: industry dams removal of vegetation Optimum – Fish 5-20°C (salmon <12°C)
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Physical Water Pollution 6.Sediment 7.Thermal Pollution 8.Food Waste Dangers: Bacteria feed on sugar Can cause out of control bacterial growth in water
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Turbidity refers to how clear the water is greater the amount of total suspended solids (TSS) in the water, the murkier it appears = the higher turbidity
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Measured in: NTU ( Nephelometric Turbidity Units) Normal levels: 1-50 NTU Drinking Water: 0.5-1 NTU Visible: >5 NTU Higher during storms
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Dissolved Oxygen Added by: turbulent water and photosynthesis Removed by: Increased temperature and respiration/decomposition Good: > 6 ppm (mosquitoes can survive in 1 ppm) (also measured in % of maximum - Good = 60-80%)
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Acidity (pH) 6.5-8.2 normal (rainwater is usually a little acidic) >9 – harmful to fish (inc. salmon) <5.5 releases metals in seds, bacteria die and organics don ’ t decay <5 insects die and fish eggs don ’ t hatch <4 lethal to adult salmon
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Dissolved Carbon Dioxide Added by: respiration/decomposition & weathered rock Removed by: Increased temperature and photosynthesis Good: 1-10 ppm (usually about 1 ppm)
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Nitrates Typically: 0.1-4 ppm Unpolluted usually below 1 ppm Sewage pollution increase up to 20 ppm
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