Fantle_water_pollution_studentnotes

Fantle_water_pollution_studentnotes - Short-term human...

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Short-term human impact Short-term human impact Water Pollution Water Pollution
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Overview questions Overview questions What pollutes water, where do these pollutants come from, and what effects do they have? What are the major water pollution problems in streams and lakes? What causes groundwater pollution, and how can it be prevented? What are the major water pollution problems affecting oceans? How can we prevent and reduce surface water pollution? How safe is drinking water, and how can it be made safer?
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Water pollution: sources, types, and effects Water pollution: sources, types, and effects Water pollution : any chemical, biological, or physical change in water quality that has a harmful effect on living organisms or makes water unsuitable for desired uses Point source: specific location • Factories, drain pipes, ditches, sewer lines meat-processing plants, chemical dumps, untreated muncipal sewage outlets, etc. .. Nonpoint source: cannot be traced to a single site of discharge • Roads, lawns, rural areas, atmospheric deposition, agricultural/industrial/residential runoff, etc. ..
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Point Source: mineral processing plant Point Source: mineral processing plant Point source Point source
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Farms, Farms, lawns, and lawns, and golf courses golf courses Fertilizers, herbicides, and pesticides Animal feedlots (also non-point source) Sewage treatment plants Point sources of water pollution Pollutant Non-point sources of water pollution Factories and Factories and disposal sites disposal sites Nutrients, waste, and bacteria Salt on winter roads; oil, grease, and chemicals from urban runoff Industrial waste and toxic chemicals Residential Residential neighborhoods neighborhoods and urban streets and urban streets Construction Construction sites, and sites, and deforested and deforested and overgrazed overgrazed land land Eroded soil Oil spills Abandoned mines Abandoned mines (also point source) (also point source) Acid drainage Oil tankers
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Non-point sources Non-point sources
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Types of water pollution Types of water pollution
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Because of industrial agriculture
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Organic pollutant + oxygen -> degraded pollutant + by-product
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Water quality and dissolved oxygen (DO) content in parts per million (ppm) at 20°C Only a few fish species can survive in water less than 4ppm at 20°C Miller, Figure 21-3 Miller, Figure 21-3
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Pollution of freshwater streams Pollution of freshwater streams Flowing streams can recover from a moderate level of degradable water pollutants if they are not overloaded and their flows are not reduced In a flowing stream, the breakdown of degradable wastes by bacteria depletes DO and creates an oxygen sag curve This reduces or eliminates populations of organisms with high oxygen requirements
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Water Pollution Problems in Streams Water Pollution Problems in Streams Dilution and decay of degradable, oxygen-demanding wastes and heat in a stream Miller, Figure 21-4 Miller, Figure 21-4
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Fantle_water_pollution_studentnotes - Short-term human...

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