types of pollution nitrogen (wastewater, farming) pharmaceuticals garbage heavy metals (hg, zn,...
TRANSCRIPT
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POLLUTION
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Types of Pollution
Nitrogen (wastewater, farming)
Pharmaceuticals Garbage Heavy metals (Hg,
Zn, Pb, Fe) Chemicals (PCB’s,
industrial waste) Petroleum
products
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Entry: Water Cycle
Circulation of water in Earth Evaporation: changing of water from
liquid to gas Transpiration: Release of water vapor
from plant leaves Condensation: changing of vapor to
liquid (cooled down) Precipitation: Water that returns to the
earth
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Water Cycle
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Water Cycle and Pollution
Rivers and streams transport nutrients, salts, sediments, and pollutants from watersheds to estuaries ( through runoff) and ultimately to ocean
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Connecticut Watershed
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Sources of pollution
1. Nonpoint source:--- many smaller point sources Occurs as a result of runoff Caused by:
septic tanks, cars, trucks, boats, farms, ranches, construction sites, cities, etc.
Hard to manage Loss of aquatic species diversity, damage
to coral reefs, algae blooms, sea grass bed decline, closure of beaches (swimming) and shelfish beds
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2. Point source pollution Pollution originates from an identifiable
source Ex: oil spills, algae blooms, industrial
plants, sewage pipes
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Nitrogen
Fertilizers Overfertilization of
crops Runoff
Treated and untreated sewage Wastewater
released from treatment plants
Combined sewer overflows (CSO’s)
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Pharmaceuticals
• Have negative effects on the reproduction of aquatic species and stimulate the development of antibiotic resistant bacteria
• Titanium, zinc, mercury
Medications and hormones that have been used or discarded Treated and untreated
sewage Landfills
Vetranary medications Aquaculture (fish farms) Cattle feed lots
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Garbage
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Plastic, debris, chemical sludge trapped by currents in North Pacific
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Pacific Garbage Patchhttp://
www.youtube.com/watch?v=rTZUVjF69eg
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Chemicals
Mercury & copper Power plants
Lead gasoline
Chromium, copper, arsenic, & zinc Boats and pilings
PCB’s Pesticides (DDT)
copper
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Deepwater Horizon Oil Spill-2010 April 20 to July 15 4.9 million barrels of oil (210 million gal) Had to engineer a solution
Exxon Valdez Oil Spill- 1989 11 million gal Covered 1,300 miles of coastline Covered 11,000 square miles of ocean Resulted in numerous environmental
sanctions
Petroleum