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Chapter 20 Water Pollution Dontae Landley Laura Alzate Period 3.

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1 Chapter 20 Water Pollution Dontae Landley Laura Alzate Period 3

2 20-3 What Are the Major Pollution Problems Affecting Groundwater and Other Drinking Water Sources ?  Common pollutants such as fertilizers, pesticides gasoline and organic solvents can seep into ground water causing hella pollution.  When ground water becomes contaminated it cannot cleanse itself.  Ground water has lower concentration of dissolved oxygen and smaller population of decomposing bacteria. And that is why it is difficult to cleanse the water.  It can take decades to thousands of years for contaminated groundwater to cleanse itself.

3 Figure 20-11

4 Water pollution  Bacteria,Viruses,Protozoa, Parasitic worms  Oxygen demanding substances  Inorganic plant nutrients  Organic chemicals  Sediment or suspended matter  Thermal pollution  Genetic pollution

5  Ground water pollution is a very serious threat to the environment.  Ground water is curtail because it provides 70% of le countries drinking water.  By 2006, the EPA (environmental protection agency) had completed the cleanup of about 350,000 of the more than 460,000 underground tanks in the United States that were leaking gasoline into groundwater.  The clean up cost ranges from 10 thousand to 250 thousand.

6 Case Study  A natural threat from arsenic in groundwater Pg.544  Protecting water sheds instead of building water purification plants Pg.546

7 20-4 What Are The Major Pollution Problems Affecting Oceans?  40 % Of the worlds population live on or near a coast.  Coastal populations are expected to double by  80% of marine pollution originates on land.  80-90% of the pollution dumped into the water is not treated, and it could rise by 2050.

8 Figure 20-15

9  In deeper waters the ocean can dilute, disperse and degrade large amounts of raw sewage.  Dumping harmful waster into the ocean further degrades the vital part of earths life support.  Cruise ship cause equal amounts of pollution as a small city.  They also create a lot of plastic garbage, this garbage usually gets dumped around important ecosystems.  According to one study one fourth of people using coastal beaches in the US develop ear infections, eye irritation, and respiratory disease due to the pollution in the water.  Harmful algal blooms are called red, brown, or green toxic ties.  They release water born and air born toxins that damage fisheries and poison seafood.

10 Dead zones  200 oxygen-depleted zones  43 zones are known as “dead zones”  Dead zones have low oxygen levels, they contain few oxygen-consuming fish and bottom-dwelling organisms, but they abound with decomposing bacteria.

11  Crude petroleum comes out the ground.  Refine petroleum is processed products.  In 1989 Exxon Valdez tanker went off course and released 40.8 million litters of oil into Alaska's prince William.  Damaged 34 thousand fisheries in Alaska and the total cost was 4 billion.  Studies showed that the largest source of ocean oil pollution is urban and industrial run off from land.  Half of the oil reaching the oceans is dumped, spilled or leaked by city sewers, industries and people.

12  The key to protecting the ocean is to reduce the flow of pollution for land and air and from streams emptying into these waters.

13 20-5 How Can We Best Deal with Water Pollution?  Solutions to better water quality: 1. Drainage Area Management Plans 2. Agriculture plots Water Quality Act  1987 Water Quality Act-Main goals to make U.S. waters safe for fishing and swimming. Restore and maintain the chemical, physical, and biological integrity of nations waters.  Discharge trading policies under this program a permit holder can pollute at high levels than it is allowed if it buys credits from permit holders who are polluting below levels.  Case study pg 552

14  Primary sewage treatment of physical process that uses screens and grit tanks to remove large floating objects and allows solids to settle out  Secondary sewage treatment biological process which bacteria removes 90% of dissolved biodegradable waste.  These two together move 95-97% of organic waste. 70% of toxic. 70% of phosphorus and 50% of nitrogen.  Tertiary sewage series of specialized chemicals and physical process to remove specific pollutants.

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