1. Water Pollution and Treatment
Chapter 21
Water Pollution and Treatment
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Environmental Science 5e

2. Environmental Science 5e
Look at charts in Text…
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3. Biochemical Oxygen Demand
The amount of oxygen required for biochemical decomposition process
3 zones
A pollution zone
An active decomposition zone
A recovery zone
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4. Environmental Science 5e
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5. Environmental Science 5e
Waterborne Disease
Outbreaks of waterborne diseases
Milwaukee, WI
Cryptosporidium Flu-like symptoms
Fecal Coliform Bacteria
Includes E. Coli (200/100ml for swimming)
Walkerton, ON
E. Coli outbreak (manure in water system)
Not advised to boil
Very young and old suseptable
Gastrointestinal illness
Vigilant about testing
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6. Environmental Science 5e
Nutrients
Eutrophication
The process by which a body of water develops a high concentration of nutrients
Oligotrophic
Low concentration of nutrients
Cultural Eutrophication
When eutrophication is accelerated by human processes that add nutrients to a body of water
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7. Environmental Science 5e
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8. Environmental Science 5e
Exxon-Valdez
1989 – oil spill recovery inadequate
11 million gallons oil spilled
14% collected
Seals, otters, seabirds died
Jessica – spill near Galapagos Ils.
Concern for environment, winds carried most away
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9. Environmental Science 5e
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10. Environmental Science 5e
Acid Mine Drainage
Water with a high concentration of sulfuric acid that drains from mines
Serious water pollution problem
Damages aquatic ecosystems, pollutes bodies of water and degrades water quality
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11. Surface Water Pollution
Water Pollutants are emitted from
Point Sources
Distinct and confined sources such as pipes from industrial or sites
Nonpoint Sources
Diffused and intermittent
Ex) runoffs from streets
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12. Groundwater Pollution
Bioremediation:
a method of treating groundwater pollution problems that utilizes microorganisms in the ground to consume or break down pollutants
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13. Environmental Science 5e
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14. Environmental Science 5e
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15. Environmental Science 5e
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16. Environmental Science 5e
Wastewater Treatment
Septic Tank Disposal Systems
Waste Treatment Plants
Primary Treatment (large organic matter)
Secondary Treatment (aerobic bacteria)
Advanced Treatment (discharged to surface)
Chlorine Treatment (disinfectant)
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17. Environmental Science 5e
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18. Wastewater Renovation and Conservation Cycle
Steps:
1. Return of treated wastewater to crops
2. Renovation or natural purification by slow percolation of the wastewater into soil to eventually recharge the groundwater resource with clean water
3. Reuse of the treated water
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19. Environmental Science 5e
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20. Environmental Science 5e
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21. Environmental Science 5e
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22. Environmental Science 5e
Water Reuse
Inadvertent:
water is withdrawn, treated and returned to the environment
Indirect:
Ex) the wastewater renovation and conservation cycle
Direct:
The use of treated wastewater that is piped directly from a treatment plant to the next user
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Environmental Science 5e

23. Water Pollution and Environmental Law
The branch of law dealing with conservation and use of natural resources and control of pollution
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