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LIS Quiz 1 Review

LIS Quiz 1 Review. What are the steps of Hypoxia?. Excess fertilizer is sprayed on hundreds of residential lawns. Rain or runoff (CSO) brings nitrogen to rivers, then the Sound. Excess nitrogen in the water causes an algae bloom.

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LIS Quiz 1 Review

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  1. LIS Quiz 1 Review

  2. What are the steps of Hypoxia? • Excess fertilizer is sprayed on hundreds of residential lawns. • Rain or runoff (CSO) brings nitrogen to rivers, then the Sound. • Excess nitrogen in the water causes an algae bloom. • The algae die in a short time and settles to the bottom of the water. • Bacteria decompose the dead algae using more oxygen as they multiply. • Dissolved oxygen levels become very low. • Fish leave and other less mobile animals weaken and die. • The animals that died from low oxygen levels decompose. Decomposers use more oxygen & the problem of low oxygen becomes worse.

  3. Coliform • Bacteria found in sewage and human waste

  4. Combined Sewer Overflow (CSO) • Release of untreated sewage & street runoff due to heavy rain

  5. Nonpoint Source • Pollution you can not identify the specific source

  6. Pathogen • Microorganisms that cause illness and disease

  7. Point Source • Pollution you can easily identify and know the specific source

  8. Pollutant • Anything in the air, water, or earth that is harmful

  9. Primary Sewage Treatment • Process that removes solids from wastewater.

  10. Pycnocline • Boundary between colder, saltier water at the bottom and warmer, less salty water on the surface – oxygen can’t cross

  11. Sanitary Sewers • Sewers carrying human waste

  12. Secondary Sewage Treatment • Process that removes organic matter from sewage

  13. Sewage • Water carrying waste - wastewater

  14. Sewer Systems • Complex of pipes and pumps carrying wastewater to sewage treatment plants

  15. Storm Sewers • Sewers carrying road and parking lot runoff

  16. Wastewater Treatment Events • Plant Influent through sanitary sewers • Bar Screens • Primary Clarifiers • Biological Reactors (bacteria) • Secondary Clarifiers • UV Disinfection • Clean Effluent Discharge

  17. Plant Influent • Water that comes from sanitary sewers and enters the plant

  18. Bar Screens • Remove items larger than 0.75 inches – so the pipes do not get clogged

  19. Primary Clarifiers • Removes about 50% of solids/sludge

  20. Biological Reactors • Microorganisms digest sewage

  21. UV Disinfection • After this process pathogens can no longer reproduce

  22. Solids Processing • Solids are dewatered

  23. You should be able to… • Explain the difference between aerobic and anaerobic bacteria. • Identify which type of bacteria is used in a septic tank and which type is used at a waste water treatment plant and explain why. • Discuss the difference between the combined sewage system and the modern system. • Provide reasons why the modern system is better • To go above and beyond – mention problems that a modern system could have (news article)

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