Presentation on theme: "LIS Quiz 1 Review. What are the steps of Hypoxia? 1.Excess fertilizer is sprayed on hundreds of residential lawns. 2.Rain or runoff (CSO) brings nitrogen."— Presentation transcript:
What are the steps of Hypoxia? 1.Excess fertilizer is sprayed on hundreds of residential lawns. 2.Rain or runoff (CSO) brings nitrogen to rivers, then the Sound. 3.Excess nitrogen in the water causes an algae bloom. 4.The algae die in a short time and settles to the bottom of the water. 5.Bacteria decompose the dead algae using more oxygen as they multiply. 6.Dissolved oxygen levels become very low. 7.Fish leave and other less mobile animals weaken and die. 8.The animals that died from low oxygen levels decompose. Decomposers use more oxygen & the problem of low oxygen becomes worse.
Coliform Bacteria found in sewage and human waste
Combined Sewer Overflow (CSO) Release of untreated sewage & street runoff due to heavy rain
Nonpoint Source Pollution you can not identify the specific source
Pathogen Microorganisms that cause illness and disease
Point Source Pollution you can easily identify and know the specific source
Pollutant Anything in the air, water, or earth that is harmful
Primary Sewage Treatment Process that removes solids from wastewater.
Pycnocline Boundary between colder, saltier water at the bottom and warmer, less salty water on the surface – oxygen can’t cross
You should be able to… 1.Explain the difference between aerobic and anaerobic bacteria. 2.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. 3.Discuss the difference between the combined sewage system and the modern system. 4.Provide reasons why the modern system is better 5.To go above and beyond – mention problems that a modern system could have (news article)