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Transcript of Water Pollution
Agriculture also took a turn because many new fertilizers with chemicals were being used. Later in the 1940s the insecticide DDT had positive and negative effects.
Positive: Pests were killed and more food was harvested as a result. ($$$$$)
Negative: Killed many animals and caused runoff to have very high levels of Calcium. In 1962 Rachel Carson wrote The Silent Spring and warned the people of the dangers that tag along with chemicals. This is what began the environmentalist movement. 1965- Water Quality Act
1970- First Earth Day
1972- Clean Water Act
ALL OF THESE CREATED BETTER WATER QUALITY! Phosphates Test: If there is an excessive amount of algae, that means that there is an excessive amount of phosphates in the water. Sewer Lines Ditches Coliform Test: Determining if fecal matter will test positive for water-borne diseases. pH Test: Testing if the water is too acidic/basic using the pH scale. Turbidity Test: The turbidity, or cloudiness, of water determines the concentration of algae, nutrients, etc. Heat Test: Measuring how much heat is in waterways or bodies of water. Point Sources -are specific locations of pollutants.
-some of these locations include drain pipes Without these Nitrates usually, this can lead to symptoms include abdominal pain, diarrhea, muscular weakness or poor coordination. Affected animals will have blood that is a chocolate-brown color No enviromental impacts, but to humans it can cause cholera, typhoid, heptatis A, and dysentery which can lead to death. This can also lead to the killing of fish, because it can start the process of creating an algae bloom. There is no impact to humans in reasonable concentrations. If pH shifts in areas outside between 6-8, it creates less biodiversity because only certain groups species can live in those conditions. Usually Turbid water has particles that are attached to the water like diseases and heavy metals. If animals or humans drink the water, it could lead to disease or death. If heat is not it the correct temperature, it can create less biodiversity. Also can lead to less oxygen. Impacts of DO -If it is too low the fish will suffocate and die. -If it is too high then it will cause gas bubble disease which is also deadly for fish. DO has no human health impacts. When BOD is released into the water way:
-aerobic bacteria will eat food in the water ways responsible for aerobic respiration and this will result in the death of fish. BOD Environmental health impacts. Non-Point Sources -are broad and diffuse areas, rather than specific locations.
-Very hard to control because of how expensive and difficult it is to identify them.
This includes runoff of chemicals and sediment from cropland, livestock feedlots, urban street, and lawns. This causes increase in DO because of aeration, increase or decrease in temperature. and aerobic respiration. Livestock feedlots Urban streets Chemical runoff