Presentation on theme: "WATER POLLUTION Chapter 11. What is Pollution? 1.Describe water pollution that you have seen 2.Why do you believe that it was pollution? 3.What sensory."— Presentation transcript:
What is Pollution? 1.Describe water pollution that you have seen 2.Why do you believe that it was pollution? 3.What sensory cues did you use? 4.Why did this info tell you it was pollution?
Pollution Any chemical, biological, or physical change in water quality that has a harmful effect on living organisms or makes water unsuitable
How would you define a point source and a nonpoint source?
Where does the pollution come from? Point source = single, identifiable source -can you point your finger at the polluter? Nonpoint source = many sources, hard to identify -the pollution could be from many sources – hard to point your finger at the culprit
Point Sources of Pollution Gets into the water from… –Pipes, ditches, sewers into bodies of surface water Some examples… 1.sewage treatment plants 2.Factories 3.Landfills 4.Mines 5.Oil wells
Non-Point Sources of Pollution Gets into the water from… –Runoff, subsurface flow, air Some examples… 1. Soil from construction sites and farms 2. Storm-water runoff (oil, dog poop, litter, gas) 3. Pesticides and fertilizers 4. Agricultural feces 5. Salt for snow and ice
Which is a bigger problem? ~ Nonpoint source pollution Which is easier to eliminate? ~ Point source pollution
Types of Pollution Chemical Thermal Artificial Eutrophication Genetic Ocean Groundwater Wastewater
Artificial Eutrophication Algal blooms caused by too much Nitrate and Phosphate in the water Reaches the water by runoff from... 1. farms 2. lawns 3. sewage treatment plants
Remember why nutrients are bad… Too much N and P leads to LOTS of plant growth –mostly algae Eventually block out sun Plants die increase decomposers use up O 2 kill fish
Surface water vs. Groundwater Which is generally more polluted? ~ Surface Water Which is harder to clean up? ~ Groundwater
Groundwater pollution sticks around... Very cold, no bacterial breakdown Very slow water movement: recharge can take 100’s or 1000’s of years Pollutants can stick to rocks in aquifer and pollute new water
Case Study: Natural Gas Drilling Marcellus Shale Fracking - Hydraulic Fracturing Loophole in Safe Water Drinking Act –natural gas companies don’t have to disclose chemicals being used http://gaslandthemovie.com/
How can we protect groundwater? Prevention is the key… –Monitor aquifers & landfills –Requirements for old fuel tanks Leak detection system Liability insurance –Stricter regulations on toxic waste disposal Above-ground storage of toxic waste...but then you have toxic mud spills!
Water pollution laws 1.Recreation: Water fit for fishing and swimming, cleaned up locally (1972 Clean Water Act) 2.Oceans: Controlled dumping of waste and required double hulled tankers to prevent oil spills (Oil Pollution Act) 3.Drinking Water: Protect groundwater and surface water from pollution (1975 Safe Drinking Water Act)