1 / 11

Friday, Mar 7 th , 2014

Friday, Mar 7 th , 2014. Did you know… The Golden "Poison Dart" frog in S. America is the most poisonous vertebrate in the world. The acceleration rate of a flea's jump is 20x that of a space shuttle’s launch. Do Now: Mar 7 th. Where are estuaries located?

juliet
Télécharger la présentation

Friday, Mar 7 th , 2014

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Friday, Mar 7th, 2014 • Did you know… • The Golden "Poison Dart" frog in S. America is the most poisonous vertebrate in the world. • The acceleration rate of a flea's jump is 20x that of a space shuttle’s launch.

  2. Do Now: Mar 7th • Where are estuaries located? • Is point pollution or non-point pollution easier to clean up? Explain why you think that. • List 3 things that can pollute a water source.

  3. YouTube Friday

  4. Wastewater Treatment • Clean used water/sewage to safely return to environment • Mimic natural treatment processes in environment • 4 Steps:

  5. Step 1: Preliminary/Primary Treatment • Removes 40-60% of solids • Rags, plastics, sand/small particles, etc.

  6. Step 2: Secondary Treatment • Removes ~90% of pollutants • Helpful bacteria consume organic matter, then are removed from water

  7. Step 3: Sludge Treatment • Sludge/biosolids are treated & disposed • If chemical-free, can be used as fertilizer

  8. Step 4: Release Water • Restore oxygen: must have enough O2 to support life when returned to rivers/lakes • Release water into wetland, stream, field, etc. • http://www.youtube.com/watch?v=ubVabIVnNXk

  9. Measuring Water Quality • Monitor orgs in water • Mayflies cannot tolerate pollution, leeches thrive • Measure dissolved oxygen (DO) • More DO = more life • Good fishing waters: 9+ ppm (parts per million) • Measure turbidity • Water cloudiness • Low turbidity = better quality water

  10. Drinking Water Quality • National water standards est by EPA • ~ 5.6 million Americans drink water that doesn’t meet EPA standards • Public water: groundwater treated & pumped out • Well-tested = most safe • Private wells aren’t required to meet standards • 1 in 5 Americans drinks water from treatment plant that violated 1+ safety standard

  11. Is Bottled Water the Answer? • Nope! • 1/3 bottled water contaminated w/ bacteria • IBWA (International Bottle Water Association) standards only • Less strict than EPA standards • Costs more • Plastic bottles: • 1.4 million metric tons thrown away • Fossil fuels used to make them (oil used in U.S. each year would fuel 100,000 cars)

More Related