Wastewater

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Introduction to the process of wastewater filtration and reuse

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  • If you are out in the desert far from anywhere and you need to go … so you do … and you bury it … no big deal. But what if everyone in Tucson tried to do that? Yuck!
  • See page 136 of your textbook
  • Think of ways to keep water clean … see page 136 of your textbook.
  • Wastewater

    1. 1. BELLWORK <ul><li>Answer the following on your slates: </li></ul><ul><li>What is our most precious resource? </li></ul><ul><li>What is the one thing that no organism on Earth can survive without for more than a few days? </li></ul>
    2. 2. Wastewater Or … After you go … where does it go?
    3. 4. Why should we even care? <ul><li>After all … </li></ul><ul><li>Nature can decompose and clean up organic waste with impressive efficiency </li></ul><ul><li>… right ? </li></ul>
    4. 5. Sure … <ul><li>… but only if we don’t let it get out of control </li></ul>The problem … … too much waste in confined areas.
    5. 6. One Solution <ul><li>… modern wastewater treatment plants, </li></ul><ul><li>because without them … </li></ul><ul><li>we’d be in deep … </li></ul>… trouble!
    6. 7. History of Sewage Treatment <ul><li>Trash, wash water, and sewage dumped in the streets </li></ul><ul><li>Drainage channels </li></ul><ul><li>Cesspools </li></ul><ul><li>Night soil </li></ul><ul><li>Outhouses </li></ul><ul><li>Septic tanks </li></ul><ul><li>Sewers </li></ul>
    7. 8. So … what is wastewater and wastewater treatment? <ul><li>Wastewater is water that has been used: for washing, flushing, or in a manufacturing process, and so contains waste products; in other words … sewage. </li></ul><ul><li>Wastewater treatment does what nature does … cleans it for re-use … only many, many times faster. </li></ul>
    8. 9. The Modern Sewage Cycle Sewage Cycle Shower or flush Sewers Treatment Plant Treated Effluent Potable Water How it all works
    9. 10. Tucson <ul><ul><li>Tucson has 11 wastewater reclamation facilities </li></ul></ul><ul><ul><li>The two biggest are Ina and Roger Road </li></ul></ul><ul><ul><li>Ina Road treats about 25 mgd </li></ul></ul><ul><ul><li>(in other words … 20,000 gallons/minute) </li></ul></ul><ul><ul><li>Roger Road treats about 35 mgd </li></ul></ul><ul><ul><li>Estimate the size of the container you </li></ul></ul><ul><ul><li>would need to hold a million gallons </li></ul></ul><ul><ul><li>of water …? </li></ul></ul>
    10. 11. Answer <ul><li>You would need a cylindrical tank 80 feet wide by 26.7 feet high! </li></ul><ul><li>… and now remember that </li></ul><ul><li>just the Ina & Roger Road Treatment facilities </li></ul><ul><li>handle 60 of these … per day ! </li></ul>
    11. 13. Points to Ponder <ul><li>So … can we wash (recycle) water? </li></ul><ul><li>Is this the best way to keep water clean? </li></ul><ul><li>Remember the water cycle? </li></ul><ul><li>A ll water is recycled water. </li></ul><ul><li>There is no new water on Earth! </li></ul>
    12. 14. Final thought ... <ul><li>Please remember </li></ul><ul><li>When you throw or flush something “away” </li></ul><ul><li>... it isn’t “gone” </li></ul><ul><li>It is just someplace else … </li></ul><ul><li>and someone else’s problem </li></ul><ul><li>The trouble is … </li></ul><ul><li>there IS no place else … </li></ul>
    13. 15. Please take care of it … … this is all the water we have!
    14. 16. 75% of Earth is water Remaining 25% 97% of the water is ocean (salt water) Remaining 3% is fresh water Most of this is locked up in icecaps and glaciers (2.38%) This tiny sliver represents the 0.62% of Earth’s water that is in lakes, rivers, and underground sources The white (0.6%) is the underground water and the peel ( 0.02% ) is surface fresh water

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