How Municipal Water Travels In A City

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This is part of the educational series that http://schools.indiawaterportal.org has introduced. This presentation is aimed at allowing the teaching and parent community to explain the existing and potential problems of water mismanagement in our world. This is part of the creative common license

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  • How Municipal Water Travels In A City

    1. 1. Municipal Water and Wastewater treatment
    2. 2. Magic!!!
    3. 3. Magic!!!
    4. 4. Magic? Not really
    5. 5. I come from a RIVER in your state
    6. 6. Magic? I come from a LAKE or a RESERVOIR close to your city
    7. 7. I come from deep UNDER THE GROUND . In the river bed and other places, there are borewells through which I come out during the summer months
    8. 8. I come from the SEA …. but what follows is not my story, because I go through a different path before I reach you.
    9. 9. A big pipe sucked us in
    10. 10. Along the way, there was a mesh We could go through but 3 friends of ours (pebble, stick and leaf) couldn’t make it.
    11. 11. A pipe sucked us in Along the way, there was a mesh. We could go through but 3 friends of ours (pebble, stick and leaf) couldn’t make it. A pump pushed us a long distance until we reached this big factory like place called ‘Water treatment plant ’ There were boards all around which said ‘ Restricted Area’. I wonder why . Do you know?
    12. 12. Flocculation From a dark gloomy pipe where we were really rushed, we reached a BIG tank. When we were resting, something called Aluminium Sulphate (let’s call him ALUM ) and some of his friends joined us.
    13. 13. Flocculation Alum and his friends are very sticky and my pals ‘Dirt’ from the river, who managed to pass the mesh earlier on, got really attracted to them.
    14. 14. Flocculation Alum and friends, along with ‘Dirt’ stuck together. We called them ‘ FLOC ’
    15. 15. Flocculation Alum and friends, along with ‘Dirt’ stuck together. We called them ‘ FLOC ’
    16. 16. Flocculation We were then stirred and churned around and the ‘ FLOC ’ started getting bigger with more dirt sticking around. We also saw many more ‘flocs’ forming
    17. 17. <ul><li>We were then pushed into another tank. Ah! Rest at last. </li></ul><ul><li>This was called the sedimentation tank. Hey! the flocs are sinking. </li></ul><ul><li>The big ones are going down first. </li></ul><ul><li>Our friend ‘Dirt’ has gone down too with his ‘floc’ </li></ul><ul><li>We were in this tank for about 2 hours and by then all the flocs had sunk down below and formed a gooey mass called ‘sludge’ </li></ul>Sedimentation
    18. 18. Rapid sand filtration <ul><li>We then passed quickly through another tank with a layer of sand and gravel </li></ul><ul><li>Little flocs and some dirt that did not get into flocs, got trapped in the sand </li></ul>
    19. 19. Chlorination <ul><li>A small amount of chlorine was then added to our tank, which killed pathogenic bacteria, protozoa, viruses, helminths and other micro organisms. </li></ul>http://www.cpcb.nic.in/oldwebsite/New%20Item/status-WTP-In-India/Chapter1%20.rtf will give you some more information on municipal water treatment systems in India
    20. 20. We then travelled a large distance Photo by C C Krause; Source: http://www.flickr.com/photos/charleskrause/3185090628/ through pipes
    21. 21. to large tanks within your city Photo by John Brian Silverio; Source: http://www.flickr.com/photos/psilver/2280385292
    22. 22. And from there to overhead tanks near your school Photo by BockBilbo; source: http://www.flickr.com/photos/bockbilbo/247405160/
    23. 23. We got to your school this morning and here we come…….. Out of your tap
    24. 24. Waste water treatment <ul><li>Once you wash your hands with us or flush us down the toilet, we go down through the drains of your school, and through bigger drains under your city and reach a waste water treatment plant. </li></ul>Our story doesn’t end here
    25. 25. This is what we look like when we reach the wastewater treatment plant We’re full of poop, soap, oil, grease, soil, garbage, chemicals….all kinds of stuff Photo by flippy rice; Source: http://www.flickr.com/photos/flippy/110659044/
    26. 26. Sedimentation <ul><li>All the solid stuff is separated out </li></ul><ul><li>We then go to sedimentation tanks where the sludge settles down and oil and grease float on top. </li></ul><ul><li>Both these are removed </li></ul>Photo by Benjamin Pender; Source: http://www.flickr.com/photos/benpender/2432095138/
    27. 27. Trickling Filter <ul><li>We trickle on to a bed of rocks and gravel on which a layer of microbes are present. </li></ul><ul><li>Bacteria, protozoa and fungi on this bed </li></ul><ul><li>eat up the organic matter in the sewage </li></ul>Photo by Naturenet; Source: http://www.flickr.com/photos/naturenet/199836849/
    28. 28. Aeration <ul><li>Air is pumped through us in aeration tanks </li></ul><ul><li>We may go through another round of the trickling filter </li></ul><ul><li>Sometimes we go through a tertiary treatment system where chemicals are added to purify us </li></ul><ul><li>Then we rejoin a stream </li></ul>
    29. 29. A recap – water treatment Primary Filters (to remove large matter) Flocculation tank Sedimentation tank Rapid / slow sand filtration Chlorination Water from rivers / lakes To tanks in the city
    30. 30. A recap – waste water treatment Grit Filters (to remove large matter) Sedimentation tank Trickling filter Aeration Secondary filters Wastewater from city To stream Tertiary treatment

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