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Homework: Desalination

Hi Guys,

After many discussions today on various scientific processes, it was clear that the meaning of ‘desalination’ needed clarification. For homework, I thought it would be a good idea if we further investigated the meaning of ‘desalination’ and how this scientific process helps the world we live in. Research, read or listen to any recent newspaper article, blog or you tube video about ‘desalination’ and post a comment about any ‘new learning’ that occurred for you. Please make sure you don’t simply  define ‘desalination’ in your blog post, as we already talked about this in class today.

Thanks guys for being a  great and confident bunch of students to work with.  Hopefully I get to have you again soon!

Miss Jacqui 🙂

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  1. Pin
    April 28, 2011 at 3:35 pm

    Desalination it means when you get salt out of salt water so that it can be fresh water, or the process of removing salt, from sea water so that it can be used for drinking or other uses.

    • Yeachan
      April 28, 2011 at 3:45 pm

      I agree with Pin because I asked my mom what desalination means and she said that desalination is the process of removing salt from sea water so that it can be used for drinking or washing hands.
      This is a video of desalination.

      OR,http://www.youtube.com/watch?v=M2DylWNmh-s

      • Yeachan
        April 28, 2011 at 3:46 pm

        Oh I’m commenting with Saeyeon.

        • Pin
          April 28, 2011 at 4:13 pm

          Yes like me and May also comment together

          • Pin
            April 28, 2011 at 4:13 pm

            I’m supposed to reply on Yeachans comment

        • Terrie
          April 28, 2011 at 7:36 pm

          How can you do like you and Pin’s comments was at Last!!??

        • Terrie
          April 28, 2011 at 7:37 pm

          How can you do to keep you and Pin’s comments at last??!!

          • Terrie
            April 28, 2011 at 7:38 pm

            Sorry my compter doesn’t work!

  2. May
    April 28, 2011 at 3:36 pm

    Desalination means when you remove salt from sea water so that it can be normal water and we can drink it. I agree everything with Pin because we found the definition together. 🙂

    • May
      April 28, 2011 at 4:35 pm

      This is the infomation I found: Desalination produces drinking water by removing dissolved salts rand other impurities from seawater or brackish water. Water supply from a desalination plant is not dependent on the climate and is therefore available continuously all year round.
      This is a website that you might find more information about desalination: http://www.goldcoast.qld.gov.au/attachment/goldcoastwater/EBWS_FS4.pdf

      • 18kenp
        May 1, 2011 at 2:29 pm

        I used that website too it was cool.

  3. 18saeyeono
    April 28, 2011 at 3:49 pm

    I agree with Pin because I read a science book about water long ago and I remember that the salt water eveperates the sea water and make it into the salt. And the people who did that which is a salt farm will sell the salts. ( Yeachan is in my house to do homework with me)
    The Desalination means that the water which is mixed with salt and then Fesalination have to combine those two into half.

    • Terrie
      April 28, 2011 at 4:31 pm

      I agree with Saeyeon.

    • 18saeyeono
      April 28, 2011 at 8:30 pm

      i watched Modern Marvels in History chennel about salts today and I found about how does the sea water turns in to the clean water. I also learned that machines uses salts to make it work and the solar powered energy tower in somewhere in deasert there are saults in the top of the tower. The saults help to provide the light to come to the generator.

  4. Am
    April 28, 2011 at 4:19 pm

    Desalination means the action of cleaning saltwater by removing the salt. It’s like having a cup of sea water, go through the process (which I am not sure what exactly people do), then you have a cup of fresh water.
    Desalination is used for changing sea water to drinkable water or cleaner water which is saltless.
    Something that I learnt was that: Desalinate is like ‘de-salt’, and ‘de’ means to reduce or take away so it’s like taking away the salt.
    I watched this youtube video: http://www.youtube.com/watch?v=gA_XVxhBmTQ; and I found out that the more people we have, the more water we need. I have honestly always thought that we had millions of tons of sea water-and I never knew we truly needed more. The main desalination process is called ‘multi-flash-desalination’, which is using heat to evaporate water, and leaving salt behind. Reverse-osmosis-desalination is pumping water through filters. Australia have desalination plants which are running by renewable energy, and it’s reducing their environmental footprint which is making their environment better.

  5. Pimboon
    April 28, 2011 at 4:20 pm

    I agree with Pin, May, Sae-Yeon and Yeachan that Desalination means to remove salt from seawater and once you remove it with this machine thing, you would get fresh water which is quality drinking water. 🙂

  6. michaelt
    April 28, 2011 at 4:35 pm

    Desalination is the process when you remove salt from sea water to make it drinking quality water. I think this is a important process because we could soon run out of drinking water and the only water left will be ocean water which has salt in it and salt water makes you thirsty and affects your body.

  7. April 28, 2011 at 4:46 pm

    There’s all kinds of desalination, but I chose water desalination is a process that removes salt,and other mineralsto create fresh drinkable water. This big machine pumps water through filtracion membranes. But I know what the first word means leaking and plus I don’t know what the second word means or even don’t know the spelling. Anyway, people all over the world are London,Australia,Israel and etc started doing their own freshable water place. Plus I got this from youtube and some of the words of the speaker was saying was so hard to spell.

    • April 28, 2011 at 4:47 pm

      Plus I wrote on the paper so I can remember about that. Mabye, I can bring the paper to show to the class.

  8. Terrie
    April 28, 2011 at 4:48 pm

    Desalination mean like cleaning the salt in sea water, and turn to drinking water. When i was using research how to Desalination the sae water, there are 4 way to clean that:
    1.Thermal method (distillation and freezing),
    2.mechanical energy law (pressure dialysis and reverse osmosis),
    3.power law (electrodialysis)
    4.chemical energy method (solvent extraction and ion exchange method). Desalination methods are commonly used in distillation, reverse osmosis and electrodialysis.
    When I was doing researching, I type Chinese, so I use google translte to English.
    This other research, and other way to clean the salt in sea water, and one research is how to get the salt from sea:
    In the sea, if there is no ion exchange resin desalting agent, you can use pot to collect distilled water to make desalination methods. When boiling water, towels affixed inside the lid, the absorption drops of distilled water in a towel, and then screw in the large shell or other containers. This repeated production of fresh water needed can be obtained. World War II, some Chinese and British seamen, in the absence of deserted desert island, that is in a similar way, large quantities of fresh water while maintaining the manufacturing life of 76 days, until finally rescued by British aircraft discovered.
    In winter, water can be frozen in a container. When the frozen water, most of the salt dissolved in water from the water will be crystal and, therefore, is basically a weakening of the ice.

  9. Ken
    April 28, 2011 at 4:48 pm

    Desalationmeans the process of removing salt, espesialy from sea water so that it can be used for drinking or irrigation.http://dictionary.reference.com/browse/desalination this is the Link.

    I also searched how you can turn salt sea water to drinking water. here are the steps.

    1.Get a pot and put an empty glass cup inside it in the center.

    2.Slowly pour some salt water into the pot…. Do not over fill. Stop well before the water level has reached the mouth of the glass. Make sure no salt water splashes into the glass while boiling.

    3.Place the pot cover upside down so the highest point or handle is facing down right above it and facing the glass.

    4.Bring the water to a slow boil. A violent full boil can contaminate the drinking water by splashing into the glass.

    5.As the water boils it becomes vapour, which condenses in the air as steam and on the cover’s surface as water droplets, which fall right into the glass. As you probably know, when water boils, it becomes pure vapour, leaving behind anything that was dissolved in it. (This will probably take 20 minutes or more.)

    6.Wait a little while before drinking the water from inside the glass, since both the water and the glass will be very hot. I got all of the info. from http://www.wikihow.com/Turn-Salt-Water-Into-Drinking-Water

    I found a Video about it to you guys should watch it mabye. Here is the URL http://www.youtube.com/watch?v=XO4VmMRm8Gk&feature=player_embedded

  10. Manisha
    April 28, 2011 at 6:10 pm

    Desalination is means to make salt water into fresh water by removing the salt,minerals and other things so we can use the fresh water for drinking and other uses.

    This is the website where you can find more about desalination-http://www.youtube.com/watch?v=gA_XVxhBmTQ

  11. Jin
    April 28, 2011 at 6:21 pm

    Desalinisation refers to any of several processes that remove some amount of salt and other minerals from water. More generally, desalination may also refer to the removal of salts and minerals. But I think that it will take a long time to remove salt from the water because it’s very hard to get fresh water from the sea. Only if we can drink salt and salt can become precious water but people are polluting them! Besides, I agree with all of you.

    • Jin
      April 28, 2011 at 8:52 pm

      I read this in wiki

      en.wikipedia.org/wiki/Desalination

    • Jin
      April 28, 2011 at 10:14 pm

      adding on to that, the world’s largest desalination plant is the Jebel Ali Desalination Plant

  12. April 28, 2011 at 6:28 pm

    Desalination means the removal of salt, it’s the process of making sea water into drinkable water. There are good parts and bad parts about this process. The good part is that we are taking sea water and making it drinkable water which helps people who don’t get clean water, it also is another option for getting water when all clean water has gone meaning runs out. This is future thinking. The bad parts about this are they use lots of energy.

    Desalination plants are rated in the top 50 factories using the most amount of energy. Another bad part is it using a lot of money and that means that not many countries have adopted this idea.

    The top 5 countries which have invested in the idea are: Saudi Arabia, UAE, USA, Israel and China. Australia has tried to make a more positive outlook on desalination by using renewable energy for the whole factory. Their energy bill has reduced by around 75%. An example of renewable energy is windmills.

    84% of desalination plants remove the salt by using the two processes of evaporation and condensation. Meaning if you boil some salt water for a long period of time the water will evaporate and the salt will be left behind.

    • April 28, 2011 at 6:29 pm

      I got most of my information using the youtube clip which I recomend a lot.

    • Jin
      April 28, 2011 at 8:58 pm

      Wooh Aayush so these contries must have lots of salt remaining! 😮

      • May 1, 2011 at 12:06 pm

        Yes correct. They also earn money by selling the salt to other countries.

  13. Paul
    April 28, 2011 at 6:41 pm

    I watched a show on You-Tube called The Planet 100 here is the link: http://www.youtube.com/watch?v=gA_XVxhBmTQ. I found out that the main way that they Desalination water is by multi stage flash Desalination process and another way to do it is reverse osmosis Desalination and that is another way but not the main one. The top 7 Countries are: Saudi Arabia, The United Arab Emirates,
    USA, China, Israel, England and Australia. Water Desalination seems like it can save lives.

  14. Anirudh
    April 28, 2011 at 6:45 pm

    Desalination means to remove the salt and other minerals from sea water, usually to make it drinkable. It is important to purify the water before you drink it. In class today I learned the word desalination. In simpler words De-salt and De means reduce and salt is salt. Desalination is normally used on seagoing ships or submarines.

    The world’s largest desalination plant is the Jebal Ali Desalination Plant in the United Arab Emirates.

    This is the website I got some of the information: http: //en.wikipedia.org/wiki/Desalination

    • Jin
      April 28, 2011 at 10:13 pm

      Anirudh you and I got the same website too! 😀

  15. sebastian
    April 28, 2011 at 7:03 pm

    Desalination means to take salt water and change it to fresh water that we can drink. The first step of desalination is boiling the water. The main part of desalination is called Malty Stage Flats Destination is when the water evaporates and leaves the salt behind. It helps the world a lot because it gives humans more fresh water and you could do it using the energy from the sun and wind.

  16. jon jon
    April 28, 2011 at 7:17 pm

    hi guys I asked my dad if you have polluted water and you evaporate it, will it get cleaner and my dad said yes and it is really good that the water evaporates because when it evaporates it rains so it will clean up all the trash cleans the air so I think that is good and I think when you burn salt water it will make salt

  17. Paula
    April 28, 2011 at 7:38 pm

    Water desalination as many of you have said already is removing salt and minerals as well as other unwanted things from the water so it ca be used for drinking and for other things you will use water for in your household (Showering, washing the dishes, laundry, watering your plants flushing the toilet, AC etc.). Though it is also used for the same things in public (shopping malls, temples, etc.) for similar things things or even the same things (flushing the toilet, AC etc.).
    I watched 2 videos. The first one was the one many of you have also watched – http://www.youtube.com/watch?v=gA_XVxhBmTQ but the second one was had 2 different point of views – http://www.youtube.com/watch?v=qZ5ut_4zKug unlike the first which the second video was showing us the negative side of desalination; which is pollution. While the water goes through this process many bad chemicals are put into the air and that affects the marine life and other parts of the habitat and environment, there are different ways to desalinate but every way put’s these chemicals into the air.

  18. Johan
    April 28, 2011 at 8:09 pm

    Desalination means turning salt water into new and fresh drinkable water. The procces is called desalination, and it being used more and more to provide fresh, clean and drinkable water to does who really need it. The main method of dealination is called ” multi stage flash destalition” whic uses heat to evaporate the water living the salt behind.

    I got this information from a youtube video:

    and a webpage:
    http://ga.water.usgs.gov/edu/drinkseawater.html

    • May 1, 2011 at 12:07 pm

      Johan we watched the same video.

  19. April 4, 2013 at 7:47 pm

    Thank you for another informative web site. Where else could I get that type of info written in such a perfect manner? I’ve a project that I’m just now operating on, and I’ve been on the look out for such info.

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