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Solar Water Disinfection and Sterilization

Cancer
by Cancer
Views: 3,941
All pages by Cancer
Page last updated: Jun 23 2011
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Solar water disinfection (also referred to as SODIS) is a method of disinfecting and sterilizing water using only direct sunlight and plastic PET bottles. SODIS is an effective method of decentralized water treatment, usually conducted at the household level. It is recommended by the World Health Organization as a viable method for household water treatment and safe storage.

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In addition to use in developing nations where clean drinking water is hard to come by, SODIS can be used in survival situations. On average 6 hours of direct sunlight is needed to effectively sterilize water.


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Sunlight exposure has been shown to deactivate diarrhea-causing microorganisms in polluted drinking water. The benefits of solar radiation include:

  • UV-A interferes directly with the metabolism and destroys cell structures of bacteria.

  • UV-A (wavelength 320-400 nm) reacts with oxygen dissolved in the water and produces highly reactive forms of oxygen (oxygen free radicals and hydrogen peroxides), that are believed to also damage pathogens.

  • Cumulative solar energy (including the infrared radiation component) heats the water. If the water temperatures rises above 50°C, the disinfection process is three times faster.

    At a water temperature of about 30°C (86°F), about 5 hours of exposure is required for SODIS to be efficient. As water temperatures rise above 45°C (113°F), the synergistic effects of UV radiation and temperature further enhance the disinfection process.

    At lower temperatures or during periods of over cast weather, 2-3 days may be required to properly disinfect water.

    If the water is highly turbid (contains particles that are not dilluted), it should be filtered before SODIS is used. In a survival situation, filtration could be done through a t-shirt or other material.



  • All pages by Cancer
    Page last updated: Jun 23 2011



    COMMENTS

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    NocturnalMistress
    NocturnalMistress
    06:37 Jun 23 2011

    That's awesome. Purifying water using direct sunligh is a convenient way for third world countries to receive and get clean water.





    Lerajie
    Lerajie
    06:41 Jun 23 2011

    very interesting.





    MasterMel2
    MasterMel2
    07:05 Jun 23 2011

    Fantastic and efficient





    Otium
    Otium
    07:12 Jun 23 2011

    Greatly informative





    skyrah
    skyrah
    08:44 Jun 23 2011

    great information.





    xRobin3x
    xRobin3x
    10:01 Jun 23 2011

    Always up to learn the different ways to clean water.





    VB
    VB
    13:02 Jun 23 2011

    Very good information. Thank you.





    Sulks
    Sulks
    13:55 Jun 23 2011

    Interesting to see that sunlight, which in Third World countries can cause severe food shortages, can actually be beneficial in some ways. Great info.





    xTIAMATx
    xTIAMATx
    14:31 Jun 23 2011

    Very Interesting





    monk
    monk
    14:35 Jun 23 2011

    Wow, Suns ray has lots of energy hmmmm.





    imagesinwords
    imagesinwords
    15:51 Jun 23 2011

    Outstanding information to share.





    Aja
    Aja
    17:52 Jun 23 2011

    Interesting.





    LustsIncarnate22
    LustsIncarnate22
    18:50 Jun 23 2011

    very cool :)





    xdark666angelx
    xdark666angelx
    20:38 Jun 23 2011

    you would think that the water would evaporate but it doesnt





    Cancer
    Cancer
    21:27 Jun 23 2011

    It would if you didn't put the cap on.





    Bones
    Bones
    22:24 Jun 23 2011

    This actually works well. It can also be accomplished with a zip lock bag, which is a good item to have in a survival kit, since it can be stored more compactly.





    MOONLITDREAM
    MOONLITDREAM
    00:04 Jun 24 2011

    Interesting read





    Eloquent
    Eloquent
    04:15 Jun 24 2011

    That's amazing. o.O





    Morrigon
    Morrigon
    16:43 Jul 09 2011





    Morrigon
    Morrigon
    16:43 Jul 09 2011

    Son of a bitch. Images should be allowed as comments.





    NataviaLeigh
    NataviaLeigh
    14:20 Aug 25 2011

    Awesome info ty :}}}






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