How to Pasteurize Water with a Plastic Bottle
From Howtopedia - english
- Problem: Fighting diarrhea and water transmitted diseases
- Idea: Using the combined action of UVA radiations and of pasteurization temperature buy putting rather clear water in a transparent bottle in the sun for a day.
- Difficulty: Only for small amounts. Doesn't treat chemical polution. Doesn't change the colour, the odor or the taste of the water. Clean storage and quick use once opened.
- Material Needed: Transparent plastic bottles with their cap. (black paint)
- Geographic Area: Sunny areas best.
- How Many people? One person
- How Long does it take? 20 min the first time + laying in the sun time ( between 6 hours and 2 days)
SODIS is cheap and practical water treatment method which uses solar energy to improve the microbiological water quality. It is used at household level to treat small quantities fo drinking water. SODIS was developed by the EAWAG Institute in Switzerland and is promoted by SANDEC. SODIS is ideal to treat small quantities of water. Contaminated water is filled into transparent plastic bottles and exposed to full sunlight for six hours. The water has to be relatively transparent ( low turbidity). If it is not the case, you should filter the water first till it is possible to read the Sodis Logo through the bottle. .
To pre-filter the water, see for exemple How to Lower Water Turbidity with a Roughing Filter
Fill the bottle 3/4 and shake it to let more oxygen dissolve in the water. This ameliorates the UV action. Then fill the bottle completely and lay it in the sun. Best is if you can lay it on a dark surface orientated to the sun, or even paint half of the bottle black, and present the transparent part to the sun.
Only for small amounts. Doesn't treat chemical polution. Doesn't change the colour, the odor or the taste of the water. Clean storage and quick use once opened.
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