Tribute to Sodis for water disinfection

Solar water disinfection (SODIS) has been around for quite some time now and with approx. over 340.000 users in Africa alone, this low budget water disinfection “technology” is a smart approach.

In areas where piped drinking water just isn’t available or of questionable quality, solar water disinfection is a cheap and effective method for decentralized water treatment as it can be applied at household level.

It is a simple method that’s easy to teach and is designed for small scale production.

SODIS uses solar radiation to destroy pathogenic microorganisms which cause water borne diseases: Sunlight is treating the contaminated water through two synergetic mechanisms: Radiation in the spectrum of UV-A (wavelength 320-400nm) and increased water temperature. If the water temperature raises above 50°C, the disinfection process is three times faster. (source)

The World Health Organization (WHO) even recommends SODIS as a viable method for household water treatment and safe storage.

All you will need are clean & transparent PET bottles, ?ll them up with water and expose them to direct sunlight for at least 6 hours.

Many people also put them on a corrugated roof (to increase temperature) and saturate the oxygen content inside the bottles prior to the sun treatment by ?lling them up three quarters, shaking them for 20 seconds with a closed cap on and then ?ll them up completely.



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