14-year-old invents a solar-powered water purification jug

2:11 p.m. on December 18, 2012 (EST)
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2:42 p.m. on December 18, 2012 (EST)
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so....she's apparently found a way to accelerate SODIS?

Not to mess with the forward march of science, but I think that SODIS kills a broad spectrum of bacteria in 6 hours.  Fill a clear PET plastic bottle with relatively clear water, let it sit in the sun for 6 hours, and all kinds of bacteria that cause GI distress, plus many viruses, are rendered unable to reproduce.   It is a well-established way to purify water.

http://www.sodis.ch/methode/index_EN

If the student ran her tests at 3 hour intervals and still found bacteria more than 6 hours in, i'm wondering whether there may be some experimental contamination.  Alternatively, I'm wondering whether inserting a hollow rod actually slowed the process of UV rays killing bacteria, allowing some bacteria (in the water WITHIN the hollow rod) to escape the effect of UV light.

 

Hm.....

October 20, 2014
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