From what I gather it looks like the machine takes contaminated water and separates it into potable water and stuff that can be used as fertilizer. Interesting concept! There is also a video of Gates drinking water that was previously contaminated.
Quote:
I watched the piles of feces go up the conveyer belt and drop into a large bin. They made their way through the machine, getting boiled and treated. A few minutes later I took a long taste of the end result: a glass of delicious drinking water
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http://www.wired.com/2015/01/omniprocessor/