How Clean Can UV?

“UV radiation affects microorganisms by altering the DNA in the cells and impeding reproduction. UV treatment does not remove organisms from the water, it merely inactivates them.” – Water Research Center

For the longest time this summer I worked on a machine that performed persulfate-ultraviolet oxidation, but I really had no idea what it was. Looking at the machine, I could see that an oxygen tank and a beaker of persulfate solution were combining with my water samples and traveling through various tiny twisted tubes into a swirl of madness that then shot out in all directions and ended up in a scramble of numbers on the computer screen. So I asked around. Ten weeks of “asking around” later, and still all I knew was that somehow the glowing blue light was breaking down the carbon in my water samples and measuring its concentration.

On the left, persulfate-ultraviolet oxidation. Right, SteriPEN technology.

Continue reading “How Clean Can UV?”

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Energizing a Continent

Off-grid provides lighting for families using a subscription service.
Off-grid provides lighting for families through a solar panel subscription service.

In my last post I mentioned non-profit and for-profit business ventures around the world with a mission to improve society and the environment. It would be naïve to say that the driving force in business is to benefit others. So what is driving entrepreneurs to Africa? An article recently featured in The New Yorker called “The Race to Solar-Power Africa” says it all. Continue reading “Energizing a Continent”