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Urine Passes NASA Taste Test
Ponca City, We love you writes "Astronauts flying aboard space shuttle Endeavour are delivering a device to the International Space Station that may leave you wondering if NASA is taking recycling too far. Among the ship's cargo is a water regeneration system that distills, filters, ionizes, and oxidizes wastewater — including urine — into fresh water for drinking or, as one astronaut puts it, 'will make yesterday's coffee into today's coffee.' The US space agency spent $250M for the water recycling equipment but with the space shuttles due to retire in two years, NASA needed to make sure the station crew would have a good supply of fresh water. The Environmental Control and Life Support Systems uses a purification process called vapor compression distillation: urine is boiled until the water in it turns to steam. In space, there's an additional challenge: steam doesn't rise, so the entire distillation system is spun to create artificial gravity to separate the steam from the brine. The water has been thoroughly tested on Earth, including blind taste tests that pitted recycled urine with similarly treated tap water. 'Some people may think it's downright disgusting, but if it's done correctly, you process water that's purer than what you drink here on Earth,' said Endeavour astronaut Heidemarie Stefanyshyn-Piper."
People are too far from their food. If people are upset over urine, what would they think of all of the solid waste that ends up as fertilizer?
Nerd rage is the funniest rage.
The waste water treatment industry has 3 levels of treatment here on Earth. Primary was what was done in the 60's and before (if any treatment). Solids were ground and held to allow bacteria to digest it (the septic tank method) and it was dumped in the river to dilute it for downstream, with a shot of Chlorine. Then secondary treatment came online in the 70's and later, which is what most municipalities do today, where the solids are filtered out by vacuum or pressure filters and burned or buried, but you'd still be able to tell that the chlorine treated effluent was far from potable.
Finally there is tertiary treatment, which yields water so pure you could drink it (disgusting as it might seem), and this is what is implemented at locations such as Lake Tahoe CA. The water flowing out of the waste water treatment is cleaner than that in the lake itself, after the calcium filtration, etc. There are also de-nitrogenation and de-phosphoration processes to "scrub" the effluent of excess Nitrogen and Phosphorus.
How did you think the Mission to Mars was going to supply water to the crew? Certainly could not tanker enough fresh water to make the multi-year trip to Mars AND BACK.
Same here.
Isn't it pretty much the safest source of drinking water? You only need something that can handle things that are already in the bodies of the astronauts. We can safely assume none of them have any nasty viruses in them, and I'm pretty sure we don't have bacteria in our own urine, so you're down to getting the sodium and urea out of it I guess.
This has been debated here in Australia in places where water is very scarce. One issue is with hormones and drugs which get into the urine and can find their way back into the food supply via a recycling system.
Outside inputs to the food chain are heavily regulated on the ISS so I assume this aspect is taken care of.
http://michaelsmith.id.au
You jest, but in some countries like China or Mexico, the excrement-ridden toilet paper isn't flushed. It's simply tossed into the wastebasket. It's one of those foreign things that's hard to take at first sight, much like public sale of dogs for human-food.
:D
I was introduced to the T.P. phenomenon after a Mexican buddy visited my home. I'd been to Mexico many times but I didn't know not to flush because I never took shits there and I was usually so drunk that I never bothered to look in the trash bins. Seeing that ugly brown clump in my wastebasket was enough to ban him from my apartment for a good 2 months before I learned the truth from a few more buddies at home and abroad. Ahh, Western ignorance!