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Yale Researchers Develop Forward Osmosis

Water and discount drug viagra energy go hand in hand. We use tons of water in the process of producing energy, and we often expend lots of energy in the process of cleaning our water and making it drinkable. So when we’re talking about developments in desalination and water purification technologies, the key is we recommend discount levitra levitra not just finding ways to better purify water, but to do levitra in spain it with a low cost of energy.

A group of researchers from Yale have developed a system that utilizes a technology they call forward osmosis, not to be confused with its counterpart, reverse osmosis. We all learned at some point in our educational careers that dilute water will flow into solutions that are more concentrated with salt (or, technically, any other solute). However, it is possible to reverse that process by pushing the water really hard against a membrane that will only let water molecules through. That is reverse osmosis – it gets the job done, but you need to push really hard (energy) and the good choice cheap canadian cialis flow rate is so slow that you get barely a trickle.

In forward osmosis, the salty water is once again placed in front of a membrane that is only permeable to cheap tramadol buy online water molecules. This time, though, an even more concentrated solution is placed on the other side of the membrane. This secondary “draw” solution - a proprietary mix of ammonia and carbon dioxide – draws the water molecules from the salty water through the membrane.

The draw solution is designed in such a way that it can be easily removed from the water, thus leaving clean water behind as the finished product. The key, though, is that by tapping the link for you viagra without prescriptions natural osmotic forces between the salty water and the draw solution, the purification system as a whole uses only about a tenth of the energy of a comparable reverse osmosis system.

The downside is that, although the system is elegant and efficient, it might not be feasible to scale it up as large as commercial desalination plants. But we will keep our eye on Oasys, the startup which has been spawned in the course of developing this technology.

For a good overview of different desalination systems complete with the pro's and con's of each, click here.

Via Cleantechnica
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Comments (4)Add Comment
written by Adam, February 03, 2009
Very interesting article, big implications. How could this process use 1/10th of the energy and not be feasible on a large scale? If it is economical on a small scale you can always modulate to create a large scale. Is there an expensive concentrate in this process that can't be reused? That is the only other reason that I can think it may not be feasible on a large scale. Other than that, energy equals expensive.

Anyway, ingenious idea, one of those, yeah, that makes sense, why hadn't we thought of that until now?
written by Dave, February 03, 2009
The reason we hadn't thought of it until now... is that we actually thought of it several years ago.

This article implies that this process is a new breakthrough, but it's something I researched as an undergraduate two years ago. It's been around since at least the 70's.

Maybe the start-up company is new, but the tech isn't.
written by, February 03, 2009
The tech is maybe not as new as the article implies. But its effective application is somewhat novel. Let's hope they succeed to scale up the tablets viagra process and market it asap!

The developing world would have great use of a cheap process for purification/desalinization of water.
written by Dave, February 03, 2009
The topic of forward osmosis is very interesting, but the article doesn't do a good job of reporting what the Yale researchers did or why it was important.

They didn't invent FO. They just engineered a new-ish method of doing it which uses CO2 and ammonia gas as the removable solute. This is important because CO2 and ammonia can be removed from water simply by heating it to about 60C. In other words, waste heat from a power plant can take care of most of it's cool cheapest prices on levitra the energy for the FO process.

That's what's new and we like it generic levitra mastercard interesting. With a few minutes of research on Wikipedia the author could have learned that. I really enjoy EcoGeek, but they dropped the ball here.

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