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The windmill uses reverse-osmosis to produce enough water for 500 people a day. The device also stores 5 days worth of water, and has mechanical safeguards to protect it.  (Source: TU Delft)

The new windmill desalination system is purely mechanical... no electrical components necessary!  (Source: TU Delft)
New high-tech Windmill promises clean, fresh drinking water to many ocean-bordering villages, worldwide

The problematic lack of clean drinking water plagues many impoverished nations worldwide.  Many people do not realize that even nations bordering the sea often suffer water shortages and drink contaminated water.  A new high-tech windmill aims to provide relief for the third-world's water crisis. 

The new windmill can purify salt water purely by wind-driven mechanical energy.  The windmill was designed at the Delft University of Technology (TU Delft) in The Netherlands.  It runs by using the wind's mechanical force to pump water, and utilizes a high tech reverse osmosis membrane.  The pumped water is pushed against this membrane at approximately 60 bar of pressure, and the salt is kept inside while pure water travels across the membrane.

The windmill setup is estimated to 5 to 10 m3 of fresh water a day, based on the device’s capacity at varying wind speeds.  Such output could provide a village of up to 500 people with drinking water.  Water reservoirs will store enough water for five days, in order to avoid water shortages during non-windy days.  The device also has three mechanical safeguards built in to protect it if the installation runs dry, if the installation experiences too low revolutions, or if the installation experiences too high revolutions.  No electrical controls are needed to accomplish these safeguards.

Previous windmill/reverse osmosis setups have been used, but never has the mechanical energy been used to directly fuel the process.  In previous setups, the windmill was used to generate electricity, which was then stored, and used to power a pump driving the reverse osmosis at a much lower efficiency. 

The windmill setup is currently near the A13 motorway outside Delft.  It will be transported to Curaçao for field testing using salt water later this week.  TU Delft hopes to offer similar devices to small villages in dry, isolated coastal areas. 

The fact that the purely mechanical process is superior in terms of efficiency and simplicity to the electro-mechanical system is a reminder that in this modern world of high tech electronics, sometimes the most "high tech" solution is one with no electronics at all.

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RE: Just salt?
By kenji4life on 3/4/2008 4:00:43 PM , Rating: 2
Missed an end quote there..

BTW like I said, wasn't trying to be blunt. Maybe think about it before you say something next time. If you actually have first hand experience going overseas and digging a well and then leaving in rush and saying "don't call", that's your prerogative, or perhaps you lived in a third world country and had people come and dig you a well only to have it dry out, of course I seriously doubt the latter, but even if one of these two scenarios fits you, let it be known that you speak from experience.

Until then your comment just sounds ignorant.

RE: Just salt?
By bety on 3/4/2008 8:11:04 PM , Rating: 2
Actually you're the one who sounds ignorant, or at the very least, that you are having an emotional and illogical reaction.

Emotional, in that you are very angry about a important and relevant issue that was raised.

Illogical, in your assertions that he must be involved in the type of activity before he can comment about them. This, of course, is not rational on many levels. First, most of us(VERY FORTUNATELY) need not participate in an activity before evaluating it critically. Second, the issue of how much of his resources he wishes to invest in such endeavors is not relevant and simply an ad hominem attack.

Further, I'd suggest it is you who should do some research. History is rife with projects which failed because of these issues. In so doing,millions(billions?) have been wasted. Money which could have saved lives. Questions like his, are in fact, the FIRST questions we should be asking when it comes to practical application. Otherwise this is just lab work with no ecological application.

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