Delft Salt

18 Feb, 2007 in art pottery by admin

Delft Salt

Salty Water In...fresh Water Out

In many poor, third world countries, even having the resources to obtain electricity presents a problem. Due to the lack of logistics, as well as the finances even if all of the logistics were in place, alternate methods are necessary in order

to have the basics that those in more financially fortunate areas of the world have.

A recent development at Delft University of Technology (TU Delft) in the Netherlands is a basic windmill that operates a pump, in turn utilizing reverse osmosis to output fresh water from the salty seawater that is put in. Reverse osmosis is a process used to purify concentrated solutions (often water with high levels of dissolved salts) in which pressure is applied to the more concentrated (or contaminated) solution on one side of a semipermeable membrane. The result is the movement of solvent, but not solutes, from the more concentrated side to the more dilute side, thus separating clean solvent from the concentrated solution.

So, basically, in laymens terms, reverse osmosis purifies the salt filled sea water so that it is able to be used for drinking water. This development by Delft University is a critical advancement for small villages located in arid areas near the coast.

Using windmills for desalination is nothing new. These contraptions have previously been utilized and have been marketed already. The windmills on the market currently use wind to produce electricity, and then store that electricity in order to begin the process of reverse osmosis. Due to the expensive nature of this, as well as the fact that energy depletes during the procedure, TU Delft contrived a method that is a bit different. Their technique is more energy and economically efficient.

Their method, unlike the others, runs directly on wind power. The middle step of storing the electricity has been completely eradicated from the equation. By storing water (which is more cost-effective than the electricity storage), calm periods, when there is no wind, are not as dire of an issue.

The windmills that are in use for this process are slow-moving and strong. The estimations that have been done up to this point on the windmills in question gauge them to be able to provide drinking water for a small village of around five hundred people. This is not per week, or per month. These estimates are on a per day basis through the reverse osmosis process of one windmill. University of Delft is aware that an emergency supply needs to be in place to consume during the inevitable calm periods when the windmill is not able to use the wind power to operate the reverse osmosis procedure.

The first test run for this new development is set for the beginning of March, in which the windmill that has been operating near Delft will be dismantled and relocated to Curacao. The prospects of this succeeding will be monumental for villagers who lack fresh irrigation and who have to employ manual techniques to obtain any semblance of drinkable water. The economical aspect, along with the quicker, machine-operated abilities villagers will now have to acquire such a basic need, will surely have colossal effects on poorer, third world countries.

About the Author

David Tanguay is dedicated to providing research, reviews & helpful information to consumers and businesses. For more information related to Green Energy and Alternative Energy please visit http://greenenergyonline.org

What is the meaning behind Liz Lochhead's poem Storyteller?

Storyteller

she sat down
at the scoured table
in the swept kitchen
beside the dresser with its cracked delft.
And every last crumb of daylight was salted away.

No one could say the stories were useless
for as the tongue clacked
five or forty fingers stitched
corn was grated from the husk
patchwork was pieced
or the darning done.

Never the one to slander her shiftless.
Daily sloven or spotless no matter whether
dishwater or tasty was her soup.
To tell the stories was her work.
It was like spinning,
gathering thin air to the singlest strongest
thread. Night in
she’d have us waiting, held
breath, for the ending we knew by heart.

And at first light
as the women stirred themselves to build the fire
as the peasant’s feet felt for clogs
as thin grey washed over flat fields
the stories dissolved in the whorl of the ear
but they
hung themselves upside down
in the sleeping heads of the children
till they flew again
in the storytellers night.

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