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Dalamar
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Agua

Mensajepor Dalamar » 31 Ene 2013 09:47

Clean water from thin air

The headline statistics of Eole Water’s WMS1000 wind turbine are really rather impressive – in addition to a 30kW power output, the unit can also produce up to around 1,200 litres of high-quality drinking water per day. Using a large humidity condenser and equivalent heat exchanger, the technology actually collects water from the ambient air around the turbine.

It does this, Eole Water’s Thibault Janin explains, using the same process that causes drops to appear on your cold bathroom mirror when you take a hot shower. Only here the ‘mirror’ is one metre wide and five kilometres long.

Aimed at remote areas with a population density of up to 5,000 people, the turbine has been designed to be as self-sufficient as possible. No additional power source is required, whilst maintenance requirements are kept to a minimum through the use of a direct drive generator that doesn’t require a gear box.
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Re: Agua

Mensajepor Dalamar » 17 Feb 2013 09:54

A new study using a pair of NASA satellites has found evidence of rapid depletion of groundwater reserves across parts of Turkey, Syria, Iraq and Iran. The research, which included scientists from the University of California, Irivine; NASA’s Goddard Space Flight Centre and the National Centre for Atmospheric Research, has found that the Tigris and Euphrates river basins lost 144 cubic kilometres of stored freshwater over a seven year period from 2003. This is, the researchers say, almost equivalent to the amount of water in the Dead Sea.

The research was conducted using NASA’s Gravity Recovery and Climate Experiment (GRACE) satellites, which are currently being used to provide a clearer picture of global freshwater storage.

Jay Famiglietti, principal investigator for the study, said: “GRACE data shows an alarming rate of decrease in total water storage in the Tigris and Euphrates river basins, which currently have the second fastest rate of groundwater storage loss on earth, after India. The rate was especially striking after the 2007 drought. Meanwhile, demand for freshwater continues to rise, and the region does not coordinate its water management because of different interpretations of international laws.”

Lead author of the study, Kate Voss, added: “Water management is a complex issue in the Middle East – an area that already is dealing with limited water resources and competing stakeholders.”

Famiglietti concluded: “The Middle East just does not have that much water to begin with, and it’s a part of the world that will be experiencing less rainfall with climate change. Those dry areas are getting dryer. The Middle East and the world’s other arid regions need to manage available water resources as best they can.”
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Re: Agua

Mensajepor Dalamar » 17 Feb 2013 09:55

In many parts of the world, people live in an area of fresh water abundance… and those areas are typically not considered to be in the global geography known as the Middle East.

In the GCC (Gulf Cooperation Council) area, which rings the Arabian Gulf, desalination is in many areas the ONLY source of potable water, as the severe lack of natural potable water mandates.

There are many who see this as an unquestioned need for the region, and others who see the “outbreak” of desalination as a significant problem, albeit a necessary one.

Many variations of desalination outcry can be cited, from numerous sources; this author does actually support the idea that the desalination of sea-water in its current technological state is not sustainable. And if you note the wording closely, that does not mean we should be shutting down the desal plants tomorrow… but tomorrow may bring better alternatives to the current “state of the art”.

The key to new technology is having the “open minds” to realise better methodology for a simple purpose: the extraction of pure water from the sea.

Ongoing efforts regarding this, in the terms of technological advancements to increase performance, lower costs and address environmental issues, are continuing steps which WILL lead to a more, or more truly, sustainable method of producing potable water from the sea.
Improvements are being developed at a rapid pace in regards to both of the most prevalent “types” of desalination technology - in both membrane and thermal technologies.

The “open mind” concept expressed above is also important to review our image of water necessity (or responsibility); do I need to have pure water processed from sea water in order to wash the car, water the garden, flush the loo, or other “needs”?

Do I need to, along with my fellow countrymen, continue to use water at such an alarming rate (in a geographic location where all water is made, not found) that equals or exceeds the usage in countries with abundant natural supply?

Many who decry the issues surrounding sea water desalination do so in line with their understanding of the “facts”, and many do nothing more than condemn the practice and cite immediate change.

For those, please, a message from the desalination industry that we understand the issue and ARE moving towards change… and that such change does not happen overnight.

It should be noted here that from the origins of commercial desalination in the 1950’s, until today, we as an industry have made significant advances in the capital, operational and environmental areas surrounding desalination, and will continue to do so as an industry. We urge others do their best to reduce both use and dependence on such, that we may better concentrate on change and spend less time and funding on continuing the status quo.
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