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jmiller
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Re: In search of fresh water
jmiller   10/30/2012 9:28:05 PM
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I like articles like this that show opportunities for engineers to come through with a way to improve life in a significant way, not just make a better mouse trap.

Ann R. Thryft
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Blogger
Re: In search of fresh water
Ann R. Thryft   10/30/2012 11:51:00 AM
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Nadine, I agree about graywater usage. I live in a hotbed of it here in Santa Cruz county. If it wasn't for the expense, we would have installed one a long time ago on our own property. I still plan to, but it's still behind other homeowner fixup priorities. That's a big part of the problem in leaving it up to the private sector, i.e., homeowners. I wish there were incentives like tax deductions, such as there have been for solar.

Ann R. Thryft
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Blogger
Re: Pipe Cleaning
Ann R. Thryft   10/29/2012 5:46:28 PM
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Thanks, Jack. The surface material must be both sticky and slippery, so the chemical- and salt-laden seawater stays on only long enough to evaporate completely and efficiently, but no longer. Ideally, it also must shed deposits relatively easily. There's no continual cleaning here: regular maintenance is required, as with metal, but lower process temperatures allowed by the material will help residues build up more slowly.

NadineJ
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Platinum
Re: In search of fresh water
NadineJ   10/29/2012 5:25:21 PM
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There are very strict restrictions on grey water usage here in California.  Regulations loosened up a little a few years ago.  Many people in the Bay Area promote grey water usage, and sell how-to kits and books.  Technically, some of the movement is breaking the law but it's moving the debate in a positve direction.

My POV is based in research and observation.  Desalinization seems like a good idea but only offers short term relief.

Ann R. Thryft
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Blogger
Re: Sea water purification
Ann R. Thryft   10/29/2012 11:51:49 AM
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Mydesign, that's a distillation process you describe, so it sounds like the majority form of desalination, the one I cover here. I'd be interested to know more about what exact processes are being used and what challenges, obstacles, problems, etc. the Arab countries have encountered. I'm also very curious about reverse osmosis, the much less often used method, and wonder why it isn't used more often.



Ann R. Thryft
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Blogger
Re: Desalination
Ann R. Thryft   10/29/2012 11:50:28 AM
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William, I think that's an excellent point: some areas are simply not inhabitable by a certain number of people after a specific threshold has been passed, without either importing huge amounts of water, such as in Los Angeles, or without needing a huge, expensive, artificial infrastructure of some kind. We have come to think such an infrastructure is the norm, but it's quite recent in human history. And thanks for quoting Bob Dylan :)

Ann R. Thryft
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Blogger
Re: In search of fresh water
Ann R. Thryft   10/29/2012 11:49:53 AM
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Thanks, Nadine. Your POV is held by many here, regarding using other options such as graywater conversion and conservation. The problem with conservation in Santa Cruz County is that we've done just about as much as we can, short of graywater conversion both public and private: our water usage rates here are very low already compared to other areas of the US. And why we haven't done graywater conversion more on a public scale, I don't know--it seems so obvious.

Jack Rupert, PE
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Platinum
Pipe Cleaning
Jack Rupert, PE   10/29/2012 10:46:11 AM
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Very interesting article, Ann.  Living in the Midwest on the shores of one of the largest bodies of fresh water in the world, I didn't have a lot of background in how desalination is accomplished.  Using the method you described, I would assume that they materials being used would have to be rather "slippery" too.  If you are spraying salt water on them specifically to cause steam and leave the salt and contaiminate behind, I would think that the pipes would be covered in a relatively short period of time...either that or there is a good method for continual cleaning.

Mydesign
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Re: In search of fresh water
Mydesign   10/29/2012 2:00:47 AM
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Beth, we know that eventhough 2/3rd of earth is covered by water, most part of the world still have scarcity of drinking/fresh water. So the best option to bridge the gap is purification or desalination of sea water. Most of such projects required huge investment and complex technology/machinery for purifying the salt water. A new more economical and simple technology has yet to be discovered and I think these new technology may comes under that category.

Mydesign
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Sea water purification
Mydesign   10/29/2012 1:23:42 AM
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Ann, I know in most of the Arab countries, they are distilling the sea water for residential purpose other than drinking. Am not sure about the technology they are using for this purification, but I heard that it's a multi stage purification, where water is evaporating to remove the salt content. In such cases I think the new technology seems to be superior and affordable.

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