HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
<<  <  Page 3/3
William K.
User Rank
Platinum
Desalination
William K.   10/28/2012 7:43:08 PM
It would seem that removing the salt and other minerals froom seawater would be the preferred method, not only because of the magnesium recovered, but because sea water is an easy to get resource that we won't be in any danger of running out of. If the berries are different after a few years it is probably because of cost being taken out of the growing process, not because of the water. What quality reduction has been implemented to increase profits?

Of course desalination does need a lot of energy, I don't know any way around that, one other option is for people to not live in that area that has no water. Did anybody ever stop and consider that some places that seem uninhabitable ARE UNINHABITABLE? Even if some developer puts houses there?

REmember the Bob Dylan quote: "One should never be where one does not belong"? It is also appropriate for areas without water. 

The problem is that while we can make potable water out of seawater, we can't make the energy to do the process.

NadineJ
User Rank
Platinum
Re: In search of fresh water
NadineJ   10/26/2012 12:55:22 PM
NO RATINGS
Desalinization isn't a good long term solution.  It's been used in Israel for years for crop irrigation.  The strawberries in Israel today aren't nearly as delicious or nutritious as they were decades ago.  I think the berries are telling us something.  Legalizing and building infrastructure to utilize grey water would offer a longer solution for potable water shortages.

This may be easily used for manufacturing and energy creation.  Many newer processes seem to involve massive amounts of fresh water.

Nicely written.  Very informative.

Tim
User Rank
Platinum
Plastic Material
Tim   10/25/2012 7:17:44 PM
NO RATINGS
It would be interesting to know the base resin used to add the copper fibers.  The 50% letdown of copper is pretty significant.  Good article.

Ann R. Thryft
User Rank
Blogger
Re: In search of fresh water
Ann R. Thryft   10/25/2012 12:55:53 PM
NO RATINGS
Reverse osmosis and other membrane technologies are the methods I'm more familiar with and have heard mentioned more often, so I was surprised to discover that thermal distillation is the technology used in the majority of installations. Although RO presumably uses somewhat less energy, both processes are quite intensive energy users. Re temperatures, thermal distillation is a form of vacuum distillation, which allows water to boil at a lower than normal temperature due to lower pressure. The Wikipedia article on desal is helpful.

Ann R. Thryft
User Rank
Blogger
Re: In search of fresh water
Ann R. Thryft   10/25/2012 12:48:26 PM
NO RATINGS
I've been watching the desal controversy for several years as it's been debated locally. Although it's not the only one, infrastructure cost is definitely one of the problems that must be overcome.

bob from maine
User Rank
Platinum
Re: In search of fresh water
bob from maine   10/25/2012 11:13:23 AM
NO RATINGS
When reading of flash-tube boilers I envisioned tubes heated to several hundred or more degrees, not 70-130. The concept of having water spray and evaporated steam in close proximity without excessive mixing is interesting. I wonder if flash-tube could be economically superior to Reverse Osmosis? Certainly the next 30 or so years will see the need for many more water purification methods.

Beth Stackpole
User Rank
Blogger
In search of fresh water
Beth Stackpole   10/25/2012 7:22:48 AM
NO RATINGS
Very interesting development, Ann. Providing a more economical way to attack the desalination process could really make a big difference in pushing more of these projects to the fore and help them gain a foothold in developing areas that are really desparate for fresh water sources.

<<  <  Page 3/3


Partner Zone
Latest Analysis
Tesla Motors Inc. took another big step into the battery market last night, officially unveiling a strategy that would enable it to sell batteries into home and grid storage applications.
At some point in the distant future, we may all be driving electric cars. Until then, however, the debate over their ongoing viability rages on.
Machine vision and video streaming systems are used for a variety of purposes, and each has applications for which it is best suited. This denotes that there are differences between them, and these differences can be categorized as the type of lenses used, the resolution of imaging elements, and the underlying software used to interpret the data.
Comic books long have appealed to kids as a fun way to introduce reading and art without being overly didactic. Now a software engineer and project manager from Oklahoma thinks the medium can be used to get them interested in STEM careers.
Sherlock Ohms highlights stories told by engineers who have used their deductive reasoning and technical prowess to troubleshoot and solve the most perplexing engineering mysteries.
More:Blogs|News
Design News Webinar Series
3/31/2015 11:00 a.m. California / 2:00 p.m. New York
2/25/2015 11:00 a.m. California / 2:00 p.m. New York
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
5/7/2015 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
May 4 - 8, Designing Low Power Systems using Battery and Energy Harvesting Energy Sources
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Last Archived Class
Sponsored by Proto Labs
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service