| Index | Recent Threads | Unanswered Threads | Who's Active | Guidelines | Search |
 |
World Community Grid Forums
Category: Completed Research
Forum: Computing for Clean Water Forum
Thread: Interesting news about Computing For Clean Water |
| No member browsing this thread |
|
Thread Status: Active Total posts in this thread: 29
|
|
| Author |
|
|
Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Carbon is great if used or left in the right place and not mixed up with other atoms... saw a Norit plant in Ravenna [150 km south of Venice] where they make these tablets to take [not too many] if your bowel contents are on the run ;>),
From USA Today, environment section: Carbon-coated sand improves purification of drinking water Scientists have figured out a way to convert regular sand, an agent used frequently in water purification, into "super sand" with a greater filtering capacity. Researchers coated sand granules with a carbon material, very similar to charcoal, known as Graphite Oxide (GO). Their findings, as reported in the American Chemical Society's Applied Materials and Interfaces, noted that the GO-coated sand was able to absorb concentrations of dissolved mercury, a lethal toxin, and organic dye five times as often as pure sand. ... "Five times as often" reads strange, as if the sand is reused. That Mercury is lethal... well duh. Think the gold diggers in Brazil know all about that and what it's doing to health and environment. --//-- |
||
|
|
littlepeaks
Veteran Cruncher USA Joined: Apr 28, 2007 Post Count: 748 Status: Offline Project Badges: 
|
This week's edition (July 25, 2011) of Chemical & Engineering News has a very interesting article entitled "Why Water Fills Nanotubes". Unfortunately, it is only available to American Chemical Society and institutions with a subscription.
----------------------------------------Some interesting tidbits from this article are: 1. Water (unexpectedly) spontaneously enters carbon nanotubes (CNTs). 2. For tubes smaller than 1.1 nm, the phase of water is gaslike. 3. For tubes larger than 1.2 nm, the water is more like a liquid. 4. For tubes between 1.1 and 1.2 nm, the water is icelike, but is described in the article as a "highly diffusing solid." The key to this behavior is the water inside CNTs is more disordered and has higher entropy. Another interesting fact is that CNTs greater than 1.5 nm spontaneously empty water below 240K. I recommend that anyone doing research in this area obtain a copy of the article. [Edit 1 times, last edit by littlepeaks at Jul 29, 2011 9:45:49 PM] |
||
|
|
l_mckeon
Senior Cruncher Joined: Oct 20, 2007 Post Count: 439 Status: Offline Project Badges: 
|
"Another interesting fact is that CNTs greater than 1.5 nm spontaneously empty water below 240K."
I'm not sure I understand that. Do you mean the CNTs act as a siphon? |
||
|
|
littlepeaks
Veteran Cruncher USA Joined: Apr 28, 2007 Post Count: 748 Status: Offline Project Badges:
|
"Another interesting fact is that CNTs greater than 1.5 nm spontaneously empty water below 240K." I'm not sure I understand that. Do you mean the CNTs act as a siphon? The article states that the reasons for this are not understood. CNTs are made of graphene sheets, which are hydrophobic. That means, that under normal conditions, they would repel water (like water on wax paper). Evidently the chemistry changes at this temperature. No matter how complicated it is to us, the molecules know exactly what they're doing and don't get confused.  [Edit 2 times, last edit by littlepeaks at Jul 30, 2011 5:30:16 AM] |
||
|
|
Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
240K(elvin) is minus 33C... not much water flows then ... super sublimation maybe... triple point shift ;?
--//-- |
||
|
|
Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
New technology uses solar UV to disinfect drinking water
Simple, cheap and effective, just what folks otherwise being made sick by contaminated water in third world countries need. But more effective filters will also still be needed and helpful, so keep on crunching.  http://www.physorg.com/news/2011-09-technology-solar-uv-disinfect.html |
||
|
|
Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Green Discovery Uses Waste Glass to Clean Up Water
http://www.sciencedaily.com/releases/2011/10/...3A+Latest+Science+News%29 |
||
|
|
Coleslaw
Veteran Cruncher USA Joined: Mar 29, 2007 Post Count: 1343 Status: Offline Project Badges: 
|
Old news, but was new to me when reading Wired Magazine was the potential use of banana peels.
----------------------------------------http://www.wired.com/magazine/2011/09/st_3st_banana/ http://www.sciencedaily.com/releases/2011/03/110309113030.htm     |
||
|
|
Somervillejudson@netscape.net
Veteran Cruncher USA Joined: May 16, 2008 Post Count: 1065 Status: Offline Project Badges: 
|
Read wan article recently how the Thames river in London had such a high concentration of antidepressants that it was negatively effecting the aquatic live and was not being filtered out by the curent public filtering system. Currently they are "fracking" the underground oil formations, to release the gas and oil locked up, in nonporous strata. Apparently some are using a billion gallons of water.
|
||
|
|
Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Ionized Plasmas as Cheap Water Sterilizers for Developing World
While they won't filter out all impurities, University of California, Berkeley, scientists have shown that ionized plasmas like those in neon lights and plasma TVs not only can sterilize water, but make it antimicrobial -- able to kill bacteria -- for as long as a week after treatment. That's according to this report on the website Science Daily: http://www.sciencedaily.com/releases/2011/11/111115180309.htm |
||
|
|
|