Industrial design students create solar bag that purifies water while person walks

Aug 02, 2012 by Bob Yirka report

(Phys.org) -- It's common knowledge that a lot of people in the world don’t have access to clean drinking water. In some parts of Africa, people, particularly children fall victim to bacteria in the water they drink; a lot of them die. For some, getting to a water source, even one that isn’t clean can mean walking for several miles, and then carrying it back. It’s for these people that industrial design students Ryan Lynch and Marcus Triest have designed and created what they call the Solar Bag, it’s a bag that holds water and hangs off the shoulders and lies on a person’s back and uses UV radiation from the sun to kill bacteria in the water while the person is walking or after they have arrived at their destination.

Using UV rays to kill bacteria in is nothing new, there are many gadgets that do so, though many require electricity to help the process and virtually all of them are centered around treating the water once it has arrived. Lynch and Triest saw that as inefficient and cruel. Why make seriously thirsty people sit around for hours waiting for their water to become safe to drink when the process could have been started right after filling the container that was brought back?

To create their bag, they turned to a method of water purification known as SODIS, where PET (made of polyethylene terephthalate - the type of plastic used for soft drinks) bottles filled with water are exposed to sunlight for up to six hours, allowing UV radiation to kill most of the bacteria in it. Instead of bottles they created a two sided bag. On the outer side, the one that faces the sun when a person walks, is clear plastic that allows the UV rays to enter. On the inner side is black plastic that absorbs heat, helping the UV rays do their job. The bag is then connected to straps that allow the water to be carried like books in a common backpack. The bag can be hung on a wall as well, for continued treatment after the person carrying it arrives at their destination. It also has a tap at the bottom to let the water out and a squeeze balloon with filter for additional purification.

The two say that their Solar Bag can purify two and a half gallons of water in six hours, the same amount of time it typically takes other systems to treat much less water. Unfortunately, the bags aren’t yet being commercially produced; the two are currently looking for a backer. They say that the material costs for one Solar Bag amount to just $5, and possibly less if manufactured in bulk.

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More information: www.byrye.com/solar-bag.html

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extremity
Aug 02, 2012
This comment has been removed by a moderator.
jimsworldsandiego
not rated yet Aug 02, 2012
Then poison the people drinking the water?

Environ Health Perspect. 2010 April; 118(4): 445448.
Published online 2009 November 25. doi: 10.1289/ehp.0901253
PMCID: PMC2854718

Polyethylene Terephthalate May Yield Endocrine Disruptors
http://www.ncbi.n...mcentrez
jimsworldsandiego
not rated yet Aug 02, 2012
And 2011 study:
Abstract
Plastic, one of the most preferred materials in today's industrial world is posing serious threat to environment and consumer's health in many direct and indirect ways. Exposure to harmful chemicals during manufacturing, leaching in the stored food items while using plastic packages or chewing of plastic teethers and toys by children are linked with severe adverse health outcomes such as cancers, birth defects, impaired immunity, endocrine disruption, developmental and reproductive effects etc. Promotion of plastics substitutes and safe disposal of plastic waste requires urgent and definitive action to take care of this potential health hazard in future.

http://www.ncbi.n...3299092/
antialias_physorg
not rated yet Aug 03, 2012
You have to keep thnigs in perspective, here.

Millions of children die of diarhea each year due to unsafe water. The number of people who have health problems due to exposure to plastics pale into insignificance (and anyhow - these problems come later in life.)

What good is it to enact protection of the teeth of children by taking these purification bags away if the child does not survive to the age of even having teeth because you took the purification bag away?

A "potential health hazard" in the future is meaningless if you don't see that future.

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