Tue Sep 13th, 2011 at 11:28:32 PM EST
Solar water disinfection
A two liter plastic bottle can be made into a water treatment system simply by filling it with contaminated water and exposing it to the sun. Sodis is an organization that promotes this technology around the world.
The disinfection process can be speeded by turning aluminized mylar snack food bags inside out and making them into reflectors as two young students in Belo Horizonte, Brazil discovered: http://calais.phase2technology.com/content/isef-sterilizing-water-with-trash
Solar bottle bulbs for daylighting
In 2002, during a long electrical shortage, at Uberaba, São Paulo, Brasil, Mr Alfredo Moser discovered a way to gather sun light in the house through plastic bottles hanging from the roof. First shown at the Globo Reporter in the 25th May 2007.
Alfredo Moser was pressed by a scarce electricity substitution and found out that he could light his house with a bottle of water filled with water and a protection cap made of camera film.
The bottle is just refracting sunlight very effectively and produces an equivalent light power compared to a 50/60W lamp. In a rainy day, even without much light and direct sun, one still have some light. Scientist have now visited Moser and are looking into ways to take this concept to maximize its potential.
That was 2002. Now over 10,000 households, small businesses, and schools in the Philippines have installed solar bottle bulbs. Iliac Diaz of Liter of Light is attempting to spread it worldwide.
The invention is something that is so simple, cheap, and sustainable that anyone can create and maintain it themselves.
As Diaz says, the three rules of appropriate technology are that people can find it, they can replicate it, and most importantly, they can make a business of it.
Here's another Brazilian design, for a PET bottle hot water heater
There are also plastic bottle houses
In Nigeria, they fill the bottles with sand or dirt to make bottle bricks.
Here's a backpacker solar water heater
A recycled solar cloche or cold frame for the garden
All these devices make use of the Simple Solar Principles
Dark gets hot
Clear keeps the wind out
Most any and everybody can understand how to build and use them.
Even when a plastic bottle is chopped up, it may still help in purifying water
"Plastic bottle" solution for arsenic-contaminated water threatening 100 million people
Note to journalists: Please report that this research was presented at a meeting of the American Chemical Society.
DENVER, Aug. 31, 2011
"Dealing with arsenic contamination of drinking water in the developing world requires simple technology based on locally available materials," said study leader Tsanangurayi Tongesayi, Ph.D., professor of analytical and environmental chemistry at Monmouth University, West Long Branch, N.J. "Our process uses pieces of plastic water, soda pop and other beverage bottles. Coat the pieces with cysteine -- that's an amino acid found in dietary supplements and foods -- and stir the plastic in arsenic-contaminated water. This works like a magnet. The cysteine binds up the arsenic. Remove the plastic and you have drinkable water."
Water bottles walls, hanging bottles in south-facing windows in south-facing windows, is folk technology that goes back at least to the 19th century. Always wanted to set up a stacked thermosyphon from one gallon to five gallon container to another to see how that would affect the system. Has anyone combined solar water disinfection with solar daylighting? How about water collection and treatment with solar daylighting, water and space heating, plus PV power as one integrated system.
Trash Technology for Education and Survival
Fastfood Containers as Solar Devices
Solar Is Civil Defense
Small-scale LED Lighting, Off-Grid Cell Phones
All I know about simple solar is at
crossposted to http://solarray.blogspot.com/2011/09/trash-technology-and-recycled-solar.html