Nanotech and \'tea bag\' to clean up drinking water
The lack of clean water remains a problem for millions of people around the world, but new developments in nanotechnology and water filters similar to crude tea bags may be effective solutions.
The \"Teabag\" filter is the brain-
A child taught at the University of steenbosch.
It is designed to fit the neck of a standard-sized water bottle, which means that it is interchanged and that the cost per liter is between 1 and 5 cents depending on the filtered water quality.
\"The easiest way to imagine our filter is to imagine an ordinary tea bag,\" Cloete said . \".
\"The outside of the bag is coated with polymer, including a biokiller, which means it can filter both water and kill bacteria ---
We haven\'t found any bacteria that it can\'t kill yet.
\"When inside ---
Tea if you like-
Made of activated carbon, chemical pollutants can be removed.
\"It\'s easy to remember: one bag and one liter.
According to Cloete, the bag is disposable and completely biodegradable, and the activated carbon inside is a good soil conditioner.
\"All technologies have their limitations,\" Cloete said . \"
\"I will not drink sewage through it.
But if you drink badly polluted water-
1 million bacteria per ml-
It will reduce it to less than ten;
You just can\'t find them after filtering.
\"Professor Cloete is currently working with machine manufacturers in the Czech Republic, hoping to have a large-scale
Listed before February 2011.
He said he had been \"overwhelmed\" by requests from NGOs to distribute tea bags around the world.
According to the United Nations World Health Organization, the lack of clean water and sanitation has killed one person.
There are 6 million children each year.
Nega bazew Legesse of Oxfam said: \"Tea bag water filter technology sounds good, especially since it is a step-by-step process and no mixing is required.
\"One possible limitation is that tea bags are only used to produce one liter of drinking water once.
How many tea bags a family needs every day is hard to answer. . .
It must be very, very cheap.
\"Even though it\'s low
For those who live on a dollar a day, costs can be a problem, or less, and Professor Cloete believes that small surcharges for Western sales may help subsidize costs in the developing world.
\"The high end can sponsor the low end, which can benefit millions of people by paying them,\" he said . \".
\"Teabag\" is not the only interesting filtration technology on the horizon, and researchers in California are developing a filter that uses nanotechnology and silver to produce clean water.
It works using a grid of tiny carbon cylinders-
Called nanotubes. -
And Silver lines.
It is well known that silver can kill bacteria, but the addition of current makes the process more effective, killing 98% of bacteria.
\"The filtered bacterial concentration depends on the initial concentration of bacteria in the water,\" said Dr. Cui, a developer at Stanford University . \".
\"If the initial concentration is too high, one may need to do more filtration using the device we have now.
However, we are trying to optimize our filter to make it more effective.
Maybe you will get \"safe\" water after only one filter.
\"Although there is still a way to go for the commercial version, Dr. Cui thinks there may be a large scale
The market version of his technology.
\"It can be commercialized,\" he said . \"
\"I think it is certainly affordable for people in developing countries.
In addition, if you consider the cost, you also need to consider the life of the equipment.
This is not-
Because our filters are reusable.
\"The power required to run the filter can be provided by any device that can provide a voltage of 20 V, such as a small solar panel.
Dr. Cui hopes that there will be only 9-
The power supply of Volt is necessary.
For Legesse and Oxfam, the main problem with nanotechnology solutions is that they are affordable and can be replicated at low cost in developing countries.
\"But we feel that such innovations will have an impact on our efforts to provide drinking water in our projects, and we want to see research work succeed,\" he said . \".