Saturday, July 27, 2013 | Latest audio lessons → VOA Learning English
Students Develop a New Way to Purify Water
From VOA Learning English, this is the Agriculture Report. Students at the University of Virginia have developed a new way of purifying water. They say it could bring improved water quality to millions of people in the developing world. They called it MadiDrop. Field testing begins recently in South Africa. The laboratory in which the MadiDrop is made operates like a kitchen. Workers add ingredients and mix, weigh, press and bake. What the workers are making is a ceramic disc that contains silver.
When the disc is dropped in water, silver ions are released to purify the water. Ions are atoms that have an electrical charge. Testing at the University of Virginia shows that the disc produces clean, safe water.
Beeta Ehdaie studies at the University of Virgina, she says her work is not only about making effective technology. It is also about making solutions for people in developing countries who don't have many resources.
Why the name "MadiDrop"? The word "madi" means water in Tshivenda, a language of Limpopo Province in South Africa. There, fifty women run a factory that makes water filters. The university started the factory last summer.
The women mix sawdust and clay to make flowerpot-shaped filters that they use to purify drinking water. The water flows through the filters is which trap bacteria and solid particles. The factory sells the filters to local families. But the MadiDrop is smaller and less expensive than the filters. Over the next few months, students will test the MadiDrop in South Africa. If the testing is successful, the South African women will make and sell the MadiDrops. The goal is to expand such factories to other developing countries and improve millions of lives.
For VOA Learning English, I'm Carolyn Presutti.