Every year over 100,000 compact discs become obsolete and are thrown away. Toxic chemicals, including cancerous Bisphenol-A, are released into our water streams and eventually get into the food we eat. Now Taiwanese researchers are trying to do more than ugly lamps with the obsolete CDs; they created a wastewater treatment that turns sewage into safe drinking water. This system is cheap and the technology already available.

Picture credit: kismihok CC BY 2.0