"Superparamagnetic" particles used to harvest phosphorus from polluted water
By Ben Coxworth
March 27, 2014
Phosphorus is a mineral that's widely used in fertilizer, which itself has an unfortunate tendency to leach out of farmers' fields and into our waterways. Now, researchers from Germany's Fraunhofer Institute for Silicate Research have devised a method of retrieving some of that phosphorus from the water – thus both reducing pollution, and providing a source of reclaimed phosphorus.
The Fraunhofer team has been using superparamagnetic particles, which are ordinarily non-magnetic, but that turn magnetic when exposed to a magnetic field. These particles also contain bonding sites for phosphorus, and are added to phosphorus-polluted water. When this happens, the phosphorus anions in the water bond with the particles.
The particles, along with the attached anions, are then removed from the water simply using a magnet. The water, meanwhile, is left phosophorus-free.
Apparently the technology could be tweaked to remove other types of pollutants, such as heavy metals, by applying different types of bonding sites to the particles.
Fraunhofer developed the system in collaboration with the University of Stuttgart.
- Around The Home
- Digital Cameras
- Good Thinking
- Health and Wellbeing
- Holiday Destinations
- Home Entertainment
- Inventors and Remarkable People
- Mobile Technology
- Urban Transport
- Wearable Electronics
- 2014 Action Camera Comparison Guide
- 2014 Smartwatch Comparison Guide
- 2014 Windows 2-in-1 Comparison Guide
- 2014 Smartphone Comparison Guide
- 2014 Full Frame DSLR Comparison Guide
- 2014 Tablet Comparison Guide
- 2014 Superzoom Camera Comparison Guide
- 2014 iPad Comparison Guide
- 2014 Entry-Level to Enthusiast DSLR Comparison Guide
- 2014 Small Compact Camera Comparison Guide