Biochar filter for arsenic

The topic of arsenic-contaminated water has been an important one in many parts of the developing and developed world for decades. Now, a team at the University of Florida, Gainesville, USA, has at last developed an inexpensive and cheap filter for extracting this toxic ion from water. Writing in the journal Water Research, Bin Gao and his colleagues explain how iron-enhanced carbon cooked from hickory chips, biochar, can remove arsenic effectively. Current arsenic removal methods involve precipitation, the addition of lime or coagulants to the water, or complicated membrane or ion exchange systems. A simple biochar filter would benefit from ease of operation and low cost.