Scientists in Saskatchewan are using ag waste to make clean water. Khaled Benis, a Vanier Scholar and Ph.D. candidate at the University of Saskatchewan’s college of engineering, and his colleagues, have identified how to transform wheat and canola straw into a filter capable of absorbing arsenic from water. Canada produces about 47 million tonnes of ag residue per year. “We make the (crop residue) similar to activated carbon or ion exchange resin that can be used as alternatives to expensive materials. Crop residue is available everywhere and is a sustainable material.” Benis told Farms.com. “We collect the residues and perform physical or chemical treatments to activate the potential to absorb the arsenic.”