Recovering phosphorus from sewage sludge ash to address problem of diminishing supplies of phosphorus ores

Valuable supplies of phosphorus could be recovered from sewage sludge ash, which remains after the sludge has been burned for electric power generation. The method has been developed by chemical engineers Yuuki Mochizuki and Naoto Tsubouchi at Hokkaido University's Center for Advanced Research of Energy and Materials. Their work is published in the journal Resources, Conservation and Recycling.