Arsenic and TOC are removed from drinking water or wastewaters by use of finely-divided metallic iron in the presence of powdered elemental sulfur or other sulfur compounds such as manganese sulfide, followed by an oxidation step. A premix may be produced for this process, by adding the iron, sulfur...http://www.google.es/patents/US5575919?utm_source=gb-gplus-sharePatente US5575919 - Method for removing toxic substances in water
