REGROUNDColloidal Iron Oxide Nanoparticles for the REclamation of Toxic Metal Contaminated GROUNDwater aquifers, drinking water wells, and river bank filtrations (2015-2018, EU H2020) aimed at the application and up-scaling to market of a remediation technology based on the use of nanomaterials, which has already been developed in previous projects. Goethite nanoparticles are being applied for the removal of heavy metals from two contaminated sites.