Soil and sediment remediation

US10124378B2 · kind B2 · utility

Assignee

• ENVIT, ENVIRONMENTAL TECHNOLOGIES AND ENGINEERING LTD. · SI

Inventors

• Domen Lestan · Madison, US
• Neza Finzgar · Mirna, SI
• Marko Gerl · Ljubljana, SI
• Simon Gluhar · Žirovnica, SI
• Gorazd Lakovic · Škofljica, SI
• Branko Hamiti · Log pri Brezovici, SI

Key dates

• Filing date: Sep 27, 2016
• Grant date: Nov 13, 2018
• Expiry date: Dec 20, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A batch process of remediation of soil and sediment contaminated with toxic metals includes the steps of treating contaminated soil and sediment with a solution containing aminopolycarboxylic chelating agent, rinsing the soil/sediment solid phase to remove residues of mobilized toxic metals, treating the used process waters to recycle chelating agent and clean process solutions and placing the remediated soil/sediment on a permeable horizontal reactive barrier to prevent emission of contaminants. In the batch process, toxic metals are removed from process solutions by alkaline adsorption of polysaccharide adsorbents. By applying alkaline adsorption the efficiency of toxic metal removal from process solutions and alkaline and acidic recycling of chelating agent is significantly improved.