Stevens Institute of Technology

Xiaoguang Meng

George P Korfiatis

Christos Christodoulatos

Mazakhir Dadachov

Chan Han

William I Harris

David J Moll

Harlan Robert Goltz

Fredrick W Vance

Geofrey Paul Onifer

Daniel B Rice

Robert E Reim

Dilhan M Kalyon

Mahmoud Wazne

Dimitris Dermatas

Maria Kaouris

John J Morris

A method for removing dissolved contaminants from solution using a surface-activated crystalline titanium oxide product having a high adsorptive capacity and a high rate of adsorption with respect to dissolved contaminants, in particular, arsenate and arsenite. Preferably, the titanium oxide product includes crystalline anatase having primary crystallite diameters in the range of 1-30 nm. The surface-activated titanium oxide is combined with other filter media to further improve the removal of dissolved contaminants.

Methods of preparing a surface-activated titanium oxide product and of using same in water treatment processes

A process for stabilizing chromium in a chromite ore processing residue (COPR) comprises the steps of adding an acid to consume the excess alkalinity of the COPR, resulting in a pH of less than 10; and adding a chemical reductant to the COPR to convert any hexavalent chromium present to trivalent chromium. A source of sulfate may be added to the COPR to reduce heave potential and improve its geotechnical stability. Treated COPR may be encapsulated in a material suitable to prevent contact between the COPR and water, such as an asphalt.

Method of treatment, stabilization and heave control for chromite ore processing residues (COPR) and chromium contaminated soils

A water filtration device () and method which removes heavy metals and organic compounds from raw water is provided.

Iron powder and sand filtration process for treatment of water contaminated with heavy metals and organic compounds

A method for producing a surface-activated crystalline titanium oxide product having a high adsorptive capacity and a high rate of adsorption with respect to dissolved contaminants includes the steps of preparing a titanium oxide precipitate from a mixture comprising a hydrolysable titanium compound and heating the precipitate at a temperature of less than 300&#xb0; C., without calcining the precipitate. Preferably, the titanium oxide product includes crystalline anatase having primary crystallite diameters in the range of 1-30 nm. The surface-activated crystalline titanium oxide product is used in methods to remove dissolved inorganic contaminants from dilute aqueous streams by suspending the product in an aqueous stream or by filtering an aqueous stream through a bed of the product. In another method, a hydrolysable titanium compound is added to an aqueous stream so that titanium oxides form as a co-precipitate with dissolved contaminants within a bed of particulate material.

Growing community of inventors

Highland Park, NJ, United States of America

Xiaoguang Meng