Abstract: A flexible, nonstretchable, titanium, ladder anode for cathodic protection of steel reinforced concrete structures formed of multiple titanium strips including multiple electric current-carrying titanium strips. Ladder anodes of titanium without an electrocatalytically active metal coating can be used in a cathodic protection system operated at an anode current density up to about 20 milliamps per square foot. Ladder anodes of titanium having an electrocatalytically active metal coating are additionally useful at higher anode current densities. The ladder anodes form at the intersections of the strips less than 200 nodes per square meter and have a surface area of about 500 to about 900 square inches per pound.
Type:
Grant
Filed:
October 15, 1998
Date of Patent:
May 2, 2000
Assignee:
Huron Tech Canada, Inc.
Inventors:
John William Burgher, Dennis F. Dong, Richard E. Loftfield
Abstract: Method for the regeneration of active carbon and polymeric adsorbents having oxidizable, organic pollutants adsorbed thereon by electrochemical and chemical means and apparatus therefor. The method involves a desorption step and a decomposition step. Desorption is accomplished in one embodiment by flowing an aqueous stream at a preselected pH through the adsorbent material. Generally, decomposition is accomplished by contacting an aqueous stream containing an organic pollutant with hydroxyl radicals. Sequential or simultaneous desorption and decomposition can also take place during electrolysis in an electrolytic cell. During decomposition the active carbon can be made a carbon bed electrode of the cell. Electrolysis to produce peroxide can take place in the presence of a transition metal or a chelate of a transition metal while feeding an oxygen containing gas to the electrolysis cell.
Type:
Grant
Filed:
February 28, 1997
Date of Patent:
May 18, 1999
Assignee:
Huron Tech Canada, Inc.
Inventors:
Arthur L. Clifford, Dennis F. Dong, Timothy A. Mumby, Derek J. Rogers
Abstract: Method for the regeneration of active carbon having oxidizable, organic pollutants adsorbed thereon by electrochemical and chemical means and apparatus therefor. The method involves a desorption step prior to a decomposition step. Each step involves conducting electrolysis in a cell using the active carbon as a carbon bed electrode. It is advantageous to conduct the electrolysis in the presence of a transition metal or a chelate of a transition metal while feeding an oxygen containing gas to the electrolysis cell.
Type:
Grant
Filed:
December 20, 1996
Date of Patent:
December 30, 1997
Assignee:
Huron Tech Canada, Inc.
Inventors:
Arthur L. Clifford, Dennis F. Dong, Timothy A. Mumby, Derek J. Rogers
Abstract: An electrolytic cell and process for the cogeneration of a peroxy acid and salts thereof in an anolyte compartment of the cell and hydrogen peroxide at a desired ratio of an alkali metal hydroxide to hydrogen peroxide in the catholyte compartment of the cell. An ammonium compound is present as a reactant in the catholyte compartment. Ammonia is recycled from the catholyte compartment of the cell to the anolyte compartment of the cell or removed as a product.
Type:
Grant
Filed:
November 3, 1995
Date of Patent:
July 1, 1997
Assignee:
Huron Tech Canada, Inc.
Inventors:
Dennis F. Dong, Timothy Alan Mumby, John R. Jackson, Derek John Rogers