Michael D Fagan

US Patent:

6773604, Aug 10, 2004

Filed:

Aug 17, 2001

Appl. No.:

09/932042

Inventors:

John R. Walton - Colfax CA
Scott W. Duggan - Laguna Niguel CA
Michael R. Fagan - Blairstown NJ

Assignee:

U.S. Peroxide LLC - Laguna Niguel CA

International Classification:

B01D 2100

US Classification:

210710, 210711, 210722, 210759, 210916

Abstract:

A cost-effective method for reducing the dissolved sulfide content in a wastewater stream and thereby hydrogen sulfide emissions therefrom involving the steps of adding a transition metal salt to the wastewater stream at the upper reaches of a wastewater collection system prior to at least some hydrogen sulfide volatilization followed by addition of an oxidant to the wastewater stream to generate elemental sulfur and a transition metal salt which subsequently participates in additional hydrogen sulfide capturing steps, thereby also improving water quality and wastewater treatment plant operations.

US Patent:

7147783, Dec 12, 2006

Filed:

Jun 1, 2004

Appl. No.:

10/858113

Inventors:

John R. Walton - Colfax CA, US
Scott W. Duggan - Laguna Niguel CA, US
Michael R. Fagan - Blairstown NJ, US

Assignee:

U.S. Peroxide, LLC - Laguna Niguel CA

International Classification:

B01D 21/00

US Classification:

210719, 210722, 210729, 210732, 210752, 210757, 210759

Abstract:

A cost-effective method for reducing the dissolved sulfide content in a wastewater stream and thereby hydrogen sulfide emissions therefrom involving the steps of adding a transition metal salt to the wastewater stream at the upper reaches of a wastewater collection system prior to at least some hydrogen sulfide volatilization followed by addition of an oxidant to the wastewater stream to generate elemental sulfur and a transition metal salt which subsequently participates in additional hydrogen sulfide capturing steps, thereby also improving water quality and wastewater treatment plant operations.

US Patent:

8052872, Nov 8, 2011

Filed:

Feb 13, 2009

Appl. No.:

12/370878

Inventors:

John R. Walton - Colfax CA, US
Michael Fagan - Blairstown NJ, US
Ian M. Watson - Carlsbad CA, US
Chester L. Szczucki - Bristol PA, US

Assignee:

U.S. Peroxide LLC - Atlanta GA

International Classification:

C02F 3/30

US Classification:

210605, 210609, 210631

Abstract:

Methods of enhancing anaerobic digestion of wastewater are provided. The methods comprise pressure oxidation of digester material to remove sulfide and/or regenerate iron. Also provided are a pressure oxidizer device and a wastewater treatment system having one or more of such devices. The methods, device, and system have application in treatment of municipal wastewater, wastewater of agricultural and livestock operations, and in biofuels production.

US Patent:

20160200605, Jul 14, 2016

Filed:

Aug 21, 2014

Appl. No.:

14/913553

Inventors:

- London, CA
John R. Walton - Colfax CA, US
Michael Fagan - Blairstown NJ, US

International Classification:

C02F 1/72

Abstract:

There is described a process for treatment of a fluid comprising an oxidizable contaminant. The process comprises the step of contacting the wastewater with a combination of: (i) a sulfide, (ii) a complex of Fe(III) and a chelating agent, and (iii) an oxidant. It has been discovered that of treatment of a fluid containing an oxidizable contaminant employing iron(III)-chelates as the Fenton catalyst may be significantly improved by including a sulfide in the reaction scheme. As described herein, by employing sulfide ion, the present inventors have been able to: (i) increase the rate of iron recycling from minutes or hours to a few seconds, and (ii) destroy benzene in an oil and gas refinery (OGR) wastewater in less than one minute. It is believed that these findings in OGR wastewater can be extended to other fluids containing other oxidizable contaminants.