Patents Assigned to WRT International LLC
  • Radium removal from aqueous media using zeolite materials
    Patent number: 10875787
    Abstract: Systems and methods are provided for the removal and disposal of radium form an aqueous medium. The systems and methods include the removal of radium from a source by contact with either natural or synthetic zeolite. The spent zeolite is monitored for radiation levels and replaced with fresh zeolite when the level of radioactivity reaches approximately 9,000 pCi/g. Spent zeolite is disposed of at a low-level radioactive waste site. A system for monitoring and maintaining radium removal and disposal by an off-site provided is also disclosed.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: December 29, 2020
    Assignee: WRT INTERNATIONAL LLC
    Inventors: John E. Litz, Charles S. Williams
  • Radium removal from aqueous media using zeolite materials
    Patent number: 9908788
    Abstract: Systems and methods are provided for the removal and disposal of radium form an aqueous medium. The systems and methods include the removal of radium from a source by contact with either natural or synthetic zeolite. The spent zeolite is monitored for radiation levels and replaced with fresh zeolite when the level of radioactivity reaches approximately 9,000 pCi/g. Spent zeolite is disposed of at a low-level radioactive waste site. A system for monitoring and maintaining radium removal and disposal by an off-site provided is also disclosed.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: March 6, 2018
    Assignee: WRT INTERNATIONAL LLC
    Inventors: John E. Litz, Charles S. Williams
  • Method for removing cationic contaminants from water using natural zeolite underloaded with transition metal ions to limit leakage of intrinsic arsenic therefrom
    Patent number: 8663479
    Abstract: Methods and compositions for removing radium from drinking water using a natural zeolite.
    Type: Grant
    Filed: November 20, 2007
    Date of Patent: March 4, 2014
    Assignee: WRT International LLC
    Inventors: John E. Litz, Charles S. Williams
  • Dynamic up-flow zeolite system and method
    Patent number: 7807057
    Abstract: Systems and methods are provided for the removal of a contaminate from an aqueous medium using a zeolite-based sorption column. The systems and methods include an optimized relationship between the hydraulic loading, zeolite mesh size, distribution of zeolite mesh sizes and zeolite bed volume expansion to provide a highly effective sorption column that resists clogging while increases capacity.
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: October 5, 2010
    Assignee: WRT International LLC
    Inventors: Charles S. Williams, Jody Kelso, David Jones
  • Methods for purging absorptive materials used in the removal of contaminates from an aqueous medium
    Patent number: 7713424
    Abstract: Methods, systems and apparatus are provided for purging an adsorptive material of entrapped particulates. Methods, systems and apparatus rely upon a reverse loop for reversing the flow of medium within an adsorption material, allowing particulates caught within the adsorption material to be preferentially moved through and out of the adsorption material.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: May 11, 2010
    Assignee: WRT International LLC
    Inventors: Charles S. Williams, Scott E. Heffner
  • Methods for Purging Absorptive Materials Used in the Removal of Contaminates from an Aqueous Medium
    Publication number: 20090236289
    Abstract: Methods, systems and apparatus are provided for purging an adsorptive material of entrapped particulates. Methods, systems and apparatus rely upon a reverse loop for reversing the flow of medium within an adsorption material, allowing particulates caught within the adsorption material to be preferentially moved through and out of the adsorption material.
    Type: Application
    Filed: March 18, 2009
    Publication date: September 24, 2009
    Applicant: WRT International LLC
    Inventors: Charles S. Williams, Scott E. Heffner
  • System and apparatus for purging absorptive materials used in the removal of contaminates from an aqueous medium
    Patent number: 7520987
    Abstract: Methods, systems and apparatus are provided for purging an adsorptive material of entrapped particulates. Methods, systems and apparatus rely upon a reverse loop for reversing the flow of medium within an adsorption material, allowing particulates caught within the adsorption material to be preferentially moved through and out of the adsorption material.
    Type: Grant
    Filed: November 15, 2006
    Date of Patent: April 21, 2009
    Assignee: WRT International LLC
    Inventors: Charles S. Williams, Scott E. Heffner
  • Arsenic removal from aqueous media using chemically treated zeolite materials
    Patent number: 7476311
    Abstract: Systems and methods are provided for the removal and disposal of arsenic from an aqueous medium. The systems and methods include the removal of arsenic from a source by contact with either a chemically treated natural or synthetic zeolite, for example a ferric-loaded zeolite. The spent zeolite is disposed of at an appropriate arsenic disposal site. A system for monitoring and maintaining an arsenic removal/disposal system by an off-site provider is also disclosed.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: January 13, 2009
    Assignee: WRT International LLC
    Inventors: John E. Litz, Charles S. Williams
  • Regeneration of chemically treated zeolite
    Patent number: 7390414
    Abstract: Systems and methods are provided for the removal and disposal of arsenic from an aqueous medium. The systems and methods include the removal of arsenic from a source by contact with either a chemically treated natural or synthetic zeolite, for example a ferric-loaded zeolite. The spent zeolite is disposed of at an appropriate arsenic disposal site. A system for monitoring and maintaining an arsenic removal/disposal system by an off-site provider is also disclosed.
    Type: Grant
    Filed: January 18, 2005
    Date of Patent: June 24, 2008
    Assignee: WRT International LLC
    Inventor: Charles S. Williams
  • DYNAMIC UP-FLOW ZEOLITE SYSTEM
    Publication number: 20080110832
    Abstract: Systems and methods are provided for the removal of a contaminate from an aqueous medium using a zeolite-based sorption column. The systems and methods include an optimized relationship between the hydraulic loading, zeolite mesh size, distribution of zeolite mesh sizes and zeolite bed volume expansion to provide a highly effective sorption column that resists clogging while increases capacity.
    Type: Application
    Filed: January 18, 2008
    Publication date: May 15, 2008
    Applicant: WRT International LLC
    Inventors: CHARLES WILLIAMS, Jody Kelso, David Jones
  • Method for removal and destruction of ammonia from an aqueous medium
    Patent number: 7326348
    Abstract: Methods and apparatuses are provided for the removal and destruction of ammonia from an aqueous medium. The methods and apparatuses include the removal of ammonia from an aqueous medium by contact with either natural or synthetic zeolite. The spent zeolite is regenerated for continuous use, while the ammonia is concentrated as ammonium sulfate, and ultimately destroyed via combustion. A system for monitoring and maintaining an ammonia removal system by an off-site provider is also disclosed.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: February 5, 2008
    Assignee: WRT International LLC
    Inventors: John E. Litz, Charles S. Williams
  • Dynamic up-flow zeolite system and method
    Patent number: 7326347
    Abstract: Systems and methods are provided for the removal of a contaminate from an aqueous medium using a zeolite-based sorption column. The systems and methods include an optimized relationship between the hydraulic loading, zeolite mesh size, distribution of zeolite mesh sizes and zeolite bed volume expansion to provide a highly effective sorption column that resists clogging while increases capacity.
    Type: Grant
    Filed: October 28, 2004
    Date of Patent: February 5, 2008
    Assignee: WRT International LLC
    Inventors: Charles S. Williams, Jody Kelso, David Jones
  • Systems and methods for removal of contaminates from an aqueous media in the absence of modified nitrate levels
    Publication number: 20070215552
    Abstract: Systems and methods are provided for the removal of contaminates from an aqueous medium using an anion exchange based material. The systems and methods include an optimized relationship between the removal of the contaminate and unmodified discharged levels of nitrate.
    Type: Application
    Filed: September 15, 2006
    Publication date: September 20, 2007
    Applicant: WRT International LLC.
    Inventors: Charles Williams, Scott Heffner
  • Apparatus for removal and destruction of ammonia from an aqueous medium
    Patent number: 7108784
    Abstract: Methods and apparatuses are provided for the removal and destruction of ammonia from an aqueous medium. The methods and apparatuses include the removal of ammonia from an aqueous medium by contact with either natural or synthetic zeolite. The spent zeolite is re-generated for continuous use, while the ammonia is concentrated as ammonium sulfate, and ultimately destroyed via combustion. A system for monitoring and maintaining an ammonia removal system by an off-site provider is also disclosed.
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: September 19, 2006
    Assignee: WRT International LLC
    Inventors: John E. Litz, Charles S. Williams
  • Hexa-valent chromium removal from aqueous media using ferrous-form zeolite materials
    Patent number: 7105087
    Abstract: Systems and methods are provided for the removal and disposal of chromium form an aqueous medium. The systems and methods include the removal of chromium from a source by contact with either natural or synthetic zeolite that has been modified with a ferrous ion or other like substance. The spent zeolite is disposed of and replaced with freshly modified zeolite. In some cases the systems and methods are performed under de-oxidizing conditions.
    Type: Grant
    Filed: September 17, 2003
    Date of Patent: September 12, 2006
    Assignee: WRT International LLC
    Inventor: John E. Litz