Patents Assigned to Roger H. Woods Limited
  • Publication number: 20090001000
    Abstract: An apparatus for treating liquid waste material includes first adding a chemical flocculent to the liquid waste material followed in a mixer to promote flocculation. The floc material is subsequently separated to produce a bulk clarified liquid, with the floc material being subjected to a solids separator to extract further bulk clarified liquid. The collected bulk clarified liquid is then recycled back in a recycle loop into at least one of the steps of adding a chemical flocculent and solids separation of the floc material. The apparatus is suitable for use with a wide variety of liquid waste materials ranging from agricultural and human waste to industrial waste. An apparatus for treating liquid waste material is also provided.
    Type: Application
    Filed: July 11, 2008
    Publication date: January 1, 2009
    Applicant: Roger H. Woods Limited
    Inventors: Doug Pullman, Roger H. Woods
  • Publication number: 20080223792
    Abstract: A flow-through mixing apparatus for incorporating a dry treatment product into a waste stream. The apparatus comprises a pump for directing a liquid waste from a storage pit/tank, a mixer that receives the liquid waste from the pump, and a valve downstream of the mixer for either recirculating the liquid waste back to the storage pit/tank via a recirculation conduit, or directing the liquid waste to a discharge conduit. The mixer comprising a jet nozzle, a venturi tube and a high-shear assembly. The recirculation conduit establishes a calibration loop for determining the appropriate treatment regimen based on the characteristics of the waste liquid. The recirculation conduit also permits the homogenization of the pit/tank contents prior to addition of the dry treatment product. The dry treatment product introduced in the region of the mixer is subjected high shear forces, thereby incorporating the dry treatment product into the waste stream with increased dispersion and reduced agglomeration.
    Type: Application
    Filed: July 5, 2006
    Publication date: September 18, 2008
    Applicant: ROGER H. WOODS LIMITED
    Inventors: Roger H. Woods, Doug Pullman
  • Patent number: 7214323
    Abstract: A method of treating fluid body waste material includes, separating the material into factions, in which the solids content of one faction is increased substantially relative to the originating waste material, while a second faction has an increased liquid content. Material is pumped from a storage facility, passing through a first screen. Retained solid material is removed from the screen while partially cleansed liquid passes to a holding tank. The partially cleansed liquid is then passed through one or more cyclone separators. The output containing larger particles is passed to a second, finer screen with further removal of solids. A further output from the cyclone separator, of substantially clean liquid is fed partly back into the holding tank and partly back into the storage facility. Agitation of the waste material in the storage facility can be provided.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: May 8, 2007
    Assignee: Roger H. Woods Limited
    Inventor: Douglas G. Pullman
  • Publication number: 20050205496
    Abstract: A process for treating liquid waste material, comprises first adding a chemical flocculent to the liquid waste material followed by mixing to promote flocculation. The floc material is subsequently separated to produce a bulk clarified liquid, with the floc material being subjected to a solids separation to extract further bulk clarified liquid. The collected bulk clarified liquid is then recycled back into at least one of the steps of adding a chemical flocculent and solids separation of the floc material. The process is suitable for use with a wide variety of liquid waste materials ranging from agricultural and human waste to industrial waste. An apparatus for treating liquid waste material is also provided.
    Type: Application
    Filed: January 21, 2005
    Publication date: September 22, 2005
    Applicant: Roger H. Woods Limited
    Inventors: Doug Pullman, Roger Woods
  • Publication number: 20040112847
    Abstract: A method of treating fluid body waste material includes, separating the material into factions, in which the solids content of one faction is increased substantially relative to the originating waste material, while a second faction has an increased liquid content. Material is pumped from a storage facility, passing through a first screen. Retained solid material is removed from the screen while partially cleansed liquid passes to a holding tank. The partially cleansed liquid is then passed through one or more cyclone separators. The output containing larger particles is passed to a second, finer screen with further removal of solids. A further output from the cyclone separator, of substantially clean liquid is fed partly back into the holding tank and partly back into the storage facility. Agitation of the waste material in the storage facility can be provided.
    Type: Application
    Filed: September 5, 2003
    Publication date: June 17, 2004
    Applicant: Roger H. Woods Limited
    Inventor: Douglas G. Pullman
  • Patent number: 6533946
    Abstract: An apparatus and method for recycling drilling mud contaminated with particulates, consists of channelling a stream of contaminated slurry onto a screen deck, with the partly cleansed liquid entering a mixing tank. Liquid within the tank is continually mixed. An exit conduit removes liquid from the tank on a continuous basis, where it is given an additional purification with a cyclonic separator. The heavier fraction is further screened, with the resulting purified liquid re-entering the tank. The lighter fraction exists the cyclonic separator, and a portion of the lighter liquid is withdrawn for use as a substantially cleansed liquid. Another portion of the lighter fraction is re-circulated back into the tank, thus providing multi passes through the system to provide enhanced purification. The cleansed liquid may be directed into a separate mixing apparatus, in which additional slurry-forming powder such as Bentonite is added for forming a new slurry.
    Type: Grant
    Filed: February 2, 2001
    Date of Patent: March 18, 2003
    Assignee: Roger H. Woods Limited
    Inventor: Doug Pullman
  • Patent number: 5779355
    Abstract: A multiple shear mixing apparatus for forming or treating solid-liquid mixtures including a pump selected for handling the solid-liquid mixtures, a rigid shear filter, a jet nozzle, a vacuum chamber surrounding the jet nozzle and having at least one port for introducing materials, a venturi tube coupled with the jet nozzle, a storage tank for the mixture having an internal jet mixer therein, the above components being connected in series such that storage tank contents are pumped through the screen filter, through the jet nozzle, through the chamber and through the venturi tube back to the storage tank. A bleed is fed preferably from between the shear filter and nozzle to drive the internal jet mixer. After cycling through this series of components until uniformly blended, product is withdrawn between the shear filter and nozzle.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: July 14, 1998
    Assignee: Roger H. Woods Limited
    Inventor: Douglas G. Pullman