Patents by Inventor Colin N. Dougald

Colin N. Dougald has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for treating waste water oxidation ponds to abate malodors
    Patent number: 5387344
    Abstract: A process and an apparatus for treating waste water in oxidations ponds, oxidation ditches, or other bodies of water in a waste water treatment facility to abate the malodors caused by the presence of volatile contaminants. In the process, a water stream is withdrawn from the body of waste water and contacted with an air stream in an air-water contact apparatus. The water stream is thereby aerated and stripped of potentially odor causing volatile contaminants and an off-gas stream is produced containing the stripped volatile contaminants. At least a portion of the aerated and stripped water stream is returned to the body of waste water to inhibit anaerobic decomposition of organic impurities.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: February 7, 1995
    Assignee: Monsanto Enviro-Chem Systems, Inc.
    Inventors: David E. McCombs, Colin N. Dougald, Martin L. Rapp