Patents by Inventor Douglas M. Kaupp

Douglas M. Kaupp 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).

  • Wastewater biological phosphorus removal process
    Patent number: 5480548
    Abstract: The present invention relates to a process for treating wastewater utilizing a step feed return activated sludge process. The wastewater is directed via one or more step feed points through a mainstream process. The step feed point includes at least one aerobic zone and at least one anoxic zone, in repeating or alternating sequence. A portion of effluent from the one or more anoxic zones are fed through at least one anaerobic zone to which raw or pretreated wastewater is fed and returned to the upstream portion of the anoxic zone. Additionally, return activated sludge may be recycled to one or more of the anoxic zones.
    Type: Grant
    Filed: December 28, 1993
    Date of Patent: January 2, 1996
    Assignee: CH2M Hill, Inc.
    Inventors: Glen T. Daigger, Joseph P. Stephenson, Daniel A. Nolasco, Dalton R. Stafford, Douglas M. Kaupp