Patents by Inventor Norbert Matsche

Norbert Matsche 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).

  • Activated sludge process for sewage purification
    Patent number: 5447633
    Abstract: In a two-stage activation plant, part of the activated sludge (sludge circuit (1)) from the first stage (11) is transferred to the second stage (12) and part of the activated sludge (sludge circuit (2)) from the second stage (12) is transferred to the first stage (11), so that mixed biocenoses are formed in both stages (11 and 12). The biomass to be denitrified from the first stage is transferred to the second stage by the sludge circuit (1) and the biomass to be nitrified from the second stage is transferred to the first stage by the sludge circuit (2), so that not only carbon compounds are decomposed but nitrogen compounds may be removed by nitrification and denitrification in both stages (11 and 12).
    Type: Grant
    Filed: February 3, 1994
    Date of Patent: September 5, 1995
    Assignee: Austrian Energy & Environment SGP/Waagner Biro GmbH
    Inventors: Norbert Matsche, Liang Guan