Patents by Inventor Arnold Mulder

Arnold Mulder 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).

  • Anoxic ammonia oxidation
    Patent number: 5259959
    Abstract: A biological denitrification is provided in which ammonium ion is used as an electron donor in the denitrification. The process may advantageously be used under conditions of high ammonium ion concentrations in waste water or to remove ammonium ion from manure, soil or surface water. Microorganisms are described which may be used in these processes.
    Type: Grant
    Filed: October 25, 1991
    Date of Patent: November 9, 1993
    Assignee: Gist-Brocades N.V.
    Inventor: Arnold Mulder
  • Startup openings in a three-phase gaslift loop reactor
    Patent number: 5256380
    Abstract: Reduction of the hysteresis effects in a gaslift loop reactor is effected with a draft tube for solids suspension. The gas or liquid flow rates for generating complete solid suspension are significantly higher than the flow rates necessary for maintaining that state. These hysteresis effects may be significantly reduced and a substantial reduction is obtained for the energy necessary to obtain the state of suspension. Preferably a draft tube which comprises openings through which an extra circulation takes place especially during the startup phase is used.
    Type: Grant
    Filed: April 22, 1991
    Date of Patent: October 26, 1993
    Assignee: Paques B.V.
    Inventors: Arnold Mulder, Rene Weltevrede
  • Anoxic ammonia oxidation
    Patent number: 5078884
    Abstract: A biological denitrification is provided in which ammonium ion is used as an electron donor in the denitrification. The process may advantageously be used under conditions of high ammonium ion concentrations in waste water or to remove ammonium ion from manure, soil or surface water. Microorganisms are described which may be used in these processes.
    Type: Grant
    Filed: October 4, 1989
    Date of Patent: January 7, 1992
    Assignee: Gist-Brocades N.V.
    Inventor: Arnold Mulder
  • Anaerobic purification of waste water containing sulfate and organic material
    Patent number: 4735723
    Abstract: Waste water containing sulfate and organic material is purified by anaerobic biological waste water treatment where at least 80% of the sulfate is converted into hydrogen sulfide in an acidification process and at least 70% of the resulting hydrogen sulfide is removed from the waste water.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: April 5, 1988
    Assignee: Gist Brocades N. V.
    Inventor: Arnold Mulder
  • Waste water purification
    Patent number: 4384956
    Abstract: A novel process for the purification of waste water and/or waste water sludge comprising subjecting the waste water and/or waste water sludge to first a methane fermentation step, then a denitrification step and finally an oxidation step by aeration, the electron donor in the denitrification step being mainly the sulfide from the methane fermentation step and the remaining reduced compounds in the liquid effluent from the methane fermentation step being oxidized in the aeration step.
    Type: Grant
    Filed: November 3, 1981
    Date of Patent: May 24, 1983
    Assignee: Gist-Brocades N.V.
    Inventor: Arnold Mulder