Patents Assigned to Parkner GmbH
  • Method of treating an organic sludge, especially paint sludge
    Patent number: 5174898
    Abstract: A paint sludge is subjected to aerobic biodegradation with increased dry content of the resulting sludge and the latter is then subjected to anaerobic biological degradation. The effluent from the two biostages are sterilized by ozonization, UV-irradiation or peroxide addition. The sludge from the anaerobic biostage can be dried to an inert granulate and drying vapors are recycled to the aerobic biostage. The sterile liquid is returned to the wash water circulation of the painting plant.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: December 29, 1992
    Assignee: Parkner GmbH
    Inventors: Otto Stuckmann, Peter Hombach, Wolfgang Ruger, Karl Grosse, Wolfgang Leiner, Winfried Schmidt, Reinhard Diekmann