Patents Assigned to Zenata N.V.
  • Patent number: 5078868
    Abstract: A method and apparatus for cleansing contaminated soil (11), the apparatus includes an extraction vessel (12) into which contaminated soil (11) is delivered together with a solvent. A slurry is produced which is delivered to a settler (18) which produces a settler underflow and contaminated solvent. The settler (18) underflow is delivered to a drier (23). The contaminated solvent passes through a filter (20) which produces a filter cake also delivered to the drier (23). The contaminated solvent passes through a distillation column (28) and is subsequently delivered to a plasma gun (35) whereat the contaminants are oxidized.
    Type: Grant
    Filed: April 11, 1990
    Date of Patent: January 7, 1992
    Assignee: Zenata N.V.
    Inventor: Struan Robertson