Patents Assigned to Siderurgiemaritime-Maritime Staalnijverheid
  • Waste water purification processes
    Patent number: 4160725
    Abstract: Waste water from coke ovens is purified by passing the waste water and a stripping fluid through a stripping column in counterflow. Non-volatile ammonium compounds are removed in one region of the column, phenolic compounds are removed in another region, and volatile ammonium compounds are removed in yet another region. The region in which phenolic compounds are removed is disposed at such a location that no ammoniacal vapor can traverse it. An acid and a strong base are fed laterally into the column at two different levels.
    Type: Grant
    Filed: March 23, 1978
    Date of Patent: July 10, 1979
    Assignees: Centre de Recherches Metallurgiques-Centrum voor Research in de Metallurgie, Siderurgiemaritime-Maritime Staalnijverheid
    Inventors: Christian Josis, Andre Hans