Patents Assigned to Director General, Public Works Research Institute, Ministry of Construction
  • Process for treating organic waste water
    Patent number: 5006251
    Abstract: A process for treating organic waste water in which a first step provided the stage precedent to a second step using an aerobic filter bed employs an upward flow type solid-liquid separator packed with a filter medium, with the SS (suspended solids) removal at the preceding stage being performed at a high SS removal rate and in a short time.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: April 9, 1991
    Assignees: Director General, Public Works Research Institute, Ministry of Construction, Nishihara Environmental Sanitation Research Corporation Limited
    Inventors: Kazuo Takeishi, Yasuhiro Okubo, Takashi Itoh