Patents Assigned to Tokyo Metropolitan Sewerage Service Corp.
  • Method and apparatus for controlling sludge dewatering
    Patent number: 5382356
    Abstract: The feature of the present invention resides in that when a polyelectrolyte coagulant is added to sludge to dewater the sludge in a sewage treatment plant, the dosage level of the polyelectrolyte coagulant to be to the sludge is controlled most properly, whereby moisture content of dewatered cake can be minimized.
    Type: Grant
    Filed: June 10, 1992
    Date of Patent: January 17, 1995
    Assignees: Tokyo Metropolitan, Tokyo Metropolitan Sewerage Service Corp., Japan Organo Co., Ltd.
    Inventors: Makoto Thogho, Tamotsu Hattori, Noboru Okazaki, Kozaburo Akamatus, Tomoyuki Hayashi, Tomohiko Kusumi