Patents Assigned to Japan Sewage Works Agency
  • Coagulation reaction tank
    Patent number: 5160041
    Abstract: A coagulation reaction tank comprises a cylindrical tank provided in the central part thereof with a rotary stirring mechanism furnished with stirring vanes and a filtration tank for introducing the liquid from within the cylindrical tank in the form of filtrate and discharging the filtrate out of the cylindrical tank. This coagulation reaction tank is characterized by the fact that the filtration tank provided in the bottom thereof with slits is disposed in the cylindrical tank above the stirring vanes or the cylindrical tank provided in the upper part of the wall thereof with slits and the filtration tank is disposed outside the slits.
    Type: Grant
    Filed: March 24, 1992
    Date of Patent: November 3, 1992
    Assignees: Japan Sewage Works Agency, Kurita Water Industries Ltd.
    Inventors: Naohiro Taniguchi, Syuzo Koike, Yasuhiko Watanabe, Tadao Takeuchi, Noboru Fujiwara
  • Coagulation reaction tank
    Patent number: 5069784
    Abstract: A coagulation reaction tank comprises a cylindrical tank provided in the central part thereof with a rotary stirring mechanism furnished with stirring vanes and a filtration tank for introducing the liquid from within the cylindrical tank in the form of filtrate and discharging the filtrate out of the cylindrical tank. This coagulation reaction tank is characterized by the fact that the filtration tank provided in the bottom thereof with slits is disposed in the cylindrical tank above the stirring vanes or the cylindrical tank provided in the upper part of the wall thereof with slits and the filtration tank is disposed outside the slits.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: December 3, 1991
    Assignees: Japan Sewage Works Agency, Kurita Water Industries Ltd.
    Inventors: Naohiro Taniguchi, Syuzo Koike, Yasuhiko Watanabe, Tadao Takeuchi, Noboru Fujiwara
  • System for treating waste water by nitrification
    Patent number: 5061368
    Abstract: A system for treating waste water using a particulate body formed by covering and fixing nitrifying bacteria. In the system, the particulate body is inserted in a nitrifying vessel which including therein an air diffusion device for supplying oxygen to the nitrifying bacteria and a particulate body separation device for preventing the outflow of the particulate body. The nitrifying vessel and the particulate body contained therein are used as a nitrifying vessel unit and one or more such nitrifying vessel units are arranged within a treating tank. Waste water is circulated between the nitrifying vessel and the other portions of the treating tank than the nitrifying vessel by means of the air lift effect of the air diffused from the air diffusion device.
    Type: Grant
    Filed: February 16, 1990
    Date of Patent: October 29, 1991
    Assignees: Hitachi Plant Engineering & Construction Co., Ltd., Japan Sewage Works Agency
    Inventors: Minoru Tada, Syouji Harada, Syuzo Koike, Yukio Kawaguchi, Tamotsu Mizuguchi, Hiroyoshi Emori, Naomichi Mori, Toshio Yamadera, Masami Hotta, Hiroki Nakamura, Tatsuo Sumino, Takashi Kimata, Yuuko Fujii