Patents Assigned to Earthclean Co., Ltd.
  • Sewage treatment apparatus
    Patent number: 6881332
    Abstract: In the present invention, solid contents 38, which are collected by a solid-liquid separation device 33 in a solid-liquid separation tank 14 and charged into a decomposing treatment tank 11, are decomposed to water and CO2 by the action of aerobic microbes and the air (oxygen) supplied from a lower aeration tank 12 and substantially disappear. The oil contents contained in the water having been decomposed is removed by an oil-water separation tank 13.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: April 19, 2005
    Assignee: Earthclean Co., Ltd.
    Inventors: Hiroshi Ogawa, Kazuyuki Akiya