Patents Assigned to Shikoku Paper Mfg. Co., Ltd.
  • Method of purification of waste water by treatment with zirconium salt
    Patent number: 4097377
    Abstract: The present invention relates to a method of purification of waste water from chemical pulping and paper mills comprising coagulation and precipitation of suspended substances and colloidal dispersed particles, precipitation of non-colloidal dissolved, low molecular weight substances in the waste water and formation of water insoluble precipitates or chelates thereof, and further to a method of purification of waste water of any source of the use of zirconium salt.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: June 27, 1978
    Assignee: Shikoku Paper Mfg. Co., Ltd.
    Inventor: Buichiro Ayukawa
  • Method of purification of waste water by treatment with zirconium salt
    Patent number: 4066542
    Abstract: The present invention refers to a method of purification of waste water from chemical pulping and paper mills comprising coagulate and precipitate suspended substances and colloidal dispersed particles, and precipitation of non-colloidal dissolved, low molecular weight substances in the waste water and form water insoluble precipitates or chelates thereof, and further to a method of purification of waste water of any source by the use of zirconium salt.
    Type: Grant
    Filed: August 9, 1976
    Date of Patent: January 3, 1978
    Assignee: Shikoku Paper Mfg. Co., Ltd.
    Inventor: Buichiro Ayukawa
  • Method of purification of waste water by treatment with zirconium salt
    Patent number: 3997439
    Abstract: The present invention relates to a method of purification of waste water from chemical pulping and paper mills comprising coagulation and precipitation of suspended substances and colloidal dispersed particles, precipitation of non-colloidal dissolved, low molecular weight substances in the waste water and formation of water insoluble precipitates or chelates thereof, and further to a method of purification of waste water of any source by the use of zirconium salt.
    Type: Grant
    Filed: November 1, 1974
    Date of Patent: December 14, 1976
    Assignee: Shikoku Paper Mfg. Co., Ltd.
    Inventor: Buichiro Ayukawa