Title:
【発明の名称】パルプ及び紙製造工程からの流出液からの有機物質の除去方法
Document Type and Number:
Japanese Patent JPH03500791
Kind Code:
A
Abstract:
PCT No. PCT/SE88/00512 Sec. 371 Date Oct. 29, 1990 Sec. 102(e) Date Oct. 29, 1990 PCT Filed Oct. 6, 1988 PCT Pub. No. WO89/03911 PCT Pub. Date May 5, 1989.A method of removing dissolved and colloidal macro-molecular organic substances from effluents from processes used in the manufacture of pulp and paper, wherein an acid sludge containing cellulose fibres and being acidified to a pH value of 1.6-2.5, is added to an effluent containing said organic substances, and the pH value is adjusted to 4.5-6.0 before the mixture is subjected to sedimentation to achieve precipitation of the fibres with said organic substances adhered thereto. According to the invention the fibres used as precipitant are subjected to mechanical treatment prior to said acidification, so that the fibres are broken and split open, increasing their specific fibre surface and thereby their ability to catch the organic substances in the effluent.
Inventors:
Finninen, Perutti
Application Number:
JP50888188A
Publication Date:
February 21, 1991
Filing Date:
October 06, 1988
Export Citation:
Assignee:
A. Afulstrom Corporation
International Classes:
C02F1/28; C02F1/52; C02F1/66; D21C11/00; D21F1/66; (IPC1-7): C02F1/52; D21C11/00; D21F1/66
Attorney, Agent or Firm:
Akira Asamura (3 outside)