NO971504L - Process of separate treatment of acidic and alkaline effluents from a bleaching plant - Google Patents

Process of separate treatment of acidic and alkaline effluents from a bleaching plant

Info

Publication number
NO971504L
NO971504L NO971504A NO971504A NO971504L NO 971504 L NO971504 L NO 971504L NO 971504 A NO971504 A NO 971504A NO 971504 A NO971504 A NO 971504A NO 971504 L NO971504 L NO 971504L
Authority
NO
Norway
Prior art keywords
acidic
alkaline
wastewater
bleaching plant
process stream
Prior art date
Application number
NO971504A
Other languages
Norwegian (no)
Other versions
NO971504D0 (en
Inventor
Johan Landfors
Hans Johansson
Mikael Engstroem
Original Assignee
Eka Chemicals Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from SE9403372A external-priority patent/SE9403372L/en
Priority claimed from SE9502169A external-priority patent/SE9502169D0/en
Application filed by Eka Chemicals Ab filed Critical Eka Chemicals Ab
Publication of NO971504L publication Critical patent/NO971504L/en
Publication of NO971504D0 publication Critical patent/NO971504D0/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
    • B01D5/009—Collecting, removing and/or treatment of the condensate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048—Purification of waste water by evaporation
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
    • D21C11/0028—Effluents derived from the washing or bleaching plants
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0042—Fractionating or concentration of spent liquors by special methods

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Wood Science & Technology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)

Abstract

Surt og alkalisk avløpsvann fra et blekeanlegg omfatter ulike mengder uorganisk og organisk mater- iale og har ulike mengder saltinnhold. Dersom det sure og det alkaliske avløpsvannet blandes, blir det vanskeligere å separere de ulike substanser fra prosesstrømmen i en påfølgende behandling, og det resulterer i større mengder avløpsvann, hvilket er ufordelaktig ved metoder hvor målet er å lukke blekeanlegget. Dessuten inntreffer problemer på grunn av dannelsen av inkrustasjoner på varmeover- førings-overflater. Den foreliggende oppfinnelse vedrører en forbedret fremgangsmåte ved behandling av prosessavløpsvannet fra et blekeanlegg, hvori den sure og alkaliske prosesstrøm konsentreres separat i fordampere, hvorved saltinnholdet i den sure prosesstrømmen reduseres ved elektrodialyse, og den alkaliske prosesstrømm forbrennes. Denne fremgangsmåte gjør det mulig å redusere mengden av resirkulert vann og unngå problemene tilknyttet prosessutstyret, og fremgangsmåten bidrar også til en høyere grad av lukking sogar når blekingen omfatter klorindioksid (ECF).Acidic and alkaline wastewater from a bleaching plant comprises different amounts of inorganic and organic material and has different amounts of salt content. Mixing the acidic and alkaline wastewater becomes more difficult to separate the various substances from the process stream into a subsequent treatment, resulting in larger amounts of wastewater, which is disadvantageous by methods where the aim is to close the bleaching plant. In addition, problems occur due to the formation of encrustations on heat transfer surfaces. The present invention relates to an improved method of treating the process wastewater from a bleaching plant, wherein the acidic and alkaline process stream is separately concentrated in evaporators, thereby reducing the salt content of the acidic process stream by electrodialysis and combining the alkaline process stream. This process makes it possible to reduce the amount of recycled water and avoid the problems associated with the process equipment, and the process also contributes to a higher degree of closure even when the bleaching comprises chlorine dioxide (ECF).

NO971504A 1994-10-05 1997-04-03 Process of separate treatment of acidic and alkaline effluents from a bleaching plant NO971504D0 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
SE9403372A SE9403372L (en) 1994-10-05 1994-10-05 Purification and recirculation of wastewater into a pulp barrel by electrodialysis or evaporation and combustion
US13995P 1995-06-12 1995-06-12
SE9502169A SE9502169D0 (en) 1995-06-14 1995-06-14 Process for purification of process water during pulping
US191495P 1995-06-20 1995-06-20
PCT/SE1995/001121 WO1996011299A1 (en) 1994-10-05 1995-10-03 A method for treating acid and alkaline waste streams from a bleach plant separately

Publications (2)

Publication Number Publication Date
NO971504L true NO971504L (en) 1997-04-03
NO971504D0 NO971504D0 (en) 1997-04-03

Family

ID=26662147

Family Applications (1)

Application Number Title Priority Date Filing Date
NO971504A NO971504D0 (en) 1994-10-05 1997-04-03 Process of separate treatment of acidic and alkaline effluents from a bleaching plant

Country Status (8)

Country Link
EP (1) EP0784721A1 (en)
JP (1) JPH10506964A (en)
AU (1) AU3712195A (en)
BR (1) BR9509188A (en)
CA (1) CA2201117A1 (en)
FI (1) FI971605A (en)
NO (1) NO971504D0 (en)
WO (1) WO1996011299A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5792315A (en) * 1995-02-27 1998-08-11 Eka Chemicals Ab Purifying aqueous effluent from a pulp mill using electro chemical membrane device
SE9500732L (en) * 1995-02-27 1996-08-28 Eka Chemicals Ab Procedure for the treatment of liquids
AU6641498A (en) 1997-03-07 1998-09-22 Akzo Nobel N.V. Process for treating wastewater
EP0863113A1 (en) * 1997-03-07 1998-09-09 Akzo Nobel N.V. Process for treating wastewater
DE60004258T2 (en) * 1999-11-02 2004-06-03 Shell Internationale Research Maatschappij B.V. METHOD FOR PURIFYING INDUSTRIAL WASTEWATER FROM A MANUFACTURING METHOD OF POLYPROPYLENE OXIDE
FR2809385A1 (en) * 2000-05-26 2001-11-30 Tsb Internat METHOD AND INSTALLATION FOR PURIFICATION AND DESALINATION OF SEA WATER
CN1321070C (en) * 2005-02-03 2007-06-13 刘德沛 Waste water treating method and multi-effect evaporator for propylene oxide production
CN104928963B (en) * 2015-05-08 2017-10-24 白博 A kind of reducing rules pulping waste liquor online high consistency extraction technique of zero-emission

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986951A (en) * 1975-11-18 1976-10-19 Champion International Corporation Chlorine-based bleachery effluent treatment
US4049490A (en) * 1976-02-23 1977-09-20 Veniamin Petrovich Zaplatin Electrodialysis of bleaching effluent
AU619580B2 (en) * 1988-08-23 1992-01-30 Sappi Limited Elimination of bleach effluents
FI85293C (en) * 1990-05-04 1992-03-25 Poeyry Jaakko & Co Oy FOERFARANDE FOER RENING OCH AOTERFOERING AV CELLULOSAFABRIKERS BLEKERIAVATTEN.

Also Published As

Publication number Publication date
JPH10506964A (en) 1998-07-07
BR9509188A (en) 1997-12-30
FI971605A0 (en) 1997-04-16
NO971504D0 (en) 1997-04-03
AU3712195A (en) 1996-05-02
CA2201117A1 (en) 1996-04-18
FI971605A (en) 1997-04-16
EP0784721A1 (en) 1997-07-23
WO1996011299A1 (en) 1996-04-18

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