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FI20011131A7 - Recirculating water treatment method - Google Patents

Recirculating water treatment method Download PDF

Info

Publication number
FI20011131A7
FI20011131A7 FI20011131A FI20011131A FI20011131A7 FI 20011131 A7 FI20011131 A7 FI 20011131A7 FI 20011131 A FI20011131 A FI 20011131A FI 20011131 A FI20011131 A FI 20011131A FI 20011131 A7 FI20011131 A7 FI 20011131A7
Authority
FI
Finland
Prior art keywords
calcium ions
water
process water
paper
pulp manufacturing
Prior art date
Application number
FI20011131A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI20011131A0 (en
FI20011131L (en
Inventor
Ny Corinne Le
Hannu Leino
Heikki Pakarinen
Original Assignee
Upm Kymmene Oyj
Linde Gas Ag
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8561300&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=FI20011131(A7) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Upm Kymmene Oyj, Linde Gas Ag filed Critical Upm Kymmene Oyj
Priority to FI20011131A priority Critical patent/FI20011131L/en
Publication of FI20011131A0 publication Critical patent/FI20011131A0/en
Priority to AT02774036T priority patent/ATE423867T1/en
Priority to PCT/FI2002/000463 priority patent/WO2002097189A1/en
Priority to EP02774036A priority patent/EP1402111B1/en
Priority to DE60231303T priority patent/DE60231303D1/de
Publication of FI20011131A7 publication Critical patent/FI20011131A7/en
Publication of FI20011131L publication Critical patent/FI20011131L/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/01—Waste products, e.g. sludge

Landscapes

  • Paper (AREA)
  • Removal Of Specific Substances (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Esillä oleva keksintö liittyy menetelmään kiertovesien käsittelemiseksi paperin- tai massanvalmistusprosesseissa, jossa menetelmässä aikaansaadaan paperin- tai massanvalmistusprosessin selluloosamassan vesisuspensiosta erotettu prosessivesivirta, jolla mainitulla erotetulla prosessivedellä on korkea vapaiden kalsiumionien taso. Prosessiveden pH:ksi aikaansaadaan vähintään pH 9. Prosessiveteen viedään kaasumaista hiilidioksidia määrä, joka riittää saostamaan olennaisen osan kalsiumioneista kiinteäksi kalsiumkarbonaatiksi vedessä ja aikaansaamaan vapaiden kalsiumionien tason alenemisen vedessä. Kalsiumioneista puhdistettu prosessivesi palautetaan paperin- tai massanvalmistusprosessiin vähentämällä tai estämällä siten prosessissa kiertävien kalsiumionien akkumuloitumista.The present invention relates to a method for treating circulating waters in paper or pulp manufacturing processes, in which the method provides a process water stream separated from an aqueous suspension of cellulose pulp in a paper or pulp manufacturing process, said separated process water having a high level of free calcium ions. The pH of the process water is provided to be at least pH 9. An amount of gaseous carbon dioxide is introduced into the process water sufficient to precipitate a substantial portion of the calcium ions as solid calcium carbonate in the water and to cause a reduction in the level of free calcium ions in the water. The process water purified from calcium ions is returned to the paper or pulp manufacturing process, thereby reducing or preventing the accumulation of calcium ions circulating in the process.

FI20011131A 2001-05-30 2001-05-30 Recirculating water treatment method FI20011131L (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FI20011131A FI20011131L (en) 2001-05-30 2001-05-30 Recirculating water treatment method
AT02774036T ATE423867T1 (en) 2001-05-30 2002-05-30 TREATMENT PROCEDURE FOR CIRCUIT WATER
PCT/FI2002/000463 WO2002097189A1 (en) 2001-05-30 2002-05-30 A method for treating circulation waters
EP02774036A EP1402111B1 (en) 2001-05-30 2002-05-30 A method for treating circulation waters
DE60231303T DE60231303D1 (en) 2001-05-30 2002-05-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20011131A FI20011131L (en) 2001-05-30 2001-05-30 Recirculating water treatment method

Publications (3)

Publication Number Publication Date
FI20011131A0 FI20011131A0 (en) 2001-05-30
FI20011131A7 true FI20011131A7 (en) 2002-12-01
FI20011131L FI20011131L (en) 2002-12-01

Family

ID=8561300

Family Applications (1)

Application Number Title Priority Date Filing Date
FI20011131A FI20011131L (en) 2001-05-30 2001-05-30 Recirculating water treatment method

Country Status (5)

Country Link
EP (1) EP1402111B1 (en)
AT (1) ATE423867T1 (en)
DE (1) DE60231303D1 (en)
FI (1) FI20011131L (en)
WO (1) WO2002097189A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7056419B2 (en) 2002-09-30 2006-06-06 American Air Liquide, Inc. Methods for modifying electrical properties of papermaking compositions using carbon dioxide
CN100429161C (en) * 2005-11-29 2008-10-29 谢列兵 Water treatment process and tubular water treatment apparatus
EP1816259A1 (en) * 2006-02-07 2007-08-08 L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Use of carbon dioxide for pH control of the wet end section of a paper machine
DE102006034186A1 (en) * 2006-07-24 2008-01-31 Siemens Ag Equipment for papermaking, especially waste paper
FI20065727A0 (en) 2006-11-15 2006-11-15 Linde Ag A method for reducing sedimentation in the pulp and paper industry
FI20096259A0 (en) 2009-11-30 2009-11-30 Linde Ag METHOD AND SYSTEM FOR TREATMENT OF PROCESSED WATER
FI127995B (en) * 2012-12-21 2019-07-15 Upm Kymmene Corp Utilization of waste water and flue gas
GB201315092D0 (en) 2013-08-23 2013-10-09 T & L Process Technology Ltd Improved Process
FR3081861B1 (en) * 2018-06-05 2020-05-15 Air Liquide France Industrie METHOD OF TREATING AN ALKALI INDUSTRIAL EFFLUENT USING CO2
CN111573998B (en) * 2020-06-12 2023-07-11 浙江大学 Efficient anaerobic effluent degassing and decalcification system for waste paper and papermaking wastewater
WO2025146543A1 (en) 2024-01-03 2025-07-10 Hydrophis Uk Ltd Process for sequestration of carbon dioxide and minerals from industrial waste products

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10174979A (en) * 1996-12-18 1998-06-30 Hitachi Zosen Corp Wastewater treatment method and apparatus
SE511794C2 (en) * 1997-06-30 1999-11-29 Sunds Defibrator Ind Ab Ways to reduce the content of calcium in the liquid phase in a pulp suspension
SE9803384L (en) * 1998-03-02 1999-09-03 Kemira Kemi Ab Process for treating process water

Also Published As

Publication number Publication date
DE60231303D1 (en) 2009-04-09
EP1402111A1 (en) 2004-03-31
WO2002097189A1 (en) 2002-12-05
ATE423867T1 (en) 2009-03-15
FI20011131A0 (en) 2001-05-30
EP1402111B1 (en) 2009-02-25
FI20011131L (en) 2002-12-01

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Legal Events

Date Code Title Description
FD Application lapsed