SE500052C2 - Treatment of process water to remove metal ions - by bringing the process water into contact with pulp not intended for bleaching by hydroperoxide or ozone - Google Patents
Treatment of process water to remove metal ions - by bringing the process water into contact with pulp not intended for bleaching by hydroperoxide or ozoneInfo
- Publication number
- SE500052C2 SE500052C2 SE9202464A SE9202464A SE500052C2 SE 500052 C2 SE500052 C2 SE 500052C2 SE 9202464 A SE9202464 A SE 9202464A SE 9202464 A SE9202464 A SE 9202464A SE 500052 C2 SE500052 C2 SE 500052C2
- Authority
- SE
- Sweden
- Prior art keywords
- pulp
- process water
- bleaching
- ozone
- treatment
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000004061 bleaching Methods 0.000 title claims abstract description 16
- 229910021645 metal ion Inorganic materials 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 14
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 11
- 239000002351 wastewater Substances 0.000 claims abstract description 7
- 239000008139 complexing agent Substances 0.000 claims description 2
- 239000012978 lignocellulosic material Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 7
- 229910052748 manganese Inorganic materials 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
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
- D21C9/1042—Use of chelating agents
-
- 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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
- D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
-
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Description
2 Oblekt massa tillföres genom en ledning 1 till ett förbehandlingssteg 2 där massan behandlas med komplexbildare av typ EDTA eller DTPA. Metaller såsom mangan löses där ut ur fibermaterialet. Därifrån förs massan till ett första tvättsteg 3, företrädesvis i form av en tvättpress, där avloppsvatten innehållande de kritiska metalljonerna dras av genom en ledning 4. Den från kritiska metalljoner befriade massan förs till ett bleksteg 5 för blekning med väteperoxid eller ozon. Efter blek- steget 5 förs massan till ett andra tvättsteg 6 där avloppsvatt- net från det första tvâttsteget 3 via ledningen 4 äter bringas i kontakt med massan och där massan ånyo binder de ursprungliga metalljonerna. Avloppsvattnet från det andra tvâttsteget avleds genom en ledning 7 och den tvättade massan tas ut genom en ledning 8. Det från metalljoner befriade avloppsvattnet kan áterföras till tidigare steg i processen. Unbleached pulp is supplied through a line 1 to a pretreatment step 2 where the pulp is treated with complexing agents of the EDTA or DTPA type. Metals such as manganese are dissolved there from the fibrous material. From there the pulp is passed to a first washing step 3, preferably in the form of a washing press, where wastewater containing the critical metal ions is drawn off through a line 4. The pulp freed from critical metal ions is passed to a bleaching step 5 for bleaching with hydrogen peroxide or ozone. After the bleaching step 5, the pulp is taken to a second washing step 6 where the waste water from the first washing step 3 via the line 4 eats is brought into contact with the pulp and where the pulp again binds the original metal ions. The wastewater from the second washing stage is diverted through a line 7 and the washed mass is taken out through a line 8. The wastewater freed from metal ions can be returned to earlier stages in the process.
Massan kommer således att transportera metallerna ut ur blekeriet och ackumulationseffekten i blekeriet kan därmed undvikas vid slutning av avloppssystemet.The pulp will thus transport the metals out of the bleaching plant and the accumulation effect in the bleaching plant can thus be avoided when closing the drainage system.
Det har visat sig att lämpliga betingelser för att uppnå en god eliminering av metalljonerna i det andra tvâttsteget 6 skall vara pH över 7, företrädesvis pH 11 eller högre och en temperatur av 50-120°C, företrädesvis 70-100°C. Tiden som pro- cessvattnet och massan skall vara i kontakt med varandra bör vara 0,1-60 minuter, företrädesvis 1-5 minuter.It has been found that suitable conditions for achieving a good elimination of the metal ions in the second washing step 6 should be pH above 7, preferably pH 11 or higher and a temperature of 50-120 ° C, preferably 70-100 ° C. The time that the process water and the pulp should be in contact with each other should be 0.1-60 minutes, preferably 1-5 minutes.
Ett alternativt förfaringssätt är att enbart en delström av massan utnyttjas för att avskilja metalljonerna från avlopps- vattnet från det första tvâttsteget. Det är naturligtvis även möjligt att använda en oblekt massa som inte skall blekas eller ett rejektmassaflöde för att avskilja metalljonerna.An alternative method is that only a partial stream of the pulp is used to separate the metal ions from the wastewater from the first washing step. Of course, it is also possible to use an unbleached pulp that is not to be bleached or a reject pulp stream to separate the metal ions.
Vidare är det också tänkbart att utnyttja metallavskilj- ningen enligt uppfinningen som komplement till annan typ av avskiljning av metaller.Furthermore, it is also conceivable to use the metal separation according to the invention as a complement to another type of metal separation.
Exempel 1 Manganhalten i en ligninfri vattenlösning som behandlades med väteperoxidblekt massa visade sig minska betydligt när behandlingen gjordes vid pH 12 jämfört med pH 10-11. Behandling under 10 min vid 80°C. 3 Vätska 1 Initial halt (mg/1) 6,5 Behandling vid pH 10 6,4 Behandling vid pH ll 6,5 Behandling vid pH 12 1,2 Exempel 2 Manganhalten uppmättes i ett laboratorietillverkat blekeriavlopp efter behandling med väteperoxidblekt massa.Example 1 The manganese content of a lignin-free aqueous solution treated with hydrogen peroxide bleached pulp was found to decrease significantly when the treatment was done at pH 12 compared to pH 10-11. Treatment for 10 minutes at 80 ° C. 3 Liquid 1 Initial content (mg / l) 6.5 Treatment at pH 6.4 Treatment at pH 11 6.5 Treatment at pH 12 1.2 Example 2 The manganese content was measured in a laboratory-made bleaching effluent after treatment with hydrogen peroxide bleached pulp.
Behandlingen gjordes vid olika pH. Vid pH 12 och i tvâ fall även vid pH 11, noteras en kraftig reduktion av manganhalten.The treatment was done at different pH. At pH 12 and in two cases also at pH 11, a sharp reduction in the manganese content is noted.
Vätska 2 Vätska 3 Vätska 4 Initial halt (mg/1) 3,3 3,5 3,6 Behandling vid pH 10 - - 3,4 Behandling vid pH 11 0,7 resp 0,4 2,7 0,3 Behandling vid pH 12 - 1,3 0,03 Exempel 3 Manganhalten uppmättes i ett laboratorietillverkat blekeriavlopp efter behandling med väteperoxidblekt massa där behandlingen gjordes vid olika pH och temperatur. Resultaten visar att behandlingstider över 2 minuter ej inverkar nämnvärt pä resultatet. Ökat pH tycks också vara viktigare än ökad tempe- ratur.Liquid 2 Liquid 3 Liquid 4 Initial content (mg / l) 3.3 3.5 3.6 Treatment at pH 10 - - 3.4 Treatment at pH 11 0.7 and 0.4 2.7 0.3 Treatment at pH 12 - 1.3 0.03 Example 3 The manganese content was measured in a laboratory-produced bleaching effluent after treatment with hydrogen peroxide bleached pulp where the treatment was carried out at different pH and temperature. The results show that treatment times over 2 minutes do not significantly affect the result. Increased pH also seems to be more important than increased temperature.
H11 80°§ H12 80°_C_ H11 90°Q Initial halt (mg/l) 3,5 3,5 3,5 Behandlingstid 2 min 2,3 1,9 2,6 Behandlingstid 10 min 2,6 1,3 2,5 Behandlingstid 60 min - - 2,3 .f Vï -\ _.- CD CÜ U1 BO I-h Exempel 4 Manganhalten uppmättes i laboratorietillverkade blekeri- avlopp frán vâteperoxidblekning av massor med olika ligninhalt.H11 80 ° § H12 80 ° _C_ H11 90 ° Q Initial content (mg / l) 3.5 3.5 3.5 Treatment time 2 min 2.3 1.9 2.6 Treatment time 10 min 2.6 1.3 2 Treatment time 60 min - - 2,3 .f Vï - \ _.- CD CÜ U1 BO Ih Example 4 The manganese content was measured in laboratory-produced bleaching effluents from wet peroxide bleaching of pulps with different lignin contents.
Behandling under 10 minuter vid 80%L Massans ligninhalt uppmätt som kappatal har ingen avgörande inverkan på uppnàdd manganhalt.Treatment for 10 minutes at 80% L The lignin content of the pulp measured as kappa has no decisive effect on the manganese content reached.
Massa 1 Massa 2 (kappatal 5) (kappatal 9) Initialhalt (mg/1) 3,6 3,6 Behandling vid pH 10 3,4 - Behandling vid pH 11 0,3 1,1 Behandling vid pH 12 0,03 <0,01 Uppfinningen är givetvis inte begränsad av dessa utför- ingsformer utan kan varieras inom ramen för uppfinningstanken.Mass 1 Mass 2 (kappa number 5) (kappa number 9) Initial content (mg / l) 3.6 3.6 Treatment at pH 10 3.4 - Treatment at pH 11 0.3 1.1 Treatment at pH 12 0.03 < 0.01 The invention is of course not limited by these embodiments but can be varied within the scope of the inventive concept.
Claims (5)
Priority Applications (17)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9202464A SE500052C2 (en) | 1992-08-28 | 1992-08-28 | Treatment of process water to remove metal ions - by bringing the process water into contact with pulp not intended for bleaching by hydroperoxide or ozone |
SE9301160A SE9301160L (en) | 1992-08-28 | 1993-04-07 | Process for treating process water |
ZA935691A ZA935691B (en) | 1992-08-28 | 1993-08-05 | Method of treating process water. |
CA002139566A CA2139566A1 (en) | 1992-08-28 | 1993-08-11 | Method of treating process water |
BR9306963A BR9306963A (en) | 1992-08-28 | 1993-08-11 | Process water treatment method |
DE69309938T DE69309938T2 (en) | 1992-08-28 | 1993-08-11 | METHOD FOR TREATING WASTEWATER |
JP6507102A JPH08500645A (en) | 1992-08-28 | 1993-08-11 | Process water treatment method |
PCT/SE1993/000660 WO1994005850A1 (en) | 1992-08-28 | 1993-08-11 | Method of treating process water |
AT93919744T ATE151825T1 (en) | 1992-08-28 | 1993-08-11 | METHOD FOR TREATING WASTEWATER |
AU49879/93A AU665461B2 (en) | 1992-08-28 | 1993-08-11 | Method of treating process water |
NZ255613A NZ255613A (en) | 1992-08-28 | 1993-08-11 | Treating process water to remove metal ions; contacting with lignocellulose pulp which is not to be bleached |
ES93919744T ES2100563T3 (en) | 1992-08-28 | 1993-08-11 | METHOD OF TREATING WASTEWATER FROM THE PAPER INDUSTRY. |
EP93919744A EP0656966B1 (en) | 1992-08-28 | 1993-08-11 | Method of treating process water |
CN93116508A CN1089578A (en) | 1992-08-28 | 1993-08-19 | The method of process for producing water |
NO950752A NO301724B1 (en) | 1992-08-28 | 1995-02-27 | Process water treatment process |
FI950882A FI950882A0 (en) | 1992-08-28 | 1995-02-27 | Method for treating process water |
US08/779,255 US5741398A (en) | 1992-08-28 | 1997-01-03 | Method of removing metal ions dissolved in the bleach plant waste water |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9202464A SE500052C2 (en) | 1992-08-28 | 1992-08-28 | Treatment of process water to remove metal ions - by bringing the process water into contact with pulp not intended for bleaching by hydroperoxide or ozone |
Publications (3)
Publication Number | Publication Date |
---|---|
SE9202464D0 SE9202464D0 (en) | 1992-08-28 |
SE9202464L SE9202464L (en) | 1994-03-01 |
SE500052C2 true SE500052C2 (en) | 1994-03-28 |
Family
ID=20387024
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9202464A SE500052C2 (en) | 1992-08-28 | 1992-08-28 | Treatment of process water to remove metal ions - by bringing the process water into contact with pulp not intended for bleaching by hydroperoxide or ozone |
Country Status (2)
Country | Link |
---|---|
SE (1) | SE500052C2 (en) |
ZA (1) | ZA935691B (en) |
-
1992
- 1992-08-28 SE SE9202464A patent/SE500052C2/en unknown
-
1993
- 1993-08-05 ZA ZA935691A patent/ZA935691B/en unknown
Also Published As
Publication number | Publication date |
---|---|
ZA935691B (en) | 1994-03-03 |
SE9202464D0 (en) | 1992-08-28 |
SE9202464L (en) | 1994-03-01 |
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