WO2001041991A1 - A purification method - Google Patents
A purification method Download PDFInfo
- Publication number
- WO2001041991A1 WO2001041991A1 PCT/SE2000/002457 SE0002457W WO0141991A1 WO 2001041991 A1 WO2001041991 A1 WO 2001041991A1 SE 0002457 W SE0002457 W SE 0002457W WO 0141991 A1 WO0141991 A1 WO 0141991A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wood
- chips
- plant
- water
- room
- Prior art date
Links
- 238000000746 purification Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002023 wood Substances 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000000356 contaminant Substances 0.000 description 3
- 229920002522 Wood fibre Polymers 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/023—Cleaning wood chips or other raw materials
Definitions
- a PURI ⁇ CA ⁇ ON METHOD The present invention relates to a method for the cleaning of water, for example, excess water from a wood room in a forestry plant for the production of paper pulp.
- a wood room forms part of the said forestry plant, in which forestry raw material is debarked in a debarking drum and then washed or de-iced with the aid of water that circulates in the wood room.
- the current invention thus aims at solving this problem and offering an environmentally friendly solution to the problem.
- the drawing shows a wood room 1, a chipper 2, a digester house 3 and an washing function 4 that is an existing part of the forestry plant.
- wood is debarked and washed in the wood room 1.
- the wood is transferred from the wood room to a chipper 2, in which the wood is chopped into small pieces.
- This chopped-up wood is transferred to a digester house 3, where the wood ⁇ s ⁇ boiled in ⁇ hite liquor whereby the fibres ⁇ Tthe wo ⁇ d are released and most of the ligniniir the wood is dissolved.
- the wood fibres released are transferred onwards in the process for bleaching, washing and drying, whereby the paper pulp is formed.
- the used white liquor containing contaminants known as weak liquor
- weak liquor is transferred together with lignin to a purification function that exists in the plant, which makes purification of the weak liquor possible.
- the problem with current forestry plants is that dirty water that has been used in the wood room is released to the environment.
- dirty excess water is led via a channel 5 from the wood room to the chipper, where the dirty water covers the wood that has been chopped up into small pieces such as wood chips or similar. Since wood in the form of chips has a surface area that is many times larger than the area that wood in the form of logs has, it is possible for the chips to absorb and carry all of the wood room water that arrived at the chipper.
- the dirty wood room effluent is then transferred, carried by chips, further in the plant via a digester to the purification function of the plant, and it can in this way be efficiently cleaned.
- Purification of wood room effluent thus occurs with the aid of the normal equipment in the forestry plant, which means that the purification process will be both efficient and cheap. Another advantage is the possibility of returning to the process the energy that is in the contaminants in the wood room effluent.
- the dirty water is injected from the wood room into the chipper. It is possible, of course, to inject this water at other locations in the forestry plant. The important point is that a collaboration takes place between the wood room water and the wood that has been chopped into chips, such that the chips can absorb and carry the wood room effluent onwards in the system such that the water can be cleaned in the purification function of the plant.
- dirty wood room effluent to be injected over the wood that has been chopped into chips in the transport means between the chipper and the digester, or at the actual storage place for the chips.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The present invention concerns a method for the purification of water, for example, excess water from a wood room in a forestry plant for the production of paper pulp, whereby the base raw material, wood, is chopped into small pieces, for example, chips, and whereby the forestry plant comprises a purification function that exists in the plant. According to the invention, the method is characterised by the following steps: the dirty wood room effluent is led from the washer and is returned to the plant in such a manner that a collaboration occurs with the wood that has been chopped into chips, such that the pieces of chips absorb and carry the wood room water; the wood room effluent, carried by the chips, is carried onwards into the process and reaches the purification function of the plant, which makes purification of the wood room effluent possible.
Description
A PURIΠCAΠON METHOD The present invention relates to a method for the cleaning of water, for example, excess water from a wood room in a forestry plant for the production of paper pulp.
As has been mentioned, a wood room forms part of the said forestry plant, in which forestry raw material is debarked in a debarking drum and then washed or de-iced with the aid of water that circulates in the wood room.
Using current technology, a relatively large amount of contaminated water is released from the wood room, which as a rule is led to large aerated ponds, in which the major part of the sedimentable material is separated out, while the water and the contaminants that are dissolved in the water give rise to a discharge from the factory. This is naturally undesirable, and in a longer perspective it is also unacceptable.
The current invention thus aims at solving this problem and offering an environmentally friendly solution to the problem.
This has been made possible by the method according to the invention demonstrating the steps specified in the claims. The method will be described in more detail below with reference to the schematic drawing, which shows four principle parts that are part of a forestry plant.
Thus the drawing shows a wood room 1, a chipper 2, a digester house 3 and an washing function 4 that is an existing part of the forestry plant.
As has been previously mentioned, wood is debarked and washed in the wood room 1. The wood is transferred from the wood room to a chipper 2, in which the wood is chopped into small pieces. This chopped-up wood is transferred to a digester house 3, where the wood ϊs~boiled in^ hite liquor whereby the fibres όTthe woόd are released and most of the ligniniir the wood is dissolved.
The wood fibres released are transferred onwards in the process for bleaching, washing and drying, whereby the paper pulp is formed.
The used white liquor containing contaminants, known as weak liquor, is transferred together with lignin to a purification function that exists in the plant, which makes purification of the weak liquor possible.
As has been previously mentioned, the problem with current forestry plants is that dirty water that has been used in the wood room is released to the environment. According to the invention, dirty excess water is led via a channel 5 from the wood room to the chipper, where the dirty water covers the wood that has been chopped up into small pieces such as wood chips or similar. Since wood in the form of chips has a surface area that is many times
larger than the area that wood in the form of logs has, it is possible for the chips to absorb and carry all of the wood room water that arrived at the chipper.
According to the invention, the dirty wood room effluent is then transferred, carried by chips, further in the plant via a digester to the purification function of the plant, and it can in this way be efficiently cleaned.
Purification of wood room effluent according to this invention thus occurs with the aid of the normal equipment in the forestry plant, which means that the purification process will be both efficient and cheap. Another advantage is the possibility of returning to the process the energy that is in the contaminants in the wood room effluent. According to the showed embodiment, the dirty water is injected from the wood room into the chipper. It is possible, of course, to inject this water at other locations in the forestry plant. The important point is that a collaboration takes place between the wood room water and the wood that has been chopped into chips, such that the chips can absorb and carry the wood room effluent onwards in the system such that the water can be cleaned in the purification function of the plant.
Thus it would be one alternative for the dirty wood room effluent to be injected over the wood that has been chopped into chips in the transport means between the chipper and the digester, or at the actual storage place for the chips.
Other modifications of the invention would, of course, be possible within the scope of the claims given below.
Claims
1. A method for the purification of water, for example, excess water from a wood room in a forestry plant for the production of paper pulp, whereby the base raw material, wood, is chopped into small pieces, for example, chips, and whereby the forestry plant comprises a purification function that exists in the plant, characterised by the following steps:
- The dirty wood room effluent is led from the wood room and is returned to the plant in such a manner that a collaboration occurs with the wood that has been chopped into chips, such that the pieces of chips absorb and carry the wood room water; - The wood room effluent, carried by the chips, is carried onwards into the process and reaches the purification function of the plant, which makes purification of the washing water possible.
2. The method according to claim 1, whereby the forestry industry plant comprises a chipper, characterised in that the water from the wood room is fed into the chipper, whereby the collaboration occurs there between the water and the wood that has been chopped into chips.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU22426/01A AU2242601A (en) | 1999-12-13 | 2000-12-07 | A purification method |
| SE0201634A SE0201634D0 (en) | 1999-12-13 | 2002-05-31 | Method of purifying water |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9904542-9 | 1999-12-13 | ||
| SE9904542A SE9904542D0 (en) | 1999-12-13 | 1999-12-13 | purification Method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2001041991A1 true WO2001041991A1 (en) | 2001-06-14 |
Family
ID=20418093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE2000/002457 WO2001041991A1 (en) | 1999-12-13 | 2000-12-07 | A purification method |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU2242601A (en) |
| SE (1) | SE9904542D0 (en) |
| WO (1) | WO2001041991A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4673013A (en) * | 1984-03-07 | 1987-06-16 | Saalasti Timo T | Woodroom effluent treatment system |
| JPH07144198A (en) * | 1993-11-26 | 1995-06-06 | Kiichiro Sarui | Fine wooden piece processed to have liquid stagnating property and treatment of waste water by using such fine piece |
-
1999
- 1999-12-13 SE SE9904542A patent/SE9904542D0/en unknown
-
2000
- 2000-12-07 AU AU22426/01A patent/AU2242601A/en not_active Abandoned
- 2000-12-07 WO PCT/SE2000/002457 patent/WO2001041991A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4673013A (en) * | 1984-03-07 | 1987-06-16 | Saalasti Timo T | Woodroom effluent treatment system |
| JPH07144198A (en) * | 1993-11-26 | 1995-06-06 | Kiichiro Sarui | Fine wooden piece processed to have liquid stagnating property and treatment of waste water by using such fine piece |
Non-Patent Citations (1)
| Title |
|---|
| DATABASE WPI Week 199531, Derwent World Patents Index; AN 1995-236558 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2242601A (en) | 2001-06-18 |
| SE9904542D0 (en) | 1999-12-13 |
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