AU678081B2 - Method of purifying waste water - Google Patents
Method of purifying waste water Download PDFInfo
- Publication number
- AU678081B2 AU678081B2 AU10368/95A AU1036895A AU678081B2 AU 678081 B2 AU678081 B2 AU 678081B2 AU 10368/95 A AU10368/95 A AU 10368/95A AU 1036895 A AU1036895 A AU 1036895A AU 678081 B2 AU678081 B2 AU 678081B2
- Authority
- AU
- Australia
- Prior art keywords
- steam
- waste water
- evaporator
- condensate
- supplied
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
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
-
- 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
- B01D5/0033—Other features
- B01D5/0054—General arrangements, e.g. flow sheets
-
- 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
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
Landscapes
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Description
I
WO 95/12549 PCT/SE94/00990 1 Method of purifying waste water This invention relates to a method of purifying and recovering waste water from a fiberboard manufacturing process.
At the manufacture of fiberboard according to the dry method, for example MDF (Medium Density Fiberboard), the starting material is lignocellulose-containing fiber material, for example wood chips which are washed, defibered, dried, glued, formed to a fiber mat and pressed in a hot press.
At this process a large amount of waste water is produced, which was separated from the fiber material, for example at chip washing, dewatering screw, gas scrubber a.o. This waste water contains impurities in the form of fiber fragments and other organic matter.
For purifying waste water, an evaporator can be used which concentrates the impurities by evaporation of the waste water. The impurities can thereafter be separated mechanically from the evaporator. The waste water thus purified partially could be re-used in the process, while a large proportion was emitted. The requirements on the purity of waste water have become increasingly severe and, therefore, the purification costs have increased and thereby have deteriorated the profitability of the entire fiberboard manufacturing process.
C
The present invention offers a solution of the aforesaid problem by using the contaminated waste water after purification for steam generation.
r la According to the present invention there is provided a method of purifying and recovering waste water from a fiberboard manufacturing process, where the waste water is supplied to an evaporator, in which steam from a steam generator is used as heating medium for evaporating the waste water and concentrating impurities, which thereafter are separated mechanically from the evaporator characterized in that the steam generated in the evaporator is used in a steam converter for restoring the heating medium used in the evaporator from condensate to steam phase, said steam phase being used as consumption steam in the process, that the condensate formed in the steam converter is purified in a purification unit from dissolved substances, whereafter the condensate thus purified is used as feed water in the steam generator, from which steam is supplied to the evaporator.
Preferably part of the steam generated in the steam generator is used directly as consumption steam in the process.
20 Preferably the supplied amount of waste water substantially corresponds to the demand of feed water for generating consumption steam in the process.
The invention is described in greater detail in the following, with reference to the accompanying Figure, which 25 by way of a flow chart illustrates an embodiment of the method according to the invention.
staft/uanikeeW10368.95.speci_1 3.3.97 i 1 -3 r i Irr I WO 95/12549 PCT/SE94/00990 2 Contaminated waste water from chip washing, press water from the feed screw to the defibering process and scrubber water from the fiber drier is fed through a supply line 10 to an evaporator 11. This eveporator is designed as a heat exchanger where heating medium in the form of steam of high pressure is directed in a counterflow. The steam used as heating medium is generated in a steam generator 12 and can have a pressure of 12-25 bar, suitably about 16 bar.
In the evaporator 11 the waste water is evaporated and at the same time the heating steam is condensed whereby the impurities are concentrated and mechanically separated. These impurities are discharged from the evaporator 11 through an outlet 13 in the form of a thickened sludge, the dry matter content of which is sufficient for yielding a positive heat value, which makes its combustion, for example in a roasting boiler, possible.
The waste water evaporated in the evaporator 11 is directed to a steam converter 14, which is designed as a heat exchanger where the evaporated waste water in a counterflow heats the condensate from the evaporator 11, so that it is restored to steam at the same time as the evaporated waste water is condensed. This condensed waste water, which still contains water-soluble impurities, is directed to a purification unit 15 where these solved substances are separated, for example by inverted osmosis. The waste water is purified by this treatment to such a quality, that it can be used as feed water in the steam generator 12.
The steam generated in the steam converter 14 is discharged through a line 16 for being used as consumption steam in the fiberboard manufacturing process. The steam pressure is slightly lower than the steam pressure from the steam generator 12. The outgoing steam pressure, thus, can be 10-20 bar. At a steam pressure of about 16 bar after the steam generator 12, the steam pressure after the steam converter can be about 12 bar. Part of the steam generated in the steam generator 12 is returned via a passageway 17 with a reducing valve 18 directly to the process, together with the steam I -O II I i ~II -I WO 95/12549 PCT/SE94/00990 3 in the line 16 generated in the steam converter 14.
The evaporator 11 as well as the steam converter 14 preferably are designed so that in operation contaminated heating surfaces are continuously cleaned mechanically.
.The waste water amounts obtained in the process which is supplied through the line 10, normally is of the same magnitude as the demand of feed water for generating steam in the steam generator 12. When the supplied amount of waste water substantially corresponds to the demand of feed water for generating consumption steam, in the entire system for purifying and recovering waste water balance is obtained.
The invention, of course, is not rot restricted to the embodiment described and shown, but can be varied within the scope of the invention idea.
I~
Claims (4)
1. A method of purifying and recovering waste water from a fiberboard manufacturing process, where the waste water is supplied to an evaporator, in which steam from a steam generator is used as heating medium for evapora.ting the waste water and concentrating impurities, which thereafter are separated mechanically from the evaporator characterized in that the steam generated in the evaporator is used in a steam converter for restoring the heating medium used in the evaporator from condensate to steam phase, said steam phase being used as consumption steam in the process, that the condensate formed in the steam converter is purified in a purification unit from dissolved substances, whereafter the condensate thus purified is used as feed water in the steam generator, from which steam is supplied to the evaporator.
2. A method as defined in claim 1, characterized in that part of the steam generated in the steam generator is used directly as consumption steam in the process. 20
3. A method as defined in claim 1 or 2, :characterized in that the supplied amount of waste water substantially corresponds to the demand of feed water for generating consumption steam in the process. aoo a. a staftuanikeep/10368.95.spec l 3.3.97 C" 1
4. A method of purifying and recovering waste water from a fibreboard manufacturing process substantially as herein described with reference to the accompanying drawings. DATED THIS 3RD DAY OF MARCH 1997. SUNDS DEFIBRATOR, INDUSTRIES AB By its Patent Attorneys: GRIFFITH HACK Fellows Institute of Patent 10 Attorneys of Australia V stafuanIkeeI1 0368.95.sped_1 3.3.97
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9303645 | 1993-11-05 | ||
| SE9303645A SE502916C2 (en) | 1993-11-05 | 1993-11-05 | Ways to purify and recycle wastewater from a fiberboard production process |
| PCT/SE1994/000990 WO1995012549A1 (en) | 1993-11-05 | 1994-10-20 | Method of purifying waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1036895A AU1036895A (en) | 1995-05-23 |
| AU678081B2 true AU678081B2 (en) | 1997-05-15 |
Family
ID=20391643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU10368/95A Expired - Fee Related AU678081B2 (en) | 1993-11-05 | 1994-10-20 | Method of purifying waste water |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0726879A1 (en) |
| JP (1) | JPH09504473A (en) |
| AU (1) | AU678081B2 (en) |
| CA (1) | CA2171838A1 (en) |
| FI (1) | FI961883A0 (en) |
| SE (1) | SE502916C2 (en) |
| WO (1) | WO1995012549A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI982737A (en) * | 1998-12-17 | 2000-06-18 | Valmet Corp | Process for producing paper and / or cardboard and for energy production, as well as a production process and an industrial plant applying the procedure |
| CN101851041B (en) * | 2010-04-27 | 2012-02-08 | 中国海诚工程科技股份有限公司 | Method and device for realizing zero release in desulfuration wastewater deepening treatment |
| CN111701265A (en) * | 2020-06-28 | 2020-09-25 | 宜宾丝丽雅股份有限公司 | Evaporation system and method for acid bath treatment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3242970A (en) * | 1963-03-06 | 1966-03-29 | Buckau Wolf Maschf R | Multiple-effect vertical-tube evaporator |
| WO1990013342A1 (en) * | 1989-05-10 | 1990-11-15 | Inventio Oy | Method of evaporating warm liquid |
| WO1993016004A1 (en) * | 1992-02-10 | 1993-08-19 | Adolf Schiestl | Thermal method for cleaning waste water |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3016406C2 (en) * | 1980-04-29 | 1985-11-28 | Fried. Krupp Gmbh, 4300 Essen | Multi-stage thermal material separation process with a combined vapor compressor and heat transformer to recover the heat contained in the vapors and a device for carrying out the process |
-
1993
- 1993-11-05 SE SE9303645A patent/SE502916C2/en not_active IP Right Cessation
-
1994
- 1994-10-20 CA CA 2171838 patent/CA2171838A1/en not_active Abandoned
- 1994-10-20 JP JP7513160A patent/JPH09504473A/en active Pending
- 1994-10-20 EP EP95900961A patent/EP0726879A1/en not_active Withdrawn
- 1994-10-20 WO PCT/SE1994/000990 patent/WO1995012549A1/en not_active Application Discontinuation
- 1994-10-20 AU AU10368/95A patent/AU678081B2/en not_active Expired - Fee Related
-
1996
- 1996-05-03 FI FI961883A patent/FI961883A0/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3242970A (en) * | 1963-03-06 | 1966-03-29 | Buckau Wolf Maschf R | Multiple-effect vertical-tube evaporator |
| WO1990013342A1 (en) * | 1989-05-10 | 1990-11-15 | Inventio Oy | Method of evaporating warm liquid |
| WO1993016004A1 (en) * | 1992-02-10 | 1993-08-19 | Adolf Schiestl | Thermal method for cleaning waste water |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1036895A (en) | 1995-05-23 |
| CA2171838A1 (en) | 1995-05-11 |
| FI961883A (en) | 1996-05-03 |
| JPH09504473A (en) | 1997-05-06 |
| FI961883A0 (en) | 1996-05-03 |
| SE9303645L (en) | 1995-05-06 |
| SE502916C2 (en) | 1996-02-19 |
| EP0726879A1 (en) | 1996-08-21 |
| WO1995012549A1 (en) | 1995-05-11 |
| SE9303645D0 (en) | 1993-11-05 |
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