CN101215797A - Zero discharge treatment method for chemical mechanical pulp - Google Patents
Zero discharge treatment method for chemical mechanical pulp Download PDFInfo
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- CN101215797A CN101215797A CNA2008100193545A CN200810019354A CN101215797A CN 101215797 A CN101215797 A CN 101215797A CN A2008100193545 A CNA2008100193545 A CN A2008100193545A CN 200810019354 A CN200810019354 A CN 200810019354A CN 101215797 A CN101215797 A CN 101215797A
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Abstract
The invention discloses a zero effluent method for handling chemico-mechanical pulp waste liquid, the method comprises pre-concentrating chemico-mechanical pulp waste liquid by adopting barrier separation, completely using permeate liquid A in the work section of pulping and recovering alkali, feeding filter liquor A in a multi-effect evaporation station, continuously stripping evaporating liquid B after filter liquor A is evaporated, completely recycling for pulping and causticizing scouring work section, recovering alkali in concentrated solution B. The invention can lower operation cost in maximum limit when alkali recovery technique is adopted by the invention to achieve zero effluent discharge of chemico-mechanical pulp, and the invention reduces one time investment and reuses water resource, which is completely in accordance with the prior national industry policy of energy saving, discharge reducing, and clean production.
Description
Technical field
The present invention relates to the pulping waste liquor comprehensive regulation, specifically chemical mechanical poslishing wood pulp waste liquor (hereinafter to be referred as changing the machine pulp waste) Zero discharge treatment method.
Background technology
Present both domestic and externalization machine pulp waste treatment process is divided into two kinds: one is biochemical process (a heavy pond/two sections active aerobic-anaerobic biological treatments), and its disadvantage is that COD (COD) total release is big, does not meet country and reduces discharging requirement.Another is zero-emission, i.e. alkali recycling, and its technology is: pulping waste liquor → multiple-effect evaporation station concentrates → alkali stove burning → caustic room → realization alkali recovery, and its disadvantage is that equipment investment is big, and the operating cost height does not meet national energy-conservation requirement.The many employings of zero-emission enterprise at present both at home and abroad will be changed and mix and handle with utilizing black pulp liquor (initial concentration is higher, calorific value is high) after the machine pulp waste is concentrated into finite concentration, but adopt this technology must guarantee that supporting chemical pulp factory is arranged nearby, moreover since chemical pulp and change machine slurry to add medicine different, reclaim for chemicals and also can exert an influence, put after also having some North America producers that waste liquid is carried out necessarily concentrating to virgin forest and carry out natural decomposition.
Find by analyzing: in the technique of zero discharge evaporation section, change machine pulp waste is concentrated to the energy consumption (comprising steam and electric power) that is consumed near 10% concentration from initial concentration (being generally 1%～2%) and accounts for 2/3 of whole energy consumptions, therefore adopt a kind of low power technology to substitute the evaporation FEOL, soon waste liquid is concentrated in advance after 10% and evaporates, not only total energy consumption can be reduced greatly, and the evaporation equipment investment can be reduced.
Summary of the invention
The purpose of this invention is to provide a kind of zero discharge treatment method for chemical mechanical pulp.Among the present invention, at first use film to separate enrichment machine pulp waste in advance, and then evaporate with alkali and reclaim, when realizing zero-emission, reduce operating cost to greatest extent, reuse totally sees through liquid A (clear water), reduce the disposable apparatus investment, meet the latest requirement of national energy-saving and emission-reduction.
The objective of the invention is to be achieved through the following technical solutions:
A kind of zero discharge treatment method for chemical mechanical pulp is characterized in that it may further comprise the steps:
1) adopts film to separate enrichment machine pulp waste in advance, obtain seeing through liquid A and filter liquor A; Wherein, see through liquid A and account for 80%, filter liquor A accounts for 20%.
2) with the above-mentioned liquid A complete-reclaiming that sees through in slurrying and alkali recycle section, filter liquor A sends into the multiple-effect evaporation station;
3) filter liquor A obtains evaporated liquor B and concentrate B behind pervaporation;
4) complete-reclaiming is in slurrying and causticization washing room after stripper plant is handled with above-mentioned evaporated liquor B, and concentrate B proceeds traditional alkali recycling.
The present invention is in step 1), and film separates and to comprise three continuous stages, promptly through phase I of laminated filter, through the second stage of ultrafiltration apparatus with through phase III of nanofiltration device.
Described laminated filter is removed bulky grain fibre suspension impurity, the colloidal impurity in the waste liquid; Ultrafiltration apparatus filters colloid, pigment and the suspended matter of diameter between 5 nanometer to 50 nanometers; Nanofiltration device is mainly removed the salt that dissolves in the water, removes the granule that surfactant, metal ion, mineral matter and last stage do not remove simultaneously.
Dispose of sewage from embrane method, existing black liquor is handled and is comprised three kinds of reverse osmosis membrane processing, nanofiltration membrane treatment, ultrafiltration membrane treatment, and they are different with the present invention.At first, membrane material aperture difference, the straw pulp black liquor separation only uses micro-filtration membrane a kind of, its aperture is between 0.1 micron to 100 microns, and the present invention is used in combination milipore filter and NF membrane, and the milipore filter aperture is between 5 nanometer to 50 nanometers, and the NF membrane aperture is between 0.5 nanometer to 5 nanometer.Secondly, separate object difference, straw pulp black liquor micro-filtration membrane are only applicable to waste liquid of straw pulp separates, and being applicable to of the present invention machine pulp waste is handled.Change machine pulp waste is a wood pulp waste liquor, its solid concentration (being generally 1%-2%) on the low side unusually, and COD also only has 15000-20000mg/l, and is different fully with the straw pulp black liquor characteristic.The 3rd, application target and subsequent technique difference, the main purpose that straw pulp black liquor adopts micro-filtration membrane to separate solves the high problem of silicone content exactly, separates back black liquor direct reuse in the cooking section of papermaking straw pulp.And the present invention carries out pre-concentration to changing the machine pulp waste, and concentrate is proceeded evaporation and alkali recycling, and final purpose is realizationization machine pulp waste zero-emission under low energy consumption, low investment prerequisite.
The present invention is in step 2) in, it is good through liquid A water quality that film separates, and meets slurrying and alkali recycle section water quality requirement fully.
The present invention is in step 3), and after evaporated liquor B handled by stripper plant, complete-reclaiming was in slurrying and causticization washing room.
The present invention is in step 4), and the subsequent treatment process of concentrate B is identical with ripe at present utilizing black pulp liquor alkali recycling.
Change machine pulp waste is because itself solid content is seriously on the low side, directly evaporation will cause energy consumption big, the present invention imports the film system earlier with it and carries out preliminary treatment, after having improved initial concentration, enter the multi-effect evaporator evaporation again, carry out follow-up alkali recovery process then, when realizing zero-emission, having saved to greatest extent can resource and recycle-water resource.
Compared with prior art, advantage of the present invention is:
1, one-time investment is few.On the low side because of the waste liquid solid content, it is bigger that traditional alkali reclaims the evaporation technology evaporator area, after the waste liquid pre-concentration several times, evaporator area only needs traditional about about 40%, and the evaporation equipment cost can reduce by 55% approximately, considers the investment of film system, after using the present invention, disposable gross investment reduces by 10% approximately.
2, the construction period is short.Because coming into operation of film system, evaporator area significantly reduces, and the evaporimeter construction duration will shorten about 15% (about three months), and the whole project duration is also with corresponding shortening.
3, operating cost is low.Owing to significantly reduced the evaporation steam consumption, energy-saving effect is obvious, and annual operating cost reduces by 10% approximately, meets national energy-conservation requirement.
4, zero-emission.Liquid waste processing is effective and reasonable, and processing procedure is realized zero-emission fully, meets country and reduces discharging requirement.
5, cleaner production.It is good to see through liquid A and evaporated liquor B water quality, and complete-reclaiming reclaims caustic room in slurrying and alkali, and the fresh clear water consumption of ton air dried pulp will be reduced to (even lower) about 3 tons by 10 tons, meet national cleaner production requirement.
Description of drawings
Accompanying drawing is a flow chart of the present invention.
The specific embodiment
A kind of zero discharge treatment method for chemical mechanical pulp of the present invention may further comprise the steps:
At first, adopt film to separate enrichment machine pulp waste in advance, obtain about 80% the filter liquor A that sees through liquid A and about 20%, see through liquid A complete-reclaiming in slurrying and alkali recycle section, filter liquor A sends into the multiple-effect evaporation station, behind pervaporation, obtains evaporated liquor B and concentrate B, complete-reclaiming is in slurrying and causticization washing room after stripper plant is handled for evaporated liquor B, and concentrate B proceeds traditional alkali recycling.
Preconcentration technique is divided into three grades of laminated filters, ultrafiltration apparatus, nanofiltration device.Laminated filter is mainly removed the normal large granular impurities that move of obstruction subsequent technique system such as suspended matter, colloid such as the fiber in the former waste liquid.The main task of ultrafiltration apparatus is to filter colloid, pigment and the suspended matter etc. of diameter between 5 nanometer to 50 nanometers.Nanofiltration device is mainly removed the salt that dissolves in the water, removes the granule that surfactant, metal ion, mineral matter and last stage do not remove simultaneously, and this device also comprises security personnel's filter, high-pressure pump, film system cleaning equipment etc.
The multiple-effect evaporation station comprises stripper plant one cover, and it utilizes the heating power principle, removes the dissolved gas impurity among the evaporated liquor B, guarantees that evaporated liquor B satisfies slurrying fully and the causticization washing room uses.
Concentrate B treatment process is identical with ripe at present utilizing black pulp liquor alkali recycling.
Claims (3)
1. zero discharge treatment method for chemical mechanical pulp is characterized in that it may further comprise the steps:
1) adopts film to separate enrichment machine pulp waste in advance, obtain seeing through liquid A and filter liquor A;
2) with the above-mentioned liquid A complete-reclaiming that sees through in slurrying and alkali recycle section, filter liquor A sends into the multiple-effect evaporation station;
3) filter liquor A obtains evaporated liquor B and concentrate B behind pervaporation;
4) complete-reclaiming is in slurrying and causticization washing room after stripper plant is handled with above-mentioned evaporated liquor B, and concentrate B proceeds traditional alkali recycling.
2. zero discharge treatment method for chemical mechanical pulp according to claim 1, it is characterized in that: in step 1), film separates pre-concentration and comprises three continuous stages, promptly through phase I of laminated filter, through the second stage of ultrafiltration apparatus with through phase III of nanofiltration device.
3. zero discharge treatment method for chemical mechanical pulp according to claim 2 is characterized in that: described laminated filter is removed bulky grain fibre suspension impurity, the colloidal impurity in the waste liquid; Ultrafiltration apparatus filters colloid, pigment and the suspended matter of diameter between 5 nanometer to 50 nanometers; Nanofiltration device is mainly removed the salt that dissolves in the water, removes the granule that surfactant, metal ion, mineral matter and last stage do not remove simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100193545A CN101215797B (en) | 2008-01-04 | 2008-01-04 | Zero discharge treatment method for chemical mechanical pulp |
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| CN2008100193545A CN101215797B (en) | 2008-01-04 | 2008-01-04 | Zero discharge treatment method for chemical mechanical pulp |
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| CN101215797A true CN101215797A (en) | 2008-07-09 |
| CN101215797B CN101215797B (en) | 2010-06-02 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230293A (en) * | 2011-06-02 | 2011-11-02 | 山东太阳纸业股份有限公司 | Evaporation pretreatment process method for alkaline peroxide mechanical pulp |
| CN102249436A (en) * | 2011-07-13 | 2011-11-23 | 浙江开创环保科技有限公司 | Method for concentrating CMP (chemi-mechanical pulp) waste liquid by using membrane process |
| CN102392381A (en) * | 2011-08-02 | 2012-03-28 | 华南理工大学 | Chemi-mechanical pulp waste liquid alkaline recycling pretreatment method |
| CN102758375A (en) * | 2012-07-31 | 2012-10-31 | 广西金桂浆纸业有限公司 | Pretreatment method of chemical-mechanical pulping effluent |
| CN103215838A (en) * | 2013-03-11 | 2013-07-24 | 中国地质大学（武汉） | Process of wood pulp papermaking black liquor resourceful treatment |
| CN104928963A (en) * | 2015-05-08 | 2015-09-23 | 白博 | Zero-discharge online high concentration extraction process for chemimechamical pulp pulping waste liquid |
| CN110878482A (en) * | 2019-12-09 | 2020-03-13 | 中冶纸业银河有限公司 | Method for treating high-concentration filtrate of chemi-mechanical pulp |
| CN112340910A (en) * | 2020-09-09 | 2021-02-09 | 诸暨市洛宏环保科技有限公司 | Industrial sewage treatment and recycling device and using method |
| CN114180782A (en) * | 2021-11-25 | 2022-03-15 | 中国制浆造纸研究院有限公司 | Method for treating waste liquor of pulping of moso bamboo chemi-mechanical pulp |
| CN115434178A (en) * | 2022-08-23 | 2022-12-06 | 天津科技大学 | Chemical alkali recovery treatment process for chemi-mechanical pulp waste liquid |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192996A (en) * | 1998-02-20 | 1998-09-16 | 许裕金 | Recovering of paper-making black liquor alkali and separating and using of lignin etc. solid products |
| CN1268807C (en) * | 2003-05-15 | 2006-08-09 | 凯能高科技工程（上海）有限公司 | Method for recovering alkali and organic substance from pomace and waste liquid |
-
2008
- 2008-01-04 CN CN2008100193545A patent/CN101215797B/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230293A (en) * | 2011-06-02 | 2011-11-02 | 山东太阳纸业股份有限公司 | Evaporation pretreatment process method for alkaline peroxide mechanical pulp |
| CN102249436A (en) * | 2011-07-13 | 2011-11-23 | 浙江开创环保科技有限公司 | Method for concentrating CMP (chemi-mechanical pulp) waste liquid by using membrane process |
| CN102392381A (en) * | 2011-08-02 | 2012-03-28 | 华南理工大学 | Chemi-mechanical pulp waste liquid alkaline recycling pretreatment method |
| CN102392381B (en) * | 2011-08-02 | 2013-09-25 | 华南理工大学 | Chemi-mechanical pulp waste liquid alkaline recycling pretreatment method |
| CN102758375A (en) * | 2012-07-31 | 2012-10-31 | 广西金桂浆纸业有限公司 | Pretreatment method of chemical-mechanical pulping effluent |
| CN103215838B (en) * | 2013-03-11 | 2016-02-03 | 中国地质大学（武汉） | A kind of technique to the process of wood pulp papermaking black liquor and development as resource |
| CN103215838A (en) * | 2013-03-11 | 2013-07-24 | 中国地质大学（武汉） | Process of wood pulp papermaking black liquor resourceful treatment |
| CN104928963A (en) * | 2015-05-08 | 2015-09-23 | 白博 | Zero-discharge online high concentration extraction process for chemimechamical pulp pulping waste liquid |
| CN110878482A (en) * | 2019-12-09 | 2020-03-13 | 中冶纸业银河有限公司 | Method for treating high-concentration filtrate of chemi-mechanical pulp |
| CN112340910A (en) * | 2020-09-09 | 2021-02-09 | 诸暨市洛宏环保科技有限公司 | Industrial sewage treatment and recycling device and using method |
| CN114180782A (en) * | 2021-11-25 | 2022-03-15 | 中国制浆造纸研究院有限公司 | Method for treating waste liquor of pulping of moso bamboo chemi-mechanical pulp |
| CN115434178A (en) * | 2022-08-23 | 2022-12-06 | 天津科技大学 | Chemical alkali recovery treatment process for chemi-mechanical pulp waste liquid |
| CN115434178B (en) * | 2022-08-23 | 2023-09-01 | 天津科技大学 | Chemical alkali recovery treatment process for chemical mechanical pulp waste liquid |
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| Publication number | Publication date |
|---|---|
| CN101215797B (en) | 2010-06-02 |
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