CN102351364A - Treatment method of wood chip washing waste water - Google Patents
Treatment method of wood chip washing waste water Download PDFInfo
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- CN102351364A CN102351364A CN2011102590531A CN201110259053A CN102351364A CN 102351364 A CN102351364 A CN 102351364A CN 2011102590531 A CN2011102590531 A CN 2011102590531A CN 201110259053 A CN201110259053 A CN 201110259053A CN 102351364 A CN102351364 A CN 102351364A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
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Abstract
The invention relates to a treatment method of wood chip washing waste water, belonging to the field of pulping and paper making. By using the treatment method, wastes in wood chip washing water can be eliminated according to the classification and efficiently utilized in terms of the source, thereby solving the pollution problems of the wood chip washing waste water. The treatment method comprises the following steps: separating out gravels and other large-specific-gravity substances from wood chip washing waste water containing sands, barks, small wood flour, wood dust, other impurities and soluble substances comprising complicated components through a gravity settling basin, and safely landfilling; separating the barks, wood flour and wood dust through a disk filter, and incinerating to utilize the calorific capacity; further using one part of the treated liquid for wood chip washing, and separating out the soluble substances in one part of the treated liquid through an ultrafiltration membrane system; and further using the permeate liquid for wood chip washing, and further thickening the concentrated liquid for incineration. On the premise of ensuring the wood chip washing, the method improves the water circulation and recycling rate, reduces the consumption of fresh water during the wood chip washing, reduces the discharge amount of the waste water and eliminates the pollution of the wood chip washing water.
Description
Technical field
The present invention relates to a kind of treatment process of wood chip washes, particularly a kind of treatment process of paper industry pulping wood process wood chip washes.
Background technology
Along with the propelling of industry restructuring and " woods paper is integrated " engineering construction, China's pulping wood has obtained development faster.According to the statistics made by the departments concerned, the production capacity of China's self-control wood pulp in 2010 reaches more than 700 ten thousand t, and along with the integrated project implementation of a collection of woods paper successively newly-built and enlarging, the production capacity of wood pulp also will further promote.Pulp and paper industry is that water pollutes one of comparatively serious industry; Pulping wood is an important component part of pulp and paper industry; The consumption of China's pulp industry wood chip will be about 1,200 ten thousand t at present; The wood chip washing is the flow process of an indispensability in pulping process, and washes also is one of source of pollution of discharge of wastewater.The wood chip washing water yield depends on the concentration (usually adopt 4%～6%) of wood chip in washing machine in the pulping wood process, and corresponding water consumption is about 24～14m
3/ t wood chip, the COD of waste water
CrReach 1200～2500mg/L, BOD
5Reach 350～600mg/L, SS reaches 1000～1500mg/L, and the pH value is 6.2～6.5, and colourity is 500～800 times.The systematic study conclusion is: 1) water yield of wood chip washing water is big relatively; But Pollutant levels wherein are not very high; And the water quality requirement to the wood chip bath water neither be too high in the production technique, and impurity such as the silt particle in the need removal waste water, bark, tiny wood chip just can be used to wash the wood chip operation once more; Simultaneously, the dissolved matter in the washing water should not be too high, and the wood chip washing water can cyclically utilizing, but need remove dissolved matter wherein after being recycled to a certain degree, otherwise can influence the detersive efficiency of wood chip.2) waste water mainly contains little proportion suspended substance, big proportion suspended substance and dissolved matter.Little proportion suspended substance is mainly by bark, wood chip and fibrous; Big proportion suspended substance silt particle and dust are formed, and dissolved matter is mainly generated the materials such as tannin of carbohydrate and acid and bark stripping by clay particulate, tiny wood chip, wooden dust, hydrolysis of hemicellulose.If, can not influence follow-up effective utilization and treatment and disposal, and have potential secondary pollution problem to the separation of classifying of these materials.3) adopt the traditional water treatment technology to realize that there is difficulty in qualified discharge.COD
CrHigher and BOD
5/ COD
CrLower, belong to high density, waste water difficult for biological degradation, and complicated component in the waste water, and have more intense bio-toxicity; In addition, the water quality slant acidity at the front end of waste water treatment process, generally will be mixed the pH value of regulating waste water with meta-alkalescence slurrying middle-stage wastewater in even matter pond, is beneficial to follow-up biological treatment.Two stage biological processing with general is difficult to reach emission standard.
At present, carry out the research of wood chip washes also lessly relatively separately, particularly inquire into its Processing Technology still less, normally the wood chip washing water are mixed with paper-making effluent and carry out biochemical treatment at paper industry.But exist the wood chip washing water that water treatment system is produced the interferential problem, and then influence normal water treatment effect, simultaneously, after biochemical treatment, also have a certain amount of biochemical sludge emission problem.
Summary of the invention
The present invention provides a kind of paper industry wood chip method for processing wash water.To the numerous dissolved matters that contain impurity such as silt particle, bark, tiny wood chip, wooden dust and complicated component in the wood chip washes, the characteristics that the suspended sediment concentration of waste water is higher.Adopt gravity settling, filtration and film separating system to impurity dissimilar in the wood chip washing water removals of classifying, and the material after the separation is rationally handled and utilized.When guaranteeing the wood chip washing, improve the cyclically utilizing rate of waste water, reduce the fresh water usage quantity of wood chip washing, reduce the quantity discharged of washes, eliminate the pollution problem of wood chip washes.
For realizing above-mentioned purpose, concrete solution of the present invention is:
(1) separation and the processing of big proportion suspended substance in the wood chip washes
Send gravity settling basin to handle the wood chip washes, utilize the great inorganics of sandstone dust geometric ratio in the proportion official post wood chip washes to precipitate and obtain separating, the gained throw out carries out security landfill, and the gained supernatant liquid gets into next step.
(2) separation and the processing of the medium and small proportion suspended substance of wood chip washes
To handle removal through step (1) send disk filter to filter the organic substances of removing wherein such as bark, tiny wood chip and wooden dust than the waste water of heavy seeds greatly.Said filter filter screen mesh is greater than 150 orders.The organism that filters out send biomass boiler to burn generation heat energy, eliminates the pollution of this part organic waste simultaneously.
(3) separation and the processing of dissolved matter in the wood chip washes
After handled step (1) and (2), the suspended substance in the wood chip washes was removed basically, the remaining dissolved matter that is mainly, and this water can be used for the wood chip washing.But along with the increase of washing water cycle index, solute in the waste water can constantly increase, and can hinder the continuation stripping of wood chip surface dust after running up to a certain degree, and then influence the detersive efficiency of wood chip.For this reason, make the waste water direct reuse of handling back 60%～70% through step (1) and (2) among the present invention, remain 30%～40% waste water film feeding separation system and handle, make to be partly dissolved material and from system, to separate in time in the washing of wood chip.Selecting 30%～40% waste water to get into film separating system is to have taken all factors into consideration that solute is removed and the result of economy, behind membrane sepn, sees through liquid COD
CrConcentration is lower than 300mg/L, can be back to use the wood chip washing process fully.Said film separating system is that 500～10000 dalton's ultra-filtration membrane separating units are formed by the aperture.The solid concentration of concentrated solution reaches about 5%, send vapo(u)rization system to continue to be concentrated to more than 50% then and burns.
The invention has the beneficial effects as follows:
1. stable wood chip washing effect; In the wood chip washing process, adopt the present invention; Big proportion suspended substance, little proportion suspended substance and dissolved matter in the wood chip washes are carried out classification removed, in washing process, kept the digestion series balance, guaranteed the stable of washing back chip quality.2. through wastewater treatment cyclically utilizing of the present invention, effectively reduce the fresh water consumption of wood chip washing, reduce the quantity discharged of wood chip washes.3. realize from the source that waste sorting is subdued and efficiently utilization.Inorganicss such as sandstone are carried out security landfill handle, organism such as bark wood chip are carried out Biomass Energy Utilization, and dissolved matter is separated through film separating system, utilize organic substance heat production wherein through concentrating to burn.
Description of drawings
Fig. 1 is a process flow sheet of the present invention
Embodiment
Further specify characteristics of the present invention through concrete instance below.
Embodiment 1
Certain pulping wood factory adopts the outsourcing wood chip to carry out slurrying, the concentration 5% of wood chip in washing machine, and corresponding water consumption is about 19m
3/ t wood chip, the COD of waste water
CrConcentration is 1800mg/L, BOD
5Concentration is 500mg/L, and SS concentration is 1100mg/L, and the pH value is that 6.4 colourities are 660 times, and water temperature is 28 ℃.
(1) above-mentioned wood chip washes is sent gravity settling basin handle, big proportion inorganics such as sandstone dust wherein obtains separating through deposition.And inorganics security landfill to separating.
(2) will send the filter screen mesh through the big waste water than heavy seeds of step (1) processing removal is that 180 purpose disk filters filter the organic substances of removing wherein such as bark, tiny wood chip and wooden dust.The organism that screening is come out send donkey boiler to burn generation heat energy, eliminates the pollution of this part organic waste simultaneously.
(3) after handle step (1) and (2) 68% waste water direct reuse in the washing of wood chip; Remaining that 32% waste water send by the aperture is that the film separating system that 10000 dalton, 6000 dalton and three polysulphones hyperfiltration membrane separating units of 500 dalton are formed is handled; The control tranmittance is 99%; Make the solid concentration of concentrated solution reach 4.9%; Send vapo(u)rization system further to be concentrated to 55% concentrated solution and burn, the high-order calorific value of over dry solid substance reaches 12.2MJ/kg.The liquid COD concentration that sees through behind membrane sepn is lower than 300mg/L, is back to use the wood chip washing process.
Embodiment 2
Certain pulping wood factory adopts the outsourcing wood chip to carry out slurrying, the concentration 5% of wood chip in washing machine, and corresponding water consumption is about 19m
3/ t wood chip, the COD of waste water
CrConcentration is 1800mg/L, BOD
5Concentration is 500mg/L, and SS concentration is 1100mg/L, and the pH value is that 6.4 colourities are 660 times, and water temperature is 28 ℃.
(1) above-mentioned wood chip washes is sent gravity settling basin handle, big proportion inorganics such as sandstone dust wherein obtains separating through deposition.And inorganics security landfill to separating.
(2) will send the filter screen mesh through the big waste water than heavy seeds of step (1) processing removal is that 200 purpose disk filters filter the organic substances of removing wherein such as bark, tiny wood chip and wooden dust.The organism that screening is come out send donkey boiler to burn generation heat energy, eliminates the pollution of this part organic waste simultaneously.
(3) after handle step (1) and (2) 68% waste water direct reuse in the washing of wood chip; Remaining that 32% waste water send by the aperture is that the film separating system that 10000 dalton, 3000 dalton and three polysulphones hyperfiltration membrane separating units of 500 dalton are formed is handled; The control tranmittance is 98%; Make the solid concentration of concentrated solution reach 4.6%; Send vapo(u)rization system further to be concentrated to 55% concentrated solution and burn, the high-order calorific value of over dry solid substance reaches 12.6MJ/kg.The liquid COD concentration that sees through behind membrane sepn is lower than 300mg/L, is back to use the wood chip washing process.
Claims (3)
1. paper industry wood chip method for processing wash water.It is characterized in that, may further comprise the steps:
(1) the wood chip washes is sent gravity settling basin handle, utilize the great inorganics of sandstone dust geometric ratio in the proportion official post wood chip washes to precipitate and obtain separating, the gained throw out carries out security landfill, and the gained supernatant liquid gets into next step;
(2) the gained supernatant liquid is sent disk filter filter the organic substances of removing wherein such as bark, tiny wood chip and wooden dust; These leach gained thing and send biomass boiler to burn generation heat energy; Gained filtrating 60%～70% is back to the wood chip washing, and residue 30% filtrating gets into next step;
(3) gained residue 30%～40% filtrating film feeding separation system is handled, and sees through liquid and is back to the wood chip washing, and concentrated solution send vapo(u)rization system to be concentrated to more than 50% and burns.
2. paper industry wood chip method for processing wash water according to claim 1 is characterized in that, described disk filter filter screen mesh is 150～200 orders.
3. paper industry wood chip method for processing wash water according to claim 1 is characterized in that, described film separating system is that three ultra-filtration membrane separating units of 500～10000 dalton are formed by the aperture, and mould material is polysulfones or polyethersulfone.
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| CN 201110259053 CN102351364B (en) | 2011-09-01 | 2011-09-01 | Treatment method of wood chip washing waste water |
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| CN 201110259053 CN102351364B (en) | 2011-09-01 | 2011-09-01 | Treatment method of wood chip washing waste water |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897961A (en) * | 2012-06-29 | 2013-01-30 | 中国制浆造纸研究院 | Method for low-energy consumption condensation of waste liquid produced by alkaline peroxide mechanical pulping |
| CN103358803A (en) * | 2012-04-10 | 2013-10-23 | 朱永彪 | Color stone water casting method |
| CN106049143A (en) * | 2016-06-27 | 2016-10-26 | 南京林业大学 | Fiber board production method free of sewage discharge |
| CN109970273A (en) * | 2018-10-26 | 2019-07-05 | 中国林业科学研究院林业新技术研究所 | A kind of reducing rules wastewater membrane separation coupling evaporation treatment process and device |
| CN112315816A (en) * | 2020-10-28 | 2021-02-05 | 瞿小强 | Preparation method of natural peach gum mask |
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| JP2002239481A (en) * | 2001-02-15 | 2002-08-27 | Togami Electric Mfg Co Ltd | Method and apparatus for cleaning wood |
| CN1714194A (en) * | 2002-11-20 | 2005-12-28 | 梅特索纸业有限公司 | Method and arrangement in making of mechanical pulp |
| CN101575162A (en) * | 2009-06-12 | 2009-11-11 | 广西丰林木业集团股份有限公司 | Method for treating wastewater of fibre-board plant |
| CN101775750A (en) * | 2010-01-22 | 2010-07-14 | 葛文宇 | A clear pulp production process for realizing complete comprehensive utilization and removing three wastes |
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2011
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996036424A1 (en) * | 1995-05-18 | 1996-11-21 | Bwt Aktiengesellschaft | Process and facility for purifying exhaust air, exhaust gases and waste water from a wood processing facility |
| JP2002239481A (en) * | 2001-02-15 | 2002-08-27 | Togami Electric Mfg Co Ltd | Method and apparatus for cleaning wood |
| CN1714194A (en) * | 2002-11-20 | 2005-12-28 | 梅特索纸业有限公司 | Method and arrangement in making of mechanical pulp |
| CN101575162A (en) * | 2009-06-12 | 2009-11-11 | 广西丰林木业集团股份有限公司 | Method for treating wastewater of fibre-board plant |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103358803A (en) * | 2012-04-10 | 2013-10-23 | 朱永彪 | Color stone water casting method |
| CN102897961A (en) * | 2012-06-29 | 2013-01-30 | 中国制浆造纸研究院 | Method for low-energy consumption condensation of waste liquid produced by alkaline peroxide mechanical pulping |
| CN106049143A (en) * | 2016-06-27 | 2016-10-26 | 南京林业大学 | Fiber board production method free of sewage discharge |
| CN109970273A (en) * | 2018-10-26 | 2019-07-05 | 中国林业科学研究院林业新技术研究所 | A kind of reducing rules wastewater membrane separation coupling evaporation treatment process and device |
| CN112315816A (en) * | 2020-10-28 | 2021-02-05 | 瞿小强 | Preparation method of natural peach gum mask |
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Address after: 100102, Beijing Wangjing science and Technology Park, Chaoyang District No. 4 Yang Lu, No. 302 light building, room 3 Applicant after: China National Pulp & Paper Research Institute Co-applicant after: Shandong Taiyang Paper Industry Co., Ltd. Address before: 100061 Beijing city Dongcheng District guangqumenwai South Guan No. 7 Warwick International Apartments Applicant before: China National Pulp & Paper Research Institute Co-applicant before: Shandong Taiyang Paper Industry Co., Ltd. |
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Address after: 100102, Beijing Wangjing science and Technology Park, Chaoyang District No. 4 Yang Lu, No. 302 light building, room 3 Co-patentee after: Shandong Taiyang Paper Industry Co., Ltd. Patentee after: China pulp and Paper Research Institute Co., Ltd. Address before: 100102, Beijing Wangjing science and Technology Park, Chaoyang District No. 4 Yang Lu, No. 302 light building, room 3 Co-patentee before: Shandong Taiyang Paper Industry Co., Ltd. Patentee before: China National Pulp & Paper Research Institute |
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