CN105198116A - Method for reducing wastewater generation during clean papermaking - Google Patents
Method for reducing wastewater generation during clean papermaking Download PDFInfo
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- CN105198116A CN105198116A CN201510544241.7A CN201510544241A CN105198116A CN 105198116 A CN105198116 A CN 105198116A CN 201510544241 A CN201510544241 A CN 201510544241A CN 105198116 A CN105198116 A CN 105198116A
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- 238000000034 method Methods 0.000 title claims abstract description 61
- 239000002351 wastewater Substances 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 131
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 31
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 26
- 238000010790 dilution Methods 0.000 claims abstract description 18
- 239000012895 dilution Substances 0.000 claims abstract description 18
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 16
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 14
- 238000004513 sizing Methods 0.000 claims abstract description 13
- 229920002472 Starch Polymers 0.000 claims abstract description 8
- 239000008107 starch Substances 0.000 claims abstract description 8
- 235000019698 starch Nutrition 0.000 claims abstract description 8
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 8
- 239000012498 ultrapure water Substances 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 15
- 238000007493 shaping process Methods 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 230000015556 catabolic process Effects 0.000 claims description 4
- 150000001768 cations Chemical class 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 4
- 238000006731 degradation reaction Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000000746 purification Methods 0.000 abstract description 3
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- 238000009825 accumulation Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
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- 230000010287 polarization Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 102100024482 Cell division cycle-associated protein 4 Human genes 0.000 description 1
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- 101000980898 Homo sapiens Cell division cycle-associated protein 4 Proteins 0.000 description 1
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Abstract
The invention discloses a method for reducing wastewater generation during clean papermaking. Part of weak white water generated during production enters the paper stock dilution procedure to be reused together with enriched water, part of weak white water enters a white water filter to be filtered, and the rest of weak white water is introduced into paper pulp to be used after a softener is added; ultra-clear water generated after weak white water is treated with the white water filter enters the ultrafiltration procedure; concentrated liquor generated in the ultrafiltration procedure is used for starch dextrinization in the surface sizing procedure, and generated clear water directly enters the reverse osmosis procedure; ultrapure water generated in the reverse osmosis procedure enters the press section procedure to be used, and trace inorganic salt concentrated liquor is generated at the same time to be treated as wastewater. According to the method, water softening and purification are achieved during papermaking, system accretion of Ca2+, Mg2+ and DCS is eliminated, and clean papermaking and papermaking wastewater trace treatment and discharge are achieved.
Description
Technical field
The invention belongs to pulp technology for making paper, be specifically related in a kind of clean paper making, reduce the method producing waste water.
Background technology
At present, domestic and international clean paper making technology all adopts " DCS (DissolvedandColloidalSubstances; be called for short DCS; dissolve and colloidalmaterial) controls+microparticle retention and drainage system+multi-disc type white water filter machine " Technology above to combine substantially, improves the cyclically utilizing degree of plain boiled water with maximum possible.But these methods do not reach re-set target, be gathered into oarse-grained colloidality substance accumulation on the one hand still very serious, in addition, white water filter machine cannot remove the electrolytical accumulation of deliquescent inorganic salt.Therefore, current paper manufacturing systems is necessary constantly discharge unit plain boiled water still, supplements fresh water, to maintain the electrochemical equilibrium of wet end system, keeps the relative clean of paper manufacturing systems, guarantee the steady running of paper machine.
Hepp. in 2005 etc. by Ultra filtration membrane technology can by paper machine white water 99% suspended substance separate, the clear water after ultrafiltration can be used for washing net, scouring of wool cloth.The people such as Sierka adopt UF, MF, NF and RO through different grades molecular mass to test three kinds of plain boiled waters, TOC, COD and conductivity variations index after analyzing and processing, and uf processing is applicable to removing the suspended particulate in plain boiled water or insoluble organism; Nanofiltration membrane (DESAL-5) to TOC clearance 78.0 ~ 93.6%, COD clearance 87 ~ 95.2%, specific conductivity decline 63.6 ~ 74.0%; Low-pressure reverse osmosis membrane process (BW-30) plain boiled water, TOC clearance 78.0 ~ 96.7%, COD clearance 88 ~ 94.2, specific conductivity decline 95.1 ~ 97.3%.But these trials all do not popularize, and its reason is DCS, Ca in mthod of white water from paper making
2+ion content is high, and film is existed to the problems such as serious fouling, easily pollution, concentration polarization, film is short for work-ing life, and ton cost of water treatment is high, and enterprise is difficult to bear.
Colloidal type material in DCS comes from resinous acid in fibrous material and lipid acid, and the hydrolysate etc. of functional agent AKD, belongs to hydrophobic organic compound.Water-soluble class material in DCS comes from hemicellulose, oxalic acid and pectic substance in fibrous material, and filler, dispersion agent in dye well AKD sizing agent, starch etc., if recycling is at paper surface-sizing agent or as primary coat colo(u)rant dispersion medium, do not affect quality product, and have certain help to applying glue, enhancing.But, due to the harm of well-known DCS, still adopt at present both at home and abroad flocculation sediment, aerating oxidation, biological decomposition (active sludge or blodisc), anaerobic digestion, Fenton oxidation, the combined treatment link such as stable, DCS (COD main component) in process waste water, to make discharge water COD up to standard.Be actually and go to deal with so-called " pollutent " by a large amount of human and material resources, financial resources, both wasted resource, a kind of very passive way sunk money again.
Summary of the invention
Goal of the invention: for the deficiencies in the prior art, the object of this invention is to provide a kind of method reducing in clean paper making and produce waste water, had both met cleaner production requirement, and can economize on resources again, and can also preserve the ecological environment.
Technical scheme: for achieving the above object, the technical solution used in the present invention is as follows:
The method producing waste water is reduced: the paper pulp prepared after stock dilution, shaping wet end, press part and top sizing operation, is prepared into paper successively in a kind of clean paper making; Rare plain boiled water and enriched water is produced in shaping wet end operation, rare plain boiled water is produced in press part operation, after rare plain boiled water that two operations produce directly mixes and concentrates, part inputs enriched water, enter stock dilution operation to reuse together with enriched water, part enters white water filter machine and carries out filtration treatment, and remaining rare plain boiled water then inputs paper pulp and uses after adding tenderizer; Rare plain boiled water is after white water filter machine process, the turbid plain boiled water produced directly enters paper pulp and uses, the recovery slurry produced enters the process of stock dilution operation together with the fresh stock prepared, and the pure water of generation rinses for the wet end that is shaped and uses, and the super clear water of generation enters ultrafiltration operation; The concentrated solution that ultrafiltration operation produces, enter top sizing operation and use as starch pasting water, the clear water of generation directly enters reverse osmosis operation; The ultrapure water that reverse osmosis operation produces enters press part operation and uses, and generate small-scale inorganic salt concentrated solution simultaneously and process as waste water, obtain inorganic salt and do and whole water, whole water meets emission standard and directly discharges.
The method producing waste water is reduced in described clean paper making, tenderizer access point offered by the plain boiled water pipeline of paper feeding pulpboard size degradation, and storage tank is set at wet end chemistry auxiliary agent weighing room, be connected with the tenderizer access point pipeline on plain boiled water pipeline by volume pump, tenderizer flow control is controlled by control system for paper machine.
The method producing waste water is reduced in described clean paper making, for ultrafiltration and the reverse osmosis unit of ultrafiltration and reverse osmosis operation, be located near multi-disc type white water filter machine, the super clear water pipeline going out multi-disc type filter is accessed ultra-filtration equipment, and under ultra-filtration equipment, builds ultrafiltration and concentration liquid storage tank, ultrafiltrate storage tank; Ultrafiltrate groove is connected to reverse osmosis unit by pump pipeline, and under reverse osmosis unit, builds ultrapure water storage tank, inorganic salt concentrated solution storage tank.
Reduce the method producing waste water in described clean paper making, tenderizer is polyvalent metal cation refuse removal agent.
Reduce the method producing waste water in described clean paper making, the mass percentage concentration adding tenderizer solution at plain boiled water pipeline tenderizer access point is 0.1 ~ 1.0%.The quality consumption of tenderizer is 0.05 ~ 0.1% of paper per ton.
Beneficial effect: reduce the method producing waste water in clean paper making of the present invention, by realizing water demineralization and purification in paper making process, eliminates Ca
2+, Mg
2+, DCS and the accumulation of inorganic salt electrolytical system, realize clean paper making and discharge with micro-process of paper waste, compared with traditional paper making process and wastewater treatment, there is following advantage:
1) agent of papermaking water softener can effectively be shifted and the Ca controlled in paper manufacturing systems
2+, Mg
2+deng polyvalent metal ion, reduce water hardness.
2) enhance Anionic Trash Catcher effectively shift DCS and control, maintain wet end system electrolyte balance, improve retention aid and filter aid usefulness, make plain boiled water water quality obtain softening and purification.
3) eliminate or greatly pollution remission thing to technical barriers such as the fouling of film, pollution and concentration polarizations.
4) significantly reduce sewage load and processing load, existing sewage work floor space can significantly reduce, and water resources taxes, effluent charge, sewage disposal expense, water transmitting power expense also will be saved, and have integrated operation cost benefit.
5) owing to achieving water in production process and chaff interference recycling, initial estimate is often produced 1 ton of paper and is only produced less than 1m
3naCl and Na
2sO
4mixture concentrated solution, does not have the H that sewage disposal produces
2s foul smell and mud secondary pollution problem.
6) " clean paper making and waste water near zero release technology " can save pollution plot link, and originally so-called " pollutent " can carry out recycling, truly realized clean paper making.
Accompanying drawing explanation
Fig. 1 is existing clean paper making process flow sheet;
Fig. 2 is the process flow sheet reducing the method producing waste water in the clean paper making of the application.
Embodiment
Below in conjunction with specific embodiment, the present invention is further illustrated.According to following embodiment, the present invention may be better understood.But those skilled in the art will readily understand, concrete material proportion, processing condition and result thereof described by embodiment only for illustration of the present invention, and should also can not limit the scope of the invention.Operation not detailed in following examples is the routine operation of this area.
Embodiment 1
As shown in Figure 1, existing clean paper making technique, general procedure is as follows:
The paper pulp prepared after stock dilution, shaping wet end, press part and top sizing operation, is prepared into paper successively.A large amount of rare plain boiled water and enriched water can be produced in shaping wet end operation, also a large amount of rare plain boiled water can be produced in press part operation, after rare plain boiled water that two operations produce directly mixes and concentrates, part inputs enriched water, enter stock dilution operation to reuse together with enriched water, part enters white water filter machine and carries out filtration treatment, and remaining rare plain boiled water then first carries out sewage disposal, discharges after up to standard.Rare plain boiled water is after white water filter machine process, the turbid plain boiled water produced directly enters paper pulp and uses, the recovery slurry produced enters the process of stock dilution operation together with the fresh stock prepared, the super clear water produced is used for forming net and the clean use of press felt, and the pure water of generation enters shaping wet end operation and uses.Meanwhile, in continuous flow procedure, also need a certain amount of fresh water of continuous supplementation in press part operation.
For 500,000 tons of paper/years production line, in shaping wet end operation, ton paper can produce rare plain boiled water of about 30 ~ 40 tons and the enriched water of 140 ~ 160 tons, also rare plain boiled water of 10 ~ 15 tons can be produced in press part operation, 30 ~ 40 tons of rare plain boiled water input enriched waters, enter stock dilution operation to reuse together with enriched water, 10 tons of rare plain boiled waters enter white water filter machine and carry out filtration treatment, and 8 ~ 10 tons of rare plain boiled waters then first carry out sewage disposal, discharge after up to standard.Rare plain boiled water is after white water filter machine process, produce 3 tons of turbid plain boiled waters and directly enter paper pulp use, 20 ~ 25 kilograms that produce are reclaimed slurry and enter the process of stock dilution operation together with the fresh stock prepared, produce 3 tons of super clear water and enter the use of shaping wet end operation, produce 4 tons of pure water and also enter the use of shaping wet end operation.Meanwhile, in continuous flow procedure, also need in press part operation, constantly add 4 ~ 6 tons of fresh waters, and chemical assistant dilution fresh water 4 ~ 8 tons.Add up to and produce waste water 8 ~ 10 tons, need to increase fresh water 10 ~ 12 tons.
Embodiment 2
Reduce the method producing waste water in the clean paper making of the application, as shown in Figure 2, detailed process is as follows in technical process:
The paper pulp prepared after stock dilution, shaping wet end, press part and top sizing operation, is prepared into paper successively.A large amount of rare plain boiled water and enriched water can be produced in shaping wet end operation, also a large amount of rare plain boiled water can be produced in press part operation, after rare plain boiled water that two operations produce directly mixes and concentrates, part inputs enriched water, enter stock dilution operation to reuse together with enriched water, part enters white water filter machine and carries out filtration treatment, and remaining rare plain boiled water then inputs paper pulp and uses after adding tenderizer.Rare plain boiled water is after white water filter machine process, the turbid plain boiled water produced directly enters paper pulp and uses, the recovery slurry produced enters the process of stock dilution operation together with the fresh stock prepared, and the pure water of generation rinses for the wet end that is shaped and uses, and the super clear water of generation directly enters ultrafiltration operation.The concentrated solution that ultrafiltration operation produces, enter top sizing operation and use as starch pasting water, the clear water of generation directly enters reverse osmosis operation; The ultrapure water that reverse osmosis operation produces enters press part operation and uses, and generates inorganic salt concentrated solution simultaneously and processes as waste water, obtains inorganic salt and uses as industrial chemicals, produce a small amount of whole water and directly discharge after Fenton oxidation process is up to standard.
For 500,000 tons of paper/years production line, rare plain boiled water of 30 ~ 40 tons and the enriched water of 140 ~ 160 tons can be produced in shaping wet end operation, also rare plain boiled water of 10 ~ 15 tons can be produced in press part operation, rare plain boiled water all inputs enriched water, enters stock dilution operation and reuse together with enriched water.30 tons of rare plain boiled waters enter white water filter machine and carry out filtration treatment, enriched water is after white water filter machine process, producing after about 10 tons of turbid plain boiled waters add 0.5 ~ 1.0 kilogram of tenderizer send size degradation paper pulp to use, 60 ~ 75 kilograms that produce are reclaimed slurry and enter the process of stock dilution operation together with the fresh stock prepared, produce 10 tons of pure water directly to enter wet end and uses with clean forming net for spray, common property gives birth to 10 tons of super clear water.10 tons of super clear water enter ultrafiltration operation, and ultrafiltration operation produces 2 tons of concentrated solutions, enter top sizing operation and use as starch pasting water; 8 tons of clear water that ultrafiltration produces directly enter reverse osmosis operation, reverse osmosis operation produces 7 tons of ultrapure waters and sprays for press part and clean woollen blanket, produce 1 ton of inorganic salt concentrated solution, inorganic salt concentrated solution, after wastewater treatment, obtains 25 ~ 30 kilograms of inorganic salt and uses as industrial chemicals simultaneously.
Add up to and produce waste water about 1 ton, generate 25 ~ 30 kilograms of inorganic salt.
This technique, in specific implementation process, on the maintenance constant basis of existing processing unit, needs to make following innovation:
1) on the plain boiled water pipeline of paper feeding pulpboard size degradation, tenderizer access point is offered, and storage tank is set at wet end chemistry auxiliary agent weighing room, be connected with the tenderizer access point pipeline on plain boiled water pipeline by volume pump, tenderizer flow control is included control system for paper machine in and is carried out controlling.
2) ultrafiltration and reverse osmosis membrane separation device are set: ultrafiltration and reverse osmosis unit are arranged near multi-disc type white water filter machine, the super clear water pipeline going out multi-disc type filter is accessed ultra-filtration equipment, and under ultra-filtration equipment, builds ultrafiltration and concentration liquid storage tank, ultrafiltrate storage tank; Ultrafiltrate groove is connected to reverse osmosis unit by pump pipeline, and under reverse osmosis unit, builds ultrapure water storage tank, reverse osmosis concentrated liquid storage tank.
3) the concentrated solution main component that ultrafiltration produces is water-soluble high-molecular substance, has certain enhancement, substitute fresh water for original surface sizing starch gelatinization to paper.
Wherein, tenderizer be polyvalent metal cation refuse removal agent disclosed in CN101408016A or other can be used for removing the reagent of paper making wet part multivalent metal cation.The mass percentage concentration adding tenderizer solution at plain boiled water pipeline tenderizer access point is 0.1% ~ 1.0, and quality consumption controls at 0.05 ~ 0.1% (relative ton paper), and it is constant that other conditions maintain original manufacturing condition.
The ultrapure water that reverse osmosis obtains is used for supplementing produces required fresh water, and ultrafiltration and concentration liquid is used for surface sizing starch gelatinization water, and inorganic salt concentrated solution send sewage disposal, and final ton paper fresh water magnitude of recruitment drops to 2m
3, wet end system specific conductivity maintains near 1400 μ s/cm, and ton paper SS discharge reduces to 60g by current ton paper 450g, and COD reduces to 100g by 750g.
Papermaking Conventional waste water handling up to standard 1.5 yuan/m
3, ultrafiltration+reverse osmosis 2.0 yuan/m
3, ton paper process waste water 8m
3; Ton paper supplements clear water 1m
3, price 1.2 yuan/m
3; Ton paper chemical assistant reduces consumption 15% (about 15 yuan); Ton paper raw material losses reduces by 2% (about 40 yuan); Metallic cation rubbish control agent ton paper increases by 15 yuan.So adjust with 500,000 tons of paper/year, then year economic benefit 7,500,000 yuan, annually save water 3,500,000 m
3.
Therefore, reduce in clean paper making of the present invention and produce the method for waste water and can be called as that " cleaner production and waste water near zero release technology, the enforcement of this technology, not only has economic benefit, and has huge social benefit.
Claims (6)
1. reduce the method producing waste water in clean paper making, the paper pulp prepared after stock dilution, shaping wet end, press part and top sizing operation, is prepared into paper successively; It is characterized in that: in shaping wet end operation, produce rare plain boiled water and enriched water, rare plain boiled water is produced in press part operation, after rare plain boiled water that two operations produce directly mixes and concentrates, part inputs enriched water, enter stock dilution operation to reuse together with enriched water, part enters white water filter machine and carries out filtration treatment, and remaining rare plain boiled water then inputs paper pulp and uses after adding tenderizer; Rare plain boiled water is after white water filter machine process, the turbid plain boiled water produced directly enters paper pulp and uses, the recovery slurry produced enters the process of stock dilution operation together with the fresh stock prepared, and the pure water of generation rinses for the wet end that is shaped and uses, and the super clear water of generation directly enters ultrafiltration operation; The concentrated solution that ultrafiltration operation produces, enter top sizing operation for starch pasting, the clear water of generation directly enters reverse osmosis operation; The ultrapure water that reverse osmosis operation produces enters press part operation and uses, and generate small-scale inorganic salt concentrated solution simultaneously and process as waste water, obtain inorganic salt and do and whole water, whole water meets emission standard and directly discharges.
2. in clean paper making according to claim 1, reduce the method producing waste water, it is characterized in that, tenderizer access point offered by the plain boiled water pipeline of paper feeding pulpboard size degradation, and storage tank is set at wet end chemistry auxiliary agent weighing room, be connected with the tenderizer access point pipeline on plain boiled water pipeline by volume pump, tenderizer flow control is controlled by control system for paper machine.
3. in clean paper making according to claim 1, reduce the method producing waste water, it is characterized in that, for ultrafiltration and the reverse osmosis unit of ultrafiltration and reverse osmosis operation, be located near multi-disc type white water filter machine, the super clear water pipeline going out multi-disc type filter is accessed ultra-filtration equipment, and under ultra-filtration equipment, builds ultrafiltration and concentration liquid storage tank, ultrafiltrate storage tank; Ultrafiltrate groove is connected to reverse osmosis unit by pump pipeline, and under reverse osmosis unit, builds ultrapure water storage tank, inorganic salt concentrated solution storage tank.
4. reduce the method producing waste water in clean paper making according to claim 1, it is characterized in that, tenderizer is polyvalent metal cation refuse removal agent.
5. reduce the method producing waste water in clean paper making according to claim 1, it is characterized in that, the mass percentage concentration adding tenderizer solution at plain boiled water pipeline tenderizer access point is 0.1 ~ 1.0%.
6. reduce the method producing waste water in clean paper making according to claim 1, it is characterized in that, the quality consumption of tenderizer is 0.05 ~ 0.1% of paper per ton.
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| CN107513879A (en) * | 2017-10-23 | 2017-12-26 | 南京林业大学 | A kind of recycling reuse method of mthod of white water from paper making anionic trash |
| CN109574314A (en) * | 2018-12-28 | 2019-04-05 | 江苏理文造纸有限公司 | A kind of water treatment system of papermaking green end |
| CN112301780A (en) * | 2020-09-18 | 2021-02-02 | 江苏理文造纸有限公司 | Anionic garbage control process for papermaking system |
| CN114108356A (en) * | 2021-10-21 | 2022-03-01 | 江苏理文造纸有限公司 | Papermaking white water anion garbage recycling process |
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| CN109574314A (en) * | 2018-12-28 | 2019-04-05 | 江苏理文造纸有限公司 | A kind of water treatment system of papermaking green end |
| CN112301780A (en) * | 2020-09-18 | 2021-02-02 | 江苏理文造纸有限公司 | Anionic garbage control process for papermaking system |
| CN114108356A (en) * | 2021-10-21 | 2022-03-01 | 江苏理文造纸有限公司 | Papermaking white water anion garbage recycling process |
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| CN105198116B (en) | 2017-07-18 |
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