CN102926257A - Method for waste paper deinking by using biological enzyme - Google Patents
Method for waste paper deinking by using biological enzyme Download PDFInfo
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- CN102926257A CN102926257A CN2011102279612A CN201110227961A CN102926257A CN 102926257 A CN102926257 A CN 102926257A CN 2011102279612 A CN2011102279612 A CN 2011102279612A CN 201110227961 A CN201110227961 A CN 201110227961A CN 102926257 A CN102926257 A CN 102926257A
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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Abstract
The present invention discloses a method for waste paper deinking by using a biological enzyme. The method is characterized in that water with a temperature of 30-65 DEG C is added to a hydrabrusher in advance; then per ton of oven dry waste paper is added with 0.3-10 kg of a special additive, 1.0-4.0 kg of sodium hydroxide and 2.5-6.0 kg of sodium silicate, and complete and uniform mixing is performed; then per ton of oven dry waste paper is added with 0.1-1.0 kg of a biological enzyme, then waste paper is added, a pulp concentration is controlled to 12-18%, and the waste paper pulp is subjected to deinking for 15-40 minutes; and processes of residue removing and flotation are performed to obtain the deinked pulp. According to the present invention, under the condition that the used alkali amount is substantially reduced, the pH value adjustment is not required, the special additive is matched to be used, enzyme adaptability is strong, and stability is good; and compared with the alkaline deinking method in the prior art, the method of the present invention has the following characteristics that: about 80-95% of the use amount of the sodium hydroxide and the sodium silicate is reduced, dirt count of the finished paper is low, BOD content and COD content in the wastewater are substantially reduced, and wastewater treatment cost is reduced.
Description
Technical field the invention belongs to the deinking technical field, relates to a kind of method of carrying out deinking with biology enzyme.
The background technology world today, waste paper recycle reduce pollute, improve environment, economizing on resources has produced huge economic benefit and environmental benefit aspect the energy, be an important aspect that realizes paper industry sustainable development and social sustainable development, the someone is referred to as " forest in city " industry.Integrated two developing directions that progressively become modern paper industry of the recycling of waste paper and woods paper.
China has replaced the country that the U.S. becomes world's papermaking amount maximum.Expectation was from 2011 to 2015, and China will become the first big country of World Paper consumption.Before and after the year two thousand thirty, the paper consumption figure can reach 200,000,000 tons.National paper in 2009 has reached 4,939 ten thousand tons with secondary stock in the slurry, and proportion has always accounted for 62% of slurry amount, amounts to the waste paper amount and is about 6,174 ten thousand tons.Wherein all kinds of waste paper of domestic recovery are near 3,500 ten thousand tons, 2,750 ten thousand tons in all kinds of waste paper of import, and the imported waste paper amount accounts for more than 40% of total waste paper total amount.But China's waste paper recovery utilization rate is low, and also there is a big difference between world average level and the developed country, reflects that China's waste paper recycling exists great potential.Meanwhile, China is faced with problems such as imported waste paper Resource Dependence degree height.Be accompanied by the fast development of China's economy and the raising of paper consumption figure, the waste paper demand also will further increase.The Chinese government has strengthened in policy, fund and technical supporting dynamics for this reason, and waste paper is recycled industry will become an emerging bright spot of investment.
Traditional deinking technique is used a large amount of chemicalss, brings the burden of wastewater treatment and environmental pollution.And because the development of xerography and laser printing technology, traditional chemical method deinking process is difficult to obtain preferably removal effect for thermosetting ink and some toner.Utilizing biology enzyme that waste paper is carried out deinking is a kind of cost-effective de-inking method, can reduce the problem of environmental pollution that Chemical Deinking brings, and reduces the consumption of bleached chemical medicine and improves the advantages such as water filtering performance of slurry.
The at present main promising cellulase of biology enzyme commonly used and zytase (nineties, just begin to report Patents abroad, see US5364501A for details, WO9114819A1 and US5525193A patent etc.), utilize the catalytic action of biology enzyme, attack printing ink or fiber surface, destroy the stress point on the cellulose macromolecule in the fibrous reticular structure, change near the connecting key of fiber surface or ink particle, so that printing ink is connected connection and is become lax with fiber, then under the effect of mechanical force, the particle that printing ink is dispersed into a certain size separates from fiber surface, with floatation or washing method the ink particle that separates is removed from paper pulp again, thereby reached the purpose of deinking.Utilize biological enzyme that waste paper has been carried out the deinking decrease to the use amount of NaOH and sodium metasilicate, the pulping section does not add hydrogen peroxide and chelating agent.With respect to the deinking of conventional chemical method, dirt count obviously reduces after the deinking, and deinking wastewater COD and BOD content obviously reduce more than 25%, have reduced equipment corrosion, bring the economy and environment benefit to enterprise.
The used deinking enzyme of present domestic most papermaking enterprises, take acidic cellulase and zytase as main, composition is comparatively single substantially.Abroad can provide neutral cellulase and the zytase except company of outstanding energy section of Denmark Novozymes Company and the U.S., domestic rarely have biofermentation company to produce.And most biology enzymes are inadequate to pulp-water system pH adaptability (general pulping section pH is alkaline range), and it is larger affected by pH, causes deinking efficiency stable not, and impact is normally produced.Therefore developing a kind of Enzymatic Deinking new technology that can be adapted to the biological enzyme deinking of neutral meta-alkali environment and fully be lowered into the paper dirt count has great importance.
Summary of the invention the objective of the invention is to solve deinking efficiency that prior art exists Enzymatic Deinking to be difficult to reach good, biology enzyme stability in use not, form single, become the higher technical problem of dirt count behind the paper, provide a kind of and carry out the method for deinking with biology enzyme, to overcome the deficiencies in the prior art.
To achieve these goals, the present invention carries out the method for deinking with biology enzyme, and its main points are to be undertaken by following processing step:
(1) preparation biology enzyme: be that 600-1000U cellulase, 1000-2500U zytase, 8000-12000U lipase, 600-1500U amylase and 400-800U alkaline pectase fully mix with enzyme activity, for subsequent use;
(2) preparation special assistant: aliphatic alcohol polyethenoxy sodium sulphate, sodium alkyl benzene sulfonate, oleic acid, alkylphenol polyoxyethylene, OPEO and Tween 80 were pressed the quality proportioning 8: 6: 12: 5: 7: 3 formulated, fully mix, for subsequent use;
(3) waste paper pulping deinking: the water that in hydrabrusher, adds in advance 30-65 ℃, add 0.3-10kg special assistant, 1.0-4.0kg NaOH and 2.5-6.0kg sodium metasilicate by over dry waste paper per ton again, fully behind the mixing, the biology enzyme that adds again 0.1-1.0kg step (1) preparation by over dry waste paper per ton, then add afterwards waste paper, the control slurry is dense to be 12-18%, and waste paper pulping deinking 15-40 minute obtains Deinking Pulp again after slagging-off, flotation operation.
The biology enzyme that the present invention adopts is the complex enzyme formulation that multiple hydrolase forms, and " working in coordination with " Deinking Effect of the special assistant of employing and biology enzyme is effective, also can indirectly improve biological Enzymic stability.
The present invention does not need to regulate pH under the condition of decrease alkali charge, cooperate special assistant to use in the lump, enzyme adaptation strong (pH and temperature to the pulp-water system have more wide in range adaptability), and enzyme activity is high, good stability.Compare the use amount that can reduce about 80-95% NaOH and sodium metasilicate with the prior art alkaline deinking, become the paper dirt count low, decrease the BOD of waste water and the content of COD, reduced the expense of wastewater treatment.
Specific embodiment the present invention carries out the method for deinking with biology enzyme, specifically carries out with reference to following embodiment:
Embodiment 1 processes secondhand book periodical and magazine paper
(1) wastepaper as raw material is prepared: old book paper is torn into the scraps of paper of 2cm * 2cm, and equilibrium water conten is placed in the closed container, and is for subsequent use.
(2) preparation biology enzyme: be that 800U cellulase, 2000U zytase, 10000U lipase, 1000U amylase and 6800U alkaline pectase fully mix with enzyme activity, for subsequent use;
(3) preparation special assistant: aliphatic alcohol polyethenoxy sodium sulphate, sodium alkyl benzene sulfonate, oleic acid, alkylphenol polyoxyethylene, OPEO and Tween 80 were pressed the quality proportioning 8: 6: 12: 5: 7: 3 formulated, fully mix, for subsequent use;
(4) waste paper pulping deinking: the water that in hydrabrusher, adds in advance 50 ℃, add 0.5kg special assistant, 1.0kg NaOH and 2.5kg sodium metasilicate by over dry waste paper per ton again, fully behind the mixing, the biology enzyme that adds again 0.2kg step (2) preparation by over dry waste paper per ton, then add afterwards waste paper, the control slurry is dense to be 15%, and waste paper pulping deinking 20 minutes obtains Deinking Pulp again after slagging-off, flotation operation.
Each parameter of pulping and floatation process: pulping concentration 15%, pulping temperature 50 C, system pH are 6-10, and pulping time is 20 minutes, and the biology enzyme consumption is 0.20kg/t over dry waste paper, and the special assistant consumption is 0.50kg/t over dry waste paper.It is dense 0.1% that flotation is starched, flotation time 15 minutes, 45 ℃ of flotation temperatures.
Conventional alkaline deinking technological parameter: pulping concentration 15%, the pulping temperature 50 C is pressed over dry waste paper again and is added quality than NaOH 1.0%, sodium metasilicate 2.5%, deinking agent 0.4%.Each parameter is consistent with above-mentioned biological enzyme deinking during flotation.
Two kinds of de-inking method deinking efficiency results are as follows:
The conventional alkaline deinking of table 1 and biological enzyme deinking efficiency are relatively
| Conventional alkaline deinking | The biological enzyme deinking | Variable value | |
| Deinking Pulp whiteness (%ISO) | 63.7 | 62.1 | -1.6 |
| Deinking Pulp ERIC value (mg/kg) | 318.4 | 280.9 | -37.5 |
| The Deinking Pulp dirt count is (individual/m 2) | 51 | 43 | -8 |
| Yield (%) | 81.1 | 83.7 | +2.6 |
| Deinking wastewater CODcr (mg/L) | 420.8 | 310.6 | -110.2 |
| Deinking wastewater BOD 5(mg/L) | 182.3 | 141.6 | -40.7 |
The result shows, starches lower slightly 1.6%ISO though biological enzyme deinking gained Deinking Pulp whiteness is compared conventional alkaline deinking, and effectively residual ink amount (ERIC value) and dirt count are starkly lower than the alkaline deinking slurry, reduce respectively 11.8% and 15.7%; Yield has also improved 2.6%.CODcr and the BOD of waste water after the deinking
5, obviously reduce after the biological enzyme deinking, reduced respectively 26% and 22%, this has reduced the wastewater treatment expense to a great extent, and environmental benefit is obvious, has also alleviated the loss to equipment simultaneously.
Embodiment 2 processes Mixed Office WasteMOW
The preparation of test raw material and floatation process parameter are all with embodiment 1.
Each parameter of pulping technique: pulping concentration 12%, pulping temperature 45 C, system pH are 7-10, and pulping time is 20 minutes, and the biology enzyme consumption is 0.25kg/t over dry waste paper, and the special assistant consumption is 0.60kg/t over dry waste paper.
Result of the test shows: biological enzyme deinking gained Deinking Pulp whiteness is than the low 1.5%ISO of conventional alkaline deinking slurry, and Deinking Pulp ERIC value reduces by 9.2%.The CODcr of waste water and BOD after the deinking
5, reduced respectively 31% and 27% after the biological enzyme deinking, reduced to a great extent the wastewater treatment expense, environmental benefit is obvious.
Embodiment 3 is according to embodiment 1, and difference is that wastepaper as raw material is waste and old brown paper.The biology enzyme consumption is 0.20kg/t over dry waste paper, and the special assistant consumption is 0.75kg/t over dry waste paper.
Embodiment 4 is according to embodiment 2, and difference is that wastepaper as raw material is that old book paper, outdated magazine paper and waste newsprint ratio are 30%: 50%: 20%.
Facts have proved: affect several key factors that biology enzyme is used for the deinking effect:
1, pulping pH value: under suitable pH value, enzyme has best ability to function, suitably regulates by adding an amount of NaOH and sodium metasilicate, and the pH value is on the low side or higher, all can cause enzyme activity reduction in various degree.
2, pulping temperature: because the different in kind of every kind of enzyme, thereby its operative temperature scope there are differences.If system temperature is excessively low during pulping, the enzyme activity functioning efficiency is then on the low side; If excess Temperature can make the enzyme deactivation sex change, its hydrolysis ability weakens greatly, finally causes deinking efficiency obviously to reduce.
3, pulping time: pulping time during according to size degradation the degree of coming off of ink particle decide, generally between 15-40 minute.Time is too short, and repulping of waste paper is insufficient; Overlong time, the ink particle that the suitable mechanical force of warp and enzyme hydrolysis effect split away off can be adsorbed onto fiber surface again, causes follow-up flotation efficiency to reduce, and it is not high to cause into the paper whiteness.
4, ink particle separate mode: washing method and floatation.According to different deinking process flow processs and producer quality of finished paper is required difference, select different modes.
5, the type selecting of special assistant: different according to waste paper kind and printing ink composition, selects suitable and the special assistant common use of biology enzyme.
Biology enzyme involved in the present invention is mainly produced by Shandong Continent Biological Technology Co., Ltd.
The preparation of biology enzyme is carried out proportioning by the various enzyme activity units of cellulase, zytase, lipase, amylase and alkaline pectase.
Claims (1)
1. one kind is carried out the method for deinking with biology enzyme, it is characterized in that being undertaken by following processing step:
(1) preparation biology enzyme: be that 600-1000U cellulase, 1000-2500U zytase, 8000-12000U lipase, 600-1500U amylase and 400-800U alkaline pectase fully mix with enzyme activity, for subsequent use;
(2) preparation special assistant: aliphatic alcohol polyethenoxy sodium sulphate, sodium alkyl benzene sulfonate, oleic acid, alkylphenol polyoxyethylene, OPEO and Tween 80 were pressed the quality proportioning 8: 6: 12: 5: 7: 3 formulated, fully mix, for subsequent use;
(3) waste paper pulping deinking: the water that in hydrabrusher, adds in advance 30-65 ℃, add 0.3-10kg special assistant, 1.0-4.0kg NaOH and 2.5-6.0kg sodium metasilicate by over dry waste paper per ton again, fully behind the mixing, the biology enzyme that adds again 0.1-1.0kg step (1) preparation by over dry waste paper per ton, then add afterwards waste paper, the control slurry is dense to be 12-18%, and waste paper pulping deinking 15-40 minute obtains Deinking Pulp again after slagging-off, flotation operation.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437231A (en) * | 2013-08-30 | 2013-12-11 | 华南理工大学 | Alkaline biological enzyme deinking agent and application technology thereof in waste paper deinking |
| CN104213450A (en) * | 2014-09-18 | 2014-12-17 | 苏州新协力环保科技有限公司 | Deinking treatment method of mixed office waste paper |
| CN105542551A (en) * | 2015-12-15 | 2016-05-04 | 林康艺 | Composition for deinking waste paper |
| CN106988143A (en) * | 2017-05-23 | 2017-07-28 | 福州闽辉鞋材有限公司 | A kind of secondary footwear midsole paperboard slurry, deinking agent and de-inking method |
| CN107059458A (en) * | 2017-05-23 | 2017-08-18 | 福州闽辉鞋材有限公司 | Bottom plate and preparation method thereof during a kind of footwear are used |
| CN107881829A (en) * | 2017-11-04 | 2018-04-06 | 福建省晋江优兰发纸业有限公司 | A kind of method of pulp from decoloured waste paper production high intensity tissue |
| CN108660838A (en) * | 2018-04-28 | 2018-10-16 | 句容市兴武包装有限公司 | A kind of deinking treatment process of waste paper |
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| JPH0949179A (en) * | 1995-08-01 | 1997-02-18 | Oji Paper Co Ltd | Production of deinked pulp |
| CN1160791A (en) * | 1997-02-20 | 1997-10-01 | 天津轻工业学院 | Biological ink-removing process for regenerating used paper |
| CN1648331A (en) * | 2004-11-24 | 2005-08-03 | 深圳市绿微康生物工程有限公司 | New process for lipase waste paper deinking |
| CN1763306A (en) * | 2005-11-18 | 2006-04-26 | 山东轻工业学院 | Neutral deinking method for waste newspaper |
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2011
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0949179A (en) * | 1995-08-01 | 1997-02-18 | Oji Paper Co Ltd | Production of deinked pulp |
| CN1160791A (en) * | 1997-02-20 | 1997-10-01 | 天津轻工业学院 | Biological ink-removing process for regenerating used paper |
| CN1648331A (en) * | 2004-11-24 | 2005-08-03 | 深圳市绿微康生物工程有限公司 | New process for lipase waste paper deinking |
| CN1763306A (en) * | 2005-11-18 | 2006-04-26 | 山东轻工业学院 | Neutral deinking method for waste newspaper |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437231A (en) * | 2013-08-30 | 2013-12-11 | 华南理工大学 | Alkaline biological enzyme deinking agent and application technology thereof in waste paper deinking |
| CN103437231B (en) * | 2013-08-30 | 2016-04-13 | 华南理工大学 | A kind of alkaline enzymatic deinking agent and the technique for applying in deinking thereof |
| CN104213450A (en) * | 2014-09-18 | 2014-12-17 | 苏州新协力环保科技有限公司 | Deinking treatment method of mixed office waste paper |
| CN105542551A (en) * | 2015-12-15 | 2016-05-04 | 林康艺 | Composition for deinking waste paper |
| CN106988143A (en) * | 2017-05-23 | 2017-07-28 | 福州闽辉鞋材有限公司 | A kind of secondary footwear midsole paperboard slurry, deinking agent and de-inking method |
| CN107059458A (en) * | 2017-05-23 | 2017-08-18 | 福州闽辉鞋材有限公司 | Bottom plate and preparation method thereof during a kind of footwear are used |
| CN106988143B (en) * | 2017-05-23 | 2019-01-11 | 福州闽辉鞋材有限公司 | A kind of secondary shoes insole board paper pulp, deinking agent and de-inking method |
| CN107881829A (en) * | 2017-11-04 | 2018-04-06 | 福建省晋江优兰发纸业有限公司 | A kind of method of pulp from decoloured waste paper production high intensity tissue |
| CN108660838A (en) * | 2018-04-28 | 2018-10-16 | 句容市兴武包装有限公司 | A kind of deinking treatment process of waste paper |
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Application publication date: 20130213 |