CN102108650B - Zero-wastewater-emission pulping method - Google Patents
Zero-wastewater-emission pulping method Download PDFInfo
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- CN102108650B CN102108650B CN2009102168720A CN200910216872A CN102108650B CN 102108650 B CN102108650 B CN 102108650B CN 2009102168720 A CN2009102168720 A CN 2009102168720A CN 200910216872 A CN200910216872 A CN 200910216872A CN 102108650 B CN102108650 B CN 102108650B
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Abstract
The invention discloses a zero-wastewater-emission pulping method, which is characterized in that: in the pulping process, the used medicaments at most comprise Mg(OH)2 or MgO, H2SO4, CaO or Ca(OH)2, H2O2, O2, O3, bio-enzyme, and a surfactant. Coagulants used for physic-chemical treatment of wastewater generated in the pulping process are ferric salts, ferrous salts and aluminum salts with sulfate radicals. The pH value of the wastewater subjected to physic-chemical treatment is regulated by CaO or Ca(OH)2, and then all the wastewater is recycled in a pulping system.
Description
Technical field
The present invention relates to a kind of pulping and papermaking method, relate in particular to a kind of pulping process of wastewater zero discharge.
Background technology
China's paper industry is faced with the problem of environmental pollution that water resource lacks and waste discharge brings, and is seriously restricting the development of industry, so the few discharge of wastewater of development is until the pulping process of non-wastewater discharge becomes the industry common recognition.
The present non-deinking pulping process of various waste paper and the pure mechanical feedback of each plant fiber raw material at present, although pulping process need not add various chemical agents, but need to add a large amount of inorganic coagulants in the materialization processing procedure of water treatment, for the accumulation problem of the various zwitterions that solve inorganic coagulant also will be to waste discharge in environment.
APMP (abbreviation of Alkaline Peroxide Mechanical Pulp) pulping technique is first elected in working as that present various high yield bleaching pulping technique has fewer environmental impacts, and is the bleaching effect that guarantees hydrogen peroxide, and domestic each producer almost all adopts NaOH, Na at present
2SiO
3, EDTA etc. is as the bleaching additive, (general slurry per ton produces 20M to a small amount of waste water that produces in pulping process
3The waste water processed of left and right) through one-level precipitation, anaerobic biological, aerobic biochemical, qualified discharge after materialization is processed again, although its colourity of waste water that existing water technology was processed can reach the standard of reuse fully, but due to wherein accumulation meeting heavy corrosion slurrying and the follow-up paper making equipment of sodium salt, so can only, to environmental emission, cause the waste of water resource and the pollution of environment.For addressing this problem, abroad certain research institution had released in recent years with MgO or Mg (OH)
2Change for NaOH, Na
2SiO
3, EDTA patented technology, and obtained in actual applications success, show that the COD content in waste water has descended more than 50%, the effect that cost for wastewater treatment descends greatly.But in wastewater treatment process because needs add various inorganic coagulants, for the accumulation that prevents coagulant equally will be to waste discharge in environment.
No matter the production method of existing deinking bleached pulp, be deinking process or bleaching process, all will add a large amount of Na that contains
+Inorganic and the organic compound of ion, for preventing Na
+The accumulation of ion, the waste water after processing also will discharge, and has not only wasted water resource, and has caused environmental pollution.
Summary of the invention
Technical problem to be solved by this invention is to provide and a kind ofly can solves pulp quality, can realize again the pulping process of wastewater zero discharge.
The present invention completes as follows: a kind of pulping process of wastewater zero discharge is characterized in that: pulping process medicament used mostly is Mg (OH) most
2Or MgO, H
2SO
4, CaO or Ca (OH)
2, H
2O
2, O
2, O
3, biology enzyme, surfactant.It is molysite, ferrous salt, the aluminium salt of sulfate radical that the waste water physicochemical that produces in pulping process is processed coagulant used.After materialization is processed again with CaO or Ca (OH)
2After the pH value of adjusting waste water, fully recovering is in pulping system.
As a kind of improvement, in described pulping process, medicament used is Mg (OH)
2Or MgO, H
2O
2, biology enzyme, surfactant.It is molysite, ferrous salt, the aluminium salt of sulfate radical that the waste water physicochemical that produces in pulping process is processed coagulant used.After materialization is processed again with CaO or Ca (OH)
2After the pH value of adjusting waste water, fully recovering is in pulping system.
As a kind of improvement, in described pulping process, medicament used is Mg (OH)
2Or MgO, H
2O
2It is molysite, ferrous salt, the aluminium salt of sulfate radical that the waste water physicochemical that produces in pulping process is processed coagulant used.After materialization is processed again with CaO or Ca (OH)
2After the pH value of adjusting waste water, fully recovering is in pulping system.
, as a kind of improvement, when described wastewater treatment process need to be regulated pH value, use H
2SO
4Reduce the pH value of waste water, with CaO, Ca (OH)
2Or MgO, Mg (OH)
2Improve the pH value of waste water.
As a kind of improvement, CaO or Ca (OH) that the materialization of described waste water adds after processing
2The total amount of the coagulant that adds with the waste water physicochemical processing procedure of quantity be directly proportional.
As a kind of improvement, the materialization processing procedure of described water treatment adds the H of 1-1000ppm again
2O
2
, as a kind of improvement, add the O of 1-1000ppm in the materialization processing procedure of described water treatment
3
As a kind of improvement, the materialization processing procedure of described water treatment is when the ferrous salt that adopts sulfate radical during as coagulant, and the materialization processing procedure adds the H of 1-1000ppm again
2O
2
As a kind of improvement, the materialization processing procedure of described water treatment during as coagulant, adds the O of 1-1000ppm when the ferrous salt that adopts sulfate radical in the materialization processing procedure
3
The specific embodiment
Embodiment one:
Poplar, by section, washing, sub-wire, Mg (OH) with 4%
2Add 5% H
2O
2Be diluted to 2% concentration after defibrination in 2.5 hours in bleaching under the temperature of 75 ℃, 25% concentration, the sieve that stitches as 0.15mm by sieve screens, the bits that sift out are regrinded after being concentrated into 25% concentration, concentrate the waste water that gets off and be directly used in the washing of wood chip, the wood chip washing waste water processing of anhydrating; The waste water that wash engine gets off is all for the dilution of preceding working procedure high consistency stock, and the waste water that developing machine gets off adds FeSO through Anaerobic Treatment remove the SS of about 50% left and right after preliminary sedimentation after
4Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, be residual Fe in anti-locking system
++The impact of ion pair pulping bleaching process,, simultaneously also for waste water is further decoloured, add the H of 150ppm
2O
2With Fe
++Ion-oxygen changes into Fe
+++Ion and produce water-fast Fe (OH)
3Precipitation, then add the high polymer coagulant PAM of 5ppm to carry out Separation of Solid and Liquid, the primary water of separating adds Ca (OH)
2Regulate fully recovering behind pH value to 7.5 left and right.
Embodiment two:
Poplar, by section, washing, sub-wire, Mg (OH) with 4%
2Add 5% H
2O
2Be diluted to 2% concentration after defibrination in 2.5 hours in bleaching under the temperature of 75 ℃, 25% concentration, the sieve that stitches as 0.15mm by sieve screens, the bits that sift out are regrinded after being concentrated into 25% concentration, concentrate the waste water that gets off and be directly used in the washing of wood chip, the wood chip washing waste water processing of anhydrating; The waste water that wash engine gets off is all for the dilution of preceding working procedure high consistency stock, and the waste water that developing machine gets off directly adds Al
2(SO
4)
3Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, unnecessary Al in system
+++Ion is together with OH
-Ion generates Al (OH)
3Precipitation, then add the high polymer coagulant PAM of 5ppm to carry out Separation of Solid and Liquid, the primary water of separating adds Ca (OH)
2Regulate fully recovering behind pH value to 7.5 left and right.
Embodiment three:
Wheat straw, by cut-out, washing, sub-wire, Mg (OH) with 4%
2Add 5% H
2O
22.5 hours waste wash liquors with later process of bleaching wash and are concentrated to concentration 25% under the temperature of 75 ℃, 25% concentration, add 2% Mg (OH) simultaneously again
2With 5% H
2O
2At the defibrination after 2.5 hours of bleaching at 75 ℃ of temperature, be diluted to 2% concentration and stitch as the sieve of 0.15mm screens by sieve, the bits that sift out are regrinded after being concentrated into 25% concentration, concentrate the waste water that gets off and be directly used in the washing of blade, the processing of anhydrating of blade washes; The waste water that wash engine gets off is all for the dilution of preceding working procedure high consistency stock, adds FeSO through Anaerobic Treatment, Aerobic Process for Treatment, two heavy aerobic bacterial classifications after reclaiming after the SS of the waste water that developing machine gets off through removing about 50% left and right after preliminary sedimentation
4Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, be residual Fe in anti-locking system
++The impact of ion pair pulping bleaching process, simultaneously also for waste water is further decoloured, then add the H of 200ppm
2O
2With Fe
++Ion-oxygen changes into Fe
+++Ion and produce water-fast Fe (OH)
3Precipitation, then add the high polymer coagulant PAM of 10ppm to carry out Separation of Solid and Liquid, the primary water of separating adds Ca (OH)
2Regulate fully recovering behind pH value to 7.5 left and right.
Embodiment four:
Wheat straw, by cut-out, washing, sub-wire, Mg (OH) with 4%
2Add 5% H
2O
22.5 hours waste wash liquors with later process of bleaching wash and are concentrated to concentration 25% under the temperature of 75 ℃, 25% concentration, add 2% Mg (OH) simultaneously again
2With 5% H
2O
2At the defibrination after 2.5 hours of bleaching at 75 ℃ of temperature, be diluted to 2% concentration and stitch as the sieve of 0.15mm screens by sieve, the bits that sift out are regrinded after being concentrated into 25% concentration, concentrate the waste water that gets off and be directly used in the washing of blade, the processing of anhydrating of blade washes; The waste water that wash engine gets off is all for the dilution of preceding working procedure high consistency stock, and the waste water that developing machine gets off directly adds Fe
2(SO
4)
3Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, the Fe in waste water
+++Ion is together with OH
-Ion generates water-fast Fe (OH)
3The precipitation, after add again the high polymer coagulant PAM of 10ppm to carry out Separation of Solid and Liquid, the primary water of separating adds Ca (OH)
2Regulate fully recovering behind pH value to 7.5 left and right.
Embodiment five:
The imported from America wastepaper, in 15% concentration, at 50 ℃ of temperature, pulping is 30 minutes, adds the enzymatic deinking agent of relative over dry waste paper 250ppm and the OPEO [C of 200ppm in the pulping process
8H
17-
-O (CH
2CH
2O)
10H], use the By Bubble-floating Method deinking through after slagging-off screening, rear pulp washing, be concentrated into 25% concentration, add 0.4% Mg (OH)
2With 0.8% H
2O
2Bleaching is 1.5 hours at 75 ℃ of temperature, and the waste water that the pulp washing process produces adds Al
2(SO
4)
3Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, and unnecessary Al in system
+++Ion is together with OH
-Ion generates Al (OH)
3Precipitation, then add the high polymer coagulant PAM of 5ppm to carry out Separation of Solid and Liquid, the primary water of separating adds Ca (OH)
2Regulate fully recovering behind pH value to 7 left and right.
Embodiment six:
Domestic useless books paper, in 15% concentration, at 50 ℃ of temperature, pulping is 25 minutes, adds the enzymatic deinking agent of relative over dry waste paper 250ppm and the OPEO [C of 200ppm in the pulping process
8H
17-
-O (CH
2CH
2O)
10H], use the By Bubble-floating Method deinking through after slagging-off screening, rear pulp washing, be concentrated into 25% concentration, add 0.4% Mg (OH)
2With 0.8% H
2O
2Bleaching is 1.5 hours at 75 ℃ of temperature, and the waste water that the pulp washing process produces adds FeSO
4Coagulating treatment, then add the H of 150ppm
2O
2, with Fe
++Be oxidized to Fe
+++, make Fe
+++Generate water-fast Fe (OH)
3Carry out Separation of Solid and Liquid, rear supernatant adds CaO or Ca (OH)
2Regulate fully recovering behind pH value to 7 left and right.
Embodiment seven:
Poplar, by section, washing, sub-wire, defibrination, screening, concentrated, the concentrated waste water that produces removes chip washing, the waste water that chip washing the produces processing of anhydrating, waste water adds FeSO through Aerobic Process for Treatment remove the SS of about 50% left and right after preliminary sedimentation after
4Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, then adding the high polymer coagulant PAM of 5ppm to carry out Separation of Solid and Liquid, the primary water of separating adds Ca (OH)
2Regulate fully recovering behind pH value to 7.5 left and right.
Embodiment eight:
Waste and old boxboard, by pulping, screening, purification, concentrated, the processing of anhydrating of the waste water of generation.Waste water is removed after the SS of about 80% left and right through aerobic treatment after preliminary sedimentation, then adds FeSO
4Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, then adding the high polymer coagulant PAM of 5ppm to carry out Separation of Solid and Liquid, the primary water of separating adds Ca (OH)
2Regulate fully recovering behind pH value to 7 left and right.
Embodiment nine:
The poplar sheet, by sub-wire, defibrination, screening, concentrated, the processing of anhydrating of the waste water of generation.Waste water is removed after the SS of about 80% left and right through aerobic treatment after preliminary sedimentation, then adds FeSO
4Carry out coagulating treatment, regulate pH value＜7, then add the H of 150ppm
2O
2, with Fe
++Be oxidized to Fe
+++, make Fe
+++Generate water-fast Fe (OH)
3Carry out Separation of Solid and Liquid, the supernatant of separating adds CaO or Ca (OH)
2Regulate fully recovering behind pH value to 7 left and right.
Claims (6)
1. the pulping process of a wastewater zero discharge, is characterized in that, comprises the steps:
(1) poplar, by section, washing, sub-wire, Mg (OH) with 4%
2Add 5% H
2O
2Be diluted to 2% concentration after defibrination in 2.5 hours in bleaching under the temperature of 75 ℃, 25% concentration, the sieve that stitches as 0.15mm by sieve screens, the bits that sift out are regrinded after being concentrated into 25% concentration, concentrate the waste water that gets off and be directly used in the washing of wood chip, the wood chip washing waste water processing of anhydrating; The waste water that wash engine gets off is all for the dilution of preceding working procedure high consistency stock;
(2) the described waste water processed of anhydrating of step (1) adds FeSO through Anaerobic Treatment remove 50% ss suspended solid after preliminary sedimentation after
4Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, be residual Fe in anti-locking system
++The impact of ion pair pulping bleaching process,, simultaneously also for waste water is further decoloured, add the H of 150ppm
2O
2With Fe
++Ion-oxygen changes into Fe
+++Ion and produce water-fast Fe (OH)
3Precipitation, then add the high polymer coagulant PAM of 5ppm to carry out Separation of Solid and Liquid;
(3) the described Separation of Solid and Liquid of step (2) primary water out adds Ca (OH)
2Regulate the rear fully recovering of pH value to 7.5.
2. the pulping process of a wastewater zero discharge, is characterized in that, comprises the steps:
(1) poplar, by section, washing, sub-wire, Mg (OH) with 4%
2Add 5% H
2O
2Be diluted to 2% concentration after defibrination in 2.5 hours in bleaching under the temperature of 75 ℃, 25% concentration, the sieve that stitches as 0.15mm by sieve screens, the bits that sift out are regrinded after being concentrated into 25% concentration, concentrate the waste water that gets off and be directly used in the washing of wood chip, the wood chip washing waste water processing of anhydrating; The waste water that wash engine gets off is all for the dilution of preceding working procedure high consistency stock;
(2) the described waste water of processing that anhydrates of step (1) directly adds Al
2(SO4)
3Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, unnecessary Al in system
+++Ion is together with OH
-Ion generates Al (OH)
3Precipitation, then add the high polymer coagulant PAM of 5ppm to carry out Separation of Solid and Liquid;
(3) the described Separation of Solid and Liquid of step (2) primary water out adds Ca (OH)
2Regulate the rear fully recovering of pH value to 7.5.
3. the pulping process of a wastewater zero discharge, is characterized in that, comprises the steps:
(1) wheat straw, by cut-out, washing, sub-wire, Mg (OH) with 4%
2Add 5% H
2O
2Bleaching is 2.5 hours under the temperature of 75 ℃, 25% concentration, with the waste wash liquor of later process, washs and be concentrated to concentration 25%, adds 2% Mg (OH) simultaneously again
2With 5% H
2O
2At the defibrination after 2.5 hours of bleaching at 75 ℃ of temperature, be diluted to 2% concentration and stitch as the sieve of 0.15mm screens by sieve, the bits that sift out are regrinded after being concentrated into 25% concentration, concentrate the waste water that gets off and be directly used in the washing of blade, the processing of anhydrating of blade washes; The waste water that wash engine gets off is all for the dilution of preceding working procedure high consistency stock;
(2) described the anhydrating of step (1) processed waste water through adding FeSO through Anaerobic Treatment, Aerobic Process for Treatment, two heavy aerobic bacterial classifications after reclaiming after the ss suspended solid of removal 50% after preliminary sedimentation
4Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, be residual Fe in anti-locking system
++The impact of ion pair pulping bleaching process, simultaneously also for waste water is further decoloured, then add the H of 200ppm
2O
2With Fe
++Ion-oxygen changes into Fe
+++Ion and produce water-fast Fe (OH)
3Precipitation, then add the high polymer coagulant PAM of 10ppm to carry out Separation of Solid and Liquid;
(3) the described Separation of Solid and Liquid of step (2) primary water out adds Ca (OH)
2Regulate the rear fully recovering of pH value to 7.5.
4. the pulping process of a wastewater zero discharge, is characterized in that, comprises the steps:
(1) wheat straw, by cut-out, washing, sub-wire, Mg (OH) with 4%
2Add 5% H
2O
2Bleaching is 2.5 hours under the temperature of 75 ℃, 25% concentration, with the waste wash liquor of later process, washs and be concentrated to concentration 25%, adds 2% Mg (OH) simultaneously again
2With 5% H
2O
2At the defibrination after 2.5 hours of bleaching at 75 ℃ of temperature, be diluted to 2% concentration and stitch as the sieve of 0.15mm screens by sieve, the bits that sift out are regrinded after being concentrated into 25% concentration, concentrate the waste water that gets off and be directly used in the washing of blade, the processing of anhydrating of blade washes; The waste water that wash engine gets off is all for the dilution of preceding working procedure high consistency stock;
(2) the described waste water of processing that anhydrates of step (1) directly adds Fe
2(SO4)
3Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, the Fe in waste water
+++Ion is together with OH
-Ion generates water-fast Fe (OH)
3The precipitation, after add again the high polymer coagulant PAM of 10ppm to carry out Separation of Solid and Liquid;
(3) described Separation of Solid and Liquid primary water out adds Ca (OH)
2Regulate the rear fully recovering of pH value to 7.5.
5. the pulping process of a wastewater zero discharge, is characterized in that, comprises the steps:
(1) imported from America wastepaper, in 15% concentration, at 50 ℃ of temperature, pulping is 30 minutes, add in the pulping process enzymatic deinking agent of relative over dry waste paper 250ppm and the OPEO of 200ppm [
], use the By Bubble-floating Method deinking through after slagging-off screening, rear pulp washing, be concentrated into 25% concentration, add 0.4% Mg (OH)
2With 0.8% H
2O
2Bleaching is 1.5 hours at 75 ℃ of temperature;
(2) waste water of the described pulp washing process generation of step (1) adds Al
2(SO
4)
3Carry out coagulating treatment, regulate pH value＜7, sulfate ion unnecessary in this moment system is together with Ca remaining in its system
++Ion generates water-fast CaSO
4, and unnecessary Al in system
+++Ion is together with OH
-Ion generates Al (OH)
3Precipitation, then add the high polymer coagulant PAM of 5ppm to carry out Separation of Solid and Liquid;
(3) the described Separation of Solid and Liquid of step (2) primary water out adds Ca (OH)
2Regulate the rear fully recovering of pH value to 7.
6. the pulping process of a wastewater zero discharge, is characterized in that, comprises the steps:
(1) domestic useless books paper, in 15% concentration, at 50 ℃ of temperature, pulping is 25 minutes, add in the pulping process enzymatic deinking agent of relative over dry waste paper 250ppm and the OPEO of 200ppm [
], use the By Bubble-floating Method deinking through after slagging-off screening, rear pulp washing, be concentrated into 25% concentration, add 0.4% Mg (OH)
2With 0.8% H
2O
2Bleaching is 1.5 hours at 75 ℃ of temperature;
(2) waste water of the described pulp washing process generation of step (1) adds FeSO
4Coagulating treatment, then add the H of 150ppm
2O
2, with Fe
++Be oxidized to Fe
+++, make Fe
+++Generate water-fast Fe (OH)
3Carry out Separation of Solid and Liquid;
(3) add CaO or Ca (OH) in the described Separation of Solid and Liquid of step (2) supernatant out
2Regulate the rear fully recovering of pH value to 7.
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|---|---|---|---|
| CN2009102168720A CN102108650B (en) | 2009-12-29 | 2009-12-29 | Zero-wastewater-emission pulping method |
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|---|---|---|---|
| CN2009102168720A CN102108650B (en) | 2009-12-29 | 2009-12-29 | Zero-wastewater-emission pulping method |
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| CN102108650B true CN102108650B (en) | 2013-11-20 |
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| AT511978B1 (en) * | 2011-10-04 | 2013-06-15 | Andritz Ag Maschf | METHOD AND DEVICE FOR THE ENERGY EFFICIENT RESOLUTION OF FIBROUS MATERIALS USING HEAT PUMP SYSTEMS |
| CN105735025A (en) * | 2014-12-11 | 2016-07-06 | 广东轻工职业技术学院 | Hydrogen peroxide bleaching method of waste paper deinking pulp using magnesium-based alkali |
| CN105986498A (en) * | 2015-02-16 | 2016-10-05 | 李�昊 | Technological method for achieving zero discharge of alkaline pulping waste water containing sodium or potassium |
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2009
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| CN1361328A (en) * | 2000-12-25 | 2002-07-31 | 李风宁 | Technological process capable of reusing digestion blank liquor in alkali paper pulp making |
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