CN102849916A - Dewatering method for papermaking sludge - Google Patents
Dewatering method for papermaking sludge Download PDFInfo
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- CN102849916A CN102849916A CN2012103808340A CN201210380834A CN102849916A CN 102849916 A CN102849916 A CN 102849916A CN 2012103808340 A CN2012103808340 A CN 2012103808340A CN 201210380834 A CN201210380834 A CN 201210380834A CN 102849916 A CN102849916 A CN 102849916A
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Abstract
The invention discloses a dewatering method for papermaking sludge. The dewatering method is characterized in that the papermaking sludge is dewatered by an electroosmosis device, and the removed wastewater is added into papermaking sludge to be dewatered, so that the dewatering rate of the electroosmosis can be improved; and the electroosmosis device comprises an positive cylinder groove and a negative cylinder groove which reversely rotate mutually, and the papermaking sludge rotates along the rotation directions of the positive cylinder groove and the negative cylinder groove, and passes between the positive cylinder groove and the negative cylinder groove. According to the dewatering method, the papermaking sludge is dewatered in combination with mechanical dewatering and electroosmosis dewatering, so that the water content of the papermaking sludge can be directly reduced to be less than 39%; the device is small in floor space, so that the position and the technical size can be flexibly changed according to the production requirement; and the treated papermaking sludge can be directly burnt.
Description
Technical field
The present invention relates to a kind of dehydration technique of paper mill sludge, belong to pulp technology for making paper.
Background technology
Mud is the end product of paper-making process wastewater treatment, and one ton of recycled writing paper of every production just produces the approximately mud 700Kg of water content 65%, and output is 5～10 times of same size municipal wastewater treatment plant, and complicated, and water content is high, and intractability is large.Especially in recent years, the paper of China and the output of cardboard leap to the first in the world, so the disposal of paper mill sludge has become the major issue of constraint paper mill development.Studies show that, the contained biomass content of paper mill sludge is abundant, and organic content approximately 40%～50% mainly contains a large amount of Mierocrystalline celluloses, polymer organism and the fillers such as hemicellulose and xylogen, and flocculation agent etc., and do not contain heavy metal, be a kind of biomass resource.After paper mill sludge effectively processed, it can be turned waste into wealth, become renewable resources, environmental contamination reduction and harm.
And the paper mill sludge water content is higher, generally up to more than 90%; Moisture in the paper mill sludge mainly is divided into interstitial water, capillary water, planar water and in conjunction with the water Four types, wherein interstitial water accounts for about 70% of mud total water content.Use traditional mechanical sludge dewatering method, the water ratio in the mud can only be reduced to about 70%, a large amount of interstitial waters contained in the mud can't remove, and dewatering efficiency is lower.At present, the mud in most paper mills mainly is by behind the mechanical dehydration it directly being carried out landfill, also having formed the wasting of resources in the time of to environment.Therefore, study the dehydration technique that is applicable to paper mill sludge and just seem extremely urgent.
Summary of the invention
Technical problem to be solved by this invention is: the shortcoming of customer service prior art, a kind of production method that can effectively remove the moisture content in the paper mill sludge is provided, and improve dewatering efficiency.
In order to achieve the above object, the invention provides a kind of dewatering process of paper mill sludge, it is characterized in that, paper mill sludge is dewatered by electrodialysis unit, and the waste water that removes joins in the paper mill sludge to be drained off, improves electrodialytic dehydration rate;
Described electrodialysis unit comprises anodal round cylinder slot, the negative pole round cylinder slot of mutual retrograde rotation, and paper mill sludge passes through between anodal round cylinder slot, negative pole round cylinder slot along the sense of rotation of anodal round cylinder slot, negative pole round cylinder slot.
Preferably, the current density of described electrodialysis unit is that current density is 100～1000A/m
2。
Preferably, the rotating speed of described anodal round cylinder slot, negative pole round cylinder slot is 1～5rpm.
Preferably, described anodal round cylinder slot is reticulated structure.
Preferably, described negative pole round cylinder slot is netted or sheet structure.
Preferably, the add-on of the described waste water that removes is for adding 1～10% of paper mill sludge gross weight to be drained off behind the waste water.
Characteristics of the present invention are: because extrusion dehydration mainly is to use the principle of mechanical dehydration that the free water in the mud is removed, and contained a large amount of interstitial waters use traditional mechanical dehydration method to remove in the paper mill sludge, therefore use electroosmose process interstitial water wherein further can be removed.
The present invention compares with traditional mud dewatering method also has following advantage:
1, the present invention uses the mode of simultaneously combination of mechanical dehydration and electrodialysis dehydration that paper mill sludge is dewatered, and can be directly the water ratio of paper mill sludge be reduced to below 39%;
2, the present invention uses cylindrical charged container that paper mill sludge is dewatered, and this plant area area is little, can be according to need of production, and flexible changing position and process;
3, the paper mill sludge water ratio after the use process equipment provided by the present invention is low, and calorific value is high, can be directly as purposes such as boiler burnings.
Description of drawings
Fig. 1 is the structural representation for the electrodialysis unit of the dewatering of paper mill sludge provided by the invention.Among the figure:
1, arrow one; 2, arrow two; 3, arrow three;
4, anodal round cylinder slot; 5, negative pole round cylinder slot; 6, slush-pit launder.
Embodiment
For the present invention is become apparent, hereby with preferred embodiment, and cooperate accompanying drawing to be described in detail below.
Embodiment 1
As shown in Figure 1, be the structural representation of the electrodialysis unit of the dewatering that is used for paper mill sludge provided by the invention, comprise anodal round cylinder slot 4, the negative pole round cylinder slot 5 of mutual retrograde rotation, anodal round cylinder slot 4 is reticulated structure, and negative pole round cylinder slot 5 is reticulated structure.Be provided with slush-pit launder 6 between anodal round cylinder slot 4, the negative pole round cylinder slot 5.
Paper mill sludge is placed slush-pit launder 6, pass into electric field after, the rotating speed of anodal round cylinder slot 4, negative pole round cylinder slot 5 all is adjusted to 1rpm, current density is 100A/m
2, paper mill sludge passes through between anodal round cylinder slot 4, negative pole round cylinder slot 5, shown in the direction of arrow among Fig. 11 along the sense of rotation of anodal round cylinder slot 4, negative pole round cylinder slot 5.The paper mill sludge 3 that is dewatering is squeezed and dewaters and the electrodialysis dehydration.The waste water that the removes direction of arrow 22 in Fig. 1 is joined in the paper mill sludge to be drained off, and the weight percent that the waste water of adding accounts for paper mill sludge to be drained off is 1%, and the water ratio of the rear mud cake that obtains dewatering is 38%.
Difference from Example 1 is, anodal round cylinder slot 4 is reticulated structure, and negative pole round cylinder slot 5 is sheet structure.The rotating speed of anodal round cylinder slot 4, negative pole round cylinder slot 5 is 2rpm, and current density is 200A/m
2, the waste water add-on that removes is: the weight percent that accounts for paper mill sludge to be drained off is 3%.The water ratio of mud cake is 35% after the dehydration.
Embodiment 3
Difference from Example 1 is, anodal round cylinder slot 4 is reticulated structure, and negative pole round cylinder slot 5 is reticulated structure.The rotating speed of anodal round cylinder slot 4, negative pole round cylinder slot 5 is 3rpm, and current density is 500A/m
2, the waste water add-on that removes is: the weight percent that accounts for paper mill sludge to be drained off is 5%.The water ratio of mud cake is 30% after the dehydration.
Embodiment 4
Difference from Example 1 is, anodal round cylinder slot 4 is reticulated structure, and negative pole round cylinder slot 5 is sheet structure.The rotating speed of anodal round cylinder slot 4, negative pole round cylinder slot 5 is 4rpm, and current density is 800A/m
2, the waste water add-on that removes is: the weight percent that accounts for paper mill sludge to be drained off is 7%.The water ratio of mud cake is 35.6% after the dehydration.
Difference from Example 1 is, anodal round cylinder slot 4 is reticulated structure, and negative pole round cylinder slot 5 is sheet structure.The rotating speed of anodal round cylinder slot 4, negative pole round cylinder slot 5 is 5rpm, and current density is 1000A/m
2, the waste water add-on that removes is: the weight percent that accounts for paper mill sludge to be drained off is 10%.The water ratio of mud cake is 29% after the dehydration.
Claims (6)
1. the dewatering process of a paper mill sludge is characterized in that, paper mill sludge is dewatered by electrodialysis unit, and the waste water that removes joins in the paper mill sludge to be drained off, improves electrodialytic dehydration rate;
Described electrodialysis unit comprises anodal round cylinder slot (4), the negative pole round cylinder slot (5) of mutual retrograde rotation, paper mill sludge passes through between (5) from anodal round cylinder slot (4), negative pole round cylinder slot along the sense of rotation of anodal round cylinder slot (4), negative pole round cylinder slot (5).
2. the dewatering process of a kind of paper mill sludge according to claim 1 is characterized in that, the current density of described electrodialysis unit is that current density is 100～1000A/m
2.。
3. the dewatering process of a kind of paper mill sludge according to claim 1 is characterized in that, the rotating speed of described anodal round cylinder slot (4), negative pole round cylinder slot (5) is 1～5rpm.
4. the dewatering process of a kind of paper mill sludge according to claim 1 is characterized in that, described anodal round cylinder slot (4) is reticulated structure.
5. the dewatering process of a kind of paper mill sludge according to claim 1 is characterized in that, described negative pole round cylinder slot (5) is netted or sheet structure.
6. the dewatering process of a kind of paper mill sludge according to claim 1 is characterized in that, the add-on of the described waste water that removes is for having added 1～10% of paper mill sludge gross weight to be drained off behind the waste water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103808340A CN102849916A (en) | 2012-10-09 | 2012-10-09 | Dewatering method for papermaking sludge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103808340A CN102849916A (en) | 2012-10-09 | 2012-10-09 | Dewatering method for papermaking sludge |
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| CN102849916A true CN102849916A (en) | 2013-01-02 |
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| CN2012103808340A Pending CN102849916A (en) | 2012-10-09 | 2012-10-09 | Dewatering method for papermaking sludge |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103332844A (en) * | 2013-07-05 | 2013-10-02 | 浙江科力尔环保设备有限公司 | Electroosmosis sludge dewatering equipment |
| CN103332841A (en) * | 2013-07-05 | 2013-10-02 | 浙江科力尔环保设备有限公司 | Electroosmosis sludge dewatering equipment |
| CN103787568A (en) * | 2014-02-24 | 2014-05-14 | 南京赛佳环保实业有限公司 | Anode for electroosmosis sludge dewatering equipment and manufacturing technology thereof |
| CN104150740A (en) * | 2014-08-11 | 2014-11-19 | 中山大学 | Two-pool sludge dehydration technology through vacuum pre-compression combined electroosmosis |
| CN105330116A (en) * | 2014-08-04 | 2016-02-17 | 昆山美淼环保科技有限公司 | Sludge pretreatment method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87101602A (en) * | 1986-07-14 | 1988-01-27 | 株式会社荏原制作所 | Dewatering and equipment |
| JPH01189311A (en) * | 1988-01-25 | 1989-07-28 | Fuji Electric Co Ltd | Electroosmotic dehydrator |
| JPH1189311A (en) * | 1997-09-22 | 1999-04-06 | Kubota Corp | Wheel rut-eliminating device of paddy field work machine |
| WO2011081053A1 (en) * | 2009-12-28 | 2011-07-07 | 栗田工業株式会社 | Electrification treatment method and apparatus, and anode therefor |
| CN102361829A (en) * | 2009-03-30 | 2012-02-22 | 栗田工业株式会社 | Method for dewatering sludge and method and device for electroosmotic dewatering |
-
2012
- 2012-10-09 CN CN2012103808340A patent/CN102849916A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87101602A (en) * | 1986-07-14 | 1988-01-27 | 株式会社荏原制作所 | Dewatering and equipment |
| JPH01189311A (en) * | 1988-01-25 | 1989-07-28 | Fuji Electric Co Ltd | Electroosmotic dehydrator |
| JPH1189311A (en) * | 1997-09-22 | 1999-04-06 | Kubota Corp | Wheel rut-eliminating device of paddy field work machine |
| CN102361829A (en) * | 2009-03-30 | 2012-02-22 | 栗田工业株式会社 | Method for dewatering sludge and method and device for electroosmotic dewatering |
| WO2011081053A1 (en) * | 2009-12-28 | 2011-07-07 | 栗田工業株式会社 | Electrification treatment method and apparatus, and anode therefor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103332844A (en) * | 2013-07-05 | 2013-10-02 | 浙江科力尔环保设备有限公司 | Electroosmosis sludge dewatering equipment |
| CN103332841A (en) * | 2013-07-05 | 2013-10-02 | 浙江科力尔环保设备有限公司 | Electroosmosis sludge dewatering equipment |
| CN103787568A (en) * | 2014-02-24 | 2014-05-14 | 南京赛佳环保实业有限公司 | Anode for electroosmosis sludge dewatering equipment and manufacturing technology thereof |
| CN105330116A (en) * | 2014-08-04 | 2016-02-17 | 昆山美淼环保科技有限公司 | Sludge pretreatment method |
| CN104150740A (en) * | 2014-08-11 | 2014-11-19 | 中山大学 | Two-pool sludge dehydration technology through vacuum pre-compression combined electroosmosis |
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