CN105084702A - Deep dehydration method for wax-recovered sludge in wax printing waste water - Google Patents
Deep dehydration method for wax-recovered sludge in wax printing waste water Download PDFInfo
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- CN105084702A CN105084702A CN201410185619.4A CN201410185619A CN105084702A CN 105084702 A CN105084702 A CN 105084702A CN 201410185619 A CN201410185619 A CN 201410185619A CN 105084702 A CN105084702 A CN 105084702A
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Abstract
The invention discloses a deep dehydration method for wax-recovered sludge in wax printing waste water. The deep dehydration method is characterized by comprising the following steps: predehydration of wax-recovered sludge so as to allow water content of the sludge to decrease to less than 92%; infrared ray heating until sludge temperature is 70 to 90 DEG C; squeezing dehydration for 5 to 60 s; and spray cooling and continuous gravity dehydration until water content of the sludge decreases to less than 30%. The method provided by the invention has a fast sludge dehydration speed and high dehydration efficiency; and the dehydrated sludge has a water content of less than 30% and a small size, thereby facilitating transport and disposal of the sludge.
Description
Technical field
The invention belongs to the sewage in environmental engineering, technical field of sludge treatment, particularly relate to the deep dehydration method that a kind of wax printing waste water wax reclaims mud.
Background technology
Wax printing adopts wax to be the printing method of reserving agent, is manual batik in early days.Machinery batik comes across the Indonesia of late nineteenth century, and full-fledged at present, nineteen nineties imports China into.The production process of wax printing be textiles after pre-treatment, carry out print wax, dye, get rid of wax line, dye wax line, move back the manufacturing procedures such as wax, stamp, aftertreatment.Wax is removed from fabric through moving back wax operation as reserving agent, moves back wax and generally includes machinery and move back wax and wax is moved back in alkali cleaning, create a large amount of content of wax waste water.For machinery move back wax waste water often directly adopt By Bubble-floating Method carry out recovery suspended state wax, wax waste water is moved back for alkali cleaning and often adopts mineral acid acid out method, make wax precipitation after adopt By Bubble-floating Method to carry out recovery suspended state wax again.Two kinds of methods all create a large amount of wax and reclaim mud, general moisture percentage in sewage sludge 96-97%.
Be cotton-shaped particle for this kind of content of wax waste water solid isolated content of wax mud, sludge structure is loose, and water ratio is high, is difficult to further processed.Domesticly adopt whizzer, plate-and-frame filter press to dewater in early days more, efficiency is low, continuous prodution can not be carried out, conventional belt is adopted to roll filter dehydration or horizontal screw centrifuge dehydration, although can continuous seepage be realized, dewatered solids moisture percentage in sewage sludge is higher (general water ratio more than 75%) still, and sludge volume is large, is unfavorable for the recycling of recycling wax.Although plate-and-frame filter press filter-press dehydration mud dewatered sludge water ratio is low, can only batch production, operation bothers, and filter cloth easily blocks, and need often clean.
Summary of the invention
The object of the present invention is to provide a kind of wax printing waste water wax to reclaim the deep dehydration method of mud, realize the high-efficiency dehydration of content of wax mud.
For achieving the above object, technological method of the present invention is:
Wax printing waste water wax reclaims a deep dehydration method for mud, comprises the following steps:
Step a. wax reclaims mud and collects rear predrainage, makes moisture percentage in sewage sludge be reduced to less than 92%;
Step b. predrainage mud infrared heating, makes mud be rapidly heated to 70-90 DEG C, and mud is softening to be shunk and dewaters;
Step c press dewatering, deviates from water and wax and reclaims sludge hot and exchange, preheating mud;
Steps d. strainer water-spraying control bottom mud, makes mud lower surface temperature be cooled to 30-65 DEG C, continues gravity dehydration and is reduced to less than 30% to moisture percentage in sewage sludge;
Step e. scrapes block mud on lower filter belt, enters Sewage treatment systems after de-effluent collection.
In described step a, predrainage refers to the combined dehydration method or the gravity dehydration that adopt gravity dehydration or the combined dehydration method of dewatering with gravity dehydration vacuum take-off or gravity dehydration and press dewatering and vacuum take-off dewaters and the combined dehydration method of press dewatering.
In described step b, mud temperature is 70-90 DEG C.
The described step c press dewatering time is 5-60s.
In described steps d water coolant utilize with sludge hot exchange after deviate from water; Spray water coolant makes mud lower surface temperature be cooled to 30-65 DEG C, is beneficial to and strikes off from strainer.
Ultimate principle of the present invention is:
Main component in this kind of wastewater from wax printing is saponification rosin-cerate, defines water-fast sylvic acid after waste water acid adding acid out, forms throw out, create a large amount of mud together with other pollution substances.The softening temperature of this kind of sylvic acid is about 75 DEG C, and when being heated to more than 70 DEG C, the sylvic acid molecule in mud starts to soften, and wrap up other hydrophobic contaminant matter, automatically shrink by Van der Waals force, hydrogen bond, intermolecular cohesion, make molecule combine closely, release is in conjunction with moisture.Present invention utilizes the characteristic of sylvic acid by thermal softening, contraction, shrink rapidly by convergent force poly-in mud and internal moisture squeezed out and dewater, cooling forms block mud, and dewatering speed is exceedingly fast.
Beneficial effect:
A. this kind of wax printing waste water wax recovery mud dewaters through this inventive method, and dewatering speed is fast, and dewatering efficiency is high, and dewatered sludge water ratio, lower than 30%, far below conventional dehydration methods, and can realize continuous prodution process;
B. dewatered sludge compact structure, in lump shape, sludge volume is little, is convenient to transport and recycles.
Accompanying drawing explanation
Fig. 1 is processing technological flow schematic diagram of the present invention.
Embodiment
Embodiment 1 is with reference to Fig. 1.
The invention provides the deep dehydration method that a kind of wax printing waste water wax reclaims mud.Air supporting mud carries out predrainage after collecting, and then carries out infrared heating deep dehydration.Mud to heat up post softening through infrared heating, and shrink and assemble and deviate from moisture, form the lump shape mud of compact structure after water-spraying control, water ratio can be reduced to less than 30%, and volume reduces, and is easy to transport and recycling.Concrete reference accompanying drawing 1 is illustrated.
Wax reclaims mud and collects rear predrainage, makes moisture percentage in sewage sludge be reduced to 90%; Predrainage mud enters infrared heating drying zone and carries out infrared heating, mud is made to be rapidly heated to 88 DEG C, to strainer spray water coolant bottom mud after squeezing gravity dehydration, make mud lower surface temperature be cooled to 60 DEG C, and continue gravity dehydration and be reduced to less than 30% to moisture percentage in sewage sludge; Scrape block mud on lower filter belt, recycle.
The invention provides the deep dehydration method that a kind of wax printing waste water wax reclaims mud, mainly comprise the following steps:
Step a. wax reclaims mud and collects rear predrainage, and predrainage adopts gravity dehydration and vacuum take-off dewaters and the combined dehydration method of press dewatering, makes moisture percentage in sewage sludge be reduced to less than 90%;
Step b. predrainage mud enters infrared heating deep dehydration district and carries out infrared heating, and mud is rapidly heated to 88 DEG C, mud is softened and shrinks and dewater;
Step c press dewatering 20s, deviates from water and wax and reclaims sludge hot and exchange, preheating mud;
Steps d. bottom mud, spray water coolant, make mud lower surface temperature be cooled to 60 DEG C, continue gravity dehydration be reduced to less than 30% to moisture percentage in sewage sludge, water coolant adopt with sludge hot exchange after deviate from water;
Block mud on lower filter belt scraped by step e. scraper, recycles, and enters Sewage treatment systems after de-effluent collection.
Adopt the inventive method process, this kind of wax reclaims sludge dewatering speed soon, and dewatering efficiency is high, and dewatered sludge water ratio, lower than 30%, far below conventional dehydration methods, and can realize continuous prodution process.Dewatered sludge compact structure, in lump shape, sludge volume is little, is convenient to transport and recycles.
Embodiment 2
Wax reclaims mud and collects rear predrainage, makes moisture percentage in sewage sludge be reduced to 92%; Predrainage mud adopts infrared heating, makes mud be rapidly heated to 83 DEG C, to strainer spray water coolant bottom mud after squeezing gravity dehydration, makes mud lower surface temperature be cooled to 60 DEG C, and continues gravity dehydration and be reduced to less than 30% to moisture percentage in sewage sludge; Scrape block mud on lower filter belt, recycle.
The invention provides the deep dehydration method that a kind of wax printing waste water wax reclaims mud, mainly comprise the following steps:
Step a. wax reclaims mud and collects rear predrainage, and predrainage adopts gravity dehydration and vacuum take-off dewaters and the combined dehydration method of press dewatering, makes moisture percentage in sewage sludge be reduced to 92%;
Step b. predrainage mud enters infrared heating deep dehydration district and carries out infrared heating, and mud is rapidly heated to 83 DEG C, mud is softened and shrinks and dewater;
Step c press dewatering 10s, deviates from water and wax and reclaims sludge hot and exchange, preheating mud;
Steps d. bottom mud strainer spray water coolant, make mud lower surface temperature be cooled to 60 DEG C, continue gravity dehydration be reduced to less than 30% to moisture percentage in sewage sludge, water coolant adopt with sludge hot exchange after deviate from water;
Block mud on lower filter belt scraped by step e. scraper, recycles, and enters Sewage treatment systems after de-effluent collection.
Adopt the inventive method process, this kind of wax reclaims sludge dewatering speed soon, and dewatering efficiency is high, and dewatered sludge water ratio, lower than 30%, far below conventional dehydration methods, and can realize continuous prodution process.Dewatered sludge compact structure, in lump shape, sludge volume be only that belt rolls filter filter-press dehydration or centrifuge dewatered sludge volume 1/3 ~ 1/4, be convenient to transport and the recycling of wax.
Claims (5)
1. wax printing waste water wax reclaims a deep dehydration method for mud, comprises the following steps:
Step a. wax reclaims mud and collects rear predrainage, makes moisture percentage in sewage sludge be reduced to less than 92%;
Step b. predrainage mud infrared heating, makes mud be rapidly heated to 70-90 DEG C, softens and shrinks and dewater;
Step c press dewatering 5-60s, deviates from water and wax and reclaims sludge hot and exchange, preheating mud;
Steps d. water-spraying control bottom mud, makes mud lower surface temperature be cooled to 30-65 DEG C, continues gravity dehydration and is reduced to less than 30% to moisture percentage in sewage sludge;
Step e. scrapes block mud on lower filter belt, recycles, and enters Sewage treatment systems after de-effluent collection;
Described water coolant is deviate from water after exchanging with sludge hot.
2. a kind of wax printing waste water wax according to claim 1 reclaims the deep dehydration method of mud, to it is characterized in that in described step a that predrainage refers to combined dehydration method or the gravity dehydration of combined dehydration method or gravity dehydration and the press dewatering adopting gravity dehydration or gravity dehydration and vacuum take-off to dewater and vacuum take-off dewaters and the combined dehydration method of press dewatering.
3. a kind of wax printing waste water wax according to claim 1 reclaims the deep dehydration method of mud, it is characterized in that in described step b, temperature is 70-90 DEG C.
4. a kind of wax printing waste water wax according to claim 1 reclaims the deep dehydration method of mud, it is characterized in that described step b middle infrared (Mid-IR) width of heating is greater than sludge blanket width on strainer.
5. a kind of wax printing waste water wax according to claim 1 reclaims the deep dehydration method of mud, it is characterized in that in described steps d, mud bottom coohng to surface temperature is 30-65 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410185619.4A CN105084702A (en) | 2014-05-05 | 2014-05-05 | Deep dehydration method for wax-recovered sludge in wax printing waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410185619.4A CN105084702A (en) | 2014-05-05 | 2014-05-05 | Deep dehydration method for wax-recovered sludge in wax printing waste water |
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| CN105084702A true CN105084702A (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410185619.4A Pending CN105084702A (en) | 2014-05-05 | 2014-05-05 | Deep dehydration method for wax-recovered sludge in wax printing waste water |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1158750A (en) * | 1995-12-21 | 1997-09-10 | 潘尼维斯公司 | Device for filtering, washing and drying solid material-liquid mixture |
| CN101708944A (en) * | 2009-12-11 | 2010-05-19 | 天津泰达环保有限公司 | Sludge drying processing method and equipment |
| US20130161255A1 (en) * | 2011-12-21 | 2013-06-27 | General Electric Company | Microwave processing of wastewater sludge |
| CN103373801A (en) * | 2012-04-20 | 2013-10-30 | 青岛大学 | Continuous dehydrating method and device for explosive production wastewater and sludge |
-
2014
- 2014-05-05 CN CN201410185619.4A patent/CN105084702A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1158750A (en) * | 1995-12-21 | 1997-09-10 | 潘尼维斯公司 | Device for filtering, washing and drying solid material-liquid mixture |
| CN101708944A (en) * | 2009-12-11 | 2010-05-19 | 天津泰达环保有限公司 | Sludge drying processing method and equipment |
| US20130161255A1 (en) * | 2011-12-21 | 2013-06-27 | General Electric Company | Microwave processing of wastewater sludge |
| CN103373801A (en) * | 2012-04-20 | 2013-10-30 | 青岛大学 | Continuous dehydrating method and device for explosive production wastewater and sludge |
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Application publication date: 20151125 |
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