CN1031185C - Comprehensive treatment technology for waste sizing liquid - Google Patents
Comprehensive treatment technology for waste sizing liquid Download PDFInfo
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- CN1031185C CN1031185C CN92108307A CN92108307A CN1031185C CN 1031185 C CN1031185 C CN 1031185C CN 92108307 A CN92108307 A CN 92108307A CN 92108307 A CN92108307 A CN 92108307A CN 1031185 C CN1031185 C CN 1031185C
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- China
- Prior art keywords
- polyvinyl alcohol
- add
- pva
- ultrafiltration
- sizing
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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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
-
- 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
- Y02W30/62—Plastics recycling; Rubber recycling
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention relates to comprehensive treatment technology for sizing wastewater. PVA is recovered from sizing wastewater containing 2 to 3g/1 of polyvinyl alcohol (PVA) to be used as adhesive so that COD-[cr] of the wastewater is reduced from 3000 to 6000 mg/l to be below 150 mg/l to meet emission standards. The present invention comprises the following steps of ultrafiltration, salting out and biological contact oxidation; the technology of the present invention has the advantages of simple equipment, and simple and available method, is especially suitable for treating sizing wastewater in cotton mills, and desizing wastewater in printing and dyeing mills.
Description
The present invention is a kind of waste sizing comprehensive regulation novel method.Be applicable to and handle the waste sizing that cotton mill discharges, and therefrom reclaim polyvinyl alcohol (PVA).
Starching is a cotton spinning factory for preventing the fluffing of yarn suede, reduces broken end, is convenient to weave and the procedure that adopts.The raw material of sizing adopted natural matter starch in the past, in order to save food, and the domestic mixed slurry of using instead, based on macromolecule raw material PVA, adapted carboxymethyl cellulose (CMC), starch.Waste sizing is seriously polluted, COD
CrGenerally at 3000～6000mg/l (even up to 10000mg/l), it is up to standard that any single technology all is difficult to primary treatment.
Domestic Hunan Xiang Tan printing and dyeing mill introduces American AB COR ultrafiltration apparatus, and desized wastewater separates PVA through ultrafiltration and concentration and is back to production or has a fling at coating, tackiness agent, the COD of light liquid
CrFor about 400mg/l, can not reach emission standard.Beijing Printing and Dyeing Mill makes tackiness agent with the PVA in the salt analysis method concentrating and separating desized wastewater, and lye mixes with dyeing waste water again to be handled.Because China's slurry is mixed slurry, be mixed with starch in the concentrated solution, reuse grey cloth color and luster slightly dark and easily fermentation peculiar smell is arranged, actually be difficult to reuse, and also there are problems such as concentration in the recovery of PVA, so the Perfected process of non-processor waste sizing still so far.And external slurry is bigger with the possibility of ultrafiltration process recovery back utilization based on PVA.
The objective of the invention is to work out a kind of effective method of wastewater treatment.Existing quite high chemical oxygen demand cod
CrClearance is convenient to recycle PVA again.
Therefore, the invention provides a kind of waste sizing comprehensive regulation novel method that adopts ultrafiltration and salting-out process Separation and Recovery polyvinyl alcohol, may further comprise the steps:
A) above-mentioned waste sizing is the polysulfone membrane ultrafiltration of 1～50,000 the best 50,000 through the molecular retention amount, at 1～3kg/cm
2Best 1.5kg/cm
2Seepage water pressure under, be separated into the light liquid that dope that PVA concentration is 12～15g/l and PVA concentration are 0.1～0.12g/l;
B) dope that step a) is obtained is heated to 44～52 ℃, best 48 ℃, regulate pH value to 8.5～9.5, best 9, successively add jelling agent borax and salting-out agent sodium sulfate down in stirring, the add-on of borax is 0.8～1.6g/l, best 1.4g/l, the add-on of sodium sulfate is 10～18g/l, best 14g/l, react and saltoutd in 10～20 minutes, stir then, pulverize, dewater, the PVA gelinite and the PVA concentration that obtain the polymerization degree and be 1700, concentration are 30g/l are the lye of 1150～1200mg/l;
C) the light liquid that obtains by step a) and mix with volume ratio greater than 5: 1 by the lye that step b) obtains, enter the biological contact oxidation pond metabolism, water after the processing enters water body, the biological bed of biological contact oxidation pond adopts the compounded mix of being made up of not drawing-off POLYESTER YARNS and semi soft packing, and purification efficiency can improve 15%.
According to the present invention, handling PVA concentration is 2～3g/l, COD
CrBe the waste sizing of 3000～6000mg/l, can reclaim PVA economically, and, make the COD of waste water because the separation of PVA has improved wastewater biodegradability
CrReduce to below the 150mg/l its COD
CrClearance＞95～97.5% significantly are better than the set quota of national composite wastewater emission standard GB8978-88.
The rate of recovery of present method PVA＞90%, the PVA physicochemical property after the recovery are constant, and glue is made with fork-like farm tool used in ancient China in the polymerization degree＞1700, and quality is similar to goose board glue.
Accompanying drawing is used to describe main flow process proposed by the invention.
Volume is that the waste sizing 1 of Q flows in the circulation groove 2, be promoted to ultra-fine filter 4 with recycle pump 3, the molecular retention amount has been installed is 1～50,000 polysulfone membrane 5 in the ultra-fine filter, at seepage water pressure 1～3kg/cm
2, flux 15l/m
2Under the hr, make 92.5% PVA be held back into dope 6 by ultra-filtration membrane, the PVA concentration of dope is 12～15g/l, and the light liquid 7 that sees through contains molecular weight and all lower PVA and the most starch of the polymerization degree, and its PVA concentration is 0.1～0.12g/l, COD
CrBe 400～500mg/l, transit dose is the 5/6Q of flooding quantity.
Dope 6 under agitation adds the borax 8 of 0.8～1.6g/l, generates insoluble synthesis, and one side stirs then, one side continues to add the sodium sulfate 9 of 10～18g/l, and its temperature of reaction is 44～52 ℃, and pH value is 8.5～9.5, reaction times is 10～20 minutes, its PVA eduction rate＞92% of saltouing.
The PVA that separates out of saltouing reclaims liquid 10, and through the pulverizing colloidal fritter that is white in color, by dehydration, its volume can be 1/12～1/9Q, and its PVA content of separating out water is 1150～1200mg/l, COD
CrBe 2000～2400mg/l.
Light liquid 7 after the ultrafiltration with saltout after lye 11 mix with volume ratio greater than 5: 1, greatly reduce salt density (＜3g/l), guaranteed the eubolism of microorganism.This water can directly enter biological contact oxidation pond 12 and handle, and water outlet enters water body 13.
Be embodiments of the invention below.
Example 1:
Shanghai the 21 cotton mill's waste sizing 6 ton per days, COD
Cr3000～6000mg/l contains PVA 2～3g/l.At laboratory 0.2M
2Move processing condition on the ultra-filtration equipment: employing molecular retention amount is 50,000 polysulfone membrane, seepage water pressure 1.5kg/cm
2, flux 15～16 l/m
2Hr, obtain closing the dope of PVA12～15g/l after the ultrafiltration, be heated 48 ℃, after adjusting pH value to 9, add the 1.4g/l borax earlier and carry out complexing, after add 14g/l sodium sulfate and saltout, the PVA that separates out reclaims liquid and makees tackiness agent, light liquid after lye and the ultrafiltration mixes with 1.5: 15～16 liters volume ratios, enters biological contact oxidation pond, and water outlet result after tested is COD
Cr＜120mg/l, COD
CrClearance reaches 97.5%, and the PVA clearance reaches 97.5%.
Example 2:
Shanghai second cotton mill's waste sizing carries out on said apparatus with same processing condition, and the result is with example 1.
Example 3
Laboratory preparation waste sizing, its COD
CrBe 3000～6000mg/l, PVA is 2.5g/l, carries out on said apparatus with same processing condition, and the PVA color and luster of separating out is good, and the PVA rate of recovery reaches 98%, final outflow water COD
CrLess than 100mg/l.
Claims (4)
1. waste sizing comprehensive regulation novel method that adopts ultrafiltration and salting-out process Separation and Recovery polyvinyl alcohol the invention is characterized in that it may further comprise the steps:
A) this waste sizing is 1～50,000 polysulfone membrane ultrafiltration through the molecular retention amount, at 1～3kg/cm
2Infiltration, pressure under, be separated into the light liquid that dope that polyvinyl alcohol concentration is 12～15g/l and polyvinyl alcohol concentration are 0.1～0.12g/l;
B) with step a). the dope that obtains is heated to 44～52 ℃, regulate pH value to 8.5～9.5, successively add jelling agent borax and salting-out agent sodium sulfate down in stirring, the add-on of borax is 0.8～1.6g/l, the add-on of sodium sulfate is 10～18g/l, react and saltoutd in 10～20 minutes, stir then, pulverize, dewater, the polyvinyl alcohol gel rubber and the polyvinyl alcohol concentration that obtain the polymerization degree and be 1700, concentration are 30g/l are the lye of 1150～1200mg/l;
C) the light liquid that is obtained by step a) and mixed with the volume ratio greater than 5: 1 by the lye that step b) obtains enters the biological contact oxidation pond metabolism, and the water after the processing enters water body.
2. method according to claim 1, wherein in step a), the processing condition of ultrafiltration are that the molecular retention amount of polysulfone membrane is 50,000, seepage water pressure is 1.5kg/cm
2
3. method according to claim 1, wherein in step b), the processing condition of saltouing are 48 ℃ of temperature of reaction, and the solution pH value is 9, and jelling agent borax add-on is 1.4g/l, and salting-out agent sodium sulfate add-on is 14g/l.
4. method according to claim 1, wherein in step c), the biological bed of biological contact oxidation pond adopts the compounded mix of being made up of not drawing-off POLYESTER YARNS and semi soft packing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92108307A CN1031185C (en) | 1992-01-18 | 1992-01-18 | Comprehensive treatment technology for waste sizing liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92108307A CN1031185C (en) | 1992-01-18 | 1992-01-18 | Comprehensive treatment technology for waste sizing liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1062517A CN1062517A (en) | 1992-07-08 |
| CN1031185C true CN1031185C (en) | 1996-03-06 |
Family
ID=4943420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92108307A Expired - Fee Related CN1031185C (en) | 1992-01-18 | 1992-01-18 | Comprehensive treatment technology for waste sizing liquid |
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| Country | Link |
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| CN (1) | CN1031185C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10201690A1 (en) * | 2002-01-17 | 2003-07-31 | Basf Ag | Process for the recovery of sizes by a combination of desizing with dispersants / complexing agents and subsequent recycling |
| EP1735256A2 (en) * | 2004-03-18 | 2006-12-27 | Shell Internationale Research Maatschappij B.V. | Process for treating a loaded solvent stream having a time-varying concentration of contaminant |
| CN102363543B (en) * | 2011-09-15 | 2013-04-17 | 桐乡市健民过滤材料有限公司 | Method for processing wastewater with high content polyvinyl alcohol |
| CN102659267B (en) * | 2012-05-25 | 2013-09-18 | 广东溢达纺织有限公司 | Removing method of PVA (polyvinyl acetate) in desizing wastewater and device |
| CN102992525B (en) * | 2012-12-05 | 2014-05-28 | 波鹰(厦门)科技有限公司 | Device and method thereof for recycling PVA (Polyvinyl Acetate) from desizing wastewater |
| CN103073163B (en) * | 2013-02-01 | 2014-07-30 | 波鹰(厦门)科技有限公司 | Treatment and sludge reduction device and method of de-sizing wastewater |
| CN105948196A (en) * | 2016-05-05 | 2016-09-21 | 杭州博天环保科技有限公司 | Water-soluble cloth dissolution wastewater combination equipment and pretreatment process |
| CN108975457A (en) * | 2017-06-02 | 2018-12-11 | 周武宏 | A kind of method of ultrafiltration centrifugation joint filter membrane recycling Polyvinyl Alcohol in Desizing Wastewater |
| CN108084968B (en) * | 2017-12-14 | 2020-05-29 | 东华大学 | Method for preparing dust suppressant by recycling polyvinyl alcohol-containing desizing wastewater |
| CN111099759A (en) * | 2018-10-25 | 2020-05-05 | 中国石油化工股份有限公司 | Polyvinyl alcohol wastewater treating agent and method for treating wastewater by using same |
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1992
- 1992-01-18 CN CN92108307A patent/CN1031185C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1062517A (en) | 1992-07-08 |
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