CN105417762A - Novel process for recycling alkali through ceramic membrane and electrodialysis coupling - Google Patents
Novel process for recycling alkali through ceramic membrane and electrodialysis coupling Download PDFInfo
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- CN105417762A CN105417762A CN201511026861.8A CN201511026861A CN105417762A CN 105417762 A CN105417762 A CN 105417762A CN 201511026861 A CN201511026861 A CN 201511026861A CN 105417762 A CN105417762 A CN 105417762A
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- ceramic membrane
- concentration
- electrodialysis
- caustic soda
- alkali
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a novel process for recycling alkali through ceramic membrane and electrodialysis coupling. The novel process includes the following steps that after waste alkali liquor enters a buffer tank to be homogenized, the waste alkali liquor enters a circulating tank through a pouring pump, and is pumped into ceramic membrane pretreatment equipment through a supply pump to be filtered, thick water returns to the buffer tank after sheet frame impurity removal, and the electrodialysis step is directly executed on clear liquor; in the electrodialysis step, alkali and semi-fibers in the waste alkali liquor are separated through the homogeneous phase electrodialysis process, high-concentration caustic soda obtained on the concentration side is used for the steeping process, and a high-concentration semi-fiber solution obtained on the desalting side is further subjected to deep treatment. The coupling process of ceramic membrane pretreatment and homogeneous membrane electrodialysis is adopted, a ceramic membrane operates stably in a high-concentration alkali solution, and is easy to clean and restore, good in continuity, high in filtering accuracy and stable in operation, the separation efficiency and accuracy of the caustic soda and the semi-fibers are higher, the concentration of the obtained caustic soda and the obtained semi-fibers is higher, and a reliable guarantee is provided for reusing the caustic soda in the steeping process.
Description
Technical field
The present invention relates to alkali collection novel process in a kind of cellulose viscose manufacturing technique, especially design a kind of ceramic membrane and to be coupled with electrodialysis alkali collection novel process, belong to water-treatment technology field, especially belong to industrial waste water treatment.
Background technology
When in the immersion liquid that viscose fiber is produced, hemicellulose level exceedes certain limit, the squeezing of soda cellulose and the filterableness of viscose glue can be made to worsen, and the consumption of chemical industry material increases, the Quality Down of fiber.Therefore, hemicellulose must be exceeded the hydraulic fluid otherwise processed of certain content in production, caustic soda consumption amount will be caused undoubtedly to increase as wastewater treatment hydraulic fluid, seriously polluted, production cost is too high, once does the research about being separated hemicellulose in hydraulic fluid both at home and abroad, as utilized ultrafiltration process, add low-boiling compound, add the methods such as flocculating aids, coagulant aids, electrodialysis, but all do not adopt aborning due to the problem such as separating effect and cost.At present, method leading is at home film process, and it produces flowing according to film both sides solute concentration difference and reaches separating effect.The advantage of film process is: production cost is low, and operator are few, good separating effect.
Also Chinese patent is had to disclose membrane technique for alkali collection in cellulose viscose manufacturing technique in recent years.Wherein, Chinese patent (CN103349912A) discloses a kind of electroosmose process alkali recovery process, but the improvement focusing on pretreatment technology of this invention, and this pretreatment technology needs through multiple working procedures such as electricity flocculation-millipore filtration-diffusion dialysis, device structure is comparatively complicated and the pretreated efficiency of multiple operation is low and energy consumption is higher, is not suitable for large-scale promotion application.Chinese patent (CN102941017A) discloses a kind of method adopting alkali lye in diffusion dialysis process cellulose viscose manufacturing technique, this system realizes recycle of alkali liquor by diffusion dialysis, but this technique also only takes conventional pre-treatment, pollutent in alkali lye can cause heavier fouling membrane to diffusion dialysis membrane stack and reduce the life-span, thus causes subsequent recovery process costs higher.
Although there has been the more related process about Alkaline pretreatment in cellulose viscose manufacturing technique to report, but the report be showed no about adopting ceramic membrane alkali lye to be carried out to pretreatment technology, and the application of ceramic membrane in process cellulose viscose manufacturing technique in recycle of alkali liquor technique has significant advantage: first, the resistance to caustic soda corrosion of ceramic membrane, thus work-ing life is longer; Secondly, the more general pretreatment technology of ceramic membrane has higher filtering accuracy, and prefinished products is more conducive to the steady running of electrodialysis process.
In addition, at present about the recovery process after cellulose viscose manufacturing technique Alkaline pretreatment, reporting for work of existing employing electrodialysis process, and existing electrodialysis process all adopts out-phase electrodialytic membranes and there is separation efficiency and the low problem of separation accuracy, and adopt homogeneous membrane electrodialysis for realizing caustic soda and half fine being separated, comparatively heterogeneous membrane technique is higher for concentration side concentration of caustic soda, comparatively heterogeneous membrane is also higher for the fine concentration in desalination side half, the efficiency of electrodialysis process can improve greatly, but has no about the application of homogeneous phase electrodialytic technique in alkali recovery process.
Summary of the invention
High for alkali concn in alkali lye in cellulose viscose manufacturing technique, certain density half fibre etc. simultaneously had in waste water has high reuse and is worth, and for base extraction technique Problems existing in existing cellulose viscose manufacturing technique, the present invention proposes a kind of base extraction and reuse technology efficiently, namely adopt and there is ceramic membrane technology carry out pre-treatment, improve pretreated effect, ensure efficient, the steady running of follow-up electrodialysis process, achieved the recycling of alkali lye by the combination of ceramic membrane pre-treatment and homogeneous phase electrodialysis process.The viscose fiber production alkali lye water technology being core technology with ceramic membrane pre-treatment that the present invention proposes, mainly realizes following object: one is the reuse realizing waste lye, and reduces the discharge of COD and alkaline solution; Two is the discharge of wastewater reducing production process, meets environmental requirement.
Realizing above-mentioned purpose technical scheme is:
A kind of ceramic membrane is coupled with electrodialysis alkali collection novel process, comprises the following steps:
(1) first waste lye enters surge tank and carries out homogeneous; Waste lye after homogeneous enters circulation groove through batch turning pump, after squeeze into ceramic membrane pre-processing device through charging pump and filter, ceramic membrane filter transmembrane pressure controls between 0.1 ~ 0.6MPa, cross-flow velocity controls between 1m/s ~ 7m/s, cycles of concentration is between 10 ~ 60 times, dense water is back to surge tank after sheet frame removal of impurities, and clear liquid directly enters electrodialysis step;
(2) diaphragm that electrodialysis step adopts is homogeneous phase electrodialytic membranes, alkali and half fine separation in waste lye is realized by homogeneous phase electrodialysis process, the concentration of caustic soda that concentration side obtains is higher than 200g/L and half fine concentration is used for steeping process lower than the production of high concentration caustic soda of 5g/L, the concentration of caustic soda that desalination side obtains lower than 10g/L and half fine concentration higher than the further advanced treatment of high density half fibrinolytic liquid of 150g/L;
(3) after running for some time, the cleaning model that ceramic film component adopts soda acid to replace cleans, and scavenging period is at 0.5 ~ 2h, and acid base concentration all controls 0.5 ~ 2%, cleaning temperature 50 ~ 90 DEG C, and single batch materials cleaning once.
Wherein, in step 1, the ceramic membrane materials that described ceramic membrane pre-processing device adopts comprises aluminum oxide, zirconium white and silicon carbide etc., and ceramic membrane aperture is between 2 ~ 500nm.
Preferably, in step 1, described ceramic membrane aperture is ultrafiltration ceramic membrane or the microfiltration ceramic membrane of 50 ~ 200nm.
Preferably, in step 1, the transmembrane pressure of described ceramic membrane is preferably 0.2 ~ 0.4MPa.
Preferably, in step 1, the membrane cross-flow velocity of described ceramic membrane is preferably 3 ~ 5m/s.
Preferably, indication ceramic membrane preprocessing process of the present invention is concentration process, and according to the concentration difference carrying out impurities in water, cycles of concentration is between 30 ~ 60.
Wherein, the homogeneous in step 1 refers to the waste water produced from waste lye in production process and dense water treatment system and carries out homogeneous, can avoid, because the stability of variation water quality to membranous system impacts, being beneficial to membrane concentration process by homogeneous.
Because ceramic membrane has good resistance to alkali ability and resistance to corrosion, therefore: on the one hand, ceramic membrane can steady running in high concentration alkali solution; On the other hand, the clean-out system that contaminated ceramic membrane is suitable for is more, can clean recovery preferably, ensures the continuity of membrane filtration processes.Ceramic membrane membrane filtration processes is Ceramic excessive filtration or ceramic micro filter process, pore diameter range between 2 ~ 500nm, preferably 50 ~ 200nm; Described operation transmembrane pressure controls at 0.1 ~ 0.6MPa, preferably 0.2 ~ 0.4MPa; Described cross-flow velocity controls at 1 ~ 7m/s, preferably the crossflow velocity of 3 ~ 5m/s.
Therefore, the ceramic membrane equipment that the present invention adopts can realize good pre-treatment, and effluent quality meets electrodialytic inflow requirement.
Further, described electrodialysis process realizes caustic soda and half fine being separated in waste lye, and the caustic soda of recovery again for steeping process, can reduce caustic soda and COD discharge.
The present invention higher than 90% to the rate of recovery of caustic soda, reclaims concentration of caustic soda higher than 200g/L, meets steeping process service requirements.
The present invention has played the advantages such as high, the resistance to highly basic of ceramic membrane separation precision, contamination resistance be strong, it is the optimal pretreatment technology of recycle of alkali liquor process, and without the need to adding other chemical reagent in ceramic membrane and electrodialysis coupling technique, can realize recycle of alkali liquor in cellulose viscose manufacturing technique and recycle, be a kind of recycle of alkali liquor technique of environmental protection.
Compared to the alkali recovery process in the cellulose viscose manufacturing technique of prior art, the ceramic membrane novel process that is coupled with electrodialysis that the present invention adopts has following advantage:
(1) compared with other technique, ceramic membrane technique is adopted to carry out pre-treatment, ceramic membrane can steady running in high concentration alkali solution, the clean-out system that contaminated ceramic membrane is suitable for is more, recovery can be cleaned preferably, ensure the continuity of membrane filtration processes, thus ensure that filtering accuracy, give security for whole process stabilizing runs;
(2) adopt homogeneous membrane electrodialysis process, system caustic soda is higher with half fine separation efficiency, obtain caustic soda and half fine concentration higher;
(3) adopt homogeneous membrane electrodialysis process, system caustic soda is higher with the separation accuracy of half fibre, and higher separation accuracy provides reliable guarantee for caustic soda is back to steeping process.
Embodiment
Be clearly and completely described to the technical scheme in the embodiment of the present invention below.
Embodiment one
For the waste lye in certain chemical fibre factory's production process of viscose fiber, adopt membrane integrating technique to realize recycle of alkali liquor in cellulose viscose manufacturing technique, day output is 20m
3;
Stoste concentration of caustic soda is 4.88mol/L, and half fine concentration is 62g/L, and the day operation time is 20h, and adopt ceramic membrane equipment to carry out pre-treatment, ceramic membrane design and operation flux is 100Lm
-2h
-1, the mould material of selected ceramic membrane is ZrO
2/ Al
2o
3(i.e. Al
2o
3film tube-surface has ZrO
2rete, subsequent embodiment mould material is film pipe+film layer structure), mean pore size is 50nm, and transmembrane pressure is 2.5bar, crossflow velocity 4m/s; Adopt homogeneous membrane electrodialyzer, required membrane area is 270m
2, pole liquid (Na
2sO
4) concentration 60g/L, running current is 172A, and output voltage is 100V;
Enter circulation groove after entering surge tank and dense water homogenisation from the waste lye of technological process, after ceramic membrane continuous concentration to 40 times, the dense water yield is 0.5m
3/ d, dense water enters ceramic membrane system buffer tank after entering filter press removal of impurities; Clear liquid enters homogeneous membrane electrodialysis system, and after electrodialysis system process, concentration side concentration of caustic soda 220g/L, the fine concentration in desalination side half reaches 120g/L, and system achieves the recycling of caustic soda.
Embodiment two
Adopt recycle of alkali liquor in membrane integrating technique process chemical fibre factory cellulose viscose manufacturing technique, day output is 50m
3;
Stoste concentration of caustic soda 3.6mol/L, half fine concentration is 50g/L, and the day operation time is 20h, adopts ceramic membrane equipment to carry out pre-treatment; Ceramic membrane design and operation flux is 120Lm
-2h
-1, the mould material of selected ceramic membrane is ZrO
2/ Al
2o
3, mean pore size is 20nm, and transmembrane pressure is 3.5bar, crossflow velocity 4m/s; Adopt homogeneous membrane electrodialyzer, required membrane area is 675m
2; Pole liquid (Na
2sO
4) concentration 30g/L, running current is 175A, and output voltage is 100V;
Enter circulation groove after entering surge tank and dense water homogenisation from the waste lye of technological process, after ceramic membrane continuous concentration to 50 times, the dense water yield is 1m
3/ d, dense water enters ceramic membrane system buffer tank after entering filter press removal of impurities; Clear liquid enters homogeneous membrane electrodialysis system, and after electrodialysis system process, concentration side concentration of caustic soda 200g/L, the fine concentration in desalination side half reaches 150g/L, and system achieves the recycling of caustic soda.
Embodiment three
Adopt recycle of alkali liquor in membrane integrating technique process chemical fibre factory cellulose viscose manufacturing technique, day output is 200m
3;
Stoste concentration of caustic soda 3.8mol/L, half fine concentration is 45g/L, and the day operation time is 20h, and adopt ceramic membrane equipment to carry out pre-treatment, ceramic membrane design and operation flux is 110Lm
-2h
-1; The mould material of selected ceramic membrane is ZrO
2/ Al
2o
3, mean pore size is 100nm, and transmembrane pressure is 2.0bar, crossflow velocity 3.5m/s; Adopt homogeneous membrane electrodialyzer, required membrane area is 2500m
2; Pole liquid (Na
2sO
4) concentration 30g/L, running current is 410A, and output voltage is 500V;
Enter circulation groove after entering surge tank and dense water homogenisation from the waste lye of technological process, after ceramic membrane continuous concentration to 50 times, the dense water yield is 4m
3/ d, dense water enters ceramic membrane system buffer tank after entering filter press removal of impurities; Clear liquid enters homogeneous membrane electrodialysis system, after electrodialysis system process, and concentration side concentration of caustic soda 210g/L, the fine concentration in desalination side half reaches 160g/L; System achieves the recycling of caustic soda.
Embodiment four
Adopt recycle of alkali liquor in membrane integrating technique process chemical fibre factory cellulose viscose manufacturing technique, day output is 100m
3;
Stoste concentration of caustic soda 4.3mol/L, half fine concentration is 57g/L, and the day operation time is 20h, and adopt ceramic membrane equipment to carry out pre-treatment, ceramic membrane design and operation flux is 100Lm
-2h
-1; The mould material of selected ceramic membrane is SiC/Al
2o
3, mean pore size is 200nm, and transmembrane pressure is 2.0bar, crossflow velocity 3.0m/s; Adopt homogeneous membrane electrodialyzer, required membrane area is 2500m
2; Pole liquid (Na
2sO
4) concentration 30g/L, running current is 410A, and output voltage is 500V;
Enter circulation groove after entering surge tank and dense water homogenisation from the waste lye of technological process, after ceramic membrane continuous concentration to 50 times, the dense water yield is 2m
3/ d, dense water enters ceramic membrane system buffer tank after entering filter press removal of impurities; Clear liquid enters homogeneous membrane electrodialysis system, after electrodialysis system process, and concentration side concentration of caustic soda 200g/L, the fine concentration in desalination side half reaches 150g/L; System achieves the recycling of caustic soda.
Embodiment five
Adopt recycle of alkali liquor in membrane integrating technique process chemical fibre factory cellulose viscose manufacturing technique, day output is 200m
3;
Stoste concentration of caustic soda 4.2mol/L, half fine concentration is 53g/L, and the day operation time is 20h, and adopt ceramic membrane equipment to carry out pre-treatment, ceramic membrane design and operation flux is 110Lm
-2h
-1; The mould material of selected ceramic membrane is SiC/Al
2o
3, mean pore size is 200nm, and transmembrane pressure is 1.0bar, crossflow velocity 2.5m/s; Adopt homogeneous membrane electrodialyzer, required membrane area is 675m
2; Pole liquid (Na
2sO
4) concentration 30g/L, running current is 175A, and output voltage is 100V;
Enter circulation groove after entering surge tank and dense water homogenisation from the waste lye of technological process, after ceramic membrane continuous concentration to 50 times, the dense water yield is 4m
3/ d, dense water enters ceramic membrane system buffer tank after entering filter press removal of impurities; Clear liquid enters homogeneous membrane electrodialysis system, after electrodialysis system process, and concentration side concentration of caustic soda 200g/L, the fine concentration in desalination side half reaches 160g/L; System achieves the recycling of caustic soda.
Embodiment six
Adopt recycle of alkali liquor in membrane integrating technique process chemical fibre factory cellulose viscose manufacturing technique, day output is 500m
3;
Stoste concentration of caustic soda 3.6mol/L, half fine concentration is 43g/L, and the day operation time is 20h, adopts ceramic membrane equipment to carry out pre-treatment; Ceramic membrane design and operation flux is 120Lm
-2h
-1, the mould material of selected ceramic membrane is ZrO
2/ Al
2o
3, mean pore size is 20nm, and transmembrane pressure is 4.5bar, crossflow velocity 5m/s; Adopt homogeneous membrane electrodialyzer, required membrane area is 2500m
2; Pole liquid (Na
2sO
4) concentration 20g/L, running current is 510A, and output voltage is 500V;
Enter circulation groove after entering surge tank and dense water homogenisation from the waste lye of technological process, after ceramic membrane continuous concentration to 50 times, the dense water yield is 10m
3/ d, dense water enters ceramic membrane system buffer tank after entering filter press removal of impurities; Clear liquid enters homogeneous membrane electrodialysis system, after electrodialysis system process, and concentration side concentration of caustic soda 220g/L, the fine concentration in desalination side half reaches 120g/L; System achieves the recycling of caustic soda.
Embodiment seven
Based on any embodiment in embodiment one to six, after long-time running, the membrane flux of ceramic film component can because the factors such as fouling decline to some extent, now compound concentration be 1% chelated dispersants carry out wash cycles, scavenging period 2h, cleaning temperature 70 DEG C, membrane flux can recover more than 95%.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. ceramic membrane is coupled with electrodialysis an alkali collection novel process, it is characterized in that, comprises the following steps:
(1) first waste lye enters surge tank and carries out homogeneous; Waste lye after homogeneous enters circulation groove through batch turning pump, after squeeze into ceramic membrane pre-processing device through charging pump and filter, ceramic membrane filter transmembrane pressure controls between 0.1 ~ 0.6MPa, cross-flow velocity controls between 1 ~ 7m/s, cycles of concentration is between 10 ~ 60 times, dense water is back to surge tank after sheet frame removal of impurities, and clear liquid directly enters electrodialysis step;
(2) diaphragm that electrodialysis step adopts is homogeneous phase electrodialytic membranes, alkali and half fine separation in waste lye is realized by homogeneous phase electrodialysis, the concentration of caustic soda that concentration side obtains is higher than 200g/L and half fine concentration is used for steeping process lower than the production of high concentration caustic soda of 5g/L, the concentration of caustic soda that desalination side obtains lower than 10g/L and half fine concentration higher than the further advanced treatment of high density half fibrinolytic liquid of 150g/L;
(3) after running for some time, the cleaning model that ceramic film component adopts soda acid to replace cleans, and scavenging period is at 0.5 ~ 2h, and acid base concentration all controls 0.5 ~ 2%, cleaning temperature 50 ~ 90 DEG C, and single batch materials cleaning once.
2. a kind of ceramic membrane according to claim 1 is coupled with electrodialysis alkali collection novel process, it is characterized in that, in step 1, the ceramic membrane materials that described ceramic membrane pre-processing device adopts be aluminum oxide, zirconium white with or silicon carbide in any one, ceramic membrane aperture is between 2 ~ 500nm.
3. a kind of ceramic membrane according to claim 2 is coupled with electrodialysis alkali collection novel process, and it is characterized in that, in step 1, described ceramic membrane aperture is ultrafiltration ceramic membrane or the microfiltration ceramic membrane of 50 ~ 200nm.
4. a kind of ceramic membrane according to claim 1 is coupled with electrodialysis alkali collection novel process, and it is characterized in that, in step 1, the transmembrane pressure of described ceramic membrane is 0.1 ~ 0.3MPa.
5. a kind of ceramic membrane according to claim 1 is coupled with electrodialysis alkali collection novel process, and it is characterized in that, in step 1, the membrane cross-flow velocity of described ceramic membrane is 4 ~ 6m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511026861.8A CN105417762A (en) | 2015-12-31 | 2015-12-31 | Novel process for recycling alkali through ceramic membrane and electrodialysis coupling |
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|---|---|---|---|
| CN201511026861.8A CN105417762A (en) | 2015-12-31 | 2015-12-31 | Novel process for recycling alkali through ceramic membrane and electrodialysis coupling |
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| CN105417762A true CN105417762A (en) | 2016-03-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110526839A (en) * | 2019-07-31 | 2019-12-03 | 杭州蓝然环境技术股份有限公司 | A kind of improved epoxyethane method prepares taurine technique |
| CN113800693A (en) * | 2021-10-20 | 2021-12-17 | 山东福田药业有限公司 | Deep dealkalization method for viscose fiber wastewater |
| CN113896360A (en) * | 2021-09-26 | 2022-01-07 | 四川雅华生物有限公司 | Method and system for separating and recovering alkali and hemicellulose from wastewater stock solution |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110526839A (en) * | 2019-07-31 | 2019-12-03 | 杭州蓝然环境技术股份有限公司 | A kind of improved epoxyethane method prepares taurine technique |
| CN110526839B (en) * | 2019-07-31 | 2021-12-28 | 杭州蓝然环境技术股份有限公司 | Improved process for preparing taurine by ethylene oxide method |
| CN113896360A (en) * | 2021-09-26 | 2022-01-07 | 四川雅华生物有限公司 | Method and system for separating and recovering alkali and hemicellulose from wastewater stock solution |
| CN113800693A (en) * | 2021-10-20 | 2021-12-17 | 山东福田药业有限公司 | Deep dealkalization method for viscose fiber wastewater |
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