CN113896360A - Method and system for separating and recovering alkali and hemicellulose from wastewater stock solution - Google Patents
Method and system for separating and recovering alkali and hemicellulose from wastewater stock solution Download PDFInfo
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- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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Abstract
The invention relates to the technical field of textile industry wastewater recovery, in particular to a method and a system for separating and recovering alkali and hemicellulose from a wastewater stock solution, wherein the integral alkali recovery rate can reach more than 90 percent and the integral hemicellulose recovery rate can reach more than 95 percent through the combined application of a first-stage electrodialysis membrane system, a nanofiltration membrane dealkalization system and a disc-type high-speed centrifuge or a ceramic membrane, and the problem of poor separation and recovery effect of the hemicellulose and alkali liquor can be effectively solved.
Description
Technical Field
The invention relates to the technical field of textile industry wastewater recovery, in particular to a method and a system for separating and recovering alkali and hemicellulose from a wastewater stock solution.
Background
The waste water is the most important environmental problem in the industries of textile, paper making and the like. The data show that: the wastewater discharge amount of the textile industry is ten times higher than that of each industry, the COD discharge amount accounts for about 5 percent of the national industrial discharge amount, and a considerable part of wastewater is discharged into the sea directly. At present, a lot of dispersed industries such as textile, papermaking, pulping and the like only utilize cellulose in plants, and discharged wastewater also contains a large amount of hemicellulose. Meanwhile, the textile industry generally uses sodium hydroxide with the concentration of about 18 percent, and the concentration of the sodium hydroxide in the discharged wastewater is about 4 percent. At present, the recovery rate of sodium hydroxide with the concentration of less than 4 percent in the textile industry is zero, and a large amount of sodium hydroxide enters waste water treatment.
On the other hand, in the industries of textile, paper making and the like, the treatment of hemicellulose in waste water is a troublesome problem, a large amount of economic cost is consumed every year, and an ideal effect cannot be achieved. Although domestic processes for producing xylose by hemicellulose are quite mature, the cost for recovering and extracting the hemicellulose from the wastewater is still high. At present, the alkali recovery process in the textile industry mainly takes a nanofiltration membrane system as a main part. The nanofiltration membrane system has relatively low interception rate to hemicellulose and the like, high operation cost and low recovery rate. The overall economic benefit is low, the resource waste is large, the back-end processing is difficult, and the like.
The most advanced hemicellulose recovery method at present is the hemicellulose neutralized by Xinjiang ceramic membrane dialysis, and then spray drying. However, the technical scheme can be implemented only based on low steam cost in Xinjiang, and cannot be economically popularized to other areas. The alkali in the existing hemicellulose is mainly recovered by a nanofiltration membrane system and an electrodialysis membrane system.
The technical difficulty lies in that:
at present, 4 percent of alkali in the waste water in the textile industry can not be recovered continuously, and because the semi-fiber is dissolved in the alkali liquor, when the alkalinity is continuously reduced, the semi-fiber is separated out from the dissolved state, so that the conventional schemes such as membrane filtration and the like can not be continued.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a system for separating and recovering alkali and hemicellulose from a wastewater stock solution, which can effectively solve the problem of poor separation and recovery effects of the hemicellulose and alkali liquor.
The invention is realized by adopting the following technical scheme:
a method for separating and recovering alkali and hemicellulose from a wastewater stock solution is characterized by comprising the following steps: the method comprises the following steps:
a. conveying the wastewater stock solution containing alkali and hemicellulose to a first-stage electrodialysis membrane system for first-step dealkalization;
b. dividing the dealkalized stock solution into two parts, wherein one part is high-alkali low-hemicellulose solution, and the other part is low-alkali high-hemicellulose solution; adding water into the low-alkali high-hemicellulose liquid, mixing, and inputting into a nanofiltration membrane dealkalization system;
c. the nanofiltration membrane dealkalization system separates the low-alkali high hemicellulose liquid into two parts, wherein one part is concentrated high hemicellulose liquid i, and the other part is filtered low hemicellulose liquid i;
d. dividing the low hemicellulose liquid i filtered out in the step c into two parts, and mixing one part with the high-alkali low hemicellulose liquid in the first-stage electrodialysis system in the step a to obtain a first-stage mixed liquid;
e. c, mixing the high hemicellulose liquid i concentrated in the step c with the other part of low hemicellulose liquid i obtained in the step d, entering a second-stage electrodialysis membrane system, performing secondary electrodialysis, and separating again to obtain a high hemicellulose liquid ii and a low hemicellulose liquid ii;
f. mixing the primary mixed solution obtained in the step d with the low hemicellulose liquid ii obtained in the step e to form a secondary mixed solution, so as to realize alkali liquor recovery; e, filtering the high hemicellulose liquid ii in the step e again to obtain a slag liquid and a clear liquid, and recovering the slag liquid to realize the recovery of the hemicellulose; and c, mixing the clear liquid with the low-alkali high-hemicellulose liquid obtained in the step b and the added water, and inputting the mixture into a nanofiltration membrane dealkalization system.
In the step b, the water amount added into the low-alkali high-hemicellulose liquid is 30-40% of the volume of the low-alkali high-hemicellulose liquid.
The step f of filtering the high hemicellulose liquid ii obtained in the step e again specifically comprises the following steps: and (4) inputting the high hemicellulose liquid ii into a high-speed disc type separator for separation and filtration.
The rotating speed of the high-speed disc type separator is not lower than 10000 r/min.
The step f of filtering the high hemicellulose liquid ii obtained in the step e again specifically comprises the following steps: and (3) inputting the high hemicellulose liquid ii into a ceramic membrane for filtration.
The alkali content in the wastewater stock solution containing alkali and hemicellulose is 40-44g/L, and the hemicellulose content is 100-110 g/L; the content of alkali in the high-alkali low-hemicellulose liquid is 42-46g/L, and the content of hemicellulose is 4-6 g/L; the content of alkali in the low-alkali high-hemicellulose liquid is 18-20g/L, and the content of hemicellulose is 80-90 g/L; the alkali content in the concentrated high hemicellulose liquid i is 10-14g/L, and the hemicellulose content is 95-105 g/L; the content of alkali in the filtered low hemicellulose liquid i is 10-14g/L, and the content of hemicellulose is 4-6 g/L; the content of alkali in the high hemicellulose liquid ii is 4-6g/L, and the content of hemicellulose is 95-105 g/L; the content of alkali in the low hemicellulose liquid ii is 20-25g/L, and the content of hemicellulose is 4-6 g/L; the content of alkali in the slag liquid is 4-6g/L, and the content of hemicellulose is 240-270 g/L; the content of alkali in the clear liquid is 4-6g/L, and the content of hemicellulose is 30-40 g/L.
And f, recycling the alkali liquor in the step f for recycling the textile fiber, and recycling the residue liquor into the downstream xylose production industry.
A system for separating and recovering alkali and hemicellulose from a wastewater stock solution is characterized in that: the device comprises a wastewater stock solution, a first-stage electrodialysis membrane system, a nanofiltration membrane dealkalization system, a second-stage electrodialysis membrane system, a first collecting box and a second collecting box; the wastewater stock solution is introduced into a first-stage electrodialysis membrane system, a high-alkali low-hemicellulose liquid outlet of the first-stage electrodialysis membrane system is communicated with a first collecting box through a first pipeline, a low-alkali high-hemicellulose liquid outlet of the first-stage electrodialysis membrane system is communicated with a nanofiltration membrane dealkalization system through a second pipeline, and a high-hemicellulose liquid outlet of the nanofiltration membrane dealkalization system is communicated with a second-stage electrodialysis membrane system through a third pipeline; the low hemicellulose liquid outlet of the nanofiltration membrane dealkalization system is communicated with the first pipeline through a fourth pipeline; a branch is further arranged on the fourth pipeline, and the other end of the branch is communicated with the third pipeline; the high semi-fiber liquid outlet of the second-stage electrodialysis membrane system is communicated with a second collecting box through a fifth pipeline; and a low semi-fiber liquid outlet of the second-stage electrodialysis membrane system is communicated with the first pipeline through a sixth pipeline.
One end of the fifth pipeline is communicated with a high-semi-fiber liquid outlet of the second-stage electrodialysis membrane system, and the other end of the fifth pipeline is connected with the high-speed disc type separator or the ceramic membrane; a clear liquid outlet and a residue liquid outlet are arranged on the high-speed disc type separator or the ceramic membrane; the clear liquid outlet is communicated with the second pipeline through a seventh pipeline, and the residue liquid outlet is communicated with the second collecting box through an eighth pipeline.
The water injection device is characterized by further comprising a water tank and a water injection pipe, wherein one end of the water injection pipe is connected with the water tank, and the other end of the water injection pipe is communicated with the second pipeline.
Compared with the prior art, the invention has the beneficial effects that:
1. the combined application of the first-stage electrodialysis membrane system, the second-stage electrodialysis membrane system, the nanofiltration membrane dealkalization system and the high-speed disc centrifuge or ceramic membrane can ensure that the overall alkali recovery rate reaches more than 90 percent. The alkali with the concentration of about 40g/L is discharged to the downstream alkali liquor with the concentration of about 5g/L, and the rest is recycled; the recovery rate of the whole semi-fiber can reach more than 95 percent. The hemicellulose with the concentration of about 110g/L returns to the upstream hemicellulose with the alkali liquor, and the rest is recycled.
2. The combined application of the first-stage electrodialysis membrane system, the second-stage electrodialysis membrane system, the nanofiltration membrane dealkalization system and the high-speed disc centrifuge or ceramic membrane solves the problem that nanofiltration cannot improve the electrolyte concentration, simultaneously solves the problem that the electrodialysis membrane is blocked in the process of separating out semi-fibers, and bypasses the problem that the electrodialysis membrane and the nanofiltration membrane are blocked by separating out the semi-fibers in the dealkalization state through nanofiltration and centrifugation, so that the combined application can be effectively applied to the production process, and great economic benefits are brought to upstream alkali recovery and downstream hydrolysis semi-fibers.
Drawings
The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:
FIG. 1 is a first schematic flow chart of the present invention;
FIG. 2 is a second flow chart of the present invention;
FIG. 3 is a first schematic diagram of the system according to the present invention;
FIG. 4 is a schematic diagram of the system structure of the present invention;
the labels in the figure are:
1. the device comprises a first-stage electrodialysis membrane system, a nanofiltration membrane dealkalization system, a second-stage electrodialysis membrane system, a first collecting box, a second collecting box, a first pipeline, a second pipeline, a branch, a third pipeline, a fourth pipeline, a fifth pipeline, a pipeline 12, a sixth pipeline, a high-speed disc type separator 13, a ceramic membrane 14, a seventh pipeline, a pipeline 16, an eighth pipeline, a water tank 19, a water injection pipe 20, a water injection pipe 21 and a wastewater stock solution 4.
Detailed Description
Example 1
Referring to the accompanying figure 1 of the specification, the present invention comprises a process for separating and recovering alkali and hemicellulose from a wastewater dope, comprising the steps of:
a. conveying a 100-square wastewater stock solution 21 (107 g/L of hemicellulose and 40g/L of alkali liquor) containing alkali and hemicellulose to a first-stage electrodialysis membrane system 1 for first-stage dealkalization.
b. The stock solution after dealkalization is divided into two parts, one part is 50-square high-alkali low-hemicellulose liquid (5 g/L hemicellulose, 44g/L alkali liquor), and the other part is 100-square low-alkali high-hemicellulose liquid (85 g/L hemicellulose, 18.5g/L alkali liquor). And (3) adding the low-alkali high-hemicellulose liquid into 30 parts of clear water and 70 parts of clear water filtered in the step f, mixing, and inputting into a nanofiltration membrane dealkalization system 2.
c. The nanofiltration membrane dealkalization system 2 separates the low-alkali high-hemicellulose liquid into two parts, wherein one part is 100-square concentrated high-hemicellulose liquid i (100 g/L hemicellulose and 11g/L alkali liquor), and the other part is 100-square filtered low-hemicellulose liquid i (5 g/L hemicellulose and 11g/L alkali liquor).
d. And c, dividing the low hemicellulose liquid i filtered out in the step c into two parts, wherein one part is a 50-square part, and mixing the two parts with the high-alkali low hemicellulose liquid in the first-stage electrodialysis system in the step a to obtain a first-stage mixed liquid.
e. And (c) mixing the 100-square concentrated high hemicellulose liquid i obtained in the step (c) with the other 50-square low hemicellulose liquid i obtained in the step (d), allowing the mixture to enter a second-stage electrodialysis membrane system 3, performing secondary electrodialysis, and separating again to obtain 100-square high hemicellulose liquid ii (100 g/L hemicellulose, 5g/L alkali liquor) and 50-square low hemicellulose liquid ii (5 g/L hemicellulose, 23g/L alkali liquor).
f. And e, inputting the 100-square high semi-fiber liquid ii obtained in the step e into a high-speed disc type separator 13 for separation and filtration, wherein the rotating speed of the high-speed disc type separator 13 is 10000 r/min. 30 square slag liquid (260 g/L of hemicellulose, 5g/L of alkali liquor) and 70 square clear liquid (31 g/L of hemicellulose, 5g/L of alkali liquor) are obtained through separation and filtration, and the slag liquid is recycled to realize the recycling of the hemicellulose.
And (3) mixing the primary mixed solution in the step (d) with the low hemicellulose liquid ii obtained in the step (e) to form a secondary mixed solution, namely mixing 50 parts of high-alkali low hemicellulose liquid (5 g/L hemicellulose, 44g/L alkali liquor) in the first-stage electrodialysis system, 50 parts of low hemicellulose liquid i (5 g/L hemicellulose, 11g/L alkali liquor) obtained in the step (c) and 50 parts of low hemicellulose liquid ii obtained in the step (e), and finally recovering 150 parts of alkali (5 g/L hemicellulose, 26g/L alkali liquor) to realize alkali liquor recovery.
39000Kg of alkali is finally recovered from 40000Kg of raw material, and the recovery rate is 97.5%; 107000Kg of semi-fiber is finally returned to the upstream textile fiber along with alkali for recycling 5000Kg, and the rest semi-fiber is completely recycled to enter the downstream xylose making industry, with the recovery rate of 95.3%.
Example 2
The invention comprises a method for separating and recovering alkali and hemicellulose from a wastewater stock solution 21, which comprises the following steps:
a. conveying a 100-square wastewater stock solution 21 (110 g/L of hemicellulose and 40g/L of alkali liquor) containing alkali and hemicellulose to a first-stage electrodialysis membrane system 1 for first-stage dealkalization.
b. The stock solution after dealkalization is divided into two parts, one part is 50-square high-alkali low-hemicellulose liquid (6 g/L hemicellulose, 42g/L alkali liquor), and the other part is 100-square low-alkali high-hemicellulose liquid (90 g/L hemicellulose, 18g/L alkali liquor). And (3) adding the low-alkali high-hemicellulose liquid into 30 parts of clear water and 70 parts of clear water filtered in the step f, mixing, and inputting into a nanofiltration membrane dealkalization system 2.
c. The nanofiltration membrane dealkalization system 2 separates the low-alkali high-hemicellulose liquid into two parts, wherein one part is 100-square concentrated high-hemicellulose liquid i (105 g/L hemicellulose and 10g/L alkali liquor), and the other part is 100-square filtered low-hemicellulose liquid i (6 g/L hemicellulose and 10g/L alkali liquor).
d. And c, equally dividing the low hemicellulose liquid i obtained in the step c into two parts, wherein one part is a 50-square part, and mixing the two parts with the high-alkali low hemicellulose liquid in the first-stage electrodialysis system in the step a to obtain a first-stage mixed liquid.
e. And (c) mixing the 100-square concentrated high hemicellulose liquid i obtained in the step (c) with the other 50-square low hemicellulose liquid i obtained in the step (d), allowing the mixture to enter a second-stage electrodialysis membrane system 3, performing secondary electrodialysis, and separating again to obtain 100-square high hemicellulose liquid ii (105 g/L hemicellulose, 6g/L alkali liquor) and 50-square low hemicellulose liquid ii (6 g/L hemicellulose, 20g/L alkali liquor).
f. And e, inputting the 100-square high hemicellulose liquid ii obtained in the step e into a high-speed disc type separator 13 for separation and filtration, wherein the rotating speed of the high-speed disc type separator 13 is 11000r/min to obtain 30-square slag liquid (270 g/L hemicellulose, 6g/L alkali liquor) and 70-square clear liquid (40 g/L hemicellulose, 6g/L alkali liquor), and recovering the slag liquid to realize the recovery of the hemicellulose.
And (3) mixing the primary mixed solution in the step (d) with the low hemicellulose liquid ii obtained in the step (e) to form a secondary mixed solution, namely mixing 50 parts of high-alkali low hemicellulose liquid (6 g/L hemicellulose, 42g/L alkali liquor) in the first-stage electrodialysis system, 50 parts of low hemicellulose liquid i (6 g/L hemicellulose, 10g/L alkali liquor) obtained in the step (c) and 50 parts of low hemicellulose liquid ii obtained in the step (e), and finally recovering 150 parts of alkali (6 g/L hemicellulose, 24g/L alkali liquor) to realize alkali liquor recovery.
40000Kg of alkali as raw material is finally recovered by 36000Kg, the recovery rate is 90%; 110000Kg of semi-fiber of raw materials is finally returned to the upstream textile fiber along with alkali for recycling 6000Kg, the rest semi-fiber is completely recycled to the downstream xylose making industry, and the recovery rate is 94.5%.
Example 3
Referring to the attached FIG. 2, as a basic embodiment of the present invention, the present invention comprises a method for separating and recovering alkali and hemicellulose from a wastewater dope 21, comprising the steps of:
a. conveying a 100-square wastewater stock solution 21 (100 g/L of hemicellulose and 44g/L of alkali liquor) containing alkali and hemicellulose to a first-stage electrodialysis membrane system 1 for first-stage dealkalization.
b. The stock solution after dealkalization is divided into two parts, one part is 50-square high-alkali low-hemicellulose liquid (4 g/L hemicellulose, 46g/L alkali liquor), and the other part is 100-square low-alkali high-hemicellulose liquid (80 g/L hemicellulose, 20g/L alkali liquor). And (3) adding 40 parts of clear water and 60 parts of clear liquid filtered in the step f into the low-alkali high-hemicellulose liquid, mixing, and inputting into a nanofiltration membrane dealkalization system 2.
c. The nanofiltration membrane dealkalization system 2 separates the low-alkali high-hemicellulose liquid into two parts, wherein one part is the high-hemicellulose liquid i (95 g/L hemicellulose and 14g/L alkali liquor) concentrated by a 100-square part, and the other part is the low-hemicellulose liquid i (4 g/L hemicellulose and 14g/L alkali liquor) filtered by the 100-square part.
d. And c, equally dividing the low hemicellulose liquid i obtained in the step c into two parts, wherein one part is a 50-square part, and mixing the two parts with the high-alkali low hemicellulose liquid in the first-stage electrodialysis system in the step a to obtain a first-stage mixed liquid.
e. And (c) mixing the 100-square concentrated high hemicellulose liquid i obtained in the step (c) with the other 50-square low hemicellulose liquid i obtained in the step (d), allowing the mixture to enter a second-stage electrodialysis membrane system 3, performing secondary electrodialysis, and separating again to obtain 100-square high hemicellulose liquid ii (95 g/L hemicellulose, 4g/L alkali liquor) and 50-square low hemicellulose liquid ii (4 g/L hemicellulose, 25g/L alkali liquor).
f. And (e) inputting the 100-square high hemicellulose liquid ii obtained in the step (e) into the ceramic membrane 14 for filtering to obtain 40-square slag liquid (240 g/L hemicellulose, 4g/L alkali liquor) and 60-square clear liquid (30 g/L hemicellulose, 4g/L alkali liquor), and recovering the slag liquid to realize the recovery of the hemicellulose.
And (3) mixing the primary mixed solution in the step (d) with the low hemicellulose liquid ii obtained in the step (e) to form a secondary mixed solution, namely mixing 50 parts of high-alkali low hemicellulose liquid (4 g/L hemicellulose, 46g/L alkali liquor) in the first-stage electrodialysis system, 50 parts of low hemicellulose liquid i (4 g/L hemicellulose, 14g/L alkali liquor) obtained in the step (c) and 50 parts of low hemicellulose liquid ii obtained in the step (e), and finally recovering 150 parts of alkali (4 g/L hemicellulose, 28.3g/L alkali liquor), thereby realizing alkali liquor recovery.
44000Kg of alkali as a raw material is finally recovered by 42450Kg, and the recovery rate is 96.4%; 100000Kg of semi-fiber raw material is finally returned to the upstream textile fiber along with alkali for recycling 4000Kg, the rest semi-fiber is completely recycled to the downstream xylose making industry, and the recovery rate is 96%.
Example 4
Referring to the attached figure 3 of the specification, the invention comprises a system for separating and recovering alkali and hemicellulose from a wastewater stock solution, which comprises a first-stage electrodialysis membrane system 1, a nanofiltration membrane dealkalization system 2, a second-stage electrodialysis membrane system 3, a first collecting box 4, a second collecting box 5, a water tank 19 and a high-speed disc type separator 13.
The high-alkali low-hemicellulose liquid outlet of the first-stage electrodialysis membrane system 1 is communicated with a first collecting box 4 through a first pipeline 6, the low-alkali high-hemicellulose liquid outlet of the first-stage electrodialysis membrane system 1 is communicated with a nanofiltration membrane dealkalization system 2 through a second pipeline 7, and the high-hemicellulose liquid outlet of the nanofiltration membrane dealkalization system 2 is communicated with a second-stage electrodialysis membrane system 3 through a third pipeline 9; and a low hemicellulose liquid outlet of the nanofiltration membrane dealkalization system 2 is communicated with the first pipeline 6 through a fourth pipeline 10. A branch 8 is further arranged on the fourth pipeline 10, and the other end of the branch 8 is communicated with a third pipeline 9. And a flow dividing valve for dividing flow equally is arranged at the joint of the branch 8 and the fourth pipeline 10. And a high-semi-fiber liquid outlet of the second-stage electrodialysis membrane system 3 is connected with a high-speed disc type separator 13 through a fifth pipeline 11. The high-speed disc type separator 13 is provided with a clear liquid outlet and a residue liquid outlet; the clear liquid outlet is communicated with the second pipeline 7 through a seventh pipeline 15, and the slag liquid outlet is communicated with the second collecting box 5 through an eighth pipeline 16. And the low hemicellulose liquid outlet of the second-stage electrodialysis membrane system 3 is communicated with the first pipeline 6 through a sixth pipeline 12.
The water tank 19 is connected with the second pipeline 7 through a water injection pipe 20, one end of the water injection pipe 20 is connected with the water tank 19, and the other end of the water injection pipe 20 is communicated with the second pipeline 7.
Example 5
Referring to the attached figure 4 of the specification, the invention comprises a system for separating and recovering alkali and hemicellulose from a wastewater stock solution, which comprises a first-stage electrodialysis membrane system 1, a nanofiltration membrane dealkalization system 2, a second-stage electrodialysis membrane system 3, a first collecting box 4, a second collecting box 5, a water tank 19 and a ceramic membrane 14.
The high-alkali low-hemicellulose liquid outlet of the first-stage electrodialysis membrane system 1 is communicated with a first collecting box 4 through a first pipeline 6, the low-alkali high-hemicellulose liquid outlet of the first-stage electrodialysis membrane system 1 is communicated with a nanofiltration membrane dealkalization system 2 through a second pipeline 7, and the high-hemicellulose liquid outlet of the nanofiltration membrane dealkalization system 2 is communicated with a second-stage electrodialysis membrane system 3 through a third pipeline 9; and a low hemicellulose liquid outlet of the nanofiltration membrane dealkalization system 2 is communicated with the first pipeline 6 through a fourth pipeline 10. A branch 8 is further arranged on the fourth pipeline 10, and the other end of the branch 8 is communicated with a third pipeline 9. And a high semi-fiber liquid outlet of the second-stage electrodialysis membrane system 3 is connected with a ceramic membrane 14 through a fifth pipeline 11. A clear liquid outlet and a residue liquid outlet are formed in each ceramic membrane 14; the clear liquid outlet is communicated with the second pipeline 7 through a seventh pipeline 15, and the slag liquid outlet is communicated with the second collecting box 5 through an eighth pipeline 16. And the low hemicellulose liquid outlet of the second-stage electrodialysis membrane system 3 is communicated with the first pipeline 6 through a sixth pipeline 12. The water tank 19 is connected with the second pipeline 7 through a water injection pipe 20, one end of the water injection pipe 20 is connected with the water tank 19, and the other end of the water injection pipe 20 is communicated with the second pipeline 7.
In summary, after reading the present disclosure, those skilled in the art should make various other modifications without creative efforts according to the technical solutions and concepts of the present disclosure, which are within the protection scope of the present disclosure.
Claims (10)
1. A method for separating and recovering alkali and hemicellulose from a wastewater stock solution is characterized by comprising the following steps: the method comprises the following steps:
a. conveying a wastewater stock solution (21) containing alkali and hemicellulose to a first-stage electrodialysis membrane system (1) for first-step dealkalization;
b. dividing the dealkalized stock solution into two parts, wherein one part is high-alkali low-hemicellulose solution, and the other part is low-alkali high-hemicellulose solution; adding water into the low-alkali high-hemicellulose liquid, mixing, and inputting into a nanofiltration membrane dealkalization system (2);
c. the nanofiltration membrane dealkalization system (2) separates the low-alkali high hemicellulose liquid into two parts, wherein one part is concentrated high hemicellulose liquid i, and the other part is filtered low hemicellulose liquid i;
d. dividing the low hemicellulose liquid i filtered out in the step c into two parts, and mixing one part with the high-alkali low hemicellulose liquid in the first-stage electrodialysis system in the step a to obtain a first-stage mixed liquid;
e. mixing the high hemicellulose liquid i concentrated in the step c with the other part of the low hemicellulose liquid i obtained in the step d, allowing the mixture to enter a second-stage electrodialysis membrane system (3), performing secondary electrodialysis, and separating again to obtain a high hemicellulose liquid ii and a low hemicellulose liquid ii;
f. mixing the primary mixed solution obtained in the step d with the low hemicellulose liquid ii obtained in the step e to form a secondary mixed solution, so as to realize alkali liquor recovery; e, filtering the high hemicellulose liquid ii in the step e again to obtain a slag liquid and a clear liquid, and recovering the slag liquid to realize the recovery of the hemicellulose; and (c) mixing the clear liquid with the low-alkali high-hemicellulose liquid obtained in the step (b) and the added water, and inputting the mixture into a nanofiltration membrane dealkalization system (2).
2. The method for separating and recovering alkali and hemicellulose from the waste water stock solution according to claim 1, characterized in that: in the step b, the water amount added into the low-alkali high-hemicellulose liquid is 30-40% of the volume of the low-alkali high-hemicellulose liquid.
3. The method for separating and recovering alkali and hemicellulose from the waste water stock solution according to claim 1, characterized in that: the step f of filtering the high hemicellulose liquid ii obtained in the step e again specifically comprises the following steps: the high hemicellulose liquid ii is input into a high-speed disc type separator (13) for separation and filtration.
4. The method for separating and recovering alkali and hemicellulose from the wastewater stock solution according to claim 3, characterized in that: the rotating speed of the high-speed disc type separator (13) is not lower than 10000 r/min.
5. The method for separating and recovering alkali and hemicellulose from the waste water stock solution according to claim 1, characterized in that: the step f of filtering the high hemicellulose liquid ii obtained in the step e again specifically comprises the following steps: the high hemicellulose liquid ii is fed into a ceramic membrane (14) for filtration.
6. The method for separating and recovering alkali and hemicellulose from the waste water stock solution according to claim 1, characterized in that: the content of alkali in the wastewater stock solution (21) containing alkali and hemicellulose is 40-44g/L, and the content of hemicellulose is 100-110 g/L; the content of alkali in the high-alkali low-hemicellulose liquid is 42-46g/L, and the content of hemicellulose is 4-6 g/L; the content of alkali in the low-alkali high-hemicellulose liquid is 18-20g/L, and the content of hemicellulose is 80-90 g/L; the alkali content in the concentrated high hemicellulose liquid i is 10-14g/L, and the hemicellulose content is 95-105 g/L; the content of alkali in the filtered low hemicellulose liquid i is 10-14g/L, and the content of hemicellulose is 4-6 g/L; the content of alkali in the high hemicellulose liquid ii is 4-6g/L, and the content of hemicellulose is 95-105 g/L; the content of alkali in the low hemicellulose liquid ii is 20-25g/L, and the content of hemicellulose is 4-6 g/L; the content of alkali in the slag liquid is 4-6g/L, and the content of hemicellulose is 240-270 g/L; the content of alkali in the clear liquid is 4-6g/L, and the content of hemicellulose is 30-40 g/L.
7. The method for separating and recovering alkali and hemicellulose from the waste water stock solution according to claim 1, characterized in that: and f, recycling the alkali liquor in the step f for recycling the textile fiber, and recycling the residue liquor into the downstream xylose production industry.
8. A system for separating and recovering alkali and hemicellulose from a wastewater stock solution is characterized in that: the device comprises a wastewater stock solution (21), a first-stage electrodialysis membrane system (1), a nanofiltration membrane dealkalization system (2), a second-stage electrodialysis membrane system (3), a first collecting box (4) and a second collecting box (5); the wastewater stock solution (21) is used for being introduced into a first-stage electrodialysis membrane system (1), a high-alkali low-hemicellulose liquid outlet of the first-stage electrodialysis membrane system (1) is communicated with a first collecting box (4) through a first pipeline (6), a low-alkali high-hemicellulose liquid outlet of the first-stage electrodialysis membrane system (1) is communicated with a nanofiltration membrane dealkalization system (2) through a second pipeline (7), and a high-hemicellulose liquid outlet of the nanofiltration membrane dealkalization system (2) is communicated with a second-stage electrodialysis membrane system (3) through a third pipeline (9); a low semi-fiber liquid outlet of the nanofiltration membrane dealkalization system (2) is communicated with the first pipeline (6) through a fourth pipeline (10); a branch (8) is further arranged on the fourth pipeline (10), and the other end of the branch (8) is communicated with the third pipeline (9); a high semi-fiber liquid outlet of the second-stage electrodialysis membrane system (3) is communicated with the second collecting box (5) through a fifth pipeline (11); and the low semi-fiber liquid outlet of the second-stage electrodialysis membrane system (3) is communicated with the first pipeline (6) through a sixth pipeline (12).
9. The system for separating and recovering alkali and hemicellulose from waste water stock solution according to claim 8, wherein: the device also comprises a high-speed disc type separator (13) or a ceramic membrane (14), one end of the fifth pipeline (11) is communicated with the high-half fiber liquid outlet of the second-stage electrodialysis membrane system (3), and the other end of the fifth pipeline is connected with the high-speed disc type separator (13) or the ceramic membrane (14); a clear liquid outlet and a residue liquid outlet are arranged on the high-speed disc type separator (13) or the ceramic membrane (14); the clear liquid outlet is communicated with the second pipeline (7) through a seventh pipeline (15), and the slag liquid outlet is communicated with the second collecting box (5) through an eighth pipeline (16).
10. The system for separating and recovering alkali and hemicellulose from waste water stock solution according to claim 9, wherein: the water injection device is characterized by further comprising a water tank (19) and a water injection pipe (20), wherein one end of the water injection pipe (20) is connected with the water tank (19), and the other end of the water injection pipe (20) is communicated with the second pipeline (7).
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