A device for membrane filtration of a salt-depleted waste liquid

Abstract

The utility model relates to water treatment technical field, the utility model provides a kind of salt solution waste liquid membrane filter back device, it includes ultrafiltration device and nanofiltration unit. Ultrafiltration device can intercept macromolecular impurities in salt solution waste liquid, filter salt solution waste liquid into first thick liquid and first clear liquid, first thick liquid is used to input to environmental protection or sludge treatment device, first clear liquid is input to nanofiltration unit. Through the synergistic effect of ultrafiltration and nanofiltration, the stepwise interception of different particle size pollutants in salt solution waste liquid is realized, the purification of waste salt water can be realized without inputting a large amount of water, and the impurity content in salt solution waste liquid is reduced. Through the above technical scheme, the technical problem of consuming a large amount of water resources to treat macromolecular impurities in salt solution waste liquid in the prior art is solved.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of water treatment technology, specifically to a membrane filtration and reuse device for salt hydrolysis waste liquid. Background Technology

[0002] The production of heparin sodium generates a large amount of protein-containing brine. After enzymatic hydrolysis, this protein-containing brine leaves behind a large amount of organic suspended matter, and due to the characteristics of the production process, the brine has a high salt content, forming a complex salting-out waste liquid.

[0003] Currently, the treatment of such waste liquids often relies on biological processes. However, high salt content strongly inhibits the activity of microorganisms in the biological system, preventing the waste liquid from directly entering the biological treatment stage. To meet the water quality requirements of biological treatment, traditional methods often require the addition of large amounts of fresh water for dilution. This not only results in a significant waste of water resources and increases treatment costs, but also increases the load on subsequent treatment systems due to the substantial increase in the total volume of waste liquid after dilution. Meanwhile, if the residual organic suspended solids after enzymatic hydrolysis are not removed beforehand, they will aggregate and precipitate during treatment, potentially clogging the treatment equipment and affecting the efficiency and stability of the biochemical reaction, resulting in poor treatment effects and difficulty in achieving ideal purification standards. Furthermore, existing treatment technologies have a low degree of recovery and utilization of useful components in the waste liquid, with most being directly discharged, wasting resources and potentially causing environmental pollution. Therefore, how to efficiently treat this type of high-salt, high-organic-suspended waste liquid generated during heparin sodium production, while reducing water consumption and achieving effective purification and resource recovery, has become an urgent problem to be solved in the industry. Utility Model Content

[0004] To overcome the above-mentioned defects, embodiments of this utility model provide a membrane filtration and reuse device for salting waste liquid, which solves the technical problem that requires a large amount of water resources to treat macromolecular impurities in salting waste liquid in the prior art.

[0005] According to one aspect, at least one embodiment of the present invention provides a membrane filtration and reuse device for salt hydrolysis waste liquid, including an ultrafiltration device and a nanofiltration unit. The ultrafiltration device is used to remove large molecular impurities. The salt hydrolysis waste liquid filtered by the ultrafiltration device is divided into a first concentrated liquid and a first clear liquid. The first concentrated liquid is used to be input into an environmental protection or sludge treatment device, and the first clear liquid is input into the nanofiltration unit.

[0006] For example, in at least one embodiment of this utility model, a membrane filtration and reuse device for salting-out waste liquid is provided, wherein the nanofiltration unit is used to treat the first clarified liquid to filter it into a second concentrated liquid and a second clarified liquid, and the second concentrated liquid is transported back to the ultrafiltration device for reuse.

[0007] For example, in at least one embodiment of the present invention, a membrane filtration and reuse device for salting waste liquid is provided, which further includes an electrodialysis unit. The electrodialysis unit is used to receive the second clear liquid and process the second clear liquid to obtain fresh water and a third concentrated liquid.

[0008] For example, in at least one embodiment of the present invention, a membrane filtration and recycling device for salting waste liquid is provided, which further includes a catalytic oxidation unit for treating the third concentrated liquid to obtain fresh water that can be produced and used.

[0009] For example, in at least one embodiment of the present invention, a membrane filtration and reuse device for salting-out waste liquid is provided, wherein the ultrafiltration device includes: Membrane shell; An ultrafiltration membrane is disposed within the membrane housing and is used to filter macromolecular substances in the salting waste liquid. Wastewater pipe, located at the bottom of the ultrafiltration device, is used to introduce salting waste liquid into the membrane housing; A water purification pipe is disposed at the end of the membrane housing away from the wastewater pipe. The water purification pipe is connected to the interior of the ultrafiltration membrane and is used to discharge the purified water filtered by the ultrafiltration membrane. A concentrate pipe is disposed on the membrane housing and located on the same side as the water purification pipe. The concentrate pipe is used to discharge the concentrate retained by the ultrafiltration device.

[0010] For example, in at least one embodiment of the present invention, a membrane filtration reuse device for salting waste liquid is provided, which further includes an end plate for fixing the ultrafiltration membrane. The end plate divides the membrane shell into a water collection chamber and a filtration chamber. The ultrafiltration membrane is located in the ultrafiltration chamber and communicates with the water collection chamber. The purified water pipe communicates with the water collection chamber. The concentrated water pipe passes through the end plate and communicates with the ultrafiltration chamber.

[0011] For example, in at least one embodiment of the present invention, a membrane filtration reuse device for salt hydrolysis waste liquid is provided, which further includes: A water guide pipe is connected to the concentrate pipe and is located at the center of a plurality of ultrafiltration membranes. The water guide pipe is provided with a plurality of circumferentially distributed openings, which face the ultrafiltration membranes. A drain pipe is located at the bottom of the membrane housing.

[0012] For example, in a membrane filtration reuse device for salt hydrolysis waste liquid provided in at least one embodiment of the present invention, a sliding plate is provided inside the water expansion pipe, the peripheral wall of the sliding plate abuts against the peripheral wall of the water expansion pipe, and the sliding plate can slide along the circumference of the water expansion pipe under the push of the water flow.

[0013] For example, in a membrane filtration reuse device for salt hydrolysis waste liquid provided in at least one embodiment of this utility model, the opening is a conical flared opening.

[0014] For example, in a salt hydrolysis waste liquid membrane filtration recycling device provided in at least one embodiment of the present invention, the membrane shell has an elliptical cross section along the longitudinal direction to reflect water sprayed through the opening in different directions.

[0015] The beneficial effects of the embodiments of this utility model are as follows: In this invention, the salting-out waste liquid generated during the production of heparin sodium can be efficiently treated through the synergistic effect of an ultrafiltration device and a nanofiltration unit, resulting in significant beneficial effects. Ultrafiltration units can specifically remove large amounts of organic suspended solids and other macromolecular impurities from wastewater, separating the salting-out wastewater into a first concentrated liquid and a first clarified liquid. The first concentrated liquid can be directly fed into environmental protection or sludge treatment units for centralized disposal, avoiding equipment clogging caused by the aggregation and sedimentation of organic suspended solids in subsequent treatment, thus ensuring the stability of the treatment process. The first clarified liquid, having removed macromolecular impurities, can directly enter a nanofiltration unit for advanced treatment without relying on large amounts of fresh water for dilution, reducing water consumption at the source, lowering treatment costs, and avoiding the problem of increased total wastewater volume due to dilution, thereby reducing the load on subsequent treatment systems. Furthermore, through the staged filtration of ultrafiltration and nanofiltration, impurities in high-salt and high-organic suspended solids wastewater are removed in a stepwise manner, improving the purification efficiency of the salting wastewater and creating favorable conditions for subsequent treatment (such as biochemical processes). This effectively improves the treatment effect of the salting wastewater while reducing water consumption. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0017] Figure 1 This is a cleaning process diagram of a membrane filtration and recycling device for salt hydrolysis waste liquid in one embodiment of the present invention; Figure 2 for Figure 1 A partial structural schematic diagram of the ultrafiltration component in the embodiment; Figure 3 for Figure 1 A schematic diagram of the water guide pipe structure of the ultrafiltration component in the embodiment; Figure 4 for Figure 1 A partial structural schematic diagram of the ultrafiltration component in the embodiment; Figure 5This is a cross-sectional view of the water guide pipe of a membrane filtration device for salt hydrolysis waste liquid recycling in one embodiment of the present invention.

[0018] In the diagram: 101, membrane housing; 102, ultrafiltration membrane; 103, wastewater pipe; 104, purified water pipe; 105, concentrate pipe; 106, end plate; 107, filtration chamber; 108, water collection chamber; 109, water guide pipe; 1091, opening; 110, slide plate; 111, drain pipe. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0020] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0021] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] like Figures 1-5 As shown, it illustrates a membrane filtration device for recycling salt hydrolysis waste liquid in one embodiment of the present invention.

[0026] In some examples, ultrafiltration units and nanofiltration units are connected via pipelines to form a series treatment system. The wastewater pipe 103 of the ultrafiltration unit is connected to the salting-out wastewater source generated during the heparin sodium production process. The salting-out wastewater enters the membrane housing 101 via the wastewater pipe 103. Inside the membrane housing 101, the salting-out wastewater comes into contact with the ultrafiltration membrane 102. Large molecular impurities are retained by the ultrafiltration membrane 102, forming a first concentrate. This first concentrate is discharged through the concentrate pipe 105 and transported to an environmental protection or sludge treatment device. The first clear liquid, passing through the ultrafiltration membrane 102, is discharged through the purified water pipe 104 and directly fed into the inlet of the nanofiltration unit. After receiving the first clear liquid, the nanofiltration unit further filters it, completing the initial classification and purification process of the salting-out wastewater. Through a rational pipeline layout, the entire system achieves continuous treatment of the salting-out wastewater from ultrafiltration to nanofiltration, completing the retention and separation of large molecular impurities without the need for an additional dilution step. Ultrafiltration units trap large molecular impurities to prevent clogging of subsequent equipment and ensure system stability; nanofiltration units directly treat the first clarified liquid, eliminating the need for additional water dilution, reducing total water consumption and lowering treatment costs. The two-stage membrane synergy achieves stepwise removal of impurities: ultrafiltration targets suspended solids, while nanofiltration targets ionic substances, improving purification efficiency and creating favorable conditions for subsequent processes. This structure controls wastewater increments at the source, reducing system load.

[0027] The nanofiltration unit has two discharge paths: one connects to the inlet of the ultrafiltration unit via a pipeline, and the other is an independent discharge path. After the first clarified liquid enters the nanofiltration unit, it is processed to form a second concentrated liquid and a second clarified liquid. The second concentrated liquid is returned to the inlet of the ultrafiltration unit via a pipeline, mixed with the salting-out waste liquid to be treated, and then re-enters the ultrafiltration unit. The second clarified liquid is discharged through the independent discharge path. The return of the second concentrated liquid to the ultrafiltration unit for secondary treatment further removes impurities that were not completely separated, improving the overall impurity removal rate. Simultaneously, it reduces waste liquid discharge, improves resource utilization through recycling, and reduces material waste.

[0028] The feed end of the electrodialysis unit is connected to the discharge path of the second clarified solution of the nanofiltration unit. After the second clarified solution enters the electrodialysis unit, it is processed and separated into desalinated water and a third concentrated solution. The desalinated water is discharged from one discharge end of the electrodialysis unit, and the third concentrated solution is discharged from the other discharge end. The electrodialysis unit can reduce the salt content of the second clear liquid by treating it, so that the produced fresh water can meet the needs of use in scenarios with lower salinity and expand the scope of water resource reuse; the separation of the third concentrated liquid enables the centralized treatment of salt and avoids the environmental impact caused by the direct discharge of high-salinity solutions.

[0029] The feed end of the catalytic oxidation unit is connected to the discharge end of the third concentrate from the electrodialysis unit. After entering the catalytic oxidation unit, the third concentrate is treated to form fresh water suitable for production and discharged from the discharge end of the catalytic oxidation unit. The catalytic oxidation unit can decompose organic pollutants in the third concentrate that are difficult to remove by physical methods, so that the treated water quality meets the standards for production water, realizing deep purification and resource utilization of wastewater, reducing the use of fresh water resources, and lowering the cost of production water.

[0030] The ultrafiltration device includes a membrane housing 101, an ultrafiltration membrane 102, a wastewater pipe 103, a purified water pipe 104, and a concentrate pipe 105. The membrane housing 101 is a hollow cavity, and the ultrafiltration membrane 102 is disposed inside the membrane housing 101. The wastewater pipe 103 is located at the bottom of the membrane housing 101 and communicates with the interior of the membrane housing 101 for introducing salting-out waste liquid. The purified water pipe 104 is located at the end of the membrane housing 101 away from the wastewater pipe 103 and communicates with the interior of the ultrafiltration membrane 102 for discharging the filtered purified water. The concentrate pipe 105 is located on the membrane housing 101 and on the same side as the purified water pipe 104, and communicates with the interior of the membrane housing 101 for discharging the retained concentrate. Salting waste liquid enters membrane housing 101 through sewage pipe 103. Under the action of ultrafiltration membrane 102, macromolecules are intercepted to form concentrated water, which is discharged through concentrated water pipe 105. The purified water that passes through ultrafiltration membrane 102 is discharged through purified water pipe 104 and enters nanofiltration unit.

[0031] The membrane housing 101 provides a closed space for the ultrafiltration process, and the ultrafiltration membrane 102 can specifically filter large molecules to improve filtration accuracy. The layout of the wastewater pipe 103, the purified water pipe 104 and the concentrate pipe 105 makes the flow paths of waste liquid, purified water and concentrate clear, realizes efficient separation and improves the treatment efficiency of the ultrafiltration device.

[0032] An end plate 106 is disposed inside the membrane housing 101, dividing the membrane housing 101 into a water collection chamber 108 and a filtration chamber 107. The ultrafiltration membrane 102 is located inside the filtration chamber 107, and one end of it is connected to the water collection chamber 108; the purified water pipe 104 is connected to the water collection chamber 108; and the concentrate pipe 105 passes through the end plate 106 and is connected to the filtration chamber 107. The end plate 106 serves to fix the ultrafiltration membrane 102, ensuring its stability during the filtration process; the water collection chamber 108 can collect the purified water produced by each ultrafiltration membrane 102, making the water output from the purified water pipe 104 more stable; the filtration chamber 107 provides an independent space for the filtration of salting waste liquid, reducing external interference; the design of the concentrate pipe 105 passing through the end plate 106 shortens the concentrate discharge path and improves the concentrate discharge efficiency.

[0033] The ultrafiltration membrane 102 has a tubular structure, with multiple ultrafiltration membranes 102 arranged parallel to each other in a bundle within the filtration chamber 107 of the membrane housing 101. One end of each ultrafiltration membrane 102 is connected to the end plate 106, and the opening at this end is connected to the water collection chamber 108. The other end is fixed to the inner wall at the bottom of the membrane housing 101 and is in a closed state to prevent unfiltered waste liquid from directly entering the membrane. The ultrafiltration membrane 102 has a porous wall structure, with pore sizes that allow small molecules and water to permeate while effectively retaining large molecular impurities and organic suspended solids. The uniform pore distribution of the wall ensures that the liquid can stably pass through the membrane wall and enter the membrane during filtration. This arrangement and connection of multiple ultrafiltration membranes 102 increases the contact area with the salting-out waste liquid, improving filtration efficiency, and also allows the filtered first clear liquid to smoothly flow into the water collection chamber 108 and then be discharged through the purified water pipe 104.

[0034] The water guide pipe 109 is connected to the concentrate pipe 105 and is located at the center of several ultrafiltration membranes 102. The water guide pipe 109 has multiple circumferentially distributed openings 1091, which face the ultrafiltration membranes 102. The drain pipe 111 is located at the bottom of the membrane housing 101 and is connected to the inside of the membrane housing 101. The water guide pipe 109 sprays fluid into the ultrafiltration membranes 102 through the openings 1091, which can rinse the surface of the ultrafiltration membranes 102, reduce the adhesion of large molecular impurities on the membrane surface, and slow down the membrane fouling rate. The drain pipe 111 can discharge the waste liquid after rinsing in a timely manner, ensuring the cleanliness of the inside of the membrane housing 101, maintaining the filtration performance of the ultrafiltration membranes 102, and extending their service life.

[0035] A sliding plate 110 is provided inside the water guide pipe 109. The peripheral wall of the sliding plate 110 abuts against the peripheral wall of the water guide pipe 109 and can slide downward along the water guide pipe 109 under the push of the water flow. When the water flows downward along the water guide pipe 109, the sliding plate 110 will create resistance to the water flow, reducing the water flow velocity and thus reaching the bottom of the water guide pipe 109 and the relevant areas inside the membrane housing 101 more slowly. This process prolongs the contact time of the water flow in the water guide pipe 109 and the contact area with the ultrafiltration membrane 102, allowing the water flow to more fully flush the surface of the ultrafiltration membrane 102, improving the flushing effect and reducing the deposition of organic suspended matter on the membrane surface. The conical flared opening 1091 allows the sprayed fluid to diffuse over a larger range, more comprehensively covering the surface of the ultrafiltration membrane 102, improving the flushing uniformity, reducing membrane fouling caused by inadequate local flushing, and further maintaining the filtration efficiency of the ultrafiltration membrane 102.

[0036] The filtration process of the ultrafiltration unit is carried out according to the following procedure: The salting-out waste liquid generated during the heparin sodium production process enters the membrane housing 101 through the wastewater pipe 103. Under the action of pressure difference, the waste liquid flows towards the ultrafiltration membrane 102. The ultrafiltration membrane 102 plays a role in retaining large molecular impurities and organic suspended solids in the waste liquid. These retained substances gradually accumulate in the filtration chamber 107 of the membrane housing 101 to form the first concentrate. The first concentrated liquid is discharged through the concentrated water pipe 105 installed on the membrane housing 101 and is transported to an environmental protection or sludge treatment device for further treatment. The portion filtered by the ultrafiltration membrane 102, that is, the first clear liquid with the removal of large molecular impurities, enters the interior of the ultrafiltration membrane 102 and flows into the water collection chamber 108 through the connection between the ultrafiltration membrane 102 and the water collection chamber 108. The first clear liquid collected in the water collection chamber 108 is then discharged from the membrane housing 101 through the purified water pipe 104 connected to the water collection chamber 108, and subsequently transported to the nanofiltration unit for further treatment. Throughout the filtration process, the end plate 106 fixes the ultrafiltration membrane 102, ensuring that it maintains a stable filtration state under the action of waste liquid flow and pressure, so that the filtration work can be carried out continuously and efficiently.

[0037] The cleaning of ultrafiltration components can be carried out in the following three ways: The first cleaning method involves water entering through the concentrate pipe 105 and exiting through the wastewater pipe 103 via the guide pipe 109. The specific process is as follows: When cleaning begins, clean water enters the guide pipe 109 from the concentrate pipe 105. The water flows downwards along the guide pipe 109, and its velocity decreases due to the resistance of the slide plate 110. The slide plate 110 slides axially along the guide pipe 109 under the push of the water flow. The water is sprayed onto the surface of the ultrafiltration membrane 102 through the opening 1091 on the guide pipe 109, washing away impurities adhering to the membrane surface. The water then collects inside the membrane housing 101 and exits through the wastewater pipe 103 at the bottom, completing the cleaning cycle. This method can clean the impurities adsorbed on the outer surface of the ultrafiltration membrane 102.

[0038] The second cleaning method involves water entering through the wastewater pipe 103 and exiting through the drain pipe 111. During cleaning, the cleaning water is directly introduced into the bottom of the membrane housing 101 through the inlet pipe, flowing upwards along the inside of the membrane housing 101. The slide plate 110 slides axially along the water guide pipe 109 under the push of the water flow. The water flow is sprayed onto the surface of the ultrafiltration membrane 102 through the opening 1091 on the water guide pipe 109, washing away impurities attached to the membrane surface. Subsequently, the water flow collects inside the membrane housing 101 and exits through the drain pipe 111 at the bottom. This method can rinse the inner wall of the membrane housing 101 and the outer surface of the ultrafiltration membrane 102.

[0039] The third cleaning method: Water enters through the purified water pipe 104 and exits through the wastewater pipe 103. The cleaning water enters the interior of the ultrafiltration membrane 102 through the purified water pipe 104 and flows outward from the water outlet on the ultrafiltration membrane 102, flushing out impurities attached to the outer surface of the ultrafiltration membrane. Subsequently, the water flows into the membrane housing 101, collects, and is discharged through the wastewater pipe 103, thus preventing impurities from clogging the membrane pores and ensuring unobstructed filtration channels.

[0040] The membrane housing 101 has an elliptical cross-section along its longitudinal direction. This structure allows water ejected through the opening 1091 to be reflected in different directions. The elliptical cross-section of the membrane housing 101 expands the coverage area of ​​the water flow through reflection, allowing more area of ​​the ultrafiltration membrane 102 surface to be flushed, enhancing the flushing effect, further delaying membrane fouling, and ensuring the long-term stable operation of the ultrafiltration device.

[0041] In the wastewater treatment process of heparin sodium production, this device and method are implemented in the following manner: First, the ultrafiltration unit, as the starting point of the treatment, receives salting-out waste liquid or enzymatic hydrolysis waste liquid (hereinafter collectively referred to as "production waste liquid"). The production waste liquid is transported to the ultrafiltration unit through pipelines. Under the action of the ultrafiltration membrane 102 module, large molecular impurities, colloids, etc. are intercepted, forming a 10% concentrated liquid. This concentrated liquid is discharged through pipelines and can be directly sent to the environmental protection treatment or sludge disposal system. The 90% clear liquid that has passed through the ultrafiltration membrane 102 is transported to the nanofiltration unit through pipelines.

[0042] Next, the nanofiltration unit performs deep filtration on the ultrafiltration solution. After 90% of the solution enters the nanofiltration unit, it is separated by the nanofiltration membrane to further remove small molecule organic matter and some divalent salts, producing 95% clarified solution, which is then transported to the electrodialysis unit through pipelines. The concentrated solution produced during the nanofiltration process is returned to the front end of the ultrafiltration unit through a return pipeline, mixed with the newly entering production waste liquid, and participates in the ultrafiltration cycle again, improving the utilization rate of effective components in the waste liquid.

[0043] Subsequently, the electrodialysis unit desalinates the nanofiltration solution. 95% of the solution enters the dilute and concentrate chambers of the electrodialysis unit. Driven by an electric field, ions migrate directionally through the ion exchange membrane. The dilute chamber produces desalinated water (the desalinated solution), which can be reused in the production process (e.g., as a supplement to process water) via pipelines. The concentrate chamber forms concentrated water with a salt content of 13%, which is transported to the catalytic oxidation unit via pipelines.

[0044] Finally, the catalytic oxidation unit performs deep purification of the electrodialysis concentrate. The concentrate with a salt content of 13% enters the catalytic oxidation reaction chamber and comes into contact with the catalyst (such as a precious metal supported catalyst or an advanced oxidation catalyst) packed inside. Under catalytic action, the recalcitrant organic matter is oxidized and decomposed into small molecules or harmless components such as CO2 and H2O. The treated water that meets the standards is then transported back to the production system through pipelines for direct use as production water, thus realizing a closed loop of wastewater resource utilization.

[0045] Through the aforementioned continuous series of ultrafiltration-nanofiltration-electrodialysis-catalytic oxidation processes, the production waste liquid undergoes four stages of treatment in sequence. Each unit works in concert to achieve the retention of macromolecular impurities and the removal of salts, as well as the deep oxidation of recalcitrant organic matter. Ultimately, the waste liquid is transformed into a reusable resource, achieving the goal of efficient treatment and resource utilization of heparin sodium production waste liquid.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A membrane filtration and reuse device for salt hydrolysis waste liquid, characterized in that, It includes an ultrafiltration device and a nanofiltration unit. The ultrafiltration device is used to remove large molecular impurities. The salting waste liquid filtered by the ultrafiltration device is divided into a first concentrated liquid and a first clear liquid. The first concentrated liquid is used to be fed into an environmental protection or sludge treatment device, and the first clear liquid is fed into the nanofiltration unit. The ultrafiltration device includes: Membrane shell (101); An ultrafiltration membrane (102) is disposed inside the membrane housing (101) and is used to filter macromolecular substances in the salting waste liquid. Wastewater pipe (103) is located at the bottom of the ultrafiltration device and is used to introduce salting waste liquid into the membrane housing (101); A water purification pipe (104) is disposed at one end of the membrane housing (101) away from the sewage pipe (103). The water purification pipe (104) is connected to the interior of the ultrafiltration membrane (102). The water purification pipe (104) is used to discharge the purified water filtered by the ultrafiltration membrane (102). A concentrate pipe (105) is disposed on the membrane housing (101) and located on the same side as the purified water pipe (104). The concentrate pipe (105) is used to discharge the concentrate retained by the ultrafiltration device.

2. The membrane filtration and reuse device for salt hydrolysis waste liquid according to claim 1, characterized in that, The nanofiltration unit is used to process the first clarified liquid to filter it into a second concentrated liquid and a second clarified liquid, and the second concentrated liquid is sent back to the ultrafiltration device for reuse.

3. The salt hydrolysis waste liquid membrane filtration and reuse device according to claim 2, characterized in that, It also includes an electrodialysis unit, which is used to receive the second clear liquid to process the second clear liquid to obtain fresh water and a third concentrated liquid.

4. The salt hydrolysis waste liquid membrane filtration and reuse device according to claim 3, characterized in that, It also includes a catalytic oxidation unit for treating the third concentrate to obtain usable fresh water.

5. The salt hydrolysis waste liquid membrane filtration and reuse device according to claim 1, characterized in that, It also includes an end plate (106) for fixing the ultrafiltration membrane (102). The end plate (106) divides the membrane housing (101) into a water collection chamber (108) and a filtration chamber (107). The ultrafiltration membrane (102) is located in the filtration chamber (107) and communicates with the water collection chamber (108). The purified water pipe (104) communicates with the water collection chamber (108). The concentrated water pipe (105) passes through the end plate (106) and communicates with the filtration chamber (107).

6. The membrane filtration and reuse device for salt hydrolysis waste liquid according to claim 1, characterized in that, Also includes: A water guide pipe (109) is connected to the concentrate pipe (105) and located at the center of a plurality of ultrafiltration membranes (102). The water guide pipe (109) is provided with a plurality of circumferentially distributed openings (1091) facing the ultrafiltration membranes (102). Drain pipe (111) is located at the bottom of membrane shell (101).

7. The membrane filtration and reuse device for salt hydrolysis waste liquid according to claim 6, characterized in that, The water guide pipe (109) is provided with a sliding plate (110), the peripheral wall of the sliding plate (110) abuts against the peripheral wall of the water guide pipe (109), and the sliding plate (110) can slide along the circumference of the water guide pipe (109) under the push of the water flow.

8. The membrane filtration and reuse device for salt hydrolysis waste liquid according to claim 6, characterized in that, The opening (1091) is a tapered flare.

9. A membrane filtration and reuse device for salt hydrolysis waste liquid according to claim 6, characterized in that, The membrane shell (101) has an elliptical cross section along the longitudinal direction to reflect water sprayed through the opening (1091) in different directions.

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