Bipolar membrane water inlet guarantee system for by-product salt of steel wastewater

Abstract

This invention provides a bipolar membrane inlet protection system for by-product salts from steel wastewater, comprising: a double-layered pipe body, both ends of which are sealed to form an inner cavity and an outer cavity; a wastewater inlet connected to the inner cavity in the middle of the double-layered pipe body; and filter ports connected to the outer cavity at both ends of the inner cavity; an ultrafiltration membrane roll fixed to the inner cavity; two spiral blades fixed to the outer cavity to guide the liquid discharged from the filter ports into the spiral channels formed by the spiral blades; and chelating resin densely distributed within the spiral channels; and an outlet pipe connected to the outer cavity in the middle of the double-layered pipe body. This technical solution integrates ultrafiltration membrane filtration and chelating resin adsorption into a single double-layered pipe structure, achieving continuous and integrated treatment for suspended solids removal and heavy metal adsorption. It eliminates the need for intermediate water tanks, multi-stage pump sets, and other supporting facilities found in separate processes, significantly shortening the process flow.

Description

Technical Field

[0001] This invention generally relates to the field of wastewater treatment, and specifically to a bipolar membrane inlet water protection system for by-product salts from steel wastewater. Background Technology

[0002] In the process of wastewater resource utilization in the steel industry, recovering by-product salts from pickling wastewater and further preparing high-purity acids and alkalis through bipolar membrane electrodialysis technology has become a key path to achieve "zero discharge" and resource recycling. However, the core bottleneck of this process lies in the extremely stringent requirements of the bipolar membrane for the quality of the influent. Its internal ion exchange layer and catalyst layer are highly susceptible to irreversible damage from trace impurities in the influent. By-product salt solutions in steel wastewater typically contain a large amount of suspended solids, colloids, and residual heavy metal ions such as copper, nickel, and zinc. If these impurities enter the bipolar membrane stack directly without deep purification, they will not only clog the membrane channels, leading to a sharp increase in energy consumption, but also undergo complexation or precipitation reactions with the functional groups within the membrane, causing increased membrane resistance, decreased current efficiency, and even permanent damage to the membrane structure. Therefore, how to construct an efficient and stable pretreatment barrier before bipolar membrane treatment to thoroughly remove suspended solids and heavy metal impurities is a common industry challenge to ensure the long-term stable operation of the bipolar membrane system and reduce the frequency of replacement of expensive membrane modules.

[0003] Currently, the mainstream pretreatment solutions for this problem mostly adopt a split-series process of "ultrafiltration membrane filtration + chelating resin adsorption." This involves first using an ultrafiltration unit to remove suspended solids and colloids, then pumping the permeate into a separate chelating resin column to remove heavy metal ions. While this traditional layout is technically mature, it has significant drawbacks in practical engineering applications: Firstly, the split design results in a lengthy process flow, requiring intermediate water tanks, multi-stage pump sets, and complex piping and valve systems. This not only increases land area and infrastructure investment but also significantly increases operating energy consumption due to hydraulic losses during multi-stage transport. Secondly, the operation and maintenance of the two independent units are difficult to coordinate. The frequent backwashing of the ultrafiltration membrane and the periodic acid-base regeneration cycle of the resin are mismatched, increasing the complexity of operation and control. Furthermore, intermediate connection points can easily become breeding grounds for microorganisms or secondary contamination. More seriously, if the upstream ultrafiltration membrane experiences even minor damage or seal failure, leaked colloidal particles can rapidly contaminate the downstream resin bed, causing the entire pretreatment system to fail. This, in turn, allows substandard water to impact the expensive downstream bipolar membrane stack, resulting in irreparable economic losses. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention provides a bipolar membrane inlet water protection system for by-product salts from steel wastewater, comprising: a double-layer pipe body, the two ends of which are sealed to form an inner cavity and an outer cavity; a wastewater inlet connected to the inner cavity is provided in the middle of the double-layer pipe body; and filter outlets connected to the outer cavity are provided at both ends of the inner cavity; an ultrafiltration membrane roll fixed to the inner cavity; two spiral blades fixed in the outer cavity for guiding the liquid discharged from the filter outlets into the spiral channel formed by the spiral blades; and chelating resin densely distributed in the spiral channel; and an outlet pipe connected to the outer cavity is provided in the middle of the double-layer pipe body.

[0005] With the aforementioned technical features, this invention integrates ultrafiltration membrane filtration and chelating resin adsorption into a single double-layer tube structure, achieving continuous and integrated treatment for suspended solids removal and heavy metal adsorption. This eliminates the need for intermediate water tanks, multi-stage pump sets, and other supporting facilities required in separate processes, significantly shortening the process flow, reducing land area and infrastructure investment, while also reducing hydraulic transport losses and saving operating energy. Furthermore, the seamless connection between filtration and adsorption processes avoids secondary pollution problems in intermediate connection links. Structurally, it also avoids the risk of resin bed contamination due to ultrafiltration membrane damage, effectively ensuring the quality of pretreated water and providing reliable support for the stable operation of the downstream bipolar membrane system.

[0006] In some embodiments, the double-layer tube body includes a middle tube, which is a coaxially arranged double-layer tube body, and two end tubes, which are detachably and sealingly connected to the two ends of the middle tube. This allows the double-layer tube body to adopt a split, detachable structure, facilitating the disassembly, cleaning, replacement, and maintenance of the inner ultrafiltration membrane roll and the outer spiral blades and chelating resin, reducing the difficulty and cost of equipment operation and maintenance, and improving the service life and operational flexibility of the equipment.

[0007] In some embodiments, the spiral blades are modularly configured, with inner sealing tubes fitted to the inner wall of the outer cavity and outer sealing tubes fitted to the outer wall of the outer cavity on both the inner and outer sides of the spiral blades. Each end of the inner and outer sealing tubes is fitted with a sealing mesh to shield the chelating resin. This creates a closed, modular adsorption space within the spiral channel, preventing the chelating resin from being lost or accumulating under the influence of water flow, ensuring the uniformity and effectiveness of heavy metal adsorption. It also allows for the modular assembly and disassembly of the spiral blades and chelating resin, further improving the maintenance efficiency of the internal components of the outer cavity. Furthermore, the fitted arrangement of the inner and outer sealing tubes with the outer cavity wall prevents short-circuiting of the water flow, ensuring that all the water to be treated passes through the spiral channel and fully contacts the chelating resin.

[0008] In some embodiments, a drain pipe is also provided in the middle of the double-layer tube body. The drain pipe is interconnected with the inner cavity and is coaxially arranged with the wastewater inlet. This allows suspended solids, colloids, and other impurities trapped by the ultrafiltration membrane roll to be directly discharged through the drain pipe, achieving timely cleaning of impurities and preventing their accumulation in the cavity that could clog the ultrafiltration membrane, thus ensuring the filtration efficiency and flux of the ultrafiltration membrane. Simultaneously, the coaxial structure allows for convection between the wastewater inlet and the impurity discharge, improving the discharge effect and reducing the frequency of ultrafiltration membrane backwashing. Furthermore, when excessive external wastewater supply pressure restricts filtration or excessive internal filtration pressure affects the filtration effect, the drain pipe can effectively regulate the internal filtration pressure, transferring some unfiltered liquid in a timely manner, preventing damage to the membrane module due to excessive pressure, and ensuring the safety and stability of the filtration process.

[0009] In some embodiments, the overall diameter of the ultrafiltration membrane roll is smaller than the inner diameter of the inner cavity. Multiple crescent-shaped water-distributing elements are provided on the inner wall of the inner cavity, abutting against the ultrafiltration membrane roll and squeezing it towards the drain pipe. This allows the water-distributing elements to provide uniform support and compression to the ultrafiltration membrane roll, preventing deformation and adhesion to the wall under water pressure, ensuring uniform water distribution on the ultrafiltration membrane surface, and improving filtration efficiency. Simultaneously, the crescent-shaped water-distributing elements guide the water flow within the cavity, allowing wastewater to flow fully through all areas of the ultrafiltration membrane roll, achieving filtration without dead zones. Furthermore, the squeezing action towards the drain pipe pushes trapped impurities towards the drain pipe, further improving drainage efficiency.

[0010] In some embodiments, each water distribution element has multiple connecting holes, forming a water storage area between adjacent water distribution elements. This allows the water storage area to temporarily store and evenly distribute the water flow within the cavity, avoiding uneven filtration caused by excessively fast or slow local flow rates. Simultaneously, the connecting holes ensure smooth water flow, allowing wastewater to gradually and fully contact the ultrafiltration membrane roll, improving the retention of suspended solids. Furthermore, the water storage area buffers the impact of water flow, reducing wear on the ultrafiltration membrane roll and extending its service life. Since the water distribution element is located on one side of the wastewater inlet, when wastewater enters the inner cavity from the inlet and directly impacts the ultrafiltration membrane roll, the liquid will flow evenly to both sides of the inner cavity under the obstruction and guidance of the water distribution element, preventing concentrated water flow impacting localized areas of the ultrafiltration membrane roll. This significantly increases the contact area and contact path between wastewater and the ultrafiltration membrane, effectively improving the contact efficiency between wastewater and the ultrafiltration membrane roll, further enhancing the overall filtration effect.

[0011] In some embodiments, the ultrafiltration membrane roll is an irregularly shaped piece, with the diameters at both ends of the ultrafiltration membrane roll being larger than the diameter at the middle. The size of the water separator is matched with the size of the ultrafiltration membrane roll, so that the size of the water separator gradually decreases near the end of the inner cavity.

[0012] This design allows the irregular shape of the ultrafiltration membrane roll to match the gradually changing dimensions of the water distribution element, adapting to the positions of the filter inlets at both ends of the inner cavity. This ensures that the permeate water filtered by the ultrafiltration membrane can flow evenly and smoothly from the filter inlets into the outer cavity, preventing localized stagnation of permeate water within the cavity. Simultaneously, it ensures that the ultrafiltration membrane roll is effectively supported by the water distribution element throughout the entire inner cavity, preventing damage to unsupported areas due to water pressure. Furthermore, to address the issue of some liquid entering the side storage area through the water distribution element, the variable diameter structure of the ultrafiltration membrane roll ensures that liquid in the side storage area must fully flow through the large-diameter filtration area at the end of the ultrafiltration membrane roll before flowing to the filter inlet. This prevents unfiltered liquid from directly entering the outer cavity through the filter inlet, ensuring that all liquid entering the outer cavity undergoes effective filtration by the ultrafiltration membrane, guaranteeing consistent filtered water quality.

[0013] In some embodiments, the exterior of the double-layered tube is provided with a drive mechanism that drives the double-layered tube to rotate around its own axis. The drive mechanism includes a frame, a wheel, the wheel being disposed on the frame and rotatably connected to the frame around the center of the wheel, the double-layered tube being fixed inside the wheel along the diameter direction of the wheel, and a drive assembly, the drive assembly being fixed on the frame and used to drive the wheel to rotate actively.

[0014] Therefore, the drive mechanism rotating the double-layer tube achieves dual optimization effects. Firstly, the centrifugal force generated by the rotation significantly improves the filtration efficiency of wastewater in the inner cavity, causing the liquid entering the inner cavity after filtration by the ultrafiltration membrane roll to quickly concentrate at both ends of the inner cavity, accelerating the flow rate of filtered water towards the filter outlet, and making it easier for trapped impurities to gather towards the central drain pipe, achieving a dual enhancement of filtration and sewage discharge. Secondly, the water flow disturbance caused by the rotation effectively slows down the flow efficiency of liquid in the outer cavity towards the central outlet pipe, prolonging the residence time of the liquid in the spiral channel, allowing the liquid to have a more complete and comprehensive contact reaction with the chelating resin, greatly improving the adsorption efficiency of heavy metal ions. At the same time, the rotational disturbance can also effectively prevent the chelating resin from clumping, ensuring that the adsorption performance of the resin remains stable, further guaranteeing the overall treatment effect.

[0015] In some embodiments, the drive assembly includes a drive motor fixed to the frame, an annular gear coaxially fixed to the outer periphery of the wheel, and a gear coaxially fixed to the output shaft of the drive electrode and meshing with the annular gear. Thus, the drive motor drives the wheel to rotate through the meshing of the gear and the annular gear. This transmission structure is stable and highly efficient, and the gear meshing allows for uniform rotation of the wheel, facilitating control of the rotation speed of the double-layered pipe and adapting to different water qualities and treatment capacities. Furthermore, this mechanical transmission structure has a low failure rate, is easy to maintain, and is suitable for continuous operation scenarios in industrial wastewater treatment.

[0016] In some embodiments, the spiral blades are spaced apart from the inner sealing pipe and the outer outer pipe by a dividing mesh to block the chelating resin. This allows the dividing mesh to segment the spiral channel, further preventing the chelating resin from shifting or accumulating under the influence of water flow and equipment rotation. This ensures a uniform filling amount of chelating resin in each segment of the spiral channel, allowing for more thorough and uniform contact between the water to be treated and the chelating resin, thus improving the overall effect of heavy metal adsorption. Simultaneously, the spacing of the dividing mesh does not affect the smooth flow of water, avoiding increased water flow resistance.

[0017] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of the bipolar membrane inlet water protection system for by-product salts from steel wastewater according to an embodiment of the present invention is shown.

[0019] Figure 2 This diagram illustrates the exploded structure of a double-layer pipe body in a bipolar membrane inlet water supply protection system for by-product salts from steel wastewater, according to an embodiment of the present invention.

[0020] Figure 3 An exploded view of the spiral blade module in the bipolar membrane inlet water supply protection system for by-product salts from steel wastewater, according to an embodiment of the present invention, is shown.

[0021] Figure 4 A schematic cross-sectional view of the double-layer pipe body in the bipolar membrane inlet water protection system for by-product salts from steel wastewater, according to an embodiment of the present invention, is shown.

[0022] Figure 5 A schematic diagram of the drive mechanism structure of the bipolar membrane inlet water protection system for by-product salts from steel wastewater according to an embodiment of the present invention is shown.

[0023] Symbol Explanation

[0024] 1. Double-layer tube body; 11. Middle tube; 12. End tube; 13. Wastewater inlet; 14. Sewage pipe; 15. Ultrafiltration membrane roll; 16. Outlet pipe; 17. Inner cavity; 18. Outer cavity; 21. Spiral blade; 22. Chelating resin; 23. Inner sealing tube; 24. Outer sealing tube; 25. Sealing net; 26. Dividing net; 3. Water distribution component; 31. Connecting hole; 4. Drive mechanism; 41. Frame; 42. Wheel; 43. Drive motor; 44. Ring tooth; 45. Gear. Detailed Implementation

[0025] The preferred embodiments (or implementation methods) of the present invention will now be described in detail with reference to the accompanying drawings.

[0026] The following is for reference. Figures 1-5 The present invention describes a bipolar membrane inlet protection system for by-product salts from steel wastewater.

[0027] Figure 1 A schematic diagram of the overall structure of the bipolar membrane inlet water protection system for by-product salts from steel wastewater, according to an embodiment of the present invention, is shown. Figure 2 An exploded view of the double-layer pipe body 1 in a bipolar membrane inlet water supply protection system for by-product salts from steel wastewater, according to an embodiment of the present invention, is shown. (Reference) Figure 1 As shown, the bipolar membrane inlet water protection system for by-product salts from steel wastewater disclosed in this embodiment includes a double-layer pipe body 1, an ultrafiltration membrane roll 15, spiral blades 21, and chelating resin 22. The two ends of the double-layer pipe body 1 are sealed to form an inner cavity 17 and an outer cavity 18. A wastewater inlet 13 is provided in the middle of the double-layer pipe body 1, which is connected to the inner cavity 17. Each end of the inner cavity 17 is provided with a filter port that is connected to the outer cavity 18. The ultrafiltration membrane roll 15 is fixed in the inner cavity 17. Two spiral blades 21 are provided and fixed in the outer cavity 18 to guide the liquid discharged from the filter port into the spiral channel formed by the spiral blades 21. The chelating resin 22 is densely distributed in the spiral channel. An outlet pipe 16 is provided in the middle of the double-layer pipe body 1, which is connected to the outer cavity 18.

[0028] The double-layer tube 1 is a coaxial double-layer hollow tubular structure and is the basic load-bearing component of the entire system. The inner cavity 17 is the wastewater filtration chamber, and the outer cavity 18 is the heavy metal adsorption chamber. The wastewater inlet 13 is the inflow channel for the wastewater to be treated, and the filter outlet is the transition channel for the product water after filtration in the inner cavity 17 to enter the outer cavity 18. The ultrafiltration membrane roll 15 is made of hollow fiber ultrafiltration membrane and is the core interception component for suspended solids and colloids. The spiral blade 21 is an arc-shaped guide blade, and its formed spiral channel is the guide path for the water flow in the outer cavity 18. The chelating resin 22 is an aminophosphate chelating functional resin and is the core adsorption medium for heavy metal ions. The outlet pipe 16 is the outflow channel for the purified water after adsorption in the outer cavity 18.

[0029] This structure integrates ultrafiltration membrane filtration and chelating resin 22 adsorption into a single double-layer tube 1, achieving continuous and integrated treatment for suspended solids removal and heavy metal adsorption. It eliminates the need for intermediate water tanks, multi-stage pump sets, and other supporting facilities required in separate processes, significantly shortening the process flow, reducing land area and infrastructure investment, while also reducing hydraulic transport losses and saving operating energy. The seamless connection between filtration and adsorption avoids secondary pollution problems in intermediate connection links, and the physical isolation structure of the double-layer tube 1 avoids the risk of resin bed contamination caused by ultrafiltration membrane damage, effectively ensuring the quality of pretreated water and providing reliable support for the stable operation of the downstream bipolar membrane system.

[0030] In some embodiments, the double-layer pipe body 1 includes a middle pipe 11 and end pipes 12. The middle pipe 11 is a coaxially arranged double-layer pipe body 1, and there are two end pipes 12, which are detachably and sealingly connected to the two ends of the middle pipe 11. The middle pipe 11 is the main body section of the double-layer pipe body 1 and is the core part forming the inner cavity 17 and the outer cavity 18. It is an integral coaxial double-layer structure to ensure the overall structural strength of the pipe body. The end pipes 12 are the end sealing sections of the double-layer pipe body 1, which adopt a double-layer sealing structure that matches the middle pipe 11. The detachable sealing connection method is a flange sealing connection, equipped with a sealing gasket and fastening bolts.

[0031] The split, detachable double-layer tube structure 1 facilitates the disassembly, cleaning, replacement, and maintenance of the ultrafiltration membrane roll 15 in the inner cavity 17 and the spiral blades 21 and chelating resin 22 in the outer cavity 18 without the need for complete equipment disassembly, reducing the difficulty and cost of equipment operation and maintenance. At the same time, the detachable and sealed connection method allows for quick disassembly and assembly according to usage requirements, improving the service life and operational flexibility of the equipment. Furthermore, the sealing structure effectively prevents wastewater leakage and ensures the airtightness of the equipment operation.

[0032] Figure 3 An exploded view of the spiral blade 21 module in a bipolar membrane influent protection system for by-product salts from steel wastewater, according to an embodiment of the present invention, is shown. (Reference) Figure 3 As shown, the spiral blade 21 is modularly designed. The inner and outer sides of the spiral blade 21 are respectively provided with an inner sealing tube 23 that fits against the inner wall of the outer cavity 18 and an outer sealing tube 24 that fits against the outer wall of the outer cavity 18. Both ends of the inner sealing tube 23 and the outer sealing tube 24 are provided with a sealing net 25 to block the chelating resin 22.

[0033] The spiral blade 21 is modularly designed as an integrally molded modular structure, which can be extracted and installed as a whole from the outer cavity 18; the inner sealing tube 23 and the outer sealing tube 24 are both rigid tubular structures, which are seamlessly and tightly fitted to the wall of the outer cavity 18; the sealing mesh 25 is a microporous mesh structure, whose mesh pore size is smaller than the particle size of the chelating resin 22, and the shielding method is full end-face coverage shielding.

[0034] This structure creates a closed, modular adsorption space within the spiral channel, effectively preventing the chelating resin 22 from being lost or accumulated under the action of water flow. This ensures uniform filling of chelating resin 22 in all areas of the spiral channel, guaranteeing the uniformity and effectiveness of heavy metal adsorption. The modular design allows for the modular assembly and disassembly of the spiral blades 21 and the chelating resin 22, further improving the maintenance efficiency of the internal components of the outer cavity 18. The seamless fit between the inner sealing tube 23, the outer sealing tube 24, and the wall of the outer cavity 18 prevents water flow short-circuiting, ensuring that all the water to be treated passes through the spiral channel and fully contacts the chelating resin 22, thus guaranteeing the adsorption effect.

[0035] In some embodiments, reference Figure 3 As shown, a segmentation mesh 26 is provided between the spiral blade 21 and the inner sealing tube and the outer outer tube to block the chelating resin 22. The segmentation mesh 26 has a microporous mesh structure with a pore size smaller than the particle size of the chelating resin 22. The mesh is evenly spaced along the axial direction of the spiral channel. The segmentation mesh 26 is integrally molded with the spiral blade 21, the inner sealing tube 23, and the outer sealing tube 24, resulting in high structural strength. The blocking method is a segmented blocking of the spiral channel, dividing the overall spiral channel into multiple independent adsorption sub-channels.

[0036] The dividing mesh 26 can segment the spiral channel, further preventing the chelating resin 22 from shifting or accumulating under the action of water flow and equipment rotation, ensuring that the filling amount of chelating resin 22 in each segment of the spiral channel is uniform, allowing the water to be treated to contact the chelating resin 22 more fully and evenly, and improving the overall effect of heavy metal adsorption; at the same time, the spacing of the dividing mesh 26 is set to be equally spaced and transparent, which will not affect the smooth flow of water, avoid increasing water flow resistance, and ensure the guiding efficiency of water flow in the outer cavity 18.

[0037] In some embodiments, reference Figure 2 As shown, a sewage pipe 14 is also provided in the middle of the double-layer pipe body 1. The sewage pipe 14 is interconnected with the inner cavity 17 and is coaxially arranged with the wastewater inlet 13. The sewage pipe 14 is a rigid tubular sewage discharge channel. Its connection with the inner cavity 17 is a central through-type connection. The pipe is equipped with a sewage control valve to realize the adjustment of sewage flow. The coaxial arrangement with the wastewater inlet 13 is a coaxial center-corresponding arrangement, and the pipe diameter of the sewage pipe 14 matches that of the wastewater inlet 13.

[0038] Suspended solids, colloids, and other impurities filtered and trapped by the ultrafiltration membrane roll 15 can be directly discharged through the drain pipe 14, enabling timely cleaning of impurities and preventing their accumulation in the cavity that could clog the ultrafiltration membrane, thus ensuring the filtration efficiency and flux of the ultrafiltration membrane. The coaxial structure allows the wastewater inlet and impurity discharge to form axial convection, accelerating the collection speed of impurities towards the drain pipe 14, improving the discharge effect, and reducing the frequency of ultrafiltration membrane backwashing. In addition, when the external sewage supply pressure is too high, limiting the filtration state, or when the filtration pressure in the inner cavity 17 is too high, affecting the filtration effect, the drain pipe 14 can effectively regulate the filtration pressure in the inner cavity 17, transferring some unfiltered liquid in a timely manner, preventing the membrane module from being damaged due to excessive pressure, and ensuring the safety and stability of the filtration process.

[0039] Figure 4 A schematic cross-sectional view of the double-layer pipe body 1 is shown in the bipolar membrane inlet water protection system for by-product salts from steel wastewater according to an embodiment of the present invention. (Reference) Figure 4As shown, the overall diameter of the ultrafiltration membrane roll 15 is smaller than the inner diameter of the inner cavity 17. The inner wall of the inner cavity 17 is provided with multiple crescent-shaped water distribution parts 3 that abut against the ultrafiltration membrane roll 15 and squeeze the ultrafiltration membrane roll 15 toward the drain pipe 14.

[0040] The overall diameter of the ultrafiltration membrane roll 15 is clearance-fitted with the inner diameter of the inner cavity 17, leaving space for water flow and installation; the water distribution component 3 is a crescent-shaped sheet structure made of elastic rubber, and the number is adapted to the pipe diameter of the inner cavity 17. The abutment method is elastic tight abutment, and the squeezing towards the sewage pipe 14 is slight elastic squeezing, with the force evenly distributed on the outer wall of the ultrafiltration membrane roll 15.

[0041] The water distribution element 3 can provide uniform support and compression for the ultrafiltration membrane roll 15, preventing the ultrafiltration membrane roll 15 from deforming or sticking to the wall under water pressure, ensuring uniform water distribution on the surface of the ultrafiltration membrane, and improving the filtration effect. The crescent-shaped water distribution element 3 can guide the water flow in the cavity, allowing wastewater to flow fully through all areas of the ultrafiltration membrane roll 15, achieving filtration without dead corners. Furthermore, the squeezing action towards the drain pipe 14 can push the trapped impurities towards the drain pipe 14, helping to improve the sewage discharge efficiency and accelerate the discharge speed of impurities.

[0042] In some embodiments, each water distribution element 3 is provided with multiple connecting holes 31, so that a water storage area is formed between adjacent water distribution elements 3. The connecting holes 31 are through-hole structures on the water distribution element 3, and the diameter and number of holes are adapted to the size of the water distribution element 3 and are distributed in a uniform array. The water storage area is the gap space between adjacent water distribution elements 3, which is formed by the water distribution element 3, the inner wall of the inner cavity 17, and the outer wall of the ultrafiltration membrane roll 15. It is an open temporary storage space and is interconnected with the connecting holes 31.

[0043] The water storage area allows for the temporary storage and uniform distribution of water flow within the cavity, preventing uneven filtration caused by excessively fast or slow local flow rates and ensuring the stability of the filtration effect. Simultaneously, the connecting hole 31 ensures smooth water flow, allowing wastewater to gradually and fully contact the ultrafiltration membrane, improving the removal of suspended solids. Furthermore, the water storage area buffers water flow impact, reducing mechanical wear on the ultrafiltration membrane and extending its service life. Meanwhile, the water separator 3 is located on one side of the wastewater inlet 13. When wastewater enters the inner cavity 17 from the inlet and directly impacts the ultrafiltration membrane, the liquid will flow evenly to both sides of the inner cavity 17 under the obstruction and guidance of the water separator 3, preventing concentrated water flow from impacting localized areas of the ultrafiltration membrane. This significantly increases the contact area and path between the wastewater and the ultrafiltration membrane, effectively improving the contact efficiency and further enhancing the overall filtration effect.

[0044] In some embodiments, the ultrafiltration membrane roll 15 is an irregularly shaped part, with the diameters at both ends of the ultrafiltration membrane roll 15 being larger than the diameter at the middle. The size of the water separator 3 matches the size of the ultrafiltration membrane roll 15, so that the size of the water separator 3 gradually decreases near the end of the inner cavity 17. The ultrafiltration membrane roll 15 has a drum-shaped irregular structure, with the large-diameter sections at both ends being filtration enhancement sections with denser membrane fiber distribution, and the small-diameter section in the middle being a transition section. The size of the water separator 3 matches the shape and thickness of the ultrafiltration membrane roll 15, and the size of the water separator 3 gradually decreases near the end of the inner cavity 17, with the axial length shortening and the radial thickness thinning, adapting to the large-diameter structure at the end of the ultrafiltration membrane roll 15.

[0045] The irregular shape of the ultrafiltration membrane roll 15, combined with the gradually changing size of the water distribution element 3, can adapt to the positions of the filter ports at both ends of the inner cavity 17, allowing the permeate water filtered by the ultrafiltration membrane to enter the outer cavity 18 evenly and smoothly from the filter ports, avoiding local stagnation of permeate water within the cavity; at the same time, it ensures that the ultrafiltration membrane roll 15 is effectively supported by the water distribution element 3 throughout the entire inner cavity 17, preventing damage to unsupported areas due to water flow pressure; furthermore, for cases where some liquid enters the side storage area through the water distribution element 3, the variable diameter structure of the ultrafiltration membrane roll 15 ensures that the liquid in the side storage area must fully flow through the large-diameter filtration area at the end of the ultrafiltration membrane roll 15 before flowing to the filter port, preventing the liquid in the side storage area from directly entering the outer cavity 18 without sufficient filtration, ensuring that all liquid entering the outer cavity 18 undergoes effective filtration by the ultrafiltration membrane, and guaranteeing the consistency of the filtered water quality.

[0046] Figure 5 A schematic diagram of the drive mechanism 4 in the bipolar membrane influent protection system for by-product salts from steel wastewater, according to an embodiment of the present invention, is shown. (Refer to...) Figure 5 As shown, a drive mechanism 4 is provided on the outside of the double-layer tube 1 to drive the double-layer tube 1 to rotate around its own axis. The drive mechanism 4 includes a frame 41, a wheel 42, and a drive assembly. The wheel 42 is disposed on the frame 41 and is rotatably connected to the frame 41 around the center of the wheel 42. The double-layer tube 1 is fixed inside the wheel 42 along the diameter direction of the wheel 42. The drive assembly is fixed on the frame 41 and is used to drive the wheel 42 to rotate actively.

[0047] The frame 41 is a support frame welded from steel profiles, with leveling pads at the bottom to ensure the stability of the support; the wheel 42 is a circular rotating disc, and its rotational connection with the frame 41 is a bearing-type rotational connection; the double-layer tube 1 is fixed by a clamp-type fastening to ensure coaxiality during rotation; the drive component is the power output component of the wheel 42, which can realize the uniform active rotation of the wheel 42, driving the double-layer tube 1 to rotate around its own axis.

[0048] The drive mechanism 4 rotates the double-layer tube 1, achieving a dual optimization effect. Firstly, the centrifugal force generated by the rotation significantly improves the filtration efficiency of wastewater in the inner cavity 17, driving the liquid that has entered the inner cavity 17 after filtration by the ultrafiltration membrane roll 15 to quickly concentrate at both ends of the inner cavity 17, accelerating the flow rate of filtered water towards the filter outlet, and making it easier for trapped impurities to gather towards the central drain pipe 14, achieving a dual enhancement of filtration and sewage discharge. Secondly, the water flow disturbance formed by the rotation effectively slows down the flow efficiency of liquid in the outer cavity 18 towards the central outlet pipe 16, prolonging the residence time of the liquid in the spiral channel, allowing the liquid to have a more complete and comprehensive contact reaction with the chelating resin 22, greatly improving the adsorption efficiency of heavy metal ions. At the same time, the rotational disturbance can also effectively prevent the chelating resin 22 from clumping, ensuring that the adsorption performance of the resin remains stable, further guaranteeing the overall treatment effect.

[0049] In some embodiments, the drive assembly includes a drive motor 43, an annular gear 44, and a gear 45. The drive motor 43 is fixed to the frame 41. The annular gear 44 is coaxially fixed to the outer periphery of the wheel 42. The gear 45 is coaxially fixed to the output shaft of the drive electrode and meshes with the annular gear 44. The drive motor 43 is a variable frequency speed control motor, fixed to the frame 41 by a motor mount, which can realize stepless speed adjustment. The annular gear 44 is an integral annular gear structure, and its connection with the wheel 42 is a bolt-fastened coaxial connection. The gear 45 is a precision transmission gear, and its connection with the output shaft of the drive motor 43 is a key-type coaxial connection. Its meshing with the annular gear 44 is a precision clearance meshing to ensure smooth transmission.

[0050] The drive motor 43 drives the wheel 42 to rotate through the meshing transmission of gear 45 and ring tooth 44. The meshing transmission structure of gear 45 is stable and has high transmission efficiency, and can achieve uniform rotation of wheel 42. It is convenient to accurately control the rotation speed of double-layer pipe 1 according to actual working conditions. It can be flexibly adapted to the water quality concentration and treatment volume of the wastewater to be treated. By adjusting the speed, impurities are prevented from accumulating at both ends of the pipe body, while ensuring the stability of liquid flow in the spiral blade 21, meeting different process requirements. At the same time, the mechanical transmission structure has a low failure rate, and daily maintenance only requires lubrication, which is convenient and suitable for continuous operation scenarios of industrial wastewater treatment.

[0051] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A bipolar membrane influent protection system for by-product salts from steel wastewater, characterized in that, include: A double-layer pipe body (1) is provided with sealed ends to form an inner cavity (17) and an outer cavity (18). A wastewater inlet (13) is provided in the middle of the double-layer pipe body (1) and communicates with the inner cavity (17). A filter port communicating with the outer cavity (18) is provided at each end of the inner cavity (17). An ultrafiltration membrane roll (15) is fixed to the inner cavity (17). Two spiral blades (21) are provided and fixed inside the outer cavity (18) to guide the liquid discharged from the filter outlet into the spiral channel formed by the spiral blades (21). Chelating resin (22), wherein the chelating resin (22) is densely distributed within the spiral channel; The middle part of the double-layered pipe (1) is provided with a water outlet pipe (16) that communicates with the outer cavity (18).

2. The bipolar membrane influent protection system for by-product salt from steel wastewater according to claim 1, characterized in that, The double-layered tube (1) includes The central tube (11) is a double-layered tube (1) arranged coaxially. Two end tubes (12) are provided and are detachably and sealed to the two ends of the middle tube (11).

3. The bipolar membrane influent protection system for by-product salts from steel wastewater according to claim 2, characterized in that, The spiral blade (21) is modularly configured. The inner and outer sides of the spiral blade (21) are respectively provided with an inner sealing tube (23) that fits against the inner wall of the outer cavity (18) and an outer sealing tube (24) that fits against the outer wall of the outer cavity (18). Each end of the inner sealing tube (23) and the outer sealing tube (24) is provided with a sealing net (25) to block the chelating resin (22).

4. The bipolar membrane influent protection system for by-product salt from steel wastewater according to claim 1, characterized in that, The middle part of the double-layer pipe body (1) is also provided with a sewage pipe (14), which is connected to the inner cavity (17) and is coaxially arranged with the wastewater inlet (13).

5. The bipolar membrane influent protection system for by-product salts from steel wastewater according to claim 4, characterized in that, The overall diameter of the ultrafiltration membrane roll (15) is smaller than the inner diameter of the inner cavity (17). The inner wall of the inner cavity (17) is provided with multiple crescent-shaped water distribution parts (3) that abut against the ultrafiltration membrane roll (15) and squeeze the ultrafiltration membrane roll (15) toward the sewage pipe (14).

6. The bipolar membrane influent protection system for by-product salts from steel wastewater according to claim 5, characterized in that, Each of the water distribution components (3) has multiple connecting holes (31) so that a water storage area is formed between adjacent water distribution components (3).

7. The bipolar membrane influent protection system for by-product salts from steel wastewater according to claim 6, characterized in that, The ultrafiltration membrane roll (15) is an irregularly shaped part. The diameters at both ends of the ultrafiltration membrane roll (15) are larger than the diameter in the middle. The size of the water separator (3) matches the size of the ultrafiltration membrane roll, so that the size of the water separator (3) near the end of the inner cavity (17) gradually decreases.

8. The bipolar membrane influent protection system for by-product salts from steel wastewater according to claim 1, characterized in that, The double-layer tube (1) is provided with a drive mechanism (4) on its outside, which drives the double-layer tube (1) to rotate around its own axis. The drive mechanism (4) includes Frame (41), A wheel (42) is mounted on the frame (41) and is rotatably connected to the frame (41) around the center of the wheel (42). The double-layer tube (1) is fixed inside the wheel (42) along the diameter direction of the wheel (42). A drive assembly, which is fixed on the frame (41), is used to drive the wheel (42) to rotate actively.

9. The bipolar membrane influent protection system for by-product salts from steel wastewater according to claim 8, characterized in that, The driving component includes A drive motor (43) is fixed to the frame (41). The annular tooth (44) is coaxially fixed to the outer peripheral region of the wheel (42). Gear (45), which is coaxially fixed to the output shaft of the drive electrode and meshes with the ring tooth (44).

10. The bipolar membrane influent protection system for by-product salts from steel wastewater according to claim 3, characterized in that, The spiral blade (21) is provided with a dividing mesh (26) that blocks the chelating resin (22) between it and the inner sealing tube and the outer outer tube.

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