Recovery system and method for ion exchange water production regeneration wastewater

Abstract

The invention relates to the technical field of wastewater retreatment, and provides an ion exchange water production regeneration wastewater recovery system and method. The ion exchange water production regenerated wastewater recovery system comprises an ion exchange water production regenerated wastewater pretreatment device, a salt separation device and a resource utilization device. The ion exchange water-making regenerated wastewater pretreatment device is used for removing impurities in regenerated wastewater; the salt separation device is communicated with the ion exchange water production regeneration wastewater pretreatment device and is used for carrying out nanofiltration separation on the regeneration wastewater to obtain a monovalent salt solution and a divalent salt solution and treating sulfate ions in the divalent salt solution; and the resource utilization device is communicated with the salt separation device and is used for preparing acid and alkali from the monovalent salt solution. According to the invention, the defect of low resource utilization rate of the ion exchange water-making regeneration wastewater in the prior art is overcome, the ion exchange water-making regeneration wastewater recovery system and method are realized, and the ion exchange water-making regeneration wastewater can be subjected to resource recovery to prepare acid and alkali.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater reprocessing, and in particular to a system and method for recovering wastewater from ion exchange water production and regeneration. Background Art

[0002] Ion exchange water production technology is one of the current methods for industrial production of desalted water. The principle of water production is to use resin ion exchange to adsorb other anions and cations in the water. After the adsorption is saturated, acid and alkali are used for desorption and regeneration. The ion exchange pure water production rate is above 95%.

[0003] The quality of ion exchange water regeneration wastewater is very complex and needs to be treated before discharge. The current method is to use the regeneration wastewater for blast furnace slag and power plant fly ash treatment, while blast furnace slag, converter slag and power plant fly ash can be used in concrete production.

[0004] However, the chloride ion content in the ion exchange water regeneration wastewater is too high, which affects the quality of the water slag used in lime production. Considering the comprehensive economic benefits, it is necessary to design an ion exchange water regeneration wastewater recovery system and method to recover the ion exchange water regeneration wastewater as a resource to produce acid and alkali. Summary of the invention

[0005] The present invention provides an ion exchange water regeneration wastewater recovery system and method, which are used to solve the defect of low resource utilization rate in the ion exchange water regeneration wastewater in the prior art, and realize an ion exchange water regeneration wastewater recovery system and method, which can recover the ion exchange water regeneration wastewater as a resource to produce acid and alkali.

[0006] The present invention provides an ion exchange water production regeneration wastewater recovery system, comprising: Ion exchange water regeneration wastewater pretreatment device, used to remove impurities in regeneration wastewater; A salt separation device, connected to the ion exchange water production regeneration wastewater pretreatment device, for performing nanofiltration on the regeneration wastewater to separate a monovalent salt solution and a divalent salt solution, and treating sulfate ions in the divalent salt solution; The resource utilization device is connected to the salt separation device and is used for preparing acid and alkali from the monovalent salt solution.

[0007] According to an ion exchange water production regeneration wastewater recovery system provided by the present invention, the salt separation device comprises: A nanofiltration component is connected to the ion exchange water production regeneration wastewater pretreatment device and is used to perform nanofiltration on the regeneration wastewater to separate a monovalent salt solution and a divalent salt solution; A room temperature crystallization reaction component, connected to the nanofiltration component, for treating sulfate ions in the divalent salt solution; The SRB component is connected to the room temperature crystallization reaction component and is used for further processing the sulfate ions in the divalent salt solution.

[0008] According to an ion exchange water production regeneration wastewater recovery system provided by the present invention, the nanofiltration component comprises: A first nanofiltration component, comprising a first water inlet pipe, a first water production pipe and a first concentrated water pipe which are interconnected, wherein the first water inlet pipe is connected to the ion exchange water production and regeneration wastewater pretreatment device; A second nanofiltration component comprises a second water inlet pipe, a second water production pipe and a second concentrated water pipe which are interconnected, wherein the second water inlet pipe is connected to the first water production pipe; the second nanofiltration component is used to separate the monovalent salt solution, and the monovalent salt solution flows out through the second water production pipe; A third nanofiltration component comprises a third water inlet pipeline, a third water production pipeline and a third concentrated water pipeline which are interconnected, wherein the first concentrated water pipeline and the second concentrated water pipeline are both connected to the third water inlet pipeline, and the third concentrated water pipeline is connected to the first water production pipeline; the third nanofiltration component is used to separate the divalent salt solution, and the divalent salt solution flows out through the third water production pipeline, and the third water production pipeline is connected to the room temperature crystallization reaction component; A pressure pump is provided in the third water inlet pipe to drive the circulation of the regenerated wastewater.

[0009] According to an ion exchange water production regeneration wastewater recovery system provided by the present invention, the resource utilization device comprises: a first reverse osmosis component, in communication with the second water production pipeline, for concentrating the monovalent salt solution to a first concentration; an ultrafiltration membrane assembly, connected to the first reverse osmosis assembly, for filtering the monovalent salt solution; a second reverse osmosis component, in communication with the ultrafiltration membrane component, for concentrating the monovalent salt solution to a second concentration; The bipolar membrane electrodialysis component is connected to the second reverse osmosis component and is used to process the monovalent salt solution of the second concentration and produce sodium hydroxide and hydrochloric acid.

[0010] According to an ion exchange water production regeneration wastewater recovery system provided by the present invention, the salt separation device also includes a water production pump, a heat exchanger, a security filter and a nanofiltration circulation pump which are connected in sequence; The produced water pump is connected to the ion exchange water production and regeneration wastewater pretreatment device, and the nanofiltration circulation pump is connected to the first water inlet pipeline; The third water production pipeline is communicated with the divalent salt water tank, and the second water production pipeline is communicated with the monovalent salt water tank.

[0011] According to an ion exchange water production regeneration wastewater recovery system provided by the present invention, the first reverse osmosis component is connected to the monovalent salt water tank, and the first reverse osmosis component and the monovalent salt water tank are sequentially connected with a first water supply pump, a first filter and a second water supply pump.

[0012] According to an ion exchange water production regeneration wastewater recovery system provided by the present invention, a concentrate tank and a third water supply pump are connected in sequence between the first reverse osmosis component and the ultrafiltration membrane component, and a first circulation pipeline is provided between the ultrafiltration membrane component and the concentrate tank.

[0013] According to an ion exchange water production regeneration wastewater recovery system provided by the present invention, the ultrafiltration membrane assembly and the second reverse osmosis assembly are sequentially connected with an ultrafiltration water production tank, a fourth water supply pump, a second filter and a fifth water supply pump.

[0014] According to an ion exchange water production regeneration wastewater recovery system provided by the present invention, a reverse osmosis water tank, a sixth water supply pump and a circulating water supply pump are connected in sequence between the second reverse osmosis component and the bipolar membrane electrodialysis component, and a second circulation pipeline is also provided between the circulating water supply pump and the bipolar membrane electrodialysis component.

[0015] The present invention further provides an ion exchange water production regeneration wastewater recovery method, which is implemented based on the ion exchange water production regeneration wastewater recovery system described in any one of the above embodiments. The ion exchange water production regeneration wastewater recovery method comprises: Removing impurities in the regeneration wastewater by using the ion exchange water regeneration wastewater pretreatment device; The regenerated wastewater after impurities are removed is subjected to nanofiltration by the salt separation device to separate a monovalent salt solution and a divalent salt solution, and sulfate ions in the divalent salt solution are treated; The monovalent salt solution is processed by the resource utilization device to produce acid and alkali.

[0016] The ion exchange water regeneration wastewater recovery system provided by the present invention realizes the effective removal of impurities in the regeneration wastewater, the separation of salts and the reuse of resources through the ion exchange water regeneration wastewater pretreatment device, the salt separation device and the resource utilization device. The present invention solves the problems of incomplete impurity removal, difficulty in effective separation of salt mixture and waste of resources in the traditional regeneration wastewater treatment process.

[0017] The ion exchange water production regeneration wastewater recovery method provided by the present invention is implemented based on the above-mentioned ion exchange water production regeneration wastewater recovery system, and therefore also has the above-mentioned corresponding advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the mechanism of the ion exchange water production regeneration wastewater recovery system provided by the present invention.

[0020] Figure 2 It is a structural schematic diagram of the nanofiltration component of the ion exchange water production regeneration wastewater recovery system provided by the present invention.

[0021] Figure 3 It is a working principle diagram of the ion exchange water production regeneration wastewater pretreatment device of the ion exchange water production regeneration wastewater recovery system provided by the present invention.

[0022] Figure 4 The present invention provides a working principle diagram of a salt separation device of an ion exchange water production regeneration wastewater recovery system.

[0023] Figure 5 It is a working principle diagram of the resource utilization device of the ion exchange water production regeneration wastewater recovery system provided by the present invention.

[0024] Figure 6 It is a cross-sectional view of a sedimentation tank of the ion exchange water production regeneration wastewater recovery system provided by the present invention.

[0025] Figure 7 It is a top view of the sedimentation tank of the ion exchange water production regeneration wastewater recovery system provided by the present invention.

[0026] Figure 8 It is a cross-sectional view of the ion exchange component of the ion exchange water production regeneration wastewater recovery system provided by the present invention.

[0027] Fig. 9 It is a schematic diagram of the structure of the strong oxidizer of the ion exchange water production regeneration wastewater recovery system provided by the present invention.

[0028] Fig.10 It is a structural schematic diagram of a tubular reactor of an ion exchange water production regeneration wastewater recovery system provided by the present invention.

[0029] Reference numerals: 100: ion exchange water regeneration wastewater pretreatment device; 200: salt separation device; 300: resource utilization device; 210: nanofiltration component; 220: room temperature crystallization reaction component; 230: SRB component; 310: first reverse osmosis component; 320: ultrafiltration membrane component; 330: second reverse osmosis component; 340: bipolar membrane electrodialysis component; 211: first nanofiltration component; 212: second nanofiltration component; 213: third nanofiltration component; 214: pressure pump; 110: wastewater regulating tank; 120: normal temperature crystallization reactor; 130: sedimentation tank; 140: precision filter; 150: self-cleaning filter; 160: ultrafiltration component; 170: ion exchange component; 180: strong oxidizer; 190: ultrafiltration water production tank; 131: sedimentation shell; 1311: shell body; 1312: first water inlet pipe; 1313: water distribution tank; 1314: toothed weir; 1315: mud discharge pipe; 132: sedimentation component; 1321: support plate; 1322: inclined pipe; 1323: internal water collection tank; 1324: bearing platform; 133: cleaning component; 1331: motor; 1332: rotating rod; 1333: scraper; 134: external water receiving tank; 135: first water production pipe; 1711: exchange housing; 1712: first filter plate; 1713: second filter plate; 1714: third filter plate; 1721: first cavity; 1722: second cavity; 1723: third cavity; 1724: fourth cavity; 1731: first single-sided filter cap; 1732: double-sided filter cap; 1733: second single-sided filter cap; 174: second water inlet pipe; 175: baffle; 176: porous plate; 177: second water production pipe; 1781: weak acid cation resin layer; 1782: white ball resin grease layer; 1783: chelating resin layer; 181: tube reactor; 1811: water inlet pipe; 1812: packing reaction tube; 1813: reagent input pipe; 1814: arc connecting pipe; 182: oxidation water tank; 1821: water supply component; 1822: ozone generator; 1823: pipeline ejector; 1824: circulating water pump; 183: oxygen release tank; 1831: nitrogen explosion component; 1832: lifting pump; 1833: tail gas absorber; 184: ejector; 185: hydrogen peroxide dosing component. DETAILED DESCRIPTION

[0030] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0033] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0035] Combine the following Figure 1-Figure 10 The structure and working principle of the present invention are described.

[0036] Reference Figure 1 The present invention provides an ion exchange water regeneration wastewater recovery system, which includes an ion exchange water regeneration wastewater pretreatment device 100, a salt separation device 200 and a resource utilization device 300. The ion exchange water regeneration wastewater pretreatment device 100 is used to remove impurities in the regeneration wastewater; the salt separation device 200 is connected to the ion exchange water regeneration wastewater pretreatment device 100, and is used to perform nanofiltration on the regeneration wastewater to separate the monovalent salt solution and the divalent salt solution, and to treat the sulfate ions in the divalent salt solution; the resource utilization device 300 is connected to the salt separation device 200, and is used to prepare acid and alkali from the monovalent salt solution.

[0037] The present invention realizes effective removal of impurities in regenerated wastewater, separation of salts and reuse of resources through its three core components, namely, ion exchange water regeneration wastewater pretreatment device 100, salt separation device 200 and resource utilization device 300. The present invention solves the problems of incomplete removal of impurities, difficulty in effective separation of mixed salts and waste of resources in the traditional regenerated wastewater treatment process.

[0038] Specifically, first, the ion exchange water regeneration wastewater pretreatment device 100 is responsible for removing most of the impurities in the regeneration wastewater. This device includes multiple processing units, such as a normal temperature crystallization reactor, a sedimentation tank, a filtration component, etc., to ensure that the wastewater entering the subsequent treatment steps has been preliminarily purified. After pretreatment, the impurity content in the regeneration wastewater is significantly reduced, providing high-quality water inlet conditions for subsequent nanofiltration separation.

[0039] Next, the salt separation device 200 is connected to the ion exchange water regeneration wastewater pretreatment device 100 to perform nanofiltration separation on the pretreated regeneration wastewater. In this process, the salt separation device 200 can separate the wastewater into a monovalent salt solution and a divalent salt solution, and specifically treat the sulfate ions in the divalent salt solution. This separation method not only improves the purity of the salts, but also simplifies the subsequent treatment process, so that different types of salts can be more effectively treated or recycled.

[0040] Finally, the resource utilization device 300 is used to process the monovalent salt solution separated by the salt separation device 200. The device converts the monovalent salt solution into acid and alkali through a series of chemical treatment processes. This step not only realizes the recycling of resources and reduces waste emissions, but also creates valuable chemicals and improves the economic benefits of the entire system.

[0041] In the above structure, the close cooperation between the components solves several key problems in the treatment of regenerated wastewater. The ion exchange water regeneration wastewater pretreatment device 100 ensures that the wastewater has been fully purified before entering the salt separation device 200, avoiding the influence of impurities on the nanofiltration membrane. The salt separation device 200 uses precise nanofiltration separation technology to achieve effective separation of salts, especially the treatment of sulfate ions, laying the foundation for subsequent resource utilization. The resource utilization device 300 further converts the separated monovalent salt solution into acid and alkali, realizing the maximum utilization of resources.

[0042] Reference Figure 1 In some embodiments of the present invention, the salt separation device 200 includes a nanofiltration component 210, a room temperature crystallization reaction component 220, and an SRB (Sulfate-Reducing Bacteria) component 230. The nanofiltration component 210 is connected to the ion exchange water production regeneration wastewater pretreatment device 100, and is used to perform nanofiltration on the regeneration wastewater to separate the monovalent salt solution and the divalent salt solution; The room temperature crystallization reaction component 220 is connected to the nanofiltration component 210 and is used to process sulfate ions in the divalent salt solution; the room temperature crystallization reaction component 220 adds calcium oxide slurry and utilizes the reaction of calcium ions and sulfate ions to generate calcium sulfate precipitation to remove sulfate. Due to the co-solubility principle of calcium sulfate and sodium chloride, the solubility of calcium sulfate deviates, and the co-crystallization principle of the room temperature crystallizer is adopted to promote the precipitation and growth of calcium sulfate crystals.

[0043] The SRB component 230 is connected to the room temperature crystallization reaction component 220, and is used to further treat the sulfate ions in the divalent salt solution. The SRB component 230 further decomposes and removes the sulfate ions by using sulfate-reducing bacteria. Sulfate-reducing bacteria are strictly anaerobic heterotrophic organisms, and oxygen and organic matter need to be isolated during the treatment process. The SRB component 230 includes a folded plate anaerobic reactor and a flocculation sedimentation tank. A certain concentration of polyacrylamide is added to the water inlet of the anaerobic reactor. The polyacrylamide provides carbon and nitrogen sources for the bacteria, and the remaining part participates in the flocculation and sedimentation reaction, and the residual amount is low.

[0044] In this embodiment, the salt separation device 200 is designed to ensure that different types of salts can be efficiently separated and specific ions such as sulfate ions can be effectively treated by accurately separating and treating the regenerated wastewater. The device includes a nanofiltration component 210, a room temperature crystallization reaction component 220, and a sulfate-reducing bacteria reaction component, and these three components are connected in sequence to form a continuous and efficient treatment process.

[0045] First, the nanofiltration component 210 is connected to the ion exchange water production regeneration wastewater pretreatment device 100 to receive the regeneration wastewater that has been preliminarily purified. The nanofiltration component 210 uses nanofiltration membrane technology to separate the regeneration wastewater into a monovalent salt solution and a divalent salt solution. Through the nanofiltration component 210, the monovalent salt and the divalent salt in the regeneration wastewater can be preliminarily distinguished, solving the problem of difficult effective separation in traditional treatment methods. This separation not only improves the purity of the salts, but also provides conditions for subsequent treatment of different salts.

[0046] Next, the separated divalent salt solution flows into the room temperature crystallization reaction component 220. The room temperature crystallization reaction component 220 is specifically used to treat sulfate ions in the divalent salt solution. At this stage, by adding appropriate chemicals or changing the solution conditions, the sulfate ions are prompted to form crystals and precipitate from the solution. This process not only reduces the sulfate ion content in the solution, but also generates a recyclable solid product, realizing the initial reuse of resources.

[0047] Subsequently, the divalent salt solution treated by the room temperature crystallization reaction component 220 enters the sulfate-reducing bacteria reaction component. The sulfate-reducing bacteria reaction component further treats the sulfate ions in the divalent salt solution. Under the action of sulfate-reducing bacteria, the sulfate ions are reduced to sulfides, thereby significantly reducing the sulfate concentration in the solution. This biological treatment method is not only environmentally friendly, but also can more thoroughly remove residual sulfate ions, thereby improving the purity and quality of the final product. In addition, the sulfate-reducing bacteria reaction component can also produce by-products such as hydrogen sulfide, which can be further processed or utilized through subsequent processes.

[0048] Reference Figure 2 In some embodiments of the present invention, the nanofiltration assembly 210 includes a first nanofiltration component 211 , a second nanofiltration component 212 , a third nanofiltration component 213 and a pressure pump 214 .

[0049] The first nanofiltration component 211 has a first water inlet pipe, a first water production pipe and a first concentrated water pipe which are interconnected, and the first water inlet pipe is connected to the ion exchange water production and regeneration wastewater pretreatment device 100; the second nanofiltration component 212 has a second water inlet pipe, a second water production pipe and a second concentrated water pipe which are interconnected, and the second water inlet pipe is connected to the first water production pipe; The second nanofiltration component 212 is used to separate the monovalent salt solution, and the monovalent salt solution flows out through the second water production pipeline; the third nanofiltration component 213 has a third water inlet pipeline, a third water production pipeline and a third concentrated water pipeline that are interconnected, the first concentrated water pipeline and the second concentrated water pipeline are both connected to the third water inlet pipeline, and the third concentrated water pipeline is connected to the first water production pipeline; The third nanofiltration component 213 is used to separate the divalent salt solution, which flows out through the third water production pipeline, which is connected to the room temperature crystallization reaction component 220; the booster pump 214 is provided in the third water inlet pipeline to drive the circulation of the regenerated wastewater.

[0050] In this embodiment, the design of the nanofiltration component 210 is to ensure that different types of salts can be efficiently distinguished and treated by performing multi-stage nanofiltration separation on the regenerated wastewater. Specifically, when the pre-treated regenerated wastewater enters the first nanofiltration component 211, part of the monovalent salt solution and the divalent salt solution are initially separated by nanofiltration membrane technology. The separated solutions flow out from the first water production pipeline and the first concentrated water pipeline respectively, providing a basis for subsequent treatment.

[0051] Next, the second nanofiltration component 212 receives the fluid from the first water production pipeline and further separates a purer monovalent salt solution. The monovalent salt solution flows out through the second water production pipeline, achieving efficient separation of the monovalent salt solution. At the same time, the remaining concentrated water flows to the next processing unit through the second concentrated water pipeline.

[0052] Subsequently, the third nanofiltration component 213 is responsible for processing the mixed solution flowing in from the first concentrated water pipeline and the second concentrated water pipeline. In the third nanofiltration component 213, the divalent salt solution is further separated by nanofiltration membrane technology, and the divalent salt solution flows out through the third water production pipeline and is directly connected to the room temperature crystallization reaction component 220 for subsequent sulfate ion treatment.

[0053] In order to maintain the stable operation of the entire system, a booster pump 214 is provided in the third water inlet pipe to drive the circulation of the regenerated wastewater. The booster pump 214 not only ensures the continuity and pressure stability of the water flow, but also promotes the effective connection between the nanofiltration components, ensuring the smooth progress of each treatment step.

[0054] Overall, the design of the nanofiltration component 210 optimizes the treatment process of recycled wastewater, improves the effect of salt separation and resource utilization, and meets the requirements of modern environmental protection and resource recycling. The system not only solves the problems of impurity removal and salt separation in recycled wastewater treatment, but also achieves more thorough and efficient salt treatment through multi-stage nanofiltration separation technology. The nanofiltration component 210 has a high water recovery rate and a high chloride ion and sulfate ion interception rate. The high chloride ion and sulfate ion interception rates are 99.7% and -13.7%, respectively, and the average water recovery rate is 81.9%. The water recovery rate and operating pressure fluctuations in continuous operation are small, and the system operation stability is high.

[0055] Reference Figure 1In some embodiments of the present invention, the resource utilization device 300 includes a first reverse osmosis component 310, an ultrafiltration membrane component 320, a second reverse osmosis component 330 and a bipolar membrane electrodialysis component 340. The first reverse osmosis component 310 is connected to the second water production pipeline and is used to concentrate the monovalent salt solution to a first concentration greater than 65%. The ultrafiltration membrane component 320 is connected to the first reverse osmosis component 310 and is used to filter the monovalent salt solution; the second reverse osmosis component 330 is connected to the ultrafiltration membrane component 320 and is used to concentrate the monovalent salt solution to a second concentration greater than 60%; the bipolar membrane electrodialysis component 340 is connected to the second reverse osmosis component 330 and is used to process the monovalent salt solution of the second concentration and produce sodium hydroxide and hydrochloric acid.

[0056] In the above structure, the first reverse osmosis component 310 is connected to the second water production pipeline of the nanofiltration component 210 to receive the monovalent salt solution after nanofiltration separation. The first reverse osmosis component 310 concentrates the monovalent salt solution to a first concentration by reverse osmosis technology, and the first concentration is greater than 65%. This preliminary concentration process not only increases the salt concentration in the solution, but also provides a purer feed condition for subsequent processing steps.

[0057] Next, the preliminarily concentrated monovalent salt solution flows into the ultrafiltration membrane assembly 320. The ultrafiltration membrane assembly 320 is connected to the first reverse osmosis assembly 310 and is used to finely filter the monovalent salt solution. The ultrafiltration membrane can remove suspended particles and other impurities that may exist in the solution, ensuring that the efficiency will not be affected or the equipment will not be damaged due to the presence of impurities in the subsequent processing process.

[0058] Subsequently, the monovalent salt solution filtered by the ultrafiltration membrane assembly 320 enters the second reverse osmosis assembly 330. The second reverse osmosis assembly 330 continues to concentrate the solution to a second concentration greater than 60%. Through two reverse osmosis concentrations, the concentration of the monovalent salt solution is significantly increased, while ensuring a high degree of purification of the salts in the solution.

[0059] Finally, the concentrated monovalent salt solution enters the bipolar membrane electrodialysis module 340. The bipolar membrane electrodialysis module 340 is connected to the second reverse osmosis module 330 and is specifically used to treat the high-concentration monovalent salt solution and decompose it into sodium hydroxide and hydrochloric acid through electrochemical reaction. This treatment method not only realizes the recycling of resources, but also creates two valuable chemicals, improving the economic benefits of the entire system.

[0060] Reference Figure 1In some embodiments of the present invention, the salt separation device 200 also includes a water production pump, a heat exchanger, a safety filter and a nanofiltration circulation pump which are connected in sequence; the water supply pump is connected to the ultrafiltration water production tank 190, and the nanofiltration circulation pump is connected to the first water inlet pipe; the third water production pipe is connected to the divalent salt water tank, and the second water production pipe is connected to the monovalent salt water tank.

[0061] Before entering the nanofiltration component 210, the wastewater in the ultrafiltration water production tank 190 is pre-treated in sequence through a water production pump, a heat exchanger and a security filter. The water production pump provides the necessary pressure to ensure that the wastewater can flow smoothly through each treatment unit; the heat exchanger adjusts the temperature of the wastewater to provide suitable operating conditions for the subsequent nanofiltration process; the security filter removes tiny particles and other impurities in the wastewater to protect the nanofiltration membrane from contamination and damage. It should be noted that a reducing agent needs to be added to the regenerated wastewater before it enters the nanofiltration component 210. For the working principle of the regenerated wastewater in the nanofiltration component 210, the room temperature crystallization reaction component 220 and the sulfate-reducing bacteria reaction component, please refer to the above-mentioned related embodiments, which will not be repeated here.

[0062] Reference Figure 5 In some embodiments of the present invention, the first reverse osmosis assembly 310 is connected to the monovalent salt water tank, and the first reverse osmosis assembly 310 and the monovalent salt water tank are sequentially connected with a first water supply pump, a first filter, and a second water supply pump. Specifically, the first water supply pump may be a low-pressure water supply pump, the first filter may be a 5um security filter, and the second water supply pump may be a medium-pressure water supply pump.

[0063] Specifically, the first reverse osmosis component 310 can use Dow's anti-pollution high-efficiency membrane elements, and be equipped with an online flushing and chemical cleaning system. The high-pressure water supply pump of the online flushing and chemical cleaning system is equipped with a frequency conversion controller. Or the first reverse osmosis component 310 is equipped with a single chemical cleaning device, which is equipped with a cleaning water pump and a 5um security filter. The chemical cleaning system should be equipped with a thorough emptying and flushing device to prevent cross-contamination of the reagent. The operation of the first reverse osmosis component 310 is controlled by the water output and the conductivity meter signal, and the operation is automatically controlled. Conductivity meters, pH meters, residual chlorine meters, ORP meters, pressure meters, flow meters and other medium measuring instruments can be set on the water inlet pipe of the security filter, and each security filter outlet is equipped with an SDI membrane detection device. The security filter adopts a horizontal large-flow filtration system and a filter element with a folded surface design.

[0064] Reference Figure 5In some embodiments of the present invention, the first reverse osmosis assembly 310 and the ultrafiltration membrane assembly 320 are connected in sequence with a concentrated water tank and a third water supply pump, and a first circulation pipeline is provided between the ultrafiltration membrane assembly 320 and the concentrated water tank. The ultrafiltration membrane assembly 320 and the second reverse osmosis assembly 330 are connected in sequence with an ultrafiltration water production tank, a fourth water supply pump, a second filter, and a fifth water supply pump. The second reverse osmosis assembly 330 and the bipolar membrane electrodialysis assembly 340 are connected in sequence with a reverse osmosis water tank, a sixth water supply pump, and a circulating water supply pump, and a second circulation pipeline is provided between the circulating water supply pump and the bipolar membrane electrodialysis assembly 340.

[0065] Specifically, the bipolar membrane electrodialysis assembly 340 is formed by combining a bipolar membrane with a monopolar membrane. This technology uses a bipolar membrane to perform water dissociation, which is more economical than direct water electrolysis. The combination of a bipolar membrane and a monopolar membrane can not only achieve multiple functions, but is also widely used in multiple fields, especially in the treatment of typical chemical wastewater.

[0066] In the bipolar membrane electrodialysis assembly 340, water dissociation occurs in the middle layer of the bipolar membrane under the action of the electric field, generating H+ and OH- ions. This process allows the salt in the chemical wastewater to be separated and converted into the corresponding acid and base at the same time. Specifically, when the wastewater containing salts passes through the bipolar membrane, under the action of the electric field, the cations move toward the cathode and the anions move toward the anode. The presence of the bipolar membrane allows the water molecules to decompose into hydrogen ions (H+) and hydroxide ions (OH-) in the middle layer of the membrane, and these ions migrate in opposite directions, thereby achieving effective separation of salts.

[0067] Due to the unique mechanism of the bipolar membrane electrodialysis assembly 340, it can not only efficiently remove salt from wastewater, but also convert the salts contained in the wastewater into valuable acid and alkali products. For example, sodium chloride can be converted into hydrochloric acid and sodium hydroxide, both of which are widely used in industry. Therefore, this method not only solves the problem of wastewater treatment, but also realizes the recycling and reuse of resources, improving the economic benefits and environmental friendliness of the entire treatment process.

[0068] In the resource utilization device 300, the bipolar membrane electrodialysis component 340 is connected to the second reverse osmosis component 330 to receive the monovalent salt solution after two reverse osmosis concentrations. The component further processes the high-concentration monovalent salt solution and decomposes it into sodium hydroxide and hydrochloric acid through electrochemical reactions. In this way, the high-concentration salt solution that was originally difficult to process is not only effectively processed, but also converted into products with commercial value, further improving the overall benefits of the system.

[0069] The following points should be paid attention to when evaluating the quality of the influent of the bipolar membrane electrodialysis module 340, which also determines the necessity of the adequacy of wastewater pretreatment: 1. Based on the basic principle of bipolar membrane, bipolar membrane is only applicable to monovalent cation salt systems such as Li, Na, K, and ammonium; 2. Salt concentration requirements: 1.5N-2.5N is the best concentration (measured in concentration equivalent); 3. Total amount of divalent and higher cations: <1ppm (the lower the better, it depends on the technology); 4. The total amount of oil and surfactant is less than 2ppm (the lower the better). The type and content of organic solvents need to be consulted with the manufacturer.

[0070] 5. Silicon content <200ppm, TSS index <0.1ppm.

[0071] Water quality of bipolar membrane electrodialysis module 340: 1. If the influent is mixed salt, the effluent will be mixed acid or mixed alkali. For example, if the influent is mixed wastewater of sodium chloride and sodium sulfate, the alkali obtained is sodium hydroxide, and the acid is a mixed acid of sulfuric acid and hydrochloric acid. The ion ratio is similar to that of the influent.

[0072] 2. Acid concentration of effluent water: 0.5N-3N is adjustable, 1N-2N is the most economical, except for acids with strong oxidizing properties, the concentration is limited.

[0073] 3. Outlet alkali concentration: 0.5N-3N adjustable, 1N-2N is the most economical.

[0074] 4. Purity of acid and alkali in effluent water: Acids and alkalis contain a small amount of salt. According to feedback from manufacturers, there is generally about 0-1g / L of salt (related to the salt concentration of the inlet water, the acid and alkali concentration of the effluent water, etc.).

[0075] The structure and working principle of the ion exchange water regeneration wastewater pretreatment device 100 are provided below: Reference Figure 1 The present invention provides an ion exchange water regeneration wastewater pretreatment device, which includes a normal temperature crystallization reactor 120, a sedimentation tank 130, a filter assembly, an ion exchange assembly 170, and a strong oxidizer 180. The normal temperature crystallization reactor 120 is used to crystallize and separate some impurities in the regeneration wastewater; the sedimentation tank 130 is connected to the normal temperature crystallization reactor 120, and is used to precipitate and purify the regeneration wastewater after crystallization; the filter assembly is connected to the sedimentation tank 130, and is used to filter the regeneration wastewater after precipitation and purification; the ion exchange assembly 170 is connected to the filter assembly, and is used to remove calcium and magnesium ions in the regeneration wastewater; the strong oxidizer 180 is connected to the ion exchange assembly 170, and is used to kill microorganisms in the regeneration wastewater.

[0076] Specifically, the regenerated wastewater enters the normal temperature crystallization reactor 120, and by adding alkali solution, sodium carbonate, seed crystals and other reagents into the normal temperature crystallization reactor 120, the alkali solution ensures that the pH value of the entire reactor is greater than 11.5, and calcium carbonate, magnesium hydroxide, and metal hydroxide crystals are generated. The normal temperature crystallization reactor 120 consists of a water inlet circulation part, a chemical reaction center area, a slag particle discharge system and a precipitation clarification part. The special crystal growth mechanism design enables the crystals to grow rapidly and fully, and impurity ions such as calcium and magnesium react fully. There is no need to add flocculants (which will increase other impurities), and the crystals are self-screened and discharged from the body to complete the treatment. At this stage, more than 97% of calcium and magnesium ions, more than 99% of heavy metals, 100% of total silicon, and more than 75% of organic and inorganic reducing substances can be removed.

[0077] The regenerated wastewater treated by the normal temperature crystallization reactor 120 flows naturally to the sedimentation tank 130 by utilizing the height difference. In the sedimentation tank 130, the heavier crystal particles will settle to the bottom due to gravity, thereby achieving preliminary solid-liquid separation. The wastewater purified by sedimentation continues to flow to the filter assembly, where finer suspended matter is intercepted to further purify the water quality.

[0078] Next, the wastewater treated as above flows into the ion exchange assembly 170, which thoroughly removes heavy metal ions such as calcium and magnesium in the wastewater. This step is crucial for subsequent treatment because the presence of heavy metal ions such as calcium and magnesium may affect the quality of the final water or cause damage to subsequent equipment. Finally, the strong oxidizer 180 is connected after the ion exchange assembly 170. Its function is to inactivate microorganisms in the wastewater through strong oxidation to ensure the biological safety of the treated water.

[0079] The present invention promotes the crystallization of impurities through the normal temperature crystallization reactor 120, and can remove more than 97% of calcium and magnesium ions, more than 99% of heavy metals, 100% of total silicon, and more than 75% of organic and inorganic reducing substances; effective precipitation can be completed through the sedimentation tank 130, and the effect of fine filtration can be achieved through the filtering component. The calcium and magnesium ions can be completely removed through the ion exchange component 170, and microorganisms can be inactivated through the strong oxidizer 180. The entire process is closely connected, and each link is prepared for the next link. The collaborative work between the components not only solves the problem of excessive impurity ions in the regenerated wastewater, but also ensures the effectiveness and economy of the treatment process.

[0080] In some possible embodiments, the present invention further includes a wastewater regulating tank 110 and an ultrafiltration water production tank 190. The wastewater regulating tank 110 is arranged in the previous link of the normal temperature crystallization reactor 120, that is, the regenerated wastewater first passes through the wastewater regulating tank 110 before entering the normal temperature crystallization reactor 120. The wastewater regulating tank 110 has a certain water quantity and water quality balance adjustment function, is equipped with a high and low level gauge, and is equipped with an alkali solution dosing device, a pneumatic stirring device, and a temperature regulating cooling water facility. The cooling water equipment controls the inlet water temperature at a lower level, which is beneficial to the crystallization mechanism of the normal temperature crystallizer. The ultrafiltration water production tank 190 is arranged in the next link of the strong oxidizer 180, that is, the regenerated wastewater treated by the strong oxidizer 180 enters the ultrafiltration water production tank 190 for storage for the next link.

[0081] Reference Figure 6 and Figure 7 In some embodiments of the present invention, the sedimentation tank 130 includes a sedimentation shell 131, a sedimentation component 132, a cleaning component 133, an external water receiving tank 134 and a first water production pipe 135. The sedimentation shell 131 is provided with a chamber inside for sedimentation of the regenerated wastewater; the sedimentation component 132 has a sedimentation chamber inside and is arranged at the top of the chamber, and the sedimentation component 132 is used to precipitate impurities on the top of the regenerated wastewater; the cleaning component 133 is arranged in the sedimentation shell 131, and is used to clean the sediment at the bottom of the chamber; the external water receiving tank 134 is connected to the sedimentation chamber, and is used to guide the liquid after sedimentation in the sedimentation chamber; the first water production pipe 135 is connected to the external water receiving tank 134.

[0082] Specifically, the sedimentation shell 131 constitutes the basic framework of the sedimentation tank 130, and a cavity is provided inside the sedimentation shell, which provides necessary space for the regenerated wastewater to complete the sedimentation process. In order to improve the sedimentation efficiency, the sedimentation component 132 is arranged at the top of the cavity, and has a sedimentation cavity inside, which is specifically used to effectively precipitate the impurities on the top of the regenerated wastewater entering the sedimentation tank 130. When the wastewater flows into the sedimentation component 132, the lighter impurities will gradually settle in the sedimentation cavity, while the clearer water will continue to flow down to the cavity of the sedimentation shell 131.

[0083] In order to further improve the automation and maintenance convenience of the system, a cleaning component 133 is provided on the sedimentation housing 131, which can clean the sediment accumulated at the bottom of the chamber regularly or as needed. This design not only helps to maintain the long-term stable operation of the sedimentation tank 130, but also reduces the need for manual intervention and improves the overall operating efficiency.

[0084] In the above structure, the external water receiving tank 134 is connected to the sedimentation chamber of the sedimentation component 132, and its main function is to guide the liquid after preliminary sedimentation to flow out, ensuring smooth water flow while also preventing impurities that are not completely precipitated from being carried out. The first water production pipe 135 is connected to the external water receiving tank 134 and is responsible for guiding the purified water out of the sedimentation tank 130, thereby effectively improving the water quality.

[0085] The present invention effectively solves the problem that it is difficult to simultaneously and efficiently treat top impurities and bottom sediments in the regenerated wastewater through close cooperation between the components of the sedimentation tank 130. The design of the sedimentation tank 130 ensures that when the regenerated wastewater flows through this stage, the top suspended impurities can be fully removed and the bottom sediments can be cleaned in time, thereby providing better water inlet conditions for subsequent treatment steps.

[0086] Reference Figure 6 and Figure 7 In some embodiments of the present invention, the sedimentation shell 131 includes a shell body 1311, a first water inlet pipe 1312, a water distribution trough 1313, a toothed weir 1314 and a mud discharge pipe 1315. The shell body 1311 can be a rectangular parallelepiped structure, and its bottom is funnel-shaped, which is convenient for collecting sediments. The cavity is located inside the shell body 1311, and an opening is provided at the top of the shell body 1311; the toothed weir 1314 is provided at the left end of the opening; the water distribution trough 1313 is provided outside the toothed weir 1314, and the bottom end of the water distribution trough 1313 is lower than the top end of the toothed weir 1314; the first water inlet pipe 1312 is connected to the side of the water distribution trough 1313 away from the toothed weir 1314; the mud discharge pipe 1315 is used for discharging sediments, and is connected to the bottom end of the shell body 1311, and is located at the lowest part of the funnel structure, which is convenient for discharging sediments.

[0087] Specifically, the water distribution trough 1313 is arranged outside the toothed weir 1314, and its bottom end is lower than the top of the toothed weir 1314. This height difference enables the regenerated wastewater entering from the first water inlet pipe 1312 to be fully dispersed in the water distribution trough 1313, and the toothed weir 1314 can withstand the impact of the regenerated wastewater, eliminate the potential energy of the water inlet and evenly distribute the water. The regenerated wastewater then flows into the cavity through the toothed weir 1314 in a relatively gentle manner. Such an arrangement helps to reduce the impact of the water inlet on the inside of the cavity and ensure the stability of the sedimentation process. The first water inlet pipe 1312 is connected to the side of the water distribution trough 1313 away from the toothed weir 1314, ensuring that the regenerated wastewater entering the system first passes through the distribution of the water distribution trough 1313, thereby achieving uniform water inlet. The mud discharge pipe 1315 is arranged at the bottom of the shell body 1311, which is used to discharge the sediment deposited at the bottom of the cavity in time to prevent the sediment from accumulating and affecting the treatment efficiency.

[0088] In the above structure, this embodiment solves the problem that it is difficult to effectively precipitate suspended matter in regenerated wastewater. Through the cooperation of the water distribution trough 1313 and the toothed weir 1314, the uniform distribution of the regenerated wastewater is achieved, the turbulence phenomenon is reduced, and the rapid sedimentation of larger particles is promoted. At the same time, the existence of the mud discharge pipe 1315 ensures that the sediment will not be retained at the bottom of the cavity for a long time, maintaining the continuous and efficient operation of the system. In addition, the opening at the top of the shell body 1311 combined with the design of the toothed weir 1314 not only simplifies the structure, but also improves the convenience of operation and maintenance, ensuring the smooth progress of the entire sedimentation process.

[0089] Reference Figure 6 and Figure 7 In some embodiments of the present invention, the sedimentation component 132 includes a support plate 1321, a plurality of inclined tubes 1322, at least one internal water collecting tank 1323 and at least one bearing platform 1324. The support plate 1321 is fixedly mounted at one end of the opening away from the toothed weir 1314, that is, at the right end of the opening, and the top end of the support plate 1321 is flush with the top end of the opening. There is no specific restriction on the shape of the support plate 1321, as long as the support plate 1321 and the inner wall of the inclined tube 1322 form a cavity, which can be used as a sedimentation chamber; multiple inclined tubes 1322 are fixedly arranged at an angle at the bottom of the sedimentation chamber, and the angle between the inclined tube 1322 and the bottom end of the inclined tube 1322 can be 60 degrees, and the bottom end of the inclined tube 1322 is connected to the cavity inside the inclined tube 1322; the internal water collecting trough 1323 is arranged at the top of the inclined tube 1322, and the internal water collecting trough 1323 is connected to the external water receiving trough 134; the supporting platform 1324 is fixed or detachably arranged at the top of the support plate 1321, and its function is to install the cleaning component 133.

[0090] In the above structure, when the regenerated wastewater enters the internal cavity through the opening of the shell body 1311, it undergoes preliminary sedimentation, and the liquid at the top enters the sedimentation cavity through the inclined tube 1322. According to the principle of shallow sedimentation, the suspended matter is precipitated on the surface of the inclined tube 1322. When the sedimentation layer accumulates to a certain thickness, it will fall to the bottom of the internal cavity of the shell body 1311 according to its own gravity.

[0091] The inclined tube 1322 is fixedly arranged at the bottom of the sedimentation chamber, and the angle between the inclined tube 1322 and the bottom end of the inclined tube 1322 is 60 degrees. This design increases the effective sedimentation area, so that the suspended particles in the wastewater can settle to the bottom of the inclined tube 1322 more quickly, and then be discharged smoothly through the cavity inside the inclined tube 1322. This structure not only improves the sedimentation efficiency, but also reduces the possibility of the sediment being stirred again.

[0092] The internal water collecting tank 1323 is arranged at the top of the inclined tube 1322, and the internal water collecting tank 1323 is connected with the external water receiving tank 134. In this way, the relatively clear water after the sedimentation treatment can flow smoothly into the external water receiving tank 134, and further flow to the subsequent treatment unit or the discharge system. The supporting platform 1324 is fixed or detachably arranged at the top of the supporting plate 1321, which can ensure the stable installation of the cleaning component 133, and also provide the flexibility of maintenance and replacement, so that the operator can perform the cleaning work according to the needs.

[0093] Reference Figure 6 and Figure 7 In some embodiments of the present invention, the cleaning component 133 includes a motor 1331, a rotating rod 1332 and a scraper 1333. The motor 1331 is detachably mounted on the support platform 1324 by means of bolts or the like; the rotating rod 1332 is spline-connected to the output shaft of the motor 1331, and the bottom end of the rotating rod 1332 extends toward the bottom end of the cavity; the scraper 1333 is mounted at the bottom end of the rotating rod 1332 by welding or bolt connection, and is used to stir the sediment at the bottom end of the cavity so that the sediment is discharged through the mud discharge pipe 1315. It should be noted that the scraper 1333 is adapted to the shape of the bottom end of the shell body 1311, so that the scraper 1333 can ensure normal rotation while uniformly stirring the sediment at the bottom end of the shell body 1311, so that the sediment gathers toward the mud discharge pipe 1315.

[0094] The cleaning component 133 is designed to ensure effective cleaning of the sediment inside the sedimentation housing 131 to prevent it from accumulating at the bottom of the chamber, thereby affecting the processing efficiency and the long-term operating performance of the equipment. The motor 1331 is detachably mounted on the support platform 1324 by bolts or the like. This mounting method ensures the stability of the motor 1331 and facilitates maintenance and replacement.

[0095] The rotating rod 1332 and the output shaft of the motor 1331 are spline-connected to ensure the reliability of power transmission. The bottom end of the rotating rod 1332 extends to the bottom end of the cavity to transmit the power of the motor 1331 to the bottom of the cavity. The scraper 1333 is arranged at the bottom end of the rotating rod 1332 by welding or bolting, and is used to stir the sediment at the bottom end of the cavity. In order to ensure that the scraper 1333 can effectively perform the cleaning work, its shape is adapted to the shape of the bottom end of the shell body 1311, which not only enables the scraper 1333 to rotate normally, but also can evenly stir the sediment at the bottom end of the shell body 1311, so that the sediment gathers to the mud discharge pipe 1315 and is discharged smoothly.

[0096] In the above structure, the cooperation between the components of the cleaning part 133 solves the problem that the sediment is difficult to remove effectively. The motor 1331 provides power and transmits the rotational motion to the scraper 1333 through the rotating rod 1332, so that the scraper 1333 can stir the sediment according to the predetermined path. Since the design of the scraper 1333 matches the shape of the bottom end of the shell body 1311, it can cover the entire bottom area during the rotation process, ensuring that all sediment can be stirred and moved toward the mud discharge pipe 1315. This process avoids the long-term accumulation of sediment at the bottom of the cavity, reduces the need for manual cleaning, and improves the automation and operational stability of the system.

[0097] In addition, through such a design, the cleaning component 133 also ensures that the sedimentation tank 130 can continue to operate efficiently and maintain a good water quality treatment effect, while simplifying the maintenance procedures and enhancing the reliability and ease of operation of the system.

[0098] Reference Figure 8 In some embodiments of the present invention, the ion exchange assembly 170 includes an exchange shell 1711. Specifically, the exchange shell 1711 is a round tank-shaped structure, and the inner wall is provided with a rubber lining anti-corrosion layer. The top of the exchange shell 1711 is provided with a second water production pipe 177, the bottom is provided with a second water inlet pipe 174, and the top of the second water inlet pipe 174 located at one end inside the exchange shell 1711 is provided with a baffle 175.

[0099] The interior of the exchange housing 1711 is provided with a first filter plate 1712, a second filter plate 1713 and a third filter plate 1714 in order from top to bottom, and the first filter plate 1712, the second filter plate 1713 and the third filter plate 1714 divide the interior of the exchange housing 1711 into a first cavity 1721, a second cavity 1722, a third cavity 1723 and a fourth cavity 1724; the first filter plate 1712 is provided with a plurality of first single-sided filter caps 1731, the second filter plate 1713 is provided with a plurality of double-sided filter caps 1732, and the third filter plate 1714 is provided with a plurality of second single-sided filter caps 1733. It should be noted that the first single-sided filter cap 1731, the double-sided filter cap 1732 and the second single-sided filter cap 1733 are all set with dual flow rates, that is, when the flow rate is downward, the damping device provided will reduce the flow rate, while when the flow rate is upward, the flow rate is not affected.

[0100] The interior of the third cavity 1723 is provided with a weak acid cationic resin layer 1781 and a white ball resin compressed fat layer 1782 (the thickness of the white ball resin compressed fat layer 1782 can be about 200 mm) in sequence from bottom to top, and a gap is provided between the white ball resin compressed fat layer 1782 and the second filter plate 1713 (the thickness of the gap can be about 100 mm), and the gap is reserved for the expansion of the white ball resin compressed fat layer 1782; the interior of the second cavity 1722 is provided with a chelating resin layer 1783 and a white ball resin compressed fat layer 1782 (the thickness of the white ball resin compressed fat layer 1782 can be about 200 mm) in sequence, and a gap is provided between the white ball resin compressed fat layer 1782 and the first filter plate 1712 (the thickness of the gap can be about 100 mm), and the gap is reserved for the expansion of the white ball resin compressed fat layer 1782; at least one layer of porous plate 176 is provided inside the first filter plate 1712.

[0101] In this embodiment, first, the regenerated wastewater enters the bottom of the exchange shell 1711 through the second water inlet pipe 174 , and the potential energy of the incoming water is eliminated by the baffle 175 , so that the incoming water is evenly distributed on the third filter plate 1714 .

[0102] Subsequently, the wastewater flows upward and enters the third chamber 1723 through the second single-sided filter cap 1733, where the wastewater begins to contact the weak acid cation resin layer 1781. The weak acid cation resin layer 1781 is used to adsorb calcium and magnesium ions of equal alkalinity in the water to perform a preliminary ion exchange process. As the wastewater continues to rise, it passes through the white ball resin grease layer 1782, which is located above the weak acid cation resin layer 1781 and has a gap with the second filter plate 1713. The main function of the white ball resin grease layer 1782 is to maintain the stability and integrity of the weak acid cation resin layer 1781 and prevent the loss of resin particles.

[0103] The wastewater then flows into the second cavity 1722 through the double-sided filter cap 1732, and further passes through the chelating resin layer 1783. This layer further adsorbs and exchanges calcium and magnesium heavy metal ions. Similarly, after passing through the chelating resin layer 1783, the wastewater will again encounter the white ball resin grease layer 1782, which is also provided with a gap between the first filter plate 1712 to ensure smooth water flow and stable resin layer.

[0104] As the wastewater continues to move upward, it passes through the first single-sided filter cap 1731 and enters the first cavity 1721, where the water flow path is affected by the porous plate 176 provided inside the first filter plate 1712. The porous plate 176 eliminates the potential energy of the wastewater, making it more evenly distributed, and finally flows out from the second water production pipe 177, completing the entire treatment process.

[0105] Reference Fig. 9In some embodiments of the present invention, the strong oxidizer 180 includes a shell-and-tube reactor 181 , an oxidation water tank 182 and an oxygen release tank 183 . The tubular reactor 181 has an interconnected water inlet and a dosing port, the water inlet is connected to the water supply component 1821, and the dosing port is connected to the hydrogen peroxide dosing component 185 through the ejector 184; the oxidation water tank 182 has a water inlet, a water outlet and an overflow port, the water inlet is connected to the tubular reactor 181, the water outlet is connected to a circulating water pump 1824, the circulating water pump 1824 is connected to a pipeline ejector 1823, the negative pressure port of the pipeline ejector 1823 is connected to an ozone generator 1822, and the outlet of the pipeline ejector 1823 is connected to the water supply component 1821; the oxygen release box 183 is connected to the overflow port, and a nitrogen explosion component 1831 is provided inside, the first outlet of the oxygen release box 183 is connected to a lift pump 1832, and the second outlet of the oxygen release box 183 is connected to an exhaust gas absorber 1833.

[0106] The design of the strong oxidizer 180 aims to achieve effective inactivation of microorganisms and removal of harmful substances in the regenerated wastewater through a series of tightly connected components, thereby ensuring the biological safety of the treated water. The tubular reactor 181, as the front-end processing unit of the strong oxidizer 180, has an interconnected water inlet and a dosing port. The water inlet is connected to the water supply component 1821 for introducing the wastewater to be treated. The dosing port is connected to the hydrogen peroxide dosing component 185 through the ejector 184 to ensure that hydrogen peroxide can be evenly added to the wastewater flowing through the tubular reactor 181 to start the initial oxidation process. At the same time, redox potential measuring instruments are installed at different parts of the tubular reactor 181 to adjust the dosage of hydrogen peroxide and ozone according to the oxidation potential.

[0107] The wastewater flowing out of the tubular reactor 181 then enters the oxidation water tank 182, which has an inlet, an outlet and an overflow, wherein the inlet is directly connected to the tubular reactor 181. The wastewater continues to undergo oxidation reaction in the oxidation water tank 182 to further destroy the remaining organic matter and microorganisms. In order to enhance the oxidation effect, the outlet is connected to a circulating water pump 1824, which pumps part of the treated water back into the pipeline ejector 1823, where the ozone generated by the ozone generator 1822 is sucked in by negative pressure. The water after enhanced oxidation treatment returns to the tubular reactor 181 again, forming a closed-loop system, which ensures the sufficiency and continuity of the oxidation reaction.

[0108] The regenerated wastewater treated by the tubular reactor 181 enters the oxygen release box 183 through the overflow port. The oxygen release box 183 is provided with a nitrogen explosion component 1831. After the explosion, the gas mixed with the remaining ozone enters the tail gas absorber 1833, and the gas after the ozone is adsorbed is discharged into the atmosphere. The wastewater after the ozone is released is supplied to the next process by the lifting pump 1832.

[0109] Reference Fig.10 In some embodiments of the present invention, the shell-and-tube reactor 181 includes a plurality of direct current sections and a plurality of arc-shaped connecting pipes 1814, and the plurality of direct current sections are connected end to end through the arc-shaped connecting pipes 1814; the direct current section includes a water inlet pipe 1811 and a filler reaction tube 1812 connected in sequence, and the filler reaction tube 1812 is provided with at least one reagent injection pipe 1813, and the reagent injection pipe 1813 is connected to the filler reaction tube 1812.

[0110] Specifically, multiple direct current sections are connected end to end through an arc-shaped connecting pipe 1814 to form a flow channel, and the water inlet pipes 1811 at both ends are respectively connected to the water supply component 1821 and the water inlet of the oxidation water tank 182, while the reagent injection pipe 1813 is connected to the dosing port through the injector 184.

[0111] Reference Figure 1 In some embodiments of the present invention, the filter assembly includes a precision filter 140, a self-cleaning filter 150 and an ultrafiltration assembly 160 which are connected in sequence. The precision filter 140 is connected to the sedimentation tank 130, and the ultrafiltration assembly 160 is connected to the ion exchange assembly 170.

[0112] Specifically, the precision filter 140 can adopt a comet fiber filter, which has the characteristics of high dirt interception depth, strong dirt holding capacity, high filtering accuracy, more than 85% interception capacity of organic matter such as oil, thorough backwashing, and good recovery of filter material filtering capacity.

[0113] The self-cleaning filter 150 consists of a cylinder, a filter screen, a filter screen support structure, a filter cleaning device, a control system, a pressure difference switch, a drain valve, etc. It uses a 100um high-precision filter element. The filter control system can meet long-term continuous operation and can automatically clean the filter screen and clean it thoroughly.

[0114] The ultrafiltration component 160 can use a reverse osmosis protection device to intercept fine suspended matter, colloids and macromolecular organic matter in the water, so that its effluent SDI ≤ 3, meet the requirements of the reverse osmosis system for the SDI value and suspended matter, etc., extend the cleaning cycle of the reverse osmosis system, and thus extend its service life. Among them, the membrane element adopts the Japanese Asahi Chemical UNA-620A ultrafiltration membrane, and the absolute filtration accuracy can reach 0.1um. It is equipped with an online backwashing device and a chemical cleaning device, with a water production rate of 90%. The backwash water is equipped with an oxidant NaClO metering dosing device, and the dosing standard is 10-15 mg / L (in terms of effective chlorine).

[0115] The present invention also provides an ion exchange water production regeneration wastewater recovery method, which is implemented based on the ion exchange water production regeneration wastewater recovery system of any one of the above embodiments, and the ion exchange water production regeneration wastewater recovery method comprises: S1, removing impurities in the regeneration wastewater through the ion exchange water regeneration wastewater pretreatment device 100; S2, performing nanofiltration on the regenerated wastewater after impurities are removed by a salt separation device 200 to separate a monovalent salt solution and a divalent salt solution, and treating sulfate ions in the divalent salt solution; S3. The monovalent salt solution is processed into acid and alkali through the resource utilization device 300.

[0116] Wherein, step S1 comprises the following steps: S1.1, crystallizing and separating some impurities in the regeneration wastewater through a normal temperature crystallization reactor 120; S1.2, precipitating and purifying the crystallized regeneration wastewater in a sedimentation tank 130; S1.3, filtering the regenerated wastewater after precipitation purification through the filtering component; S1.4, removing calcium and magnesium ions from the regeneration wastewater through the ion exchange component 170; S1.5. Kill the microorganisms in the regenerated wastewater through the strong oxidizer 180.

[0117] Specifically, a wastewater supply pump is also provided between the wastewater regulating tank 110 and the normal temperature crystallization reactor 120. The wastewater supply pump is also connected to a sludge concentration component, which is used to concentrate the sludge removed from the water supply pump, and the concentrated liquid is re-supplied to the wastewater regulating tank 110, and the remaining sludge is transported to the sludge plant. Air and crystal seeds can be transported to the normal temperature crystallization reactor 120 during operation, and the crystal seeds can be NaOH and Na2CO3. An ultrafiltration water supply pump is provided between the sedimentation tank 130 and the filter component. A Na weak acid resin layer is also provided between the filter component and the ion exchange component 170. Regeneration acid is added in an appropriate amount to the ion exchange component 170 during operation. Air is added in an appropriate amount to the strong oxidizer 180 during operation. The strong oxidizer 180 is connected to the ultrafiltration water production tank 190, and the ultrafiltration water production tank 190 is also provided with a first reflux pipe and a second confluence pipe, the first reflux pipe is connected to the ultrafiltration component 160, and the reflux pipe is also provided with a backwash pump. The second manifold is connected to the precision filter 140, and a cleaning water pump is provided on the second manifold. The precision filter 140 needs to add HCL during the operation process. The ultrafiltration component 160 needs to add cleaning agent, HCL, NaOH and NaCLO during the operation process.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ion exchange water regeneration wastewater recovery system, characterized in that: include: An ion exchange water regeneration wastewater pretreatment device (100) is used to remove impurities in the regeneration wastewater; A salt separation device (200) is connected to the ion exchange water production regeneration wastewater pretreatment device (100), and is used to perform nanofiltration on the regeneration wastewater to separate a monovalent salt solution and a divalent salt solution, and to treat sulfate ions in the divalent salt solution; The resource utilization device (300) is connected to the salt separation device (200) and is used to prepare acid and alkali from the monovalent salt solution.

2. The ion exchange water production regeneration wastewater recovery system according to claim 1, characterized in that: The salt separation device (200) comprises: A nanofiltration component (210) is connected to the ion exchange water production regeneration wastewater pretreatment device (100) and is used to perform nanofiltration on the regeneration wastewater to separate a monovalent salt solution and a divalent salt solution; A room temperature crystallization reaction component (220) is connected to the nanofiltration component (210) and is used to process sulfate ions in the divalent salt solution; The SRB component (230) is connected to the room temperature crystallization reaction component (220) and is used to further process the sulfate ions in the divalent salt solution.

3. The ion exchange water production regeneration wastewater recovery system according to claim 2, characterized in that: The nanofiltration component (210) comprises: A first nanofiltration component (211) having a first water inlet pipe, a first water production pipe and a first concentrated water pipe which are interconnected, wherein the first water inlet pipe is connected to the ion exchange water production and regeneration wastewater pretreatment device (100); The second nanofiltration component (212) comprises a second water inlet pipeline, a second water production pipeline and a second concentrated water pipeline which are interconnected, wherein the second water inlet pipeline is connected to the first water production pipeline; the second nanofiltration component (212) is used to separate the monovalent salt solution, and the monovalent salt solution flows out through the second water production pipeline; The third nanofiltration component (213) comprises a third water inlet pipeline, a third water production pipeline and a third concentrated water pipeline which are interconnected, the first concentrated water pipeline and the second concentrated water pipeline are both connected to the third water inlet pipeline, and the third concentrated water pipeline is connected to the first water production pipeline; the third nanofiltration component (213) is used to separate the divalent salt solution, the divalent salt solution flows out through the third water production pipeline, and the third water production pipeline is connected to the room temperature crystallization reaction component (220); A pressure pump (214) is provided in the third water inlet pipe, and drives the regenerated wastewater to circulate.

4. The ion exchange water production regeneration wastewater recovery system according to claim 3, characterized in that: The resource utilization device (300) comprises: A first reverse osmosis component (310), connected to the second water production pipeline, and used for concentrating the monovalent salt solution to a first concentration; an ultrafiltration membrane assembly (320), which is in communication with the first reverse osmosis assembly (310) and is used to filter the monovalent salt solution; A second reverse osmosis component (330), which is in communication with the ultrafiltration membrane component (320) and is used to concentrate the monovalent salt solution to a second concentration; The bipolar membrane electrodialysis component (340) is connected to the second reverse osmosis component (330) and is used to process the monovalent salt solution of the second concentration and produce sodium hydroxide and hydrochloric acid.

5. The ion exchange water production regeneration wastewater recovery system according to claim 4, characterized in that: The salt separation device (200) further comprises a water production pump, a heat exchanger, a safety filter and a nanofiltration circulation pump which are sequentially connected and arranged; The water production pump is in communication with the ion exchange water production and regeneration wastewater pretreatment device (100), and the nanofiltration circulation pump is in communication with the first water inlet pipeline; The third water production pipeline is communicated with the divalent salt water tank, and the second water production pipeline is communicated with the monovalent salt water tank.

6. The ion exchange water production regeneration wastewater recovery system according to claim 5, characterized in that: The first reverse osmosis component (310) is in communication with the monovalent salt water tank, and a first water supply pump, a first filter and a second water supply pump are sequentially connected between the first reverse osmosis component (310) and the monovalent salt water tank.

7. The ion exchange water production regeneration wastewater recovery system according to claim 6, characterized in that: A concentrated water tank and a third water supply pump are sequentially connected between the first reverse osmosis assembly (310) and the ultrafiltration membrane assembly (320), and a first circulation pipeline is provided between the ultrafiltration membrane assembly (320) and the concentrated water tank.

8. The ion exchange water production regeneration wastewater recovery system according to claim 7, characterized in that: An ultrafiltration water production tank, a fourth water supply pump, a second filter and a fifth water supply pump are sequentially connected between the ultrafiltration membrane assembly (320) and the second reverse osmosis assembly (330).

9. The ion exchange water production regeneration wastewater recovery system according to any one of claims 6 to 8, characterized in that: A reverse osmosis water tank, a sixth water supply pump and a circulating water supply pump are sequentially connected between the second reverse osmosis component (330) and the bipolar membrane electrodialysis component (340), and a second circulating pipeline is also provided between the circulating water supply pump and the bipolar membrane electrodialysis component (340).

10. A method for recycling ion exchange water regeneration wastewater, characterized in that: Based on the implementation of the ion exchange water production regeneration wastewater recovery system according to any one of claims 1 to 9, the ion exchange water production regeneration wastewater recovery method comprises: Removing impurities in the regeneration wastewater by using the ion exchange water regeneration wastewater pretreatment device (100); The salt separation device (200) performs nanofiltration on the regenerated wastewater after impurities are removed to separate a monovalent salt solution and a divalent salt solution, and treats sulfate ions in the divalent salt solution; The monovalent salt solution is processed by the resource utilization device (300) to produce acid and alkali.

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