A method and device for resource utilization of high-hardness salt-containing organic wastewater

Abstract

The present invention discloses a method and device for resource utilization of high-hardness saline organic wastewater, which relates to the technical field of wastewater resource utilization, including: based on the pretreated high-hardness saline organic wastewater, selective ion separation is performed through a new high-efficiency selective ion exchange membrane and electrodialysis to obtain de-hardened light brine; based on the de-hardened light brine, enhanced induced crystallization is performed through a fluidized bed reactor to obtain a crystallized mixed solution; solid-liquid separation is performed on the crystallized mixed solution, and organic matter is removed through an advanced oxidation treatment method to obtain advanced oxidation pretreated water; based on the advanced oxidation pretreated water, desalinated fresh water and concentrated brine are obtained through a reverse osmosis membrane method; and concentrated brine is converted into chemical products through a bipolar membrane electrodialysis method. The present invention improves the recovery rate of water resources and salt resources through new high-efficiency selective ion exchange membrane electrodialysis, enhanced induced crystallization, advanced oxidation treatment and bipolar membrane electrodialysis.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater resource utilization, in particular to a method and device for resource utilization of high-hardness salt-containing organic wastewater. Background Art

[0002] High-hardness saline organic wastewater mainly comes from the chemical, petroleum, metallurgy, food processing and other industries, and has the characteristics of high hardness, high salinity and high organic content. Although traditional wastewater treatment technologies such as chemical precipitation, ion exchange and reverse osmosis can partially solve some wastewater treatment problems, due to the complex nature of high hardness and high salinity, these methods have great limitations in treatment effect, energy efficiency and cost. For example, chemical precipitation is often plagued by scaling problems, resulting in reduced treatment efficiency; and traditional ion exchange methods, when faced with high salt concentrations, often lead to frequent replacement due to the rapid failure of the resin, which increases the treatment cost and operation difficulty. With the continuous development of technology, electrodialysis technology has been applied to the treatment of some high-hardness saline wastewater due to its low energy consumption and high selective separation ability, but it still faces problems such as unstable treatment efficiency and low ion migration efficiency.

[0003] In the existing technology, although various advanced wastewater treatment methods have been adopted, these methods still fail to fully meet the needs of resource utilization of high-hardness saline organic wastewater. First, although the existing electrodialysis and ion exchange membrane technologies can separate some salts, the treatment effect is still insufficient in the treatment process of high-concentration brine. Secondly, traditional physical and chemical methods are often difficult to solve the organic pollution problems in high-hardness and high-salt wastewater at the same time, so a comprehensive solution is needed that can perform multiple treatments, improve resource recovery rates and reduce pollution. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a method for resource utilization of high-hardness saline organic wastewater to solve the problems of poor treatment effect of high-concentration brine and difficulty in removing organic pollution in high-hardness saline wastewater in the prior art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a method for resource utilization of high-hardness saline organic wastewater, which comprises the following steps: collecting high-hardness saline organic wastewater and pretreating the high-hardness saline organic wastewater; based on the pretreated high-hardness saline organic wastewater, selective ion separation is performed through a new type of high-efficiency selective ion exchange membrane and an electrodialysis method to obtain de-hardened brine; based on the de-hardened brine, enhanced induced crystallization is performed through a fluidized bed reactor to obtain a crystallization mixture; solid-liquid separation is performed on the crystallization mixture, and organic matter is removed through an advanced oxidation treatment method to obtain advanced oxidation pretreated water; based on the advanced oxidation pretreated water, treatment is performed through a reverse osmosis membrane method to obtain desalinated fresh water and concentrated brine; and the concentrated brine is converted into chemical products through a bipolar membrane electrodialysis method.

[0008] As a preferred solution of the method for resource utilization of high-hardness saline organic wastewater of the present invention, wherein: the high-hardness saline organic wastewater is collected and pretreated, and the specific steps are as follows:

[0009] Collect high-hardness, salty, organic wastewater from production processes and industrial discharges through wastewater collection pools;

[0010] The pretreatment of high-hardness salt-containing organic wastewater includes preliminary filtration, removal of large particle matter, removal of heavy metal ions and removal of suspended solids.

[0011] As a preferred scheme of the method for resource utilization of high-hardness saline organic wastewater of the present invention, wherein: the high-hardness saline organic wastewater after pretreatment is subjected to selective ion separation by a new type of high-efficiency selective ion exchange membrane and electrodialysis to obtain de-hardened light salt water, the specific steps are as follows:

[0012] Based on the pretreated high-hardness saline organic wastewater, the hardness ions in the pretreated high-hardness saline organic wastewater are electrodialyzed by combining alternating current with direct current and using a new type of high-efficiency selective ion exchange membrane;

[0013] In the electrodialysis process, by adjusting the current density, voltage and controlling the electrodialysis time, the hardness ions in the pretreated high-hardness saline organic wastewater are fully exchanged and migrated with the new high-efficiency selective ion exchange membrane;

[0014] During the electrodialysis process, the conductivity and hardness ion concentration changes in the pretreated high-hardness saline organic wastewater were monitored in real time, and the hardness ion removal efficiency was calculated. The expression is:

[0015]

[0016] Where, F(t) is the hardness ion removal efficiency value at time point t, C n(t) is the hardness ion concentration in the pretreated high-hardness saline organic wastewater input at time point t, C o (t) is the hardness ion concentration in the pretreated high-hardness saline organic wastewater output at time point t, V(t) is the flow rate of the pretreated high-hardness saline organic wastewater at time point t, I(t) is the current intensity at time point t, V max is the maximum flow rate of the pretreated high-hardness saline organic wastewater at time point t, I max is the maximum current intensity at time t, where t is the index variable at the time point;

[0017] By analyzing the historical hardness ion removal efficiency values, the hardness ion removal effect threshold Б is set;

[0018] Based on the hardness ion removal efficiency value and the hardness ion removal effect threshold, the hardness ion removal effect is evaluated;

[0019] When F(t)≥Б, it indicates that the hardness ion removal effect is better;

[0020] When F(t)<Б, it means that the hardness ion removal effect is poor, and the flow rate and current intensity need to be adjusted until F(t)≥Б;

[0021] Based on the evaluation results, de-hardened brine with removal effect reaching the standard is obtained.

[0022] As a preferred scheme of the method for resource utilization of high-hardness saline organic wastewater of the present invention, wherein: the de-hardened brine is subjected to enhanced induced crystallization through a fluidized bed reactor to obtain a crystallization mixture, and the specific steps are as follows:

[0023] Using porous ceramic particles as a crystallization reaction medium in a fluidized bed reactor;

[0024] The de-hardened salt water is introduced into a fluidized bed reactor to undergo a crystallization reaction with the porous ceramic particles;

[0025] Adjust the pH value in the crystallization reaction by adjusting the solution with acid or alkali;

[0026] The temperature and flow rate in the crystallization reaction are regulated by a heater and a temperature sensor in combination with a flow controller;

[0027] Control the gas flow rate by adjusting the gas supply pressure;

[0028] Based on the adjusted pH value, temperature and flow rate, the reaction parameters in the crystallization reaction are monitored in real time by an online monitoring instrument, and the reaction parameters are adjusted according to the monitoring data;

[0029] During the crystallization reaction with the reaction parameters adjusted, a crystallization mixed liquid containing solid crystal particles is gradually formed in the fluidized bed reactor.

[0030] As a preferred scheme of the method for resource utilization of high-hardness salt-containing organic wastewater of the present invention, wherein: the crystallization mixed liquid is subjected to solid-liquid separation, and organic matter is removed by an advanced oxidation treatment method to obtain advanced oxidation pretreated water, the specific steps are as follows:

[0031] The crystallization mixture is introduced into a high-efficiency centrifuge, and the solid crystal particles are separated from the liquid by centrifugal force under high-speed rotation. The solid particles with large particle size are separated to obtain a wet cake-like solid product and a supernatant after centrifugation;

[0032] The supernatant after centrifugation is passed through an ultrafiltration membrane to remove tiny suspended particles and colloidal substances;

[0033] Based on the supernatant after ultrafiltration membrane treatment, organic matter is removed by advanced oxidation treatment method, and the expression is:

[0034]

[0035] Where Y(t) is the organic matter concentration in the supernatant after advanced oxidation treatment at time point t, Y(0) is the initial organic matter concentration in the supernatant, k is the reaction rate constant, Q(t) is the ozone concentration at time point t, E is the activation energy, R is the ideal gas constant, T is the absolute temperature, P(t) is the gas pressure at time point, P max is the maximum allowable gas pressure, n is the gas pressure influence index, f(t) is the dynamic adjustment factor at time point t, and t is the index variable at time point;

[0036] Define the organic matter concentration threshold according to the historical organic matter concentration in the supernatant after advanced oxidation treatment

[0037] Based on the organic matter concentration in the supernatant after the advanced oxidation treatment and the organic matter concentration threshold, assess whether the organic matter concentration in the supernatant meets the standard;

[0038] when When , it means that the organic matter concentration in the supernatant after advanced oxidation treatment reaches the standard;

[0039] when When the concentration of organic matter in the supernatant after the advanced oxidation treatment does not reach the standard, the reaction conditions need to be adjusted to continue the advanced oxidation treatment until

[0040] Based on the evaluation results, advanced oxidation pre-treated water is obtained.

[0041] As a preferred scheme of the method for resource utilization of high-hardness salt-containing organic wastewater of the present invention, wherein: the water pretreated based on advanced oxidation is treated by a reverse osmosis membrane method to obtain desalinated fresh water and concentrated brine, and the specific steps are as follows:

[0042] Remove the residual solid suspended particles and impurities in the advanced oxidation pre-treated water through precision filtration;

[0043] Soften the advanced oxidation pre-treated water after precision filtration;

[0044] Based on the softened advanced oxidation pre-treated water, it is pressurized by a high-pressure pump and input into multiple reverse osmosis membranes, and the water molecules are separated by the selective pores of the reverse osmosis membrane to form desalinated fresh water;

[0045] Conduct water quality assessment on desalinated water and, based on the assessment results, use desalinated water for industrial circulating water, agricultural irrigation, and other scenarios that require low-salinity water;

[0046] Most of the dissolved salts, heavy metal ions and other tiny particles are retained to form concentrated brine.

[0047] As a preferred solution of the method for resource utilization of high-hardness salt-containing organic wastewater of the present invention, wherein: the concentrated brine is converted into chemical products by bipolar membrane electrodialysis method, and the specific steps are as follows:

[0048] The concentrated brine is introduced into the bipolar membrane electrodialysis cell, and the target ions in the concentrated brine are driven to migrate to the corresponding electrodes through the electrodialysis membrane by the electric field. At the same time, the target ions in the concentrated brine are separated from the impurities through the bipolar membrane, and the target ions in the concentrated brine are accumulated in the bipolar membrane area. The concentration of the target ions in the concentrated brine is calculated, and the expression is:

[0049]

[0050] Where N(t) is the target ion concentration in the concentrated brine at time point t, G0 is the target ion concentration in the concentrated brine at the initial moment, j is the electrodialysis coefficient, I(t) is the current intensity at time point t, d is the length of the active area of ​​the bipolar membrane, η is the electroosmotic efficiency of the bipolar membrane, Ф is the Faraday constant, and t is the index variable at the time point;

[0051] After being treated by bipolar membrane electrodialysis, the target ions in the concentrated brine accumulated in the bipolar membrane area are extracted from the electrodialysis cell to finally obtain chemical products.

[0052] In a second aspect, the present invention provides a high-hardness saline organic wastewater resource utilization device, including a wastewater collection and pretreatment module, an electrodialysis treatment module, an enhanced crystallization module, a separation and oxidation module, a reverse osmosis treatment module and a chemical product conversion module; the wastewater collection and pretreatment module is used to collect high-hardness saline organic wastewater and pretreat the high-hardness saline organic wastewater; the electrodialysis treatment module is used to obtain desalinated brine based on the pretreated high-hardness saline organic wastewater through a new high-efficiency selective ion exchange membrane and an electrodialysis method; the enhanced crystallization module is used to obtain a crystallized mixed solution by performing enhanced induced crystallization through a fluidized bed reactor based on the dehardened brine; the separation and oxidation module is used to perform solid-liquid separation on the crystallized mixed solution and remove organic matter through an advanced oxidation treatment method to obtain advanced oxidation pretreated water; the reverse osmosis treatment module is used to obtain desalinated fresh water and concentrated brine by a reverse osmosis membrane method based on the advanced oxidation pretreated water; the chemical product conversion module is used to convert the concentrated brine into chemical products through a bipolar membrane electrodialysis method.

[0053] In a third aspect, the present invention provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: when the computer program is executed by the processor, any step of the method for resource utilization of high-hardness salt-containing organic wastewater as described in the first aspect of the present invention is implemented.

[0054] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, any step of the method for resource utilization of high-hardness saline organic wastewater as described in the first aspect of the present invention is implemented.

[0055] The beneficial effects of the present invention are as follows: through a systematic high-hardness saline organic wastewater treatment process, combined with key technologies such as new high-efficiency selective ion exchange membrane electrodialysis, enhanced induced crystallization, advanced oxidation treatment and bipolar membrane electrodialysis, not only hardness ions and organic pollutants can be efficiently removed, but also the resource utilization of wastewater can be realized, desalinated fresh water and valuable chemical products can be generated, environmental pollution can be significantly reduced, and the recovery rate of water resources and salt resources can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0057] Figure 1 This is a flow chart of the method for resource utilization of high-hardness salt-containing organic wastewater in Example 1.

[0058] Figure 2 This is a schematic diagram of the resource utilization device for high-hardness salt-containing organic wastewater in Example 1. DETAILED DESCRIPTION

[0059] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0060] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0061] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0062] Example 1, reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, provides a method for resource utilization of high-hardness salt-containing organic wastewater, comprising the following steps:

[0063] S1. Collect high-hardness saline organic wastewater and pre-treat the high-hardness saline organic wastewater.

[0064] S1.1. Collect high-hardness, salty organic wastewater from production processes and industrial emissions through wastewater collection pools.

[0065] S1.2 Pretreatment of high-hardness saline organic wastewater includes preliminary filtration, removal of large particles, removal of heavy metal ions, and removal of suspended solids.

[0066] It should be noted that the high-hardness saline organic wastewater is pretreated by preliminary filtration, removal of large particles, removal of heavy metal ions and removal of suspended solids, as follows:

[0067] Primary filtration: High-hardness, salty organic wastewater passes through one or more multi-stage precision filters, which usually contain filter screens or filter elements with different pore sizes (such as 100 microns, 50 microns and 10 microns) to gradually remove larger suspended particles and impurities;

[0068] Removal of large particles: Physical methods such as centrifugal sedimentation or cyclone separation are used for treatment. High-hardness salt-containing organic wastewater flows into the centrifuge or cyclone separator. Under the centrifugal force generated by high-speed rotation, the solid particles with higher density are thrown to the outer wall and discharged from the system through the bottom slag discharge port;

[0069] Removal of heavy metal ions: First, add an appropriate amount of chemical precipitant (such as sodium hydroxide, sodium sulfide, etc.) to the high-hardness saline organic wastewater to form insoluble precipitates from the heavy metal ions. Subsequently, flocculants are used to promote the coagulation and sedimentation of the precipitates to ensure the effective removal of heavy metal ions. In addition, high-efficiency adsorbents such as activated carbon, ion exchange resins or nanomaterials can be used to further adsorb the residual heavy metal ions to ensure that the effluent meets strict emission standards;

[0070] Removal of suspended solids: First, add coagulants (such as polyaluminium chloride, polyacrylamide, etc.) to the high-hardness saline organic wastewater to make the tiny suspended particles aggregate to form larger flocs, which are convenient for subsequent sedimentation and separation. The high-hardness saline organic wastewater then flows into the sedimentation tank. Under static conditions, the heavier flocs gradually sink to the bottom of the tank and are discharged through the sludge pump. For light suspended matter that is difficult to settle, flotation separation technology is used. Tiny bubbles are introduced into the high-hardness saline organic wastewater to make the suspended matter adhere to the surface of the bubbles and float to the water surface, where they are collected and removed by a scraper.

[0071] S2. Based on the pretreated high-hardness saline organic wastewater, a new type of high-efficiency selective ion exchange membrane and electrodialysis are used for selective ion separation to obtain de-hardened brine.

[0072] S2.1. Based on the pretreated high-hardness saline organic wastewater, the hardness ions in the pretreated high-hardness saline organic wastewater are electrodialyzed by combining alternating current with direct current and using a new type of high-efficiency selective ion exchange membrane.

[0073] It should be noted that the specific electrodialysis process is that the pretreated high-hardness saline organic wastewater flows through a membrane stack composed of a cation exchange membrane, anion exchange membrane and a bipolar membrane under the action of an electric field. The application of alternating current helps to reduce the polarization of the membrane stack, improve the hardness ion migration efficiency, and effectively prevent membrane scaling. At the same time, direct current provides a continuous driving force to ensure that hardness ions (such as calcium and magnesium ions) can effectively migrate from the desalination chamber to the concentration chamber, while water molecules and other non-target components are retained in the desalination chamber.

[0074] S2.2. During the electrodialysis process, the hardness ions in the pretreated high-hardness saline organic wastewater are fully exchanged and migrated with the new high-efficiency selective ion exchange membrane by adjusting the current density, voltage and controlling the electrodialysis time.

[0075] Specifically, the current density controller is used to set the appropriate current density (usually 10-30A / m 2 ) and dynamically adjust the voltage (2-4V) according to the influent water quality to maintain a stable electric field strength and promote the effective migration of hardness ions. At the same time, the electrodialysis time is strictly controlled to ensure sufficient treatment cycles so that the hardness ions can pass through the cation exchange membrane and the anion exchange membrane driven by the electric field and migrate to the concentration chamber and the desalination chamber respectively, thereby minimizing the concentration of hardness ions in the desalination chamber.

[0076] S2.3. Real-time monitoring of the conductivity and hardness ion concentration changes in the pretreated high-hardness saline organic wastewater during electrodialysis, and calculation of the hardness ion removal efficiency value, the expression is:

[0077]

[0078] Where, F(t) is the hardness ion removal efficiency value at time point t, C n (t) is the hardness ion concentration in the pretreated high-hardness saline organic wastewater input at time point t, C o (t) is the hardness ion concentration in the pretreated high-hardness saline organic wastewater output at time point t, V(t) is the flow rate of the pretreated high-hardness saline organic wastewater at time point t, I(t) is the current intensity at time point t, V max is the maximum flow rate of the pretreated high-hardness saline organic wastewater at time point t, I max is the maximum current intensity at time point t, and t is the index variable of the time point.

[0079] It should be noted that the hardness ion concentration in the pre-treated high-hardness saline organic wastewater is detected by online monitoring instruments or laboratory analysis equipment (such as ion chromatographs, atomic absorption spectrometers, etc.) on the pre-treated high-hardness saline organic wastewater samples entering the electrodialysis system. These instruments can accurately measure the concentration of hardness ions such as calcium and magnesium in the water sample and record it as the initial input concentration;

[0080] The hardness ion concentration in the output pretreated high-hardness saline organic wastewater is determined by periodically taking out a small amount of treated water samples from the desalination chamber during the electrodialysis process and using the same detection method as the input concentration (such as ion chromatograph, atomic absorption spectrometer, etc.) to determine the hardness ion concentration therein as the output concentration;

[0081] The flow rate of the pretreated high-hardness salt-containing organic wastewater entering the electrodialysis is monitored in real time by a flow meter (such as an electromagnetic flow meter, a turbine flow meter, etc.) installed on the water inlet pipeline;

[0082] Current intensity, using an ammeter or current sensor to monitor the current intensity at each time point in real time;

[0083] The maximum flow rate of the high-hardness saline organic wastewater after pretreatment is the maximum instantaneous flow rate value observed during the entire treatment cycle. This parameter can be determined through the historical records of the flow meter, that is, finding the maximum value of all recorded flow rate data;

[0084] The maximum current intensity refers to the maximum instantaneous current value observed during the entire processing cycle. This parameter can be determined through the historical records of the ammeter or current sensor, that is, finding the maximum value of all recorded current intensity data.

[0085] S2.4. By analyzing the historical hardness ion removal efficiency values, set the hardness ion removal effect threshold Б.

[0086] Furthermore, the operating parameter data recorded during the past multiple batches of electrodialysis treatments are collected and organized, including current density, voltage and flow rate; then, the minimum, maximum and average removal efficiency values ​​in these operating parameter data are counted, and the minimum removal efficiency that can stably meet the standards under different operating conditions is identified; based on this, a threshold value for the hardness ion removal effect is set.

[0087] S2.5. Evaluate the hardness ion removal effect based on the hardness ion removal efficiency value and the hardness ion removal effect threshold;

[0088] When F(t)≥Б, it indicates that the hardness ion removal effect is better;

[0089] When F(t)<Б, it means that the hardness ion removal effect is poor, and the flow rate and current intensity need to be adjusted until F(t)≥Б.

[0090] S2.6. Based on the evaluation results, obtain de-hardened salt water with removal effect that meets the standard.

[0091] S3. Based on the de-hardened brine, enhanced induced crystallization is carried out through a fluidized bed reactor to obtain a crystallized mixed solution.

[0092] S3.1. Use porous ceramic particles as the crystallization reaction medium in a fluidized bed reactor.

[0093] S3.2, introducing the de-hardened brine into a fluidized bed reactor to undergo a crystallization reaction with the porous ceramic particles.

[0094] S3.3. Adjust the pH value in the crystallization reaction by adjusting the solution with acid or alkali.

[0095] Specifically, during the crystallization reaction, an online pH sensor is used to monitor the pH value in the fluidized bed reactor in real time, and an appropriate amount of acid or alkali solution is automatically added according to the preset target pH value. The dosage of acid and alkali is accurately controlled by a precision metering pump to ensure that the pH value of the reaction solution is stable within the optimal range.

[0096] It should be noted that the target pH value is the optimal pH value determined through experimental research and historical data accumulation based on the chemical conditions required for the crystallization reaction and the expected crystal formation effect;

[0097] The optimal range refers to the pH interval that can ensure the efficient crystallization reaction and obtain the ideal crystal morphology and size. It is usually determined through experimental optimization and literature reference based on the properties of the specific reactants and the crystallization kinetics. For example, for some reactions it may be between 6.5 and 7.5.

[0098] S3.4. The temperature and flow rate in the crystallization reaction are adjusted by means of a heater and a temperature sensor in combination with a flow controller.

[0099] Specifically, during the crystallization reaction, the temperature in the reactor is monitored and precisely controlled in real time using a heater and a built-in temperature sensor to ensure that it is maintained within the optimal reaction temperature range; at the same time, the feed flow rate is adjusted through a flow controller to ensure uniform distribution of reactants and stable reaction conditions;

[0100] It should be noted that the optimal reaction temperature range is determined based on the chemical characteristics and experimental optimization of the specific crystallization reaction, usually obtained through laboratory testing and historical data accumulation. For example, for some crystallization reactions, it may be between 30°C and 45°C. This range ensures the optimal solubility and crystallization rate of the reactants, thereby obtaining the ideal crystal morphology and size.

[0101] S3.5. Control the gas flow rate by adjusting the gas supply pressure.

[0102] Specifically, during the crystallization reaction, the gas flow rate entering the fluidized bed reactor is precisely controlled by adjusting the pressure of the gas supply system. Properly increasing the gas flow rate can improve the fluidization state in the reactor, promote crystal nucleation and growth, and significantly enhance the crystallization effect.

[0103] S3.6. Based on the adjusted pH value, temperature and flow rate, the reaction parameters in the crystallization reaction are monitored in real time by online monitoring instruments, and the reaction parameters are adjusted according to the monitoring data.

[0104] Specifically, during the crystallization reaction, online monitoring instruments are used to collect and analyze parameters such as pH value, temperature, flow rate, etc. in real time. These data are transmitted to the automatic control system. According to the preset optimal conditions and real-time monitoring results, the amount of acid and alkali added, the heater power, and the flow controller settings are dynamically adjusted to ensure that the reaction is always carried out in the best state;

[0105] It should be noted that the optimal state refers to ensuring that the reaction conditions are always maintained within the optimal range that can maximize crystallization efficiency, promote the formation of ideal crystal morphology, and ensure product quality and yield through precise control and optimization of parameters such as pH value, temperature, and flow rate.

[0106] S3.7. During the crystallization reaction with the reaction parameters adjusted, a crystallization mixed liquid containing solid crystal particles is gradually formed in the fluidized bed reactor.

[0107] S4. Perform solid-liquid separation on the crystallized mixed liquid, and remove organic matter through an advanced oxidation treatment method to obtain advanced oxidation pretreated water.

[0108] S4.1. Introduce the crystallization mixture into a high-efficiency centrifuge, and use centrifugal force to separate the solid crystal particles from the liquid under high-speed rotation. The solid particles with large particle size are separated to obtain a wet cake-like solid product and a supernatant after centrifugation.

[0109] Specifically, the crystallization mixture is introduced into a high-efficiency centrifuge, and the strong centrifugal force is used to quickly separate the solid crystal particles from the liquid under high-speed rotation. The large-sized solid particles are quickly thrown to the outer wall of the centrifuge due to their heavier weight, forming a wet cake-like solid product, while the lighter liquid is discharged through the outlet inside the centrifuge to obtain a clear supernatant after centrifugation.

[0110] It should be noted that the wet cake solid product is further dehydrated by a filter press, and then the wet cake solid after filtration is sent to a drying device for thorough dehydration to finally obtain a dry solid product. These dried solid products can be directly applied to the field of building materials due to their good physical properties and stability, such as being used as fillers or additives in the production of concrete, bricks or other building components, thereby achieving efficient recycling and reuse of resources.

[0111] S4.2. The supernatant after centrifugation is passed through an ultrafiltration membrane to remove tiny suspended particles and colloidal substances.

[0112] It should be noted that the selective retention function of the ultrafiltration membrane is used to effectively remove tiny suspended particles and colloidal substances. The supernatant flows through the ultrafiltration membrane under a certain pressure, and water and small molecular solutes are purified through the membrane, while larger particles and colloids are retained, ensuring that the treated liquid is clear and stable.

[0113] S4.3, based on the supernatant after ultrafiltration membrane treatment, the organic matter is removed by advanced oxidation treatment method, the expression is:

[0114]

[0115] Where Y(t) is the organic matter concentration in the supernatant after advanced oxidation treatment at time point t, Y(0) is the initial organic matter concentration in the supernatant, k is the reaction rate constant, Q(t) is the ozone concentration at time point t, E is the activation energy, R is the ideal gas constant, T is the absolute temperature, P(t) is the gas pressure at time point, P max is the maximum allowable gas pressure, n is the gas pressure influence index, f(t) is the dynamic adjustment factor at time point t, and t is the index variable at time point.

[0116] S4.4. Define the threshold concentration of organic matter that meets the standards based on the concentration of organic matter in the supernatant after historical advanced oxidation treatment

[0117] It should be noted that the organic matter concentration data of the supernatant after multiple batches of treatment are collected and their distribution is statistically analyzed to identify the minimum organic matter concentration that can ensure that the water quality meets the standards. This concentration is set as the threshold for meeting the organic matter standards in combination with relevant environmental protection standards and application requirements.

[0118] S4.5. Based on the organic matter concentration in the supernatant after the advanced oxidation treatment and the organic matter concentration threshold, assess whether the organic matter concentration in the supernatant meets the standard;

[0119] when When , it means that the organic matter concentration in the supernatant after advanced oxidation treatment reaches the standard;

[0120] when When the concentration of organic matter in the supernatant after the advanced oxidation treatment does not reach the standard, the reaction conditions need to be adjusted to continue the advanced oxidation treatment until

[0121] S4.6. Based on the evaluation results, obtain advanced oxidation pretreated water.

[0122] S5. Based on advanced oxidation pretreatment water, it is treated by reverse osmosis membrane method to obtain desalinated fresh water and brine.

[0123] S5.1. Remove residual suspended solid particles and impurities in the advanced oxidation pretreated water by precision filtration.

[0124] It should be noted that the advanced oxidation pre-treated water passes through multi-stage precision filters, which contain filter elements or filter screens with different pore sizes (such as 1 micron, 5 microns, etc.), effectively intercepting tiny suspended particles, colloids and other impurities in the water. The wastewater flows through the coarse filtration and fine filtration units in turn, and under the action of high pressure difference, all particles larger than the pore size of the filter element are completely removed. At the same time, the filter element is backwashed or replaced regularly to maintain the filtration efficiency, and finally clear and pure treated water is obtained.

[0125] S5.2. Soften the advanced oxidation pre-treated water after precision filtration.

[0126] It should be noted that the water after precision filtration first flows through a softening reactor, where it is fully mixed and reacted with a softener (such as lime, sodium carbonate or ion exchange resin) to form insoluble calcium carbonate and magnesium hydroxide precipitates. Subsequently, the water enters a sedimentation tank or sand filter, and the generated solid precipitates are removed by gravity sedimentation or filtration, ultimately obtaining softened water with low hardness.

[0127] S5.3. The softened advanced oxidation pretreated water is pressurized by a high-pressure pump and input into multiple reverse osmosis membranes. The water molecules are separated by the selective pores of the reverse osmosis membranes to form desalinated fresh water.

[0128] It should be noted that the softened water is first finely filtered to ensure that no larger particles affect the performance of the membrane; then, the high-pressure pump pressurizes the water to 6-10MPa, allowing the water to enter the reverse osmosis membrane assembly at a sufficiently high pressure. Driven by high pressure, water molecules can pass through the nanoscale selective pores on the reverse osmosis membrane due to their smaller molecular size to form desalinated fresh water, while larger soluble salts, heavy metal ions and other impurities are unable to pass through these tiny pores and are retained, and eventually gather on the concentrated water side for discharge.

[0129] S5.4. Conduct water quality assessment on desalinated water and, based on the assessment results, use the desalinated water for industrial circulating water, agricultural irrigation, and other scenarios requiring low-salinity water.

[0130] It should be noted that, firstly, representative water samples are collected from the desalinated fresh water after reverse osmosis treatment, and key water quality parameters (such as conductivity, pH value, total dissolved solids TDS, heavy metal ion concentration, etc.) are comprehensively tested using laboratory analytical instruments and online monitoring equipment. According to the preset water quality standards and application scenario requirements, it is evaluated whether the desalinated fresh water meets the needs of specific purposes;

[0131] For industrial circulating water, ensure that the water quality meets the anti-corrosion and anti-scaling requirements of the cooling system or production process;

[0132] For agricultural irrigation, check whether the water quality is suitable for the target crops and avoid soil salinization;

[0133] For other low-salt water demand scenarios, such as drinking water or food processing, ensure that the water quality is safe and meets relevant health standards;

[0134] Based on the evaluation results, qualified desalinated fresh water is transported to the corresponding water use points through dedicated pipelines, while unqualified water needs to be further processed until it meets the standards.

[0135] S5.5. Most of the soluble salts, heavy metal ions and other tiny particles are retained to form concentrated brine.

[0136] S6. The concentrated brine is converted into chemical products through bipolar membrane electrodialysis.

[0137] S6.1. Introduce concentrated brine into a bipolar membrane electrodialysis cell, and use the electric field to drive the target ions in the concentrated brine to migrate through the electrodialysis membrane to the corresponding electrode. At the same time, the target ions in the concentrated brine are separated from the impurities through the bipolar membrane, and the target ions in the concentrated brine are accumulated in the bipolar membrane area. The concentration of the target ions in the concentrated brine is calculated, and the expression is:

[0138]

[0139] Among them, N(t) is the target ion concentration in the concentrated brine at time point t, G0 is the concentration of the target ion in the concentrated brine at the initial moment, j is the electrodialysis coefficient, I(t) is the current intensity at time point t, d is the length of the active area of ​​the bipolar membrane, η is the electroosmotic efficiency of the bipolar membrane, Ф is the Faraday constant, and t is the index variable at the time point.

[0140] It should be noted that the process of separating the target ions and impurities in the concentrated brine by bipolar membrane electrodialysis is as follows:

[0141] Concentrated brine is introduced into a bipolar membrane electrodialysis cell, and the electric field is used to drive the target ions in the concentrated brine to migrate through the electrodialysis membrane to the corresponding electrodes. At the same time, through the dissociation effect of the bipolar membrane, the target ions in the concentrated brine (such as sodium ions and chloride ions) migrate to the acidic and alkaline chambers respectively, while impurities and other non-target components are retained, thereby achieving effective separation of target ions and impurities.

[0142] S6.2. After being treated by bipolar membrane electrodialysis, the target ions in the concentrated brine accumulated in the bipolar membrane area are extracted from the electrodialysis cell to finally obtain chemical products.

[0143] It should be noted that after being treated by the bipolar membrane electrodialysis method, the target ions (such as sodium ions and chloride ions) accumulated in the concentrated brine in the bipolar membrane area migrate to the acidic and alkaline chambers respectively under the action of the electric field to form high-concentration acid and alkaline solutions, which are continuously extracted from the corresponding outlets of the electrodialysis cell, and after further purification and concentration treatment, high-purity chemical products such as dilute hydrochloric acid and sodium hydroxide solution are finally obtained, thereby realizing the effective recovery and utilization of valuable components in the concentrated brine;

[0144] It should also be noted that further purification and concentration treatment to finally obtain high-purity chemical products are as follows: first, the possible residual tiny particles and colloidal substances are removed through a precision filter, and then enter the ion exchange resin column for deep impurity removal to ensure that the concentration of impurity ions in the high-concentration acid and alkali solutions is reduced to a minimum. Then, the high-concentration acid and alkali solutions are concentrated using evaporation concentration or reverse osmosis technology to increase their concentration and reduce their volume. Finally, after quality testing to confirm that they meet the standards, these high-purity chemical products (such as dilute hydrochloric acid and sodium hydroxide solutions) are stored in special storage tanks.

[0145] This embodiment also provides a high-hardness salt-containing organic wastewater resource utilization device, including: a wastewater collection and pretreatment module, an electrodialysis treatment module, an enhanced crystallization module, a separation and oxidation module, a reverse osmosis treatment module and a chemical product conversion module;

[0146] Wastewater collection and pretreatment module, used to collect high-hardness salt-containing organic wastewater and pretreat the high-hardness salt-containing organic wastewater;

[0147] The electrodialysis treatment module is used to obtain de-hardened salt water based on the pre-treated high-hardness salt-containing organic wastewater by selective ion separation through a new high-efficiency selective ion exchange membrane and electrodialysis;

[0148] An enhanced crystallization module is used to perform enhanced induced crystallization based on de-hardened brine through a fluidized bed reactor to obtain a crystallized mixed solution;

[0149] A separation and oxidation module is used to perform solid-liquid separation on the crystallization mixed solution and remove organic matter through an advanced oxidation treatment method to obtain advanced oxidation pretreated water;

[0150] Reverse osmosis treatment module, used for pre-treating water based on advanced oxidation, treating it by reverse osmosis membrane method, and obtaining desalinated fresh water and brine;

[0151] The chemical product conversion module is used to convert concentrated brine into chemical products through a bipolar membrane electrodialysis method.

[0152] This embodiment also provides a computer device, which is suitable for the method of resource utilization of high-hardness saline organic wastewater, including: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute computer-executable instructions to implement the method of resource utilization of high-hardness saline organic wastewater proposed in the above embodiment.

[0153] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a device bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating device and a computer program. The internal memory provides an environment for the operation of the operating device and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0154] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, it implements the method for resource utilization of high-hardness salt-containing organic wastewater as proposed in the above embodiment; the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination of them, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read Only Memory, referred to as EPROM), programmable read-only memory (Programmable Red-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic storage, flash memory, disk or optical disk.

[0155] In summary, the present invention adopts: a systematic high-hardness saline organic wastewater treatment process, combined with key technologies such as new high-efficiency selective ion exchange membrane electrodialysis, enhanced induced crystallization, advanced oxidation treatment and bipolar membrane electrodialysis, which not only effectively removes hardness ions and organic pollutants, but also realizes the resource utilization of wastewater, generates desalinated fresh water and valuable chemical products, significantly reduces environmental pollution, and improves the recovery rate of water resources and salt resources.

[0156] Example 2, referring to Table 1, is the second example of the present invention. To further verify the technical solution of the present invention, experimental simulation data of the resource utilization method of high-hardness salt-containing organic wastewater are provided.

[0157] In order to verify the effectiveness of the resource utilization method of high-hardness saline organic wastewater, the experiment selected high-hardness saline organic wastewater generated in the production process of a chemical plant as the research object. In the wastewater collection pool, a specially designed collection system was used to ensure that the wastewater samples were representative, and they were pretreated, including preliminary filtration to remove large particles, heavy metal ions and suspended solids, so as to provide raw water with higher purity for subsequent steps.

[0158] First, at the beginning of the experiment, high-hardness saline organic wastewater from chemical plants was collected and pretreated, including preliminary filtration to remove large particles, heavy metal ions and suspended solids, ensuring that the raw water used in subsequent steps has a high degree of purity. Subsequently, the pretreated wastewater was introduced into an electrodialysis device equipped with a new type of high-efficiency selective ion exchange membrane. By optimizing the current and voltage combination and adjusting the operating parameters in real time, efficient hardness ion removal was achieved, and de-hardened salt water that met the standards was obtained.

[0159] Secondly, the de-hardened brine was sent to a fluidized bed reactor. In an environment where porous ceramic particles were used as a crystallization reaction medium, the induced crystallization process was strengthened by precisely controlling conditions such as pH, temperature, flow rate, and gas supply pressure, and a crystallization mixture containing solid crystal particles was successfully obtained. Next, the crystallization mixture was separated into solid and liquid by a high-efficiency centrifuge. The wet cake-like solid product was used in the field of building materials, while the supernatant continued to receive ultrafiltration and advanced oxidation treatment, effectively reducing the organic matter concentration to the standard level, proving the effective removal ability of this stage of treatment method for organic pollutants.

[0160] Next, the pre-treated water after advanced oxidation treatment is further desalinated by reverse osmosis technology after precision filtration and softening, obtaining high-quality desalinated fresh water, which can be used in industrial circulating water, agricultural irrigation and other fields. At the same time, the concentrated brine is separated and prepared for the next conversion stage. In this process, the high-pressure pump pressurizes and transports water molecules through the reverse osmosis membrane, ensuring the quality of the desalinated fresh water and providing a basis for the subsequent treatment of the concentrated brine.

[0161] Finally, the concentrated brine is introduced into the bipolar membrane electrodialysis cell, where the electric field is used to promote the migration of target ions and separate the target ions from other impurities through the bipolar membrane, and finally the concentrated target ions are extracted from the bipolar membrane area and converted into valuable chemical products. The entire process strictly complies with environmental protection standards, ensuring the maximum recycling of resources, and demonstrating the important contribution of the present invention in improving wastewater treatment efficiency and promoting resource recycling.

[0162] The details are shown in Table 1 below:

[0163] Table 1 Wastewater treatment effect experimental table

[0164]

[0165] Through the analysis of the data in the above table, it can be clearly seen that compared with the traditional high-hardness salt-containing organic wastewater treatment method, the present invention has shown significant advantages in terms of significantly reduced conductivity, stable and efficient hardness ion removal efficiency, greatly reduced organic matter concentration, and precise concentration of target ions. For example, the present invention reduces the conductivity of raw wastewater from 2457.3μS / cm to 11.8μS / cm of desalinated fresh water, maintains the hardness ion removal efficiency at 83.7% to 84.4%, reduces the organic matter concentration from 125.2mg / L to 8.3mg / L, and achieves efficient concentration of target ions from 78.4ppm to 156.2ppm.

[0166] The present invention significantly improves the treatment efficiency and water purification level of high-hardness saline organic wastewater through efficient hardness ion removal, organic matter degradation and target ion concentration technology, while realizing the recycling of water resources and recovery of chemical products, reducing environmental pollution and resource waste. This method not only ensures the stability and adaptability of the treatment process, but also provides an environmentally friendly and economical solution for industrial wastewater treatment, promoting sustainable development.

[0167] 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for resource utilization of high-hardness saline organic wastewater, characterized by: include, Collect high-hardness saline organic wastewater and pre-treat the high-hardness saline organic wastewater; Based on the pre-treated high-hardness salt-containing organic wastewater, a new high-efficiency selective ion exchange membrane and electrodialysis are used for selective ion separation to obtain de-hardened salt water; Based on the de-hardened brine, enhanced induced crystallization is carried out through a fluidized bed reactor to obtain a crystallized mixed solution; Performing solid-liquid separation on the crystallized mixed liquid, and removing organic matter through an advanced oxidation treatment method to obtain advanced oxidation pretreated water; Based on advanced oxidation pretreatment water, it is treated by reverse osmosis membrane method to obtain desalinated fresh water and brine; The concentrated brine is converted into chemical products through bipolar membrane electrodialysis.

2. The method for resource utilization of high-hardness salt-containing organic wastewater according to claim 1, characterized in that: The steps of collecting high-hardness saline organic wastewater and pre-treating the high-hardness saline organic wastewater are as follows: Collect high-hardness, salty, organic wastewater from production processes and industrial discharges through wastewater collection pools; The pretreatment of high-hardness salt-containing organic wastewater includes preliminary filtration, removal of large particle matter, removal of heavy metal ions and removal of suspended solids.

3. The method for resource utilization of high-hardness salt-containing organic wastewater according to claim 2, characterized in that: The high-hardness salt-containing organic wastewater after pretreatment is subjected to selective ion separation through a new type of high-efficiency selective ion exchange membrane and electrodialysis to obtain de-hardened salt water. The specific steps are as follows: Based on the pretreated high-hardness saline organic wastewater, the hardness ions in the pretreated high-hardness saline organic wastewater are electrodialyzed by combining alternating current with direct current and using a new type of high-efficiency selective ion exchange membrane; In the electrodialysis process, by adjusting the current density, voltage and controlling the electrodialysis time, the hardness ions in the pretreated high-hardness saline organic wastewater are fully exchanged and migrated with the new high-efficiency selective ion exchange membrane; During the electrodialysis process, the conductivity and hardness ion concentration changes in the pretreated high-hardness saline organic wastewater were monitored in real time, and the hardness ion removal efficiency was calculated. The expression is: Where, F(t) is the hardness ion removal efficiency value at time point t, C n (t) is the hardness ion concentration in the pretreated high-hardness saline organic wastewater input at time point t, C o (t) is the hardness ion concentration in the pretreated high-hardness saline organic wastewater output at time point t, V(t) is the flow rate of the pretreated high-hardness saline organic wastewater at time point t, I(t) is the current intensity at time point t, V max is the maximum flow rate of the pretreated high-hardness saline organic wastewater at time point t, I max is the maximum current intensity at time t, where t is the index variable at the time point; By analyzing the historical hardness ion removal efficiency values, the hardness ion removal effect threshold Б is set; Based on the hardness ion removal efficiency value and the hardness ion removal effect threshold, the hardness ion removal effect is evaluated; When F(t)≥Б, it indicates that the hardness ion removal effect is better; When F(t)<Б, it means that the hardness ion removal effect is poor, and the flow rate and current intensity need to be adjusted until F(t)≥Б; Based on the evaluation results, de-hardened brine with removal effect reaching the standard is obtained.

4. The method for resource utilization of high-hardness salt-containing organic wastewater according to claim 3, characterized in that: The de-hardened brine is subjected to enhanced induced crystallization through a fluidized bed reactor to obtain a crystallized mixed solution. The specific steps are as follows: Using porous ceramic particles as a crystallization reaction medium in a fluidized bed reactor; The de-hardened salt water is introduced into a fluidized bed reactor to undergo a crystallization reaction with the porous ceramic particles; Adjust the pH value in the crystallization reaction by adjusting the solution with acid or alkali; The temperature and flow rate in the crystallization reaction are regulated by a heater and a temperature sensor in combination with a flow controller; Control the gas flow rate by adjusting the gas supply pressure; Based on the adjusted pH value, temperature and flow rate, the reaction parameters in the crystallization reaction are monitored in real time by an online monitoring instrument, and the reaction parameters are adjusted according to the monitoring data; During the crystallization reaction with the reaction parameters adjusted, a crystallization mixed liquid containing solid crystal particles is gradually formed in the fluidized bed reactor.

5. The method for resource utilization of high-hardness salt-containing organic wastewater according to claim 4, characterized in that: The crystallization mixed liquid is subjected to solid-liquid separation, and organic matter is removed by an advanced oxidation treatment method to obtain advanced oxidation pretreated water. The specific steps are as follows: The crystallization mixture is introduced into a high-efficiency centrifuge, and the solid crystal particles are separated from the liquid by centrifugal force under high-speed rotation. The solid particles with large particle size are separated to obtain a wet cake-like solid product and a supernatant after centrifugation; The supernatant after centrifugation is passed through an ultrafiltration membrane to remove tiny suspended particles and colloidal substances; Based on the supernatant after ultrafiltration membrane treatment, organic matter is removed by advanced oxidation treatment method, and the expression is: Where Y(t) is the organic matter concentration in the supernatant after advanced oxidation treatment at time point t, Y(0) is the initial organic matter concentration in the supernatant, k is the reaction rate constant, Q(t) is the ozone concentration at time point t, E is the activation energy, R is the ideal gas constant, T is the absolute temperature, P(t) is the gas pressure at time point, P max is the maximum allowable gas pressure, n is the gas pressure influence index, f(t) is the dynamic adjustment factor at time point t, and t is the index variable at time point; Define the organic matter concentration threshold according to the historical organic matter concentration in the supernatant after advanced oxidation treatment Based on the organic matter concentration in the supernatant after the advanced oxidation treatment and the organic matter concentration threshold, assess whether the organic matter concentration in the supernatant meets the standard; when When , it means that the organic matter concentration in the supernatant after advanced oxidation treatment reaches the standard; when When the concentration of organic matter in the supernatant after the advanced oxidation treatment does not reach the standard, the reaction conditions need to be adjusted to continue the advanced oxidation treatment until Based on the evaluation results, advanced oxidation pre-treated water is obtained.

6. The method for resource utilization of high-hardness salt-containing organic wastewater according to claim 5, characterized in that: The water is pretreated based on advanced oxidation and treated by reverse osmosis membrane method to obtain desalinated fresh water and concentrated brine. The specific steps are as follows: Remove the residual solid suspended particles and impurities in the advanced oxidation pre-treated water through precision filtration; Soften the advanced oxidation pre-treated water after precision filtration; Based on the softened advanced oxidation pre-treated water, it is pressurized by a high-pressure pump and input into multiple reverse osmosis membranes, and the water molecules are separated by the selective pores of the reverse osmosis membrane to form desalinated fresh water; Conduct water quality assessment on desalinated water and, based on the assessment results, use desalinated water for industrial circulating water, agricultural irrigation, and other scenarios that require low-salinity water; Most of the dissolved salts, heavy metal ions and other tiny particles are retained to form concentrated brine.

7. The method for resource utilization of high-hardness salt-containing organic wastewater according to claim 6, characterized in that: The concentrated brine is converted into chemical products by bipolar membrane electrodialysis method, and the specific steps are as follows: The concentrated brine is introduced into the bipolar membrane electrodialysis cell, and the target ions in the concentrated brine are driven to migrate to the corresponding electrodes through the electrodialysis membrane by the electric field. At the same time, the target ions in the concentrated brine are separated from the impurities through the bipolar membrane, and the target ions in the concentrated brine are accumulated in the bipolar membrane area. The concentration of the target ions in the concentrated brine is calculated, and the expression is: Where N(t) is the target ion concentration in the concentrated brine at time point t, G0 is the target ion concentration in the concentrated brine at the initial moment, j is the electrodialysis coefficient, I(t) is the current intensity at time point t, d is the length of the active area of ​​the bipolar membrane, η is the electroosmotic efficiency of the bipolar membrane, Ф is the Faraday constant, and t is the index variable at the time point; After being treated by bipolar membrane electrodialysis, the target ions in the concentrated brine accumulated in the bipolar membrane area are extracted from the electrodialysis cell to finally obtain chemical products.

8. A high-hardness saline organic wastewater resource utilization device, based on the high-hardness saline organic wastewater resource utilization method according to any one of claims 1 to 7, characterized in that: Including, wastewater collection and pretreatment module, electrodialysis treatment module, enhanced crystallization module, separation and oxidation module, reverse osmosis treatment module and chemical product conversion module; Wastewater collection and pretreatment module, used to collect high-hardness salt-containing organic wastewater and pretreat the high-hardness salt-containing organic wastewater; The electrodialysis treatment module is used to obtain de-hardened salt water based on the pre-treated high-hardness salt-containing organic wastewater by selective ion separation through a new high-efficiency selective ion exchange membrane and electrodialysis; An enhanced crystallization module is used to perform enhanced induced crystallization based on de-hardened brine through a fluidized bed reactor to obtain a crystallized mixed solution; A separation and oxidation module is used to perform solid-liquid separation on the crystallization mixed solution and remove organic matter through an advanced oxidation treatment method to obtain advanced oxidation pretreated water; Reverse osmosis treatment module, used for pre-treating water based on advanced oxidation, treating it by reverse osmosis membrane method, and obtaining desalinated fresh water and brine; The chemical product conversion module is used to convert concentrated brine into chemical products through a bipolar membrane electrodialysis method.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for resource utilization of high-hardness salt-containing organic wastewater as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for resource utilization of high-hardness saline organic wastewater as described in any one of claims 1 to 7 are implemented.

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