Full-amount treatment system for strong brine after membrane treatment of high-concentration wastewater

Abstract

The invention provides a full-amount treatment system for concentrated brine after membrane treatment of high-concentration wastewater. The system comprises a pretreatment unit, a strong brine treatment unit, a resource utilization unit and a mother liquor drying unit, the evaporative crystallization technology of the pretreatment unit and the evaporative crystallization technology of the strong brine treatment unit are combined, salt and harmful substances in wastewater can be effectively removed, zero emission of strong brine is achieved, and therefore the system has the advantages of being environmentally friendly and free of pollution. In addition, through the arrangement of the resource utilization unit, the treated crystalline salt and other useful substances are subjected to resource utilization, for example, the crystalline salt and other useful substances are used as chemical raw materials, building materials and the like, and cyclic utilization of resources is achieved, so that the problem of resource shortage can be relieved, and the utilization rate of the resources is increased. Extra economic benefits can be brought to enterprises; the invention belongs to the technical field of wastewater treatment technologies.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment technology, and in particular relates to a high-concentration wastewater post-membrane concentrated brine full-volume treatment system. Background Art

[0002] High-concentration wastewater refers to wastewater with high concentration of pollutants, high salt content, difficult to degrade, and requiring a combination of multiple processes for treatment. High-concentration wastewater has complex water quality, TDS is usually 1-15%, and COD cr Generally, it is above 10,000 mg / L, and may even be as high as tens of thousands to hundreds of thousands of mg / L. High-concentration wastewater mainly comes from industries such as coal chemical industry, metallurgy, printing and dyeing, papermaking, and landfill leachate, which contain high concentrations of salt, organic matter, heavy metals and other harmful substances.

[0003] Traditional wastewater treatment methods often fail to meet discharge standards and are prone to secondary pollution during the treatment process. Commonly used combined treatment processes for high-concentration wastewater include the following: 1. Physicochemical pretreatment + biochemical treatment (A 2 O / MBR) + ultrafiltration (UF) + membrane deep treatment (NF / RO); 2. Physicochemical pretreatment + membrane preconcentration (NF / RO / DTRO) + membrane deep treatment (STRO / HPRO) or evaporation treatment (MVR / triple effect).

[0004] In recent years, membrane technology has been widely used in high-concentration wastewater combined treatment processes due to its high efficiency and energy-saving characteristics. Specifically, nanofiltration (NF), reverse osmosis (RO), disc-tube reverse osmosis (DTRO), network reverse osmosis (STRO), high-pressure reverse osmosis (HPRO) and other membrane technologies have been widely used in high-concentration wastewater treatment technologies.

[0005] The concentrated brine after membrane treatment generally accounts for 15-30% of the total wastewater before membrane treatment. It has high salt content and high hardness, and ammonia nitrogen and COD cr The content is generally not high. However, if the brine after membrane treatment is discharged directly without effective treatment, it will pose a threat to the environment and ecology. Therefore, an efficient and environmentally friendly high-concentration wastewater membrane post-brine full-volume treatment system is needed to reduce the threat to the environment when the membrane post-brine is discharged. Summary of the invention

[0006] The purpose of the present invention is to provide a system for treating high-concentration wastewater post-membrane concentrated brine in full, which can reduce the threat to the environment when the post-membrane concentrated brine is discharged to the outside.

[0007] The high-concentration wastewater post-membrane concentrated brine full-volume treatment system comprises: Pretreatment unit: The pretreatment unit is used to remove calcium and magnesium hardness, alkalinity and suspended solids in the wastewater to reduce the concentration of the wastewater, thereby reducing the scaling of the pipeline caused by the evaporation and crystallization of the wastewater; A concentrated brine treatment unit, wherein the inlet end of the concentrated brine treatment unit is connected to the output end of the pretreatment unit, so that the concentrated brine formed after the pretreatment unit treats the wastewater enters the concentrated brine treatment unit, and the concentrated brine treatment unit is used to evaporate the concentrated brine to form crystals, so as to achieve zero discharge of concentrated brine; Resource utilization unit, the input of the resource utilization unit is connected to the crystal discharge end of the concentrated brine treatment unit, and the resource utilization unit is used to discharge the crystals outward for storage for the back-end equipment to make chemical raw materials, building materials or packaging; The mother liquid drying unit has an input end connected to the mother liquid output end of the evaporation crystallization module, and the mother liquid drying unit is used for drying the mother liquid. The mother liquid drying unit is provided with a waste output end.

[0008] Based on the above technical solution, the present invention achieves the following beneficial effects: 1. The high-concentration wastewater post-membrane concentrated brine full-volume treatment system adopts a combination of the pretreatment unit and the evaporation crystallization technology of the concentrated brine treatment unit, which can effectively remove salt and harmful substances in the wastewater and achieve zero discharge of concentrated brine. Therefore, when the concentrated brine after the membrane is discharged to the outside, it avoids posing a threat to the environment; 2. The high-concentration wastewater post-membrane concentrated brine full-volume treatment system is equipped with a resource utilization unit to utilize the treated crystal salt and other useful substances as resources, such as chemical raw materials, building materials, etc., to achieve resource recycling. Therefore, it can not only help alleviate the problem of resource shortage, but also bring additional economic benefits to the enterprise; 3. The high-concentration wastewater post-membrane concentrated brine full-volume treatment system is equipped with a resource utilization unit, which can achieve zero discharge of concentrated brine, thereby avoiding the pollution of the environment and ecology by harmful substances. At the same time, the high-concentration wastewater post-membrane concentrated brine full-volume treatment system has the characteristics of resource utilization. Therefore, it conforms to the concept of sustainable development and helps to achieve the coordinated development of economy, society and environment.

[0009] In order to further optimize the above technical solution, it can be optionally combined with one or more of the following implementation methods without conflict.

[0010] In some embodiments, the pre-processing unit comprises: Fine screen: after the wastewater enters the pretreatment unit, it passes through the fine screen, which is used to remove large suspended solids in the wastewater; The regulating tank is connected to the rear end of the fine screen so that the wastewater passing through the fine screen can flow into the regulating tank. The regulating tank is used to treat the wastewater in a homogenous and uniform manner. The regulating tank is equipped with a raw liquid delivery pump; The coagulation mixing tank, the stock liquid delivery pump is connected to the coagulation mixing tank, so that the stock liquid delivery pump can input the wastewater in the regulating tank into the coagulation mixing tank, and the coagulation mixing tank is equipped with a dosing unit, which is used to add chemicals to the wastewater in the coagulation mixing tank; A clarifier, wherein the input end of the clarifier is connected to the output end of the coagulation mixing tank, the clarifier is used to precipitate and separate substances from the wastewater, the brine output end of the clarifier is connected to the brine treatment unit so that the brine obtained after the substances are precipitated and separated is input into the brine treatment unit, the clarifier is connected to a sludge thickening tank via a first screw pump, the sludge thickening tank is used to further reduce the water content of the waste material after precipitation and separation from the wastewater and collect and temporarily store it, the sludge thickening tank is connected to a horizontal screw centrifuge via a second screw pump, the horizontal screw centrifuge is used to dehydrate the waste material in the sludge thickening tank, and the horizontal screw centrifuge is provided with an outlet for discharging the dehydrated waste material.

[0011] Based on the above technical solution, the present invention further achieves the following beneficial effects: 1. When the wastewater is in the coagulation mixing tank, sodium hydroxide can be added through the dosing unit to remove calcium and magnesium ions, and then polyaluminium chloride iron and polyacrylamide can be added to generate floccules with large particle diameters that are easy to settle. The wastewater then enters the clarification sedimentation tank for mud and water sedimentation separation. After that, the softened and clarified effluent can enter the brine treatment unit for evaporation, and the mud concentrated by sedimentation in the clarification sedimentation tank is sent to the horizontal screw centrifugal dehydrator for dehydration and then transported to landfill for treatment. Therefore, harmful substances in the wastewater can be effectively removed, the load of the brine treatment unit can be reduced, and the stability of the brine treatment unit can be improved; 2. The pretreatment unit can effectively remove pollutants such as calcium and magnesium hardness, alkalinity and suspended matter in the wastewater, thereby reducing the concentration of the wastewater and avoiding scaling of the heat exchange tubes of the evaporation system.

[0012] In some embodiments, the decanter centrifuge is provided with a return channel, which is used to return the wastewater separated from the waste material in the decanter centrifuge to the clarification tank or to the brine treatment unit; Based on the above technical solution, the present invention further achieves the following beneficial effects: The wastewater separated from the waste can be transported back to the clarification tank for circulation and mixed with other wastewater for treatment, or transported to the brine treatment unit for mixing with brine for evaporation treatment, so that the horizontal screw centrifuge can achieve zero sewage discharge, thereby further reducing the threat to the environment.

[0013] In some embodiments, the brine treatment unit comprises: A preheating group, the input end of the preheating group is connected to the concentrated brine output end of the clarifier, and the preheating group is used to heat the concentrated brine output from the clarifier; The output end of the preheating group is connected to the input end of the MVR separator, so that the preheated concentrated brine is input into the MVR separator. The MVR separation module is used to evaporate the input concentrated brine.

[0014] Based on the above technical solution, the present invention further achieves the following beneficial effects: The concentrated brine is preheated by the preheating group and then input into the MVR separator for evaporation and crystallization, thereby effectively improving the evaporation and crystallization efficiency and reducing the load of the MVR separator during evaporation and crystallization.

[0015] In some embodiments: The MVR separator is provided with a steam input pipeline, which is used to allow saturated steam to be input into the MVR separator to heat and evaporate the concentrated brine therein; The MVR separator is provided with a steam outlet, which is sequentially connected to a sulfuric acid scrubber and a sodium hydroxide scrubber, so that the steam generated after evaporating the concentrated brine passes through the sulfuric acid scrubber and the sodium hydroxide scrubber in sequence, so as to purify the steam before it is discharged later; The MVR separator is provided with a circulation pipeline, and the circulation pipeline is provided with an MVR circulation pump, and the MVR circulation pump is used to forcibly pump the concentrated brine in the MVR separator to flow through the heat exchange tube tube in the MVR heater at a high flow rate, so that the saturated steam input into the MVR separator from the steam input pipeline can continuously heat and evaporate all the concentrated brine.

[0016] Based on the above technical solution, the present invention further achieves the following beneficial effects: 1. The MVR separator uses forced circulation evaporation to continuously concentrate the material and reduce the water content of the crystals, thereby improving the applicable scenarios of the crystals when they are recycled in the later stage; 2. Since the concentrated brine is forced to circulate, the saturated steam input from the steam input pipeline can heat and evaporate all the concentrated brine efficiently and evenly.

[0017] In some implementations, the front end pipeline of the MVR circulation pump is connected to an emergency pump, and the output end of the emergency pump is connected to an emergency pool.

[0018] Based on the above technical solution, the present invention further achieves the following beneficial effects: When the MVR circulating pump circulates the concentrated brine at a high flow rate, if the heat exchange tubes in the MVR heater are fully loaded, the leaked concentrated brine can be collected and buffered in the accident pool, thereby facilitating subsequent processing and preventing the leakage of concentrated brine.

[0019] In some embodiments: The concentrated brine output by the MVR circulation pump passes through the MVR heater before entering the MVR separator; The output point of the sodium hydroxide scrubbing tower is connected to an MVR steam compressor, and the output end of the MVR steam compressor is connected to the steam input end of the MVR heater, so that the MVR steam compressor heats and heats the steam output from the sodium hydroxide scrubbing tower and inputs it into the MVR heater to heat the concentrated brine passing through the MVR heater. The steam output end of the MVR heater is used to connect to the exhaust gas treatment system, and the exhaust gas treatment system is used to purify the steam output from the MVR heater and discharge it to the outside.

[0020] Based on the above technical solution, the present invention further achieves the following beneficial effects: 1. Since the secondary steam output by the MVR separator has a certain thermal temperature, the steam is heated and pressurized by the MVR steam compressor, so that the MVR heater can use the thermal energy of the steam to heat the concentrated brine passing through the MVR heater, thereby reducing the energy consumption of the system by rationally utilizing the steam thermal energy; 2. When the steam output from the MVR separator passes through the sulfuric acid scrubber and the sodium hydroxide scrubber, the heat energy and pressure of the steam will be lost to a certain extent. At this time, the MVR steam compressor can increase the steam to a sufficient pressure and temperature, thereby efficiently heating the concentrated brine passing through the MVR heater; 3. Since the MVR steam compressor can pressurize and heat the steam, the steam can more efficiently exchange heat with the concentrated brine passing through the MVR heater; 4. When the MVR circulation pump transports the concentrated brine back to the MVR separator, it is preheated by the MVR heater, thereby improving the evaporation efficiency of the MVR separator.

[0021] In some embodiments: The preheating group includes a first MVR heat exchanger, an intermediate temporary storage tank, an MVR delivery pump and a second MVR heat exchanger which are sequentially connected by pipelines, so that the concentrated brine output from the clarification tank passes through the first MVR heat exchanger and enters the intermediate temporary storage tank. The intermediate temporary storage tank is provided with a pH adjustment module for conditioning the concentrated brine in the intermediate temporary storage tank. The MVR delivery pump is used to extract the concentrated brine in the intermediate temporary storage tank and output it through the second MVR heat exchanger and then input it into the MVR separator for heating and evaporation; The MVR heater is connected to an MVR distilled water tank, which is used to collect distilled water in the MVR heater. The output end of the MVR distilled water tank is connected to an MVR distilled water pump, which outputs the distilled water in the MVR distilled water tank in parallel through the first MVR heat exchanger and the second MVR heat exchanger, so that the distilled water preheats the concentrated brine passing through the first MVR heat exchanger and the concentrated brine passing through the second MVR heat exchanger. The distilled water flows into the distilled water cooler in parallel through the first MVR heat exchanger and the second MVR heat exchanger. The distilled water cooler is provided with a circulating cooling water system for thoroughly cooling the distilled water therein. After being cooled in the distilled water cooler, the distilled water flows out to the clean water tank for discharge.

[0022] Based on the above technical solution, the present invention further achieves the following beneficial effects: 1. Before the concentrated brine output from the clarifier enters the MVR separator, the concentrated brine is preheated by passing it through the first MVR heat exchanger and the second MVR heat exchanger, thereby further improving the evaporation efficiency of the MVR separator; 2. When the steam passing through the MVR heater exchanges heat with the concentrated brine passing through the MVR heater, part of the steam will be cooled to form distilled water. However, since there is continuous steam passing through the MVR heater, the distilled water also has a certain thermal temperature. At this time, the distilled water is transported to the first MVR heat exchanger and the second MVR heat exchanger to heat the concentrated brine passing through the first MVR heat exchanger and the second MVR heat exchanger, thereby rationally utilizing the thermal energy of the distilled water and reducing the energy consumption of the system.

[0023] In some embodiments, the resource utilization unit includes an MVR concentrate pump, a cyclone, and a two-stage pusher centrifuge; MVR concentrate pump: after the concentrated brine circulates and evaporates into concentrated liquid in the MVR separator, the MVR concentrate pump extracts the concentrated liquid and delivers it to the cyclone. The pipeline between the MVR concentrate pump and the cyclone is connected in parallel with the pipeline connected to the MVR separator, so that the remaining concentrated liquid after the MVR concentrate pump delivers it to the cyclone flows back to the MVR separator to mix with the concentrated brine and circulate and evaporate; The cyclone is used to perform preliminary solid-liquid separation on the concentrated liquid. The solids formed at the bottom of the cyclone are transported to the double-stage pusher centrifuge, and the mother liquor at the top of the cyclone is transported to the mother liquor drying unit; The two-stage pusher centrifuge is used to reduce the water content of the solids, and finally form crystalline salt crystals to enter the fluidized bed drying system. The output end of the fluidized bed drying system is connected to the crystalline salt packaging module. The mother liquor generated by the two-stage pusher centrifuge to separate the solids is transported to the mother liquor drying unit.

[0024] Based on the above technical solution, the present invention further achieves the following beneficial effects: 1. To further dry the material obtained after evaporation from the MVR separator, so as to improve the suitability of the material for the scene; 2. When the double-stage pusher centrifuge dehydrates the solids, the liquid separated from the solids (i.e., mother liquor) and the mother liquor on the upper part of the cyclone are collected and transported to the mother liquor drying unit, so that the mother liquor drying unit can further process the mother liquor.

[0025] In some embodiments, the mother liquor drying unit includes an MVR mother liquor tank, an MVR mother liquor pump, a mother liquor drying module, and a sludge packaging module; MVR mother liquid tank, which is used to receive the mother liquid output from the cyclone and the two-stage pusher centrifuge; An MVR mother liquid pump, which is connected to the MVR mother liquid tank to extract the mother liquid in the MVR mother liquid tank and output it to the mother liquid drying module; The mother liquor drying module is provided with a steam system for final evaporation and drying of the input mother liquor, and the liquid produced thereafter is transported back to the MVR separator; The sludge packaging module is connected to the mother liquor drying module to package the sludge formed after evaporation and drying of the mother liquor.

[0026] Based on the above technical solution, the present invention further achieves the following beneficial effects: 1. Further evaporating part of the water from the mother liquor to reduce the water content of the mother liquor, thereby facilitating the discharge and treatment of substances in the mother liquor; 2. Part of the mother liquor, or the residual mother liquor after treatment, can be transported back to the MVR separator to mix with concentrated brine for secondary circulation evaporation, so as to further refine the substances in the mother liquor, thereby making it easier to discharge and process the substances in the mother liquor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation of the present invention, the following is a brief description of the drawings and reference numerals required to be used in describing the specific implementation.

[0028] Figure 1 It is a structural layout diagram of the present invention.

[0029] Reference numerals: 11. Regulating tank; 12. Raw liquid delivery pump; 13. Coagulation mixing tank; 14. Dosing unit; 15. Clarifying tank; 16. First screw pump; 17. Sludge thickening tank; 18. Second screw pump; 19. Horizontal screw centrifuge; 2. MVR separator; 21. MVR circulation pump; 22. MVR heater; 23. Emergency pump; 231. Accident tank; 24. Saturated steam inlet; 31. Sulfuric acid scrubber; 32. Sodium hydroxide scrubber; 33. MVR steam compressor; 34. Tail gas treatment system; 4 1. The first MVR heat exchanger; 42. The intermediate temporary storage tank; 43. The MVR transfer pump; 44. The second MVR heat exchanger; 45. The pH adjustment module; 46. The MVR distilled water tank; 47. The MVR distilled water pump; 48. The distilled water cooler; 49. The clear water tank; 51. The MVR concentrate pump; 52. The cyclone; 53. The two-stage push centrifuge; 54. The crystallized salt packaging module; 61. The MVR mother liquor tank; 62. The MVR mother liquor pump; 63. The mother liquor drying module; 64. The sludge packaging module. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, examples are given below with reference to the accompanying drawings.

[0031] Preface High-concentration wastewater refers to wastewater with high concentration of pollutants, high salt content, difficult to degrade, and requiring a combination of multiple processes for treatment. High-concentration wastewater has complex water quality, TDS is usually 1-15%, and COD cr Generally, it is above 10,000 mg / L, and may even be as high as tens of thousands to hundreds of thousands of mg / L. High-concentration wastewater mainly comes from industries such as coal chemical industry, metallurgy, printing and dyeing, papermaking, and landfill leachate, which contain high concentrations of salt, organic matter, heavy metals and other harmful substances.

[0032] Traditional wastewater treatment methods often fail to meet discharge standards and are prone to secondary pollution during the treatment process. Commonly used combined treatment processes for high-concentration wastewater include the following: 1. Physicochemical pretreatment + biochemical treatment (A 2 O / MBR) + ultrafiltration (UF) + membrane deep treatment (NF / RO); 2. Physicochemical pretreatment + membrane preconcentration (NF / RO / DTRO) + membrane deep treatment (STRO / HPRO) or evaporation treatment (MVR / triple effect).

[0033] In recent years, membrane technology has been widely used in high-concentration wastewater combined treatment processes due to its high efficiency and energy-saving characteristics. Specifically, nanofiltration (NF), reverse osmosis (RO), disc-tube reverse osmosis (DTRO), network reverse osmosis (STRO), high-pressure reverse osmosis (HPRO) and other membrane technologies have been widely used in high-concentration wastewater treatment technologies.

[0034] The concentrated brine after membrane treatment generally accounts for 15-30% of the total wastewater before membrane treatment. It has high salt content and high hardness, and ammonia nitrogen and COD cr The content is generally not high. However, if the brine after membrane treatment is discharged directly without effective treatment, it will pose a threat to the environment and ecology. Therefore, an efficient and environmentally friendly high-concentration wastewater membrane post-brine full-volume treatment system is needed to reduce the threat to the environment when the membrane post-brine is discharged.

[0035] Based on this, this specific embodiment provides a full-scale treatment system for high-concentration wastewater post-membrane concentrated brine, which mainly realizes the full-scale treatment and resource utilization of high-concentration wastewater post-membrane concentrated brine through integrated pretreatment, MVR forced circulation evaporation crystallization technology, resource utilization technology and mother liquor drying technology. At the same time, when the post-membrane concentrated brine is discharged to the outside, the threat to the environment can be reduced. It has the characteristics of high treatment efficiency, low energy consumption, stable operation, and environmental friendliness. It is suitable for high-concentration wastewater discharge industries such as coal chemical industry, metallurgy, printing and dyeing, papermaking, and landfill leachate.

[0036] content like Figure 1 As shown, the high-concentration wastewater post-membrane concentrated brine full-scale treatment system includes a pretreatment unit, a concentrated brine treatment unit, a resource utilization unit and a mother liquor drying unit.

[0037] Pretreatment unit: The pretreatment unit is used to remove pollutants in wastewater, such as calcium and magnesium hardness, alkalinity and suspended solids, reduce wastewater concentration, and improve subsequent treatment efficiency, thereby reducing scaling of pipelines caused by evaporation and crystallization of wastewater; The concentrated brine treatment unit is connected with the output end of the pretreatment unit to allow the concentrated brine formed after the pretreatment unit treats the wastewater to enter the concentrated brine treatment unit. The concentrated brine treatment unit is used to further treat the concentrated brine after membrane treatment, and adopts evaporation crystallization technology to remove the salt of the concentrated brine to form crystals, so as to achieve zero discharge of concentrated brine.

[0038] A resource utilization unit, the input end of which is connected to the crystal discharge end of the brine treatment unit. The resource utilization unit is used to discharge the crystals outward for storage so as to be used by back-end equipment to make chemical raw materials, building materials or packaging.

[0039] The mother liquid drying unit has an input end connected to the mother liquid output end of the evaporation crystallization module, and the mother liquid drying unit is used to dry the mother liquid. The mother liquid drying unit is provided with a waste output end.

[0040] The high-concentration wastewater post-membrane concentrated brine full-volume treatment system can effectively remove salt and harmful substances in wastewater and achieve zero discharge of concentrated brine by combining the evaporation and crystallization technology of the pretreatment unit and the brine treatment unit. Therefore, when the post-membrane concentrated brine is discharged, it avoids posing a threat to the environment; the high-concentration wastewater post-membrane concentrated brine full-volume treatment system is set up with a resource utilization unit to utilize the treated crystalline salt and other useful substances as resources, such as as chemical raw materials, building materials, etc., to achieve the recycling of resources. Therefore, it can not only help alleviate the problem of resource shortages, but also bring additional economic benefits to the enterprise; the high-concentration wastewater post-membrane concentrated brine full-volume treatment system is set up with a resource utilization unit because it can achieve zero discharge of concentrated brine, thereby avoiding the pollution of harmful substances to the environment and ecology. At the same time, the high-concentration wastewater post-membrane concentrated brine full-volume treatment system has the characteristics of resource utilization. Therefore, it conforms to the concept of sustainable development and helps to achieve the coordinated development of economy, society and environment.

[0041] The preprocessing unit includes the following structures: Fine screen: after the wastewater enters the pretreatment unit, it passes through the fine screen, which is used to remove large suspended solids in the wastewater; The regulating tank 11 is connected to the rear end of the fine screen so that the wastewater passing through the fine screen can flow into the regulating tank 11. The regulating tank 11 is used to treat the wastewater in a homogenous and uniform manner. The regulating tank 11 is equipped with a raw liquid delivery pump 12; The coagulation mixing tank 13, the raw liquid delivery pump 12 is connected to the coagulation mixing tank 13, so that the raw liquid delivery pump 12 can input the wastewater in the regulating tank 11 into the coagulation mixing tank 13, and the coagulation mixing tank 13 is equipped with a dosing unit 14, and the dosing unit 14 is used to add a pharmaceutical agent to the wastewater in the coagulation mixing tank 13; A clarifier 15, the input end of the clarifier 15 is connected to the output end of the coagulation mixing tank 13, the clarifier 15 is used to precipitate and separate substances from the wastewater, the brine output end of the clarifier 15 is connected to the brine treatment unit, so that the brine obtained after the precipitation and separation of the substances can be input into the brine treatment unit, the clarifier 15 is connected to the sludge thickening tank 17 through the first screw pump 16, the sludge thickening tank 17 is used to further reduce the water content of the waste material after precipitation and separation from the wastewater and collect and temporarily store it, the sludge thickening tank 17 is connected to the horizontal screw centrifuge 19 through the second screw pump 18, the horizontal screw centrifuge 19 is used to dehydrate the waste material in the sludge thickening tank 17, and the horizontal screw centrifuge 19 is provided with a discharge port for discharging the dehydrated waste material.

[0042] When the wastewater is in the coagulation mixing box 13, sodium hydroxide can be first added through the dosing unit 14 to remove calcium and magnesium ions, and then polyaluminum chloride ferric and polyacrylamide can be added to generate flocculants with larger particle diameters that are easy to settle. The wastewater then enters the clarification sedimentation tank for mud and water sedimentation separation. Thereafter, the softened and clarified effluent can enter the brine treatment unit for evaporation, and the mud after sedimentation and concentration in the clarification sedimentation tank is sent to the horizontal screw centrifugal dehydrator for dehydration and then transported to landfill treatment. Therefore, harmful substances in the wastewater are effectively removed, the load of the brine treatment unit is reduced, and the stability of the brine treatment unit is improved; the pretreatment unit can effectively remove pollutants such as calcium and magnesium hardness, alkalinity, and suspended matter in the wastewater, thereby reducing the concentration of the wastewater and avoiding scaling of the heat exchange tubes of the evaporation system.

[0043] The decanter centrifuge 19 is provided with a return channel, which is used to send the waste water separated from the waste material in the decanter centrifuge 19 back to the clarification tank 15 or to the brine treatment unit.

[0044] The wastewater separated from the waste material can be transported back to the clarification tank 15 for circulation and mixing with other wastewater for treatment, or transported to the brine treatment unit for mixing with brine for evaporation treatment, so that the horizontal screw centrifuge 19 can achieve zero sewage discharge, thereby further reducing the threat to the environment.

[0045] Based on the above, the pretreatment unit can remove large suspended solids from the wastewater through fine screens, regulating tank 11, coagulation and mixing tank 13, clarification tank 15, dosing system and other equipment, and then enter the regulating tank 11 for homogenization and equalization treatment. The effluent from the regulating tank 11 is first lifted by the stock liquid delivery pump 12 to the coagulation and mixing tank 13, and sodium hydroxide is first added to the coagulation and mixing tank 13 to remove calcium and magnesium ions, and then polyaluminum chloride iron and polyacrylamide are added to generate easy-to-sediment flocculants with large particle diameters. The wastewater then enters the clarification and sedimentation tank for mud and water sedimentation separation, and the softened and clarified effluent enters the next-level MVR forced circulation evaporation and crystallization system. The mud after sedimentation and concentration in the clarification and sedimentation tank is sent to the horizontal screw centrifugal dehydrator for dehydration and then transported to landfill. Therefore, the pretreatment unit can be used to remove large molecular organic matter such as calcium and magnesium hardness, alkalinity, and suspended solids in the wastewater, reduce the concentration of wastewater, improve the efficiency of subsequent treatment, and avoid scaling of the heat exchange tube bundle of the subsequent evaporation and crystallization unit.

[0046] Wherein, the concentrated brine treatment unit comprises the following structure: A preheating group, the input end of the preheating group is connected to the concentrated brine output end of the clarification tank 15, and the preheating group is used to heat the concentrated brine output from the clarification tank 15; The output end of the preheating group of the MVR separator 2 is connected to the input end of the MVR separator 2, so that the preheated concentrated brine is input into the MVR separator 2. The MVR separation module is used to evaporate the input concentrated brine.

[0047] After the concentrated brine is preheated by the preheating group, the preheated concentrated brine is input into the MVR separator 2 for evaporation and crystallization, thereby effectively improving the evaporation and crystallization efficiency and reducing the load of the MVR separator 2 during evaporation and crystallization.

[0048] The MVR separator is provided with a steam input pipeline, which is used to allow saturated steam to be input into the MVR separator to heat and evaporate the concentrated brine therein; The MVR separator is provided with a steam outlet, which is sequentially connected to a sulfuric acid scrubber 31 and a sodium hydroxide scrubber 32, so that the steam generated after evaporating the concentrated brine passes through the sulfuric acid scrubber 31 and the sodium hydroxide scrubber 32 in sequence, so as to purify the steam before it is discharged later; The MVR separator is provided with a circulation pipeline, and the circulation pipeline is provided with an MVR circulation pump 21. The MVR circulation pump 21 is used to force the concentrated brine in the MVR separator to flow through the heat exchange tube tube in the MVR heater 22 at a high flow rate, so that the saturated steam input into the MVR separator from the steam input pipeline can continuously heat and evaporate all the concentrated brine.

[0049] The MVR separator uses a forced circulation evaporation method to continuously concentrate the material and reduce the water content of the crystals, thereby improving the applicability of the crystals when they are recycled in the later stage. Since the concentrated brine is forced to circulate, the saturated steam input from the steam input pipeline can heat and evaporate all the concentrated brine efficiently and evenly.

[0050] The front end pipeline of the MVR circulation pump 21 is connected to an emergency pump 23 , and the output end of the emergency pump 23 is connected to an emergency pool 231 .

[0051] When the MVR circulation pump 21 circulates the concentrated brine at a high flow rate, if the heat exchange tubes in the MVR heater 22 are fully loaded, the leaked concentrated brine can be collected and buffered in the accident pool 231, thereby facilitating subsequent processing and preventing concentrated brine leakage.

[0052] The concentrated brine output by the MVR circulation pump 21 passes through the MVR heater 22 before entering the MVR separator; The output point of the sodium hydroxide scrubber 32 is connected to an MVR steam compressor 33, and the output end of the MVR steam compressor 33 is connected to the steam input end of the MVR heater 22, so that the MVR steam compressor 33 heats the steam output from the sodium hydroxide scrubber 32 and inputs it into the MVR heater 22, so as to heat the concentrated brine passing through the MVR heater 22. The steam output end of the MVR heater 22 is used to be connected to an exhaust gas treatment system 34, and the exhaust gas treatment system 34 is used to purify the steam output from the MVR heater 22 and discharge it to the outside.

[0053] Since the steam outputted by the MVR separator has a certain thermal temperature, at this time, the steam is pressurized and reheated by the MVR steam compressor 33, so that the MVR heater 22 can use the thermal energy of the steam to heat the concentrated brine passing through the MVR heater 22, so as to achieve reasonable steam utilization of thermal energy, thereby reducing the energy consumption of the system; at the same time, since the steam outputted by the MVR separator passes through the sulfuric acid scrubber 31 and the sodium hydroxide scrubber 32, the thermal energy and pressure of the steam will be lost to a certain extent. At this time, the MVR steam compressor 33 can increase the steam to a sufficient pressure and temperature, so as to efficiently heat the concentrated brine passing through the MVR heater 22; in addition, since the MVR steam compressor 33 can pressurize the steam, the steam can more efficiently exchange heat with the concentrated brine passing through the MVR heater 22; further, when the MVR circulation pump 21 transports the concentrated brine back to the MVR separator, the concentrated brine is pre-heated by the MVR heater 22, thereby improving the evaporation efficiency of the MVR separator.

[0054] The preheating group adopts the following structure: The preheating group includes a first MVR heat exchanger 41, an intermediate temporary storage tank 42, an MVR delivery pump 43 and a second MVR heat exchanger 44 which are sequentially connected by pipelines, so that the concentrated brine output from the clarification tank 15 enters the intermediate temporary storage tank 42 through the first MVR heat exchanger 41, and the intermediate temporary storage tank 42 is provided with a pH adjustment module 45 for conditioning the concentrated brine in the intermediate temporary storage tank 42. The MVR delivery pump 43 is used to extract the concentrated brine in the intermediate temporary storage tank 42 and output it through the second MVR heat exchanger 44 and then input it into the MVR separator for heating and evaporation; The MVR heater 22 is connected to an MVR distilled water tank 46, which is used to collect the distilled water in the MVR heater 22. The output end of the MVR distilled water tank 46 is connected to an MVR distilled water pump 47, which outputs the distilled water in the MVR distilled water tank 46 in parallel through the first MVR heat exchanger 41 and the second MVR heat exchanger 44, so that the distilled water preheats the concentrated brine passing through the first MVR heat exchanger 41 and the concentrated brine passing through the second MVR heat exchanger 44. The distilled water flows into the distilled water cooler 48 in parallel through the first MVR heat exchanger 41 and the second MVR heat exchanger 44. The distilled water cooler 48 is provided with a circulating cooling water system for thoroughly cooling the distilled water therein. After being cooled in the distilled water cooler 48, the distilled water flows out to the clean water tank 49 for discharge.

[0055] Before the concentrated brine output from the clarification tank 15 enters the MVR separator, the concentrated brine is preheated by passing it through the first MVR heat exchanger 41 and the second MVR heat exchanger 44, thereby further improving the evaporation efficiency of the MVR separator; when the steam passing through the MVR heater 22 exchanges heat with the concentrated brine passing through the MVR heater 22, part of the steam is cooled to form distilled water. However, since there is continuous steam passing through the MVR heater 22, the distilled water also has a certain thermal temperature. At this time, the distilled water is transported to the first MVR heat exchanger 41 and the second MVR heat exchanger 44 to heat the concentrated brine passing through the first MVR heat exchanger 41 and the second MVR heat exchanger 44, thereby rationally utilizing the thermal energy of the distilled water and reducing the energy consumption of the system.

[0056] Based on the above, the concentrated brine treatment unit uses MVR forced circulation evaporation and crystallization technology to further treat the concentrated brine. The concentrated brine first enters the MVR heat exchanger for preheating, and then enters the evaporator for evaporation and crystallization. The evaporator adopts a forced circulation method to evaporate the water in the concentrated brine by heating to form crystalline salt. In the evaporation system, the circulating liquid in the concentrated brine and the MVR separator flows through the heat exchange tube tube of the MVR heater 22 at a large flow rate through the forced circulation pump, and exchanges heat with the secondary steam in the shell side. After the temperature of the liquid increases, flash evaporation produces secondary steam, and the material is continuously concentrated. The secondary steam generated by flash evaporation first enters the sulfuric acid scrubber 31, and the ammonia nitrogen volatilized into the steam in the concentrated brine reacts with sulfuric acid to generate ammonium sulfate and is removed. The steam after passing through the sulfuric acid scrubber 31 continues to enter the sodium hydroxide scrubber 32, and the volatile organic matter in the steam reacts with sodium hydroxide to generate organic sodium salt and is removed. Therefore, the principle of concentrated brine treatment evaporates the water in the concentrated brine by using evaporation and crystallization technology to form crystalline salt, thereby achieving zero discharge of concentrated brine.

[0057] In addition, the secondary steam after passing through the sodium hydroxide scrubber 32 enters the MVR steam compressor 33, which compresses the secondary steam generated by the evaporator to increase its pressure and temperature, and then returns to the shell side of the heat exchange tubes of the MVR heater 22 as the evaporator heat source to replace the fresh steam, and exchanges heat with the feed liquid in the tube side, so that the temperature of the feed liquid is increased and boiled. In this way, the thermal energy of the secondary steam can be reused repeatedly. Compared with traditional multi-effect evaporation, MVR evaporation does not require fresh steam, nor does it require a large amount of circulating cooling water to cool the secondary steam, and has lower operating costs.

[0058] The resource utilization unit includes an MVR concentrate pump 51, a cyclone 52 and a two-stage pusher centrifuge 53; MVR concentrate pump 51, after the concentrated brine circulates and evaporates into concentrated liquid in the MVR separator, the MVR concentrate pump 51 extracts the concentrated liquid and delivers it to the cyclone 52. The pipeline between the MVR concentrate pump 51 and the cyclone 52 is connected in parallel with the pipeline connected to the MVR separator, so that the remaining concentrated liquid after the MVR concentrate pump 51 delivers it to the cyclone 52 is returned to the MVR separator to be mixed with the concentrated brine for cyclic evaporation; The cyclone 52 is used to perform preliminary solid-liquid separation on the concentrated liquid. The solid formed at the bottom of the cyclone 52 is transported to the double-stage pusher centrifuge 53, and the mother liquid on the upper part of the cyclone 52 is transported to the mother liquid drying unit; The two-stage pusher centrifuge 53 is used to reduce the water content of the solids, and finally form crystallized salt crystals to enter the fluidized bed drying system. The output end of the fluidized bed drying system is connected to the crystallized salt packaging module 54. The mother liquor generated by the two-stage pusher centrifuge 53 separating the solids is transported to the mother liquor drying unit.

[0059] Therefore, the material obtained after evaporation from the MVR separator is further dried, thereby improving the suitability of the material for the scene; at the same time, since the two-stage pusher centrifuge 53 dehydrates the solid, the liquid (that is, mother liquor) separated from the solid and the mother liquor on the cyclone 52 are collected and transported to the mother liquor drying unit, which facilitates the mother liquor drying unit to further process the mother liquor.

[0060] Based on the above, the resource utilization unit utilizes the treated crystallized salt and other useful substances for resource utilization. Crystallized salt can be used as chemical raw materials, building materials, etc., and other useful substances can be treated accordingly according to their properties. The wastewater liquid in the evaporation system is continuously circulated and evaporated, and the concentration continues to increase after the water content is reduced. When the density of the concentrated material reaches the set density value, the MVR concentrate pump 51 outputs the material to the cyclone 52 for preliminary solid-liquid separation. The solids at the bottom of the cyclone 52 enter the two-stage pusher centrifuge 53, which further reduces the water content of the solids, and finally forms crystallized salt crystals and then enters the fluidized bed drying system and the crystallized salt packaging module 54. The crystallized salt is packaged and recycled for resource utilization. The filtrate of the cyclone 52 and the two-stage pusher centrifuge 53 enters the mother liquid tank for temporary storage, and then enters the mother liquid drying system for drying treatment. Therefore, the resource utilization principle can realize the resource utilization of the treated crystallized salt and other useful substances, such as chemical raw materials, building materials, etc., to achieve the recycling of resources.

[0061] The mother liquor drying unit includes an MVR mother liquor tank 61, an MVR mother liquor pump 62, a mother liquor drying module 63 and a sludge packaging module 64; The MVR mother liquid tank 61 is used to receive the mother liquid output from the cyclone 52 and the two-stage pusher centrifuge 53; An MVR mother liquid pump 62 connected to the MVR mother liquid tank 61 to extract the mother liquid in the MVR mother liquid tank 61 and output it to the mother liquid drying module 63; The mother liquor drying module 63 is provided with a steam system for final evaporation and drying of the input mother liquor, and the liquid produced thereafter is transported back to the MVR separator; The sludge packaging module 64 is connected to the mother liquid drying module 63 and is used to package the sludge formed after the mother liquid is evaporated and dried.

[0062] Therefore, the water content of the mother liquor can be reduced by further evaporating part of the water from the mother liquor, thereby facilitating the discharge of substances in the mother liquor; and part of the mother liquor, or the residual mother liquor after treatment, can be transported back to the MVR separator to be mixed with concentrated brine for secondary circulation evaporation, so as to further refine the substances in the mother liquor, thereby making it easier to discharge substances in the mother liquor.

[0063] Based on the above, the mother liquor in the mother liquor tank is fed into the mother liquor dryer through the mother liquor pump for drying treatment. The main components of the mother liquor are high-boiling point materials, organic matter, scaling factors, etc. The moisture content of the residue finished product after drying by the mother liquor dryer is about 10-30%. The dried residue is transported out for treatment. Therefore, the mother liquor drying unit can realize the drying treatment of the discharged mother liquor generated by the evaporation crystallization unit, and provide an outlet for the high-boiling point materials, organic matter, scaling factors, etc. concentrated in the evaporation system.

[0064] Finally, since the MVR separator and the MVR heater 22 are non-standard equipment, they can be prefabricated or processed into integrated skid-mounted equipment in the factory and then transported to the project site for assembly, and the on-site installation time is short.

[0065] In summary, firstly, the above-mentioned high-concentration wastewater post-membrane concentrated brine full-volume treatment system adopts a treatment method combining pretreatment technology and evaporation crystallization technology, which can effectively remove salt and harmful substances in wastewater and achieve zero discharge of concentrated brine. At the same time, the system reduces energy consumption and operating costs by optimizing treatment processes and equipment. Secondly, the high-concentration wastewater post-membrane concentrated brine full-volume treatment system will use the treated crystallized salt and other useful substances as resources, such as chemical raw materials, building materials, etc., to achieve resource recycling, which not only helps to alleviate the problem of resource shortages, but also brings additional economic benefits to enterprises. Finally, the high-concentration wastewater post-membrane concentrated brine full-volume treatment system achieves zero discharge of concentrated brine, avoiding the pollution of harmful substances to the environment and ecology. At the same time, the resource utilization characteristics of the system are in line with the concept of sustainable development and help to achieve the coordinated development of economy, society and environment.

Claims

1. A high-concentration wastewater post-membrane concentrated brine full-volume treatment system, characterized in that: include: A pretreatment unit, which is used to remove substances such as calcium and magnesium hardness, alkalinity and suspended matter in the wastewater to reduce the concentration of the wastewater, thereby reducing scaling of the pipeline caused by subsequent evaporation and crystallization of the wastewater; A concentrated brine treatment unit, wherein the inlet end of the concentrated brine treatment unit is connected to the output end of the pretreatment unit, so that the concentrated brine formed after the pretreatment unit treats the wastewater enters the concentrated brine treatment unit, and the concentrated brine treatment unit is used to evaporate the concentrated brine to form crystals to achieve zero discharge of concentrated brine; A resource utilization unit, the input of which is connected to the crystal discharge end pipeline of the concentrated brine treatment unit, and the resource utilization unit is used to discharge the crystals to the outside for storage so as to be used by the back-end equipment to make chemical raw materials or building materials; A mother liquor drying unit, wherein the input end of the mother liquor drying unit is connected to the mother liquor output end pipeline of the evaporation crystallization module, the mother liquor drying unit is used to dry the mother liquor, and the mother liquor drying unit is provided with a waste output end.

2. A high-concentration wastewater post-membrane concentrated brine full-volume treatment system according to claim 1, characterized in that: The pre-processing unit comprises: A fine screen, after the wastewater enters the pretreatment unit, it passes through the fine screen, and the fine screen is used to remove large suspended solids in the wastewater; A regulating tank (11), the regulating tank (11) being connected to the rear end of the fine screen so that the wastewater passing through the fine screen can flow into the regulating tank (11), the regulating tank (11) being used to perform homogenization and equalization treatment on the wastewater, and the regulating tank (11) being equipped with a raw liquid delivery pump (12); A coagulation stirring tank (13), wherein the raw liquid delivery pump (12) is connected to the coagulation stirring tank (13) via a pipeline so that the raw liquid delivery pump (12) can input the wastewater in the regulating tank (11) into the coagulation stirring tank (13), and the coagulation stirring tank (13) is equipped with a dosing unit (14), and the dosing unit (14) is used to add a chemical to the wastewater in the coagulation stirring tank (13); A clarifier (15), wherein the input end of the clarifier (15) is connected to the output end of the coagulation mixing tank (13) by a pipeline, the clarifier (15) is used to precipitate and separate substances from the wastewater, the brine output end of the clarifier (15) is connected to the brine treatment unit pipeline so that the brine obtained after the substances are precipitated and separated is input into the brine treatment unit, the clarifier (15) is connected to a sludge thickening tank (17) via a first screw pump (16), the sludge thickening tank (17) is used to further reduce the water content of the waste material after precipitation and separation from the wastewater and collect and temporarily store it, the sludge thickening tank (17) is connected to a horizontal screw centrifuge (19) via a second screw pump (18), the horizontal screw centrifuge (19) is used to dehydrate the waste material in the sludge thickening tank (17), and the horizontal screw centrifuge (19) is provided with a discharge port for discharging the dehydrated waste material.

3. A high-concentration wastewater post-membrane concentrated brine full-volume treatment system according to claim 2, characterized in that: The decanter centrifuge (19) is provided with a reflow channel, and the reflow channel is used to send the wastewater separated from the waste material in the decanter centrifuge (19) back to the clarification tank (15) or to the brine treatment unit.

4. A high-concentration wastewater post-membrane concentrated brine full-volume treatment system according to claim 2, characterized in that: The concentrated brine treatment unit comprises: A preheating group, the input end of the preheating group is connected to the concentrated brine output end of the clarification tank (15), and the preheating group is used to heat the concentrated brine output from the clarification tank (15); An MVR separator (2), wherein the output end of the preheating group is connected to the input end of the MVR separator (2), so that the preheated concentrated brine is input into the MVR separator (2), and the MVR separation module is used to evaporate the input concentrated brine.

5. A high-concentration wastewater post-membrane concentrated brine full-volume treatment system according to claim 4, characterized in that: The MVR separator is provided with a steam input pipeline, and the steam input pipeline is used to allow saturated steam to be input into the MVR separator to heat and evaporate the concentrated brine therein; The MVR separator is provided with a steam outlet, and the steam outlet is sequentially connected to a sulfuric acid scrubber (31) and a sodium hydroxide scrubber (32), so that the steam generated after evaporating the concentrated brine passes through the sulfuric acid scrubber (31) and the sodium hydroxide scrubber (32) in sequence, so as to purify the steam before it is discharged later; The MVR separator is provided with a circulation pipeline, and the circulation pipeline is provided with an MVR circulation pump (21). The MVR circulation pump (21) is used to forcibly pump the concentrated brine in the MVR separator to flow through the heat exchange tube tube in the MVR heater (22) at a high flow rate, so that the saturated steam input from the steam input pipeline into the MVR separator can continuously heat and evaporate all the concentrated brine.

6. A high-concentration wastewater post-membrane concentrated brine full-volume treatment system according to claim 5, characterized in that: The front end pipeline of the MVR circulation pump (21) is connected to an emergency pump (23), and the output end of the emergency pump (23) is connected to an emergency pool (231).

7. A high-concentration wastewater post-membrane concentrated brine full-volume treatment system according to claim 5, characterized in that: The concentrated brine output by the MVR circulation pump (21) passes through the MVR heater (22) before entering the MVR separator; The output point of the sodium hydroxide scrubber (32) is connected to an MVR steam compressor (33), and the output end of the MVR steam compressor (33) is connected to the steam input end of the MVR heater (22), so that the MVR steam compressor (33) heats and heats the steam output from the sodium hydroxide scrubber (32) and inputs the heat to the MVR heater (22), so as to heat the concentrated brine passing through the MVR heater (22). The steam output end of the MVR heater (22) is used to be connected to an exhaust gas treatment system (34), and the exhaust gas treatment system (34) is used to purify the steam output from the MVR heater (22) and discharge it to the outside.

8. A high-concentration wastewater post-membrane concentrated brine full-volume treatment system according to claim 7, characterized in that: The preheating group comprises a first MVR heat exchanger (41), an intermediate temporary storage tank (42), an MVR delivery pump (43) and a second MVR heat exchanger (44) which are sequentially connected by pipelines, so that the concentrated brine output from the clarification tank (15) enters the intermediate temporary storage tank (42) through the first MVR heat exchanger (41), the intermediate temporary storage tank (42) is provided with a pH adjustment module (45) for conditioning the concentrated brine in the intermediate temporary storage tank (42), and the MVR delivery pump (43) is used to extract the concentrated brine in the intermediate temporary storage tank (42) and output it through the second MVR heat exchanger (44) and then input it into the MVR separator for heating and evaporation; The MVR heater (22) is connected to an MVR distilled water tank (46), and the MVR distilled water tank (46) is used to collect the distilled water in the MVR heater (22). The output end of the MVR distilled water tank (46) is connected to an MVR distilled water pump (47), and the MVR distilled water pump (47) outputs the distilled water in the MVR distilled water tank (46) in parallel through the first MVR heat exchanger (41) and the second MVR heat exchanger (44), so that the distilled water passes through the first MVR heat exchanger (41) and the second MVR heat exchanger (44), so that the distilled water passes through the second MVR heat exchanger (44), and the distilled water passes through the second MVR heat exchanger (44). The concentrated brine in the first MVR heat exchanger (41) and the concentrated brine passing through the second MVR heat exchanger (44) are preheated, and the distilled water passes through the first MVR heat exchanger (41) and the second MVR heat exchanger (44) in parallel and flows into a distilled water cooler (48). The distilled water cooler (48) is provided with a circulating cooling water system for thoroughly cooling the distilled water therein. After being cooled in the distilled water cooler (48), the distilled water flows out to a clear water tank (49) for discharge.

9. A high-concentration wastewater post-membrane concentrated brine full-volume treatment system according to claim 8, characterized in that: The resource utilization unit comprises an MVR concentrate pump (51), a cyclone (52) and a two-stage pusher centrifuge (53); The MVR concentrate pump (51), after the concentrated brine is circulated and evaporated into concentrated liquid in the MVR separator, the MVR concentrate pump (51) extracts the concentrated liquid and transports it to the cyclone (52), and the pipeline between the MVR concentrate pump (51) and the cyclone (52) is connected in parallel with a pipeline connected to the MVR separator, so that the remaining concentrated liquid after the MVR concentrate pump (51) transports it to the cyclone (52) flows back to the MVR separator to mix with the concentrated brine for cyclic evaporation; The cyclone (52) is used to perform preliminary solid-liquid separation on the concentrated liquid, the solid matter formed at the bottom of the cyclone (52) is transported to the double-stage pusher centrifuge (53), and the mother liquid on the upper part of the cyclone (52) is transported to the mother liquid drying unit; The two-stage pusher centrifuge (53) is used to reduce the water content of the solids, and finally form crystallized salt crystals to enter the fluidized bed drying system. The output end of the fluidized bed drying system is connected to the crystallized salt packaging module (54). The two-stage pusher centrifuge (53) separates the mother liquor generated by the solids and transports it to the mother liquor drying unit.

10. A high-concentration wastewater post-membrane concentrated brine full-volume treatment system according to claim 9, characterized in that: The mother liquor drying unit comprises an MVR mother liquor tank (61), an MVR mother liquor pump (62), a mother liquor drying module (63) and a sludge packaging module (64); The MVR mother liquid tank (61) is used to receive the mother liquid output by the cyclone (52) and the two-stage pusher centrifuge (53); The MVR mother liquid pump (62) is connected to the MVR mother liquid tank (61) to extract the mother liquid in the MVR mother liquid tank (61) and output it to the mother liquid drying module (63); The mother liquor drying module (63) is provided with a steam system for final evaporation and drying of the input mother liquor, and the liquid produced thereafter is transported back to the MVR separator; The sludge packaging module (64) is connected to the mother liquor drying module (63) and is used to package the sludge formed after evaporation and drying of the mother liquor.

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