Mixed strong brine or mixed carnallite separation and medicament recycling system

Abstract

The utility model relates to a mixed strong brine or mixed carnallite separation and medicament recycling system which comprises an adjusting tank, a pretreatment assembly, a nanofiltration membrane device, a sodium chloride strong brine tank, a sodium carbonate strong brine tank and a dosing system, the water production end and the concentrated water end of the nanofiltration membrane device are respectively communicated with the input end of the sodium chloride concentrated brine tank and the input end of the sodium carbonate concentrated brine tank, and the output end of the sodium carbonate concentrated brine tank is communicated with the input end of the dosing system. The utility model relates to the technical field of water treatment. After mixed strong brine or mixed carnallite passes through the nanofiltration membrane device, the separation of monovalent salt and divalent salt is realized, and the resource utilization rate is improved. Meanwhile, a part of the generated sodium carbonate solution enters the dosing system and is used as a softening agent in the pretreatment assembly, so that the outsourcing cost of the agent is reduced, and the water treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a system for separating mixed concentrated brine or mixed impure salts and recycling medicaments. Background Art

[0002] At present, in the zero-emission projects of the water treatment industry, the common treatment method for mixed brine (mixed brine of high sodium chloride and sodium carbonate) is evaporation and crystallization. The mixed brine directly enters the evaporation system for treatment. Through the heat energy provided by the steam, the salt in the mixed brine reaches an oversaturated state and crystallizes out miscellaneous salts (crystalline salts of mixed sodium chloride and sodium carbonate). The mixed miscellaneous salts have no utilization value and need to be entrusted to qualified units for treatment according to hazardous waste standards, which will not only cause a large amount of resource waste, but also require related treatment costs, and have low economic benefits.

[0003] The Chinese patent with publication number CN217868377U discloses a system for separating and treating mixed wastewater containing high sodium chloride and sodium nitrate, specifically involving a process in which a selective permeable membrane device is used to separate concentrated brine containing sodium chloride and sodium nitrate, so as to solve the problem that the treatment method of monovalent concentrated brine with zero wastewater discharge is single and cannot be recycled in a targeted manner, and realize the resource utilization of miscellaneous salts. However, the process does not involve the separation of monovalent and divalent salts in wastewater and the recycling of reagents.

[0004] Based on this, the utility model proposes a mixed concentrated brine or mixed miscellaneous salt separation and reagent recovery and utilization system. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a mixed concentrated brine or mixed impure salt separation and reagent recycling system to solve the technical problems mentioned in the above background technology.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A mixed brine or mixed salt separation and reagent recycling system comprises a regulating tank, a pretreatment component, a nanofiltration membrane device, a sodium chloride brine pool, a sodium carbonate brine pool and a dosing system, wherein the pretreatment component is located between the output end of the regulating tank and the input end of the nanofiltration membrane device, the water production end and the concentrated water end of the nanofiltration membrane device are respectively connected to the sodium chloride brine pool and the sodium carbonate brine pool, and the output end of the sodium carbonate brine pool is connected to the input end of the dosing system.

[0008] By adopting the above technical solution, after the brine mixed with concentrated brine or mixed salt (mixed crystal salt of sodium chloride and sodium carbonate) passes through the nanofiltration membrane device, the Cl in the concentrated brine is -Through a specific nanofiltration membrane into the sodium chloride brine pool, and divalent CO3 2- After being effectively intercepted by a specific nanofiltration membrane, it enters the sodium carbonate brine pool, thereby achieving the separation of monovalent and divalent salts and improving resource utilization. At the same time, part of the sodium carbonate solution produced enters the dosing system and is used as a softening agent in the pretreatment component, reducing the cost of purchasing agents and reducing water treatment costs.

[0009] In a preferred example, the utility model can be further configured as follows: the pretreatment component includes a high-density tank, the input end of the high-density tank is connected to the output end of the regulating tank, a softening agent is added to the high-density tank, and the output end of the dosing system is connected to the inside of the high-density tank.

[0010] By adopting the above technical solution, the high-density pool can soften the concentrated brine, thereby reducing the damage of the concentrated brine to the water treatment system. At the same time, part of the sodium carbonate solution will enter the high-density pool through the dosing system to act as a softening agent, reducing the cost of water softening.

[0011] In a preferred example, the utility model can be further configured as follows: the pretreatment component also includes a filter, an ion exchanger and a decarbonizer, the filter input end is connected to the output end of the high-density pool through a pipeline, the filter output end is connected to the input end of the ion exchanger through a pipeline, the ion exchanger output end is connected to the input end of the decarbonizer through a pipeline, and the decarbonizer output end is connected to the input end of the nanofiltration membrane device through a pipeline.

[0012] By adopting the above technical solution, the effluent from the high-density pool enters the filter for filtration to remove suspended matter and colloids in the water, and then passes through the ion exchanger to remove most of the remaining hardness in the water. The ion exchange effluent passes through the decarbonizer to remove part of the alkalinity, greatly reducing the degree of scaling.

[0013] In a preferred example, the utility model can be further configured as follows: the sodium carbonate concentrated brine pool is provided with two output ends, one of which is connected to the input end of the dosing system, and the other is connected to a sodium carbonate evaporation and crystallization system.

[0014] By adopting the above technical scheme, most of the sodium carbonate solution enters the sodium carbonate evaporation and crystallization system for evaporation, crystallization and drying to obtain sodium carbonate solid salt, which can be supplied to the nearby near-zero emission projects as a softening agent for pretreatment components, thereby greatly reducing the cost of adding medicine, improving resource utilization, responding to the call for energy conservation and emission reduction, and truly achieving cost reduction and efficiency improvement.

[0015] In a preferred example, the utility model can be further configured as follows: the output end of the sodium chloride concentrated brine pool is connected to a sodium chloride evaporation and crystallization system.

[0016] By adopting the above technical solution, the sodium chloride solution enters the sodium chloride evaporation crystallization system to obtain sodium chloride solid salt, which is convenient for transportation.

[0017] In a preferred example, the utility model can be further configured as follows: the peripheral sides of the output ends of the regulating tank, the high-density tank, the decarbonizer, the sodium chloride concentrated brine tank and the sodium carbonate concentrated brine tank are all fixedly connected with a lifting pump.

[0018] By adopting the above technical solution, each lifting pump works together to ensure that the concentrated brine can flow stably in the system, and can control the flow rate of the concentrated brine to enable the water treatment system to achieve the best treatment effect.

[0019] In summary, the present invention includes at least one of the following beneficial technical effects:

[0020] 1. A mixed brine or mixed salt separation and reagent recycling system, after the mixed brine or mixed salt (mixed sodium chloride, sodium carbonate crystal salt) passes through the nanofiltration membrane device, the Cl - Through a specific nanofiltration membrane into the sodium chloride brine pool, and divalent CO3 2- After being effectively intercepted by a specific nanofiltration membrane, it enters the sodium carbonate brine pool, thereby achieving the separation of monovalent and divalent salts and improving resource utilization. Part of the generated sodium carbonate solution enters the dosing system and then enters the high-density pool through the dosing system to be used as a softening agent in the high-density pool, reducing the cost of purchasing agents and reducing water treatment costs;

[0021] 2. This is a mixed concentrated brine or mixed salt separation and reagent recycling system. The effluent from the high-density pool enters the filter for filtration to remove suspended matter and colloids in the water, and then passes through the ion exchanger to remove most of the hardness remaining in the water. The ion exchange effluent passes through the decarbonizer to remove part of the alkalinity, which greatly reduces the degree of scaling in the system;

[0022] 3. Most of the sodium carbonate solution enters the sodium carbonate evaporation and crystallization system for evaporation, crystallization and drying to obtain sodium carbonate solid salt, which can be supplied to the nearby near-zero emission projects as a softening agent for pretreatment components, thereby greatly reducing the cost of adding drugs, improving resource utilization, responding to the call for energy conservation and emission reduction, and truly achieving cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a system flow chart of a mixed concentrated brine or mixed miscellaneous salt separation and reagent recycling system of this embodiment.

[0025] In the figure, 1. regulating tank; 2. pretreatment component; 21. high-density tank; 22. filter; 23. ion exchanger; 24. decarbonizer; 3. nanofiltration membrane device; 4. sodium chloride concentrated brine tank; 5. sodium carbonate concentrated brine tank; 6. dosing system; 7. sodium carbonate evaporation and crystallization system; 8. sodium chloride evaporation and crystallization system; 9. lifting pump. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings. Example 1

[0027] Reference Figure 1 The utility model discloses a mixed concentrated brine or mixed salt separation and reagent recycling system, comprising a regulating tank 1, a pretreatment component 2, a nanofiltration membrane device 3, a sodium chloride concentrated brine tank 4, a sodium carbonate concentrated brine tank 5 and a dosing system 6. The pretreatment component 2 is located between the output end of the regulating tank 1 and the input end of the nanofiltration membrane device 3.

[0028] The water production end and the concentrated water end of the nanofiltration membrane device 3 are respectively connected to the input end of the sodium chloride concentrated brine pool 4 and the input end of the sodium carbonate concentrated brine pool 5, and the output end of the sodium carbonate concentrated brine pool 5 is connected to the input end of the dosing system 6.

[0029] In this embodiment, the brine of mixed concentrated brine of high sodium chloride and sodium carbonate or mixed salt (crystalline salt of mixed sodium chloride and sodium carbonate) enters the regulating tank 1 through the input end of the regulating tank 1. The regulating tank 1 homogenizes and equalizes the concentrated brine so that the concentrated brine flows stably to the pretreatment component 2. After passing through the pretreatment component 2, the concentrated brine enters the nanofiltration membrane device 3. The Cl- in the concentrated brine directly passes through the nanofiltration membrane and enters the sodium chloride concentrated brine pool 4 through the water production end, while the divalent CO3 2- After being effectively intercepted by the nanofiltration membrane, it enters the sodium carbonate brine pool 5 through the concentrated water end. A portion of the sodium carbonate solution in the sodium carbonate brine pool enters the dosing system 6, and the pretreatment component 2 is dosed through the dosing system 6, reducing the cost of purchasing chemicals and reducing the cost of water treatment.

[0030] The dosing system 6 is a prior art, which is a complete set of equipment integrating dosing, stirring, liquid conveying and automatic control, and will not be described in detail here.

[0031] In a further preferred embodiment of the present invention, Figure 1 As shown, the pretreatment component 2 includes a high-density tank 21 , the input end of the high-density tank 21 is connected to the output end of the regulating tank 1 , a softening agent is added into the high-density tank 21 , and the output end of the dosing system 6 is connected to the inside of the high-density tank 21 .

[0032] In this embodiment, the high-density tank 21 is a device for treating suspended matter in sewage, mainly used to precipitate suspended matter in sewage so that the concentration of the precipitate reaches the required level for further treatment or discharge. Softening agents include lime, sodium carbonate, sodium hydroxide, flocculants, coagulants, etc., which are used to soften water quality and improve the effect of suspended matter precipitation.

[0033] The concentrated brine in the regulating tank 1 enters the high-density tank 21 for impurity removal and softening. The dosing system 6 transports part of the sodium carbonate solution to the high-density tank 21 as a softening agent in the high-density tank 21, reducing the cost of purchasing agents.

[0034] In a further preferred embodiment of the present invention, Figure 1 As shown, the pretreatment component 2 also includes a filter 22, an ion exchanger 23 and a decarbonizer 24. The input end of the filter 22 is connected to the output end of the high-density pool 21 through a pipeline, the output end of the filter 22 is connected to the input end of the ion exchanger 23 through a pipeline, the output end of the ion exchanger 23 is connected to the input end of the decarbonizer 24 through a pipeline, and the output end of the decarbonizer 24 is connected to the input end of the nanofiltration membrane device 3 through a pipeline.

[0035] In this embodiment, the effluent from the high-density tank 21 enters the filter 22 for filtration to remove suspended matter and colloids in the water, and then passes through the ion exchanger 23 to remove most of the hardness remaining in the water. The ion exchange effluent passes through the decarbonizer 24 to remove part of the alkalinity, which greatly reduces the degree of scaling of the concentrated brine in the system.

[0036] In a further preferred embodiment of the present invention, Figure 1 As shown, the sodium carbonate concentrated brine pool 5 is provided with two output ends, one of which is connected to the input end of the dosing system 6, and the other is connected to the sodium carbonate evaporation crystallization system 7.

[0037] In this embodiment, most of the sodium carbonate solution enters the sodium carbonate evaporation and crystallization system 7 for evaporation, crystallization, and drying to obtain sodium carbonate solid salt, which can be supplied to the near-zero emission projects in nearby areas as a softening agent for the pretreatment component 2, thereby greatly reducing the cost of adding medicine, improving resource utilization, responding to the call for energy conservation and emission reduction, and truly achieving cost reduction and efficiency improvement.

[0038] In a further preferred embodiment of the present invention, Figure 1 As shown, the output end of the sodium chloride concentrated brine pool 4 is connected to a sodium chloride evaporation and crystallization system 8.

[0039] In this embodiment, the sodium chloride solution in the sodium chloride concentrated brine pool 4 enters the sodium chloride evaporation crystallization system 8 for evaporation, crystallization, and drying to obtain sodium chloride solid salt, which is convenient for transportation.

[0040] In a further preferred embodiment of the present invention, Figure 1 As shown, the peripheral sides of the output ends of the regulating tank 1, the high-density tank 21, the decarbonizer 24, the sodium chloride concentrated brine tank 4 and the sodium carbonate concentrated brine tank 5 are all fixedly connected with a lift pump 9.

[0041] In this embodiment, the lifting pumps 9 work together to ensure that the concentrated brine can flow stably in the system, and can control the flow rate of the concentrated brine to enable the water treatment system to achieve the best treatment effect.

[0042] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A system for separating mixed concentrated brine or mixed miscellaneous salts and recycling reagents, characterized in that: The invention comprises a regulating tank (1), a pretreatment component (2), a nanofiltration membrane device (3), a sodium chloride concentrated brine tank (4), a sodium carbonate concentrated brine tank (5) and a dosing system (6), wherein the pretreatment component (2) is located between the output end of the regulating tank (1) and the input end of the nanofiltration membrane device (3), the water production end and the concentrated water end of the nanofiltration membrane device (3) are respectively connected to the input end of the sodium chloride concentrated brine tank (4) and the input end of the sodium carbonate concentrated brine tank (5), and the output end of the sodium carbonate concentrated brine tank (5) is connected to the input end of the dosing system (6).

2. A system for separating concentrated brine or mixed salts and recycling reagents according to claim 1, characterized in that: The pretreatment component (2) comprises a high-density tank (21), the input end of the high-density tank (21) is connected to the output end of the regulating tank (1), a softening agent is added to the high-density tank (21), and the output end of the dosing system (6) is connected to the inside of the high-density tank (21).

3. A system for separating a mixed concentrated brine or a mixed impurity salt and recycling a reagent according to claim 2, characterized in that: The pretreatment component (2) further comprises a filter (22), an ion exchanger (23) and a decarbonizer (24); the input end of the filter (22) is connected to the output end of the high-density pool (21) via a pipeline; the output end of the filter (22) is connected to the input end of the ion exchanger (23) via a pipeline; the output end of the ion exchanger (23) is connected to the input end of the decarbonizer (24) via a pipeline; and the output end of the decarbonizer (24) is connected to the input end of the nanofiltration membrane device (3) via a pipeline.

4. A system for separating a mixed concentrated brine or a mixed impurity salt and recycling a reagent according to claim 1, characterized in that: The sodium carbonate concentrated brine pool (5) is provided with two output ends, one of which is connected to the input end of the dosing system (6), and the other is connected to the sodium carbonate evaporation crystallization system (7).

5. A system for separating mixed concentrated brine or mixed impurity salts and recycling reagents according to claim 1, characterized in that: The output end of the sodium chloride concentrated brine pool (4) is connected to a sodium chloride evaporation and crystallization system (8).

6. A system for separating mixed concentrated brine or mixed impurity salts and recycling reagents according to claim 5, characterized in that: The peripheral sides of the output ends of the regulating tank (1), the high-density tank (21), the decarbonizer (24), the sodium chloride concentrated brine tank (4) and the sodium carbonate concentrated brine tank (5) are all fixedly connected to a lifting pump (9).

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