CN113697978A - Three-stage reverse osmosis membrane system and process for high-power concentration - Google Patents
Three-stage reverse osmosis membrane system and process for high-power concentration Download PDFInfo
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- CN113697978A CN113697978A CN202110957881.6A CN202110957881A CN113697978A CN 113697978 A CN113697978 A CN 113697978A CN 202110957881 A CN202110957881 A CN 202110957881A CN 113697978 A CN113697978 A CN 113697978A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
A high-power concentrated three-section reverse osmosis membrane system comprises a water inlet pool, a booster pump, a security filter, a high-pressure pump, a high-power reverse osmosis membrane concentration unit, a water production tank and a concentrated water tank which are connected with a water production port and a concentrated water port of the high-power reverse osmosis membrane concentration unit respectively, wherein the high-power reverse osmosis membrane concentration unit is a one-stage three-section reverse osmosis membrane system and comprises a first-section reverse osmosis membrane component A, a second-section reverse osmosis membrane component B and a third-section reverse osmosis membrane component C, and the water permeability coefficient and the salt permeability coefficient of a single membrane element of each section of membrane component are different from each other; and the concentrated water energy of the two-section reverse osmosis membrane component B can be fully utilized, and the energy consumption and the investment are reduced to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a three-section reverse osmosis membrane system with high-power concentration and a process.
Background
With the upgrading and strengthening of water resource utilization and protection policies in China, the high-power concentration and zero-emission technology of wastewater gradually becomes a necessary choice for various industries such as coal chemical industry, electric power, coking, metallurgy, papermaking, printing and dyeing, petrochemical industry and the like, wherein the membrane concentration process is a key core technology in the high-power concentration and zero-emission process of wastewater. Generally, the water produced by the reverse osmosis membrane has good quality and can be recycled; the reverse osmosis concentrated water enters a subsequent treatment unit. The high-power membrane concentration technology for reducing the concentrated water quantity to the maximum extent is one of key factors influencing the overall construction cost of the high-power concentration and zero-discharge engineering of the wastewater and the operation cost.
The conventional reverse osmosis membrane concentration technology adopts a one-stage one-section or one-stage two-section concentration system process, even if an 83bar pressure grade reverse osmosis membrane concentration process is adopted, the highest concentration of sodium chloride solution concentration is only 70000-80000 mg/L. If a higher salt concentration end point is needed, a reverse osmosis membrane with a higher pressure grade of 120Bar is needed, but the reverse osmosis membrane with the higher pressure grade of 120Bar has high energy consumption and engineering cost, and has high operation safety cost and management difficulty. Therefore, how to research and develop a membrane concentration process technology which can improve the wastewater concentration end point without improving the reverse osmosis membrane pressure is the key to be urgently solved for high-power wastewater concentration and zero emission, energy conservation and emission reduction.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a three-stage reverse osmosis membrane system and a process for high-power concentration, which can realize high-power concentration of salt-containing wastewater under the condition of not increasing the water inlet pressure, and compared with the traditional one-stage or one-stage two-stage reverse osmosis membrane concentration system, the concentration end point of a salt solution can be increased by 15-30%, the concentrated water amount can be reduced by 15-30%, and the scale and the operation cost of subsequent treatment equipment can be greatly reduced.
In order to achieve the purpose, the invention adopts the technical scheme that:
a three-section reverse osmosis membrane system with high-power concentration comprises a water inlet pool, a booster pump, a cartridge filter, a high-pressure pump and a high-power reverse osmosis membrane concentration unit which are sequentially connected, and a water producing tank and a concentrated water tank which are respectively connected with the water producing port and the concentrated water port of the high-power reverse osmosis membrane concentration unit, the high-power reverse osmosis membrane concentration unit is a first-stage three-section reverse osmosis membrane system and comprises a first-stage reverse osmosis membrane component A, a second-stage reverse osmosis membrane component B and a third-stage reverse osmosis membrane component C, the water permeability coefficient and the salt permeability coefficient of a single membrane element of each section of membrane component are different, a concentrated water port of the first-stage reverse osmosis membrane component A is connected with a water inlet pipeline of the second-stage reverse osmosis membrane component B through an intersegmental booster pump or directly, a concentrated water port of the second-stage reverse osmosis membrane component B is connected with a water inlet pipeline of the third-stage reverse osmosis membrane component C, and water producing ports of the first-stage reverse osmosis membrane component A and the second-stage reverse osmosis membrane component B are connected with a water producing tank pipeline; the water producing port of the three-section reverse osmosis membrane component C is connected with a water inlet pool or a booster pump front end pipeline, and the concentrated water port of the three-section reverse osmosis membrane component C is connected with a concentrated water tank pipeline.
In one embodiment of the invention, the water permeability coefficients of the single membrane elements of the first section of reverse osmosis membrane module A, the second section of reverse osmosis membrane module B and the third section of reverse osmosis membrane module C are sequentially increased, and the salt permeability coefficients are sequentially increased.
In one embodiment of the invention, the water permeability coefficient of a single membrane element of the first section of reverse osmosis membrane assembly A is 1.1-4.9LMH/bar, and the salt permeability coefficient is less than 0.45 mm/h; the water permeability coefficient of a single membrane element of the two-stage reverse osmosis membrane component B is 1.2-3.1LMH/bar, and the salt permeability coefficient is 0.14-0.32 mm/h; the water permeability coefficient of a single membrane element of the three sections of reverse osmosis membrane assemblies C is larger than 3.2LMH/bar, and the salt permeability coefficient is larger than 4.90 mm/h.
In one embodiment of the invention, whether an intersegment booster pump is arranged between the first section reverse osmosis membrane module A and the second section reverse osmosis membrane module B is related to the recovery rate of a high-power reverse osmosis membrane concentration unit system: when the recovery rate of the high-power reverse osmosis membrane concentration unit system is less than 60%, the interstage booster pump is not arranged, when the recovery rate of the high-power reverse osmosis membrane concentration unit system is greater than 70%, the interstage booster pump is arranged, and when the recovery rate of the high-power reverse osmosis membrane concentration unit system is between 60% and 70%, whether the interstage booster pump is arranged or not is determined according to the salt content and components of incoming water.
In one embodiment of the invention, when the TDS of the incoming water of the high-power reverse osmosis membrane concentration unit is 20000ppm, the system recovery rate is 65%, if the TDS is a sodium chloride system, an intersegment booster pump is arranged, and the booster pressure is 8 bar; if the TDS is a sodium sulfate system, the interstage booster pump is not arranged; when the TDS of the incoming water of the high-power reverse osmosis membrane concentration unit is 30000ppm, the recovery rate of the system is 65%, if the TDS is a sodium chloride system, an intersegmental booster pump is arranged, and the boosting pressure is 12 bar; if TDS is sodium sulfate system, inter-stage booster pump is set, and booster pressure is 7 bar.
In one embodiment of the invention, no interstage booster pump is required between the two stage reverse osmosis membrane module B and the three stage reverse osmosis membrane module C.
In one embodiment of the invention, the booster pump boosts the effluent pressure to the cartridge filter pressure and the high pressure pump provides pressure to the reverse osmosis system.
The invention also provides a process based on the high-power concentrated three-section reverse osmosis membrane system, wastewater to be treated enters a cartridge filter for primary filtration after being pressurized by a booster pump from a water inlet tank, then is sent to the first section of reverse osmosis membrane component A by a high-pressure pump for primary reverse osmosis filtration, the produced water of the first section of reverse osmosis membrane component A is sent to a water production tank, the concentrated water is sent to the second section of reverse osmosis membrane component B for secondary reverse osmosis filtration through the interstage booster pump or directly, the produced water of the second section of reverse osmosis membrane component B is sent to the water production tank, the concentrated water is sent to the third section of reverse osmosis membrane component C for third reverse osmosis filtration, the produced water of the third section of reverse osmosis membrane component C is returned to the water inlet tank or the front end of the booster pump, and the concentrated water is sent to the concentrated water tank.
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with the traditional one-stage or one-stage two-section reverse osmosis membrane concentration system, the salt concentration end point of the traditional high-pressure reverse osmosis membrane concentration system is broken through under the same pressure condition, higher concentration of the salt-containing wastewater can be realized, the salt solution concentration end point can be improved by 15-30%, the concentrated water quantity can be reduced by 15-30%, and the scale and the operation cost of subsequent treatment equipment can be greatly reduced.
(2) In the high-power reverse osmosis membrane concentration unit, an intersegmental booster pump does not need to be arranged between the two sections of reverse osmosis membrane assemblies B and the three sections of reverse osmosis membrane assemblies C, so that the system investment and the energy consumption cost can be reduced, and the production management operation is more convenient.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
FIG. 2 is a schematic diagram of the system of the present invention (without an interstage booster pump).
FIG. 3 is a schematic diagram of the system of the present invention (with an intersegment booster pump).
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1, the present invention provides a three-stage reverse osmosis membrane system with high concentration, which mainly comprises: the device comprises a water inlet pool 1, a booster pump 2, a cartridge filter 3, a high-pressure pump 4, a high-power reverse osmosis membrane concentration unit 5, a water production tank 6 and a concentrated water tank 7. The water inlet pool 1, the booster pump 2, the cartridge filter 3, the high-pressure pump 4 and the high-power reverse osmosis membrane concentration unit 5 are sequentially connected, and the water production tank 6 and the concentrated water tank 7 are respectively connected with the water production port and the concentrated water port of the high-power reverse osmosis membrane concentration unit 5.
Wherein, the intake pool 1 is used for storing or temporarily storing the wastewater to be treated, and can homogenize the water quality and stabilize the water quantity and the water quality of the system. The booster pump 2 is used for raising the outlet water pressure to the pressure of the cartridge filter 3, which is 3bar commonly, and the cartridge filter 3 is generally internally provided with a filter element with the filtering precision of 5 microns so as to protect the high-pressure pump 4 and the reverse osmosis membrane. The main function of the high pressure pump 4 is to overcome the osmotic pressure of the liquid and provide pressure to the reverse osmosis system.
The high-power reverse osmosis membrane concentration unit 5 is a first-stage three-section reverse osmosis membrane system and comprises a first-section reverse osmosis membrane component A51, a second-section reverse osmosis membrane component B52 and a third-section reverse osmosis membrane component C53. Or, the reverse osmosis membrane module only comprises a first reverse osmosis membrane module A51, a second reverse osmosis membrane module B52 and a third reverse osmosis membrane module C53 and connecting pipelines thereof. Wherein, the water permeability coefficient and the salt permeability coefficient of the single membrane element of each membrane component are different. Illustratively, the water permeability of the single membrane element of the first reverse osmosis membrane module a51, the second reverse osmosis membrane module B52 and the third reverse osmosis membrane module C53 is increased in sequence, and the salt permeability is increased in sequence. Further exemplarily, in order to utilize the energy of concentrated water of the front reverse osmosis membrane component to the maximum, the water permeability coefficient of a single membrane element of the first reverse osmosis membrane component A51 is 1.1-4.9LMH/bar, and the salt permeability coefficient is less than 0.45 mm/h; the water permeability coefficient of a single membrane element of the two-stage reverse osmosis membrane component B52 is 1.2-3.1LMH/bar, and the salt permeability coefficient is 0.14-0.32 mm/h; the water permeability coefficient of a single membrane element of the three-section reverse osmosis membrane component C53 is more than 3.2LMH/bar, and the salt permeability coefficient is more than 4.90 mm/h.
The connection relationship is as follows: the concentrated water inlet of the first section of reverse osmosis membrane component A51 is connected with the water inlet pipeline of the second section of reverse osmosis membrane component B52 through the inter-section booster pump 54 or directly, the concentrated water inlet of the second section of reverse osmosis membrane component B52 is connected with the water inlet pipeline of the third section of reverse osmosis membrane component C53, the water outlets of the first section of reverse osmosis membrane component A51 and the second section of reverse osmosis membrane component B52 are connected with the water production tank 6 through pipelines, and the water quality of the first section of reverse osmosis membrane component A51 and the second section of reverse osmosis membrane component B52 is good and can be directly recycled. The water producing ports of the three sections of reverse osmosis membrane assemblies C53 are connected with a pipeline at the front end of the water inlet pool 1 or the booster pump 2, the water producing quality of the three sections of reverse osmosis membrane assemblies C53 is poor, so that the produced water flows back, and the concentrated water ports of the three sections of reverse osmosis membrane assemblies C53 are connected with a pipeline of the concentrated water tank 7.
Whether an intersegment booster pump 54 is arranged between the first section of reverse osmosis membrane component A51 and the second section of reverse osmosis membrane component B52 is related to the system recovery rate of the high-power reverse osmosis membrane concentration unit 5: when the system recovery rate of the high-power reverse osmosis membrane concentration unit 5 is less than 60%, the inter-segment booster pump 54 is not arranged, as shown in fig. 2; when the system recovery rate of the high-power reverse osmosis membrane concentration unit 5 is more than 70%, the inter-stage booster pump 54 is arranged, and as shown in fig. 3, when the system recovery rate of the high-power reverse osmosis membrane concentration unit 5 is between 60% and 70%, whether the inter-stage booster pump 54 is arranged is determined according to the salt content of the incoming water and the components of the incoming water.
In one embodiment of the invention, the TDS of the incoming water of the high-power reverse osmosis membrane concentration unit 5 is 20000ppm, the system recovery rate is 65%, if the TDS is a sodium chloride system, an intersegmental booster pump 54 is needed, and the booster pressure is about 8 bar; if the TDS is a sodium sulfate system, an interstage booster pump 54 is not required. The TDS of the incoming water of the high-power reverse osmosis membrane concentration unit 5 is 30000ppm, the recovery rate of the system is 65%, if the TDS is a sodium chloride system, an intersegmental booster pump 54 is needed, and the boosting pressure is about 12 bar; if the TDS is a sodium sulfate system, an interstage booster pump 54 is required, with a boost pressure of about 7 bar.
Illustratively, no interstage booster pump 54 is required between the two stage reverse osmosis membrane module B52 and the three stage reverse osmosis membrane module C53. The transmission requirement can be met only by utilizing the concentrated water energy of the two-stage reverse osmosis membrane module B52, thereby reducing the energy consumption and investment to the maximum extent.
The process of the invention comprises the following steps: the wastewater to be treated enters a cartridge filter 3 for primary filtration after being pressurized by a booster pump 2 from a water inlet tank 1, then is sent to a first section of reverse osmosis membrane component A51 by a high-pressure pump 4 for primary reverse osmosis filtration, the produced water of a first section of reverse osmosis membrane component A51 is sent to a water production tank 6, the concentrated water is sent to a second section of reverse osmosis membrane component B52 by an intersegmental booster pump 54 or directly sent to the second section of reverse osmosis membrane component B52 for secondary reverse osmosis filtration, the produced water of the second section of reverse osmosis membrane component B52 is sent to the water production tank 6, the concentrated water is sent to a third section of reverse osmosis membrane component C53 for third reverse osmosis filtration, the produced water of the third section of reverse osmosis membrane component C53 is sent back to the water inlet tank 1 or the front end of the booster pump 2, and the concentrated water is sent to a concentrated reverse osmosis membrane tank 7.
The following are several specific embodiments of the invention.
Example 1:
as shown in FIG. 2, in this embodiment, the incoming TDS of the high-power reverse osmosis membrane concentration unit 5 is 47765mg/L, and the FORTILIFE of DuPont, USA is selected as the first-stage reverse osmosis membrane module A51TMXC70, FORTILIFE from DuPont USA is selected as the two-stage reverse osmosis membrane component B52TMXC80, and the three-stage reverse osmosis membrane component C53 is FORTILIFE from DuPont, USATMXC120, the performance parameters of membrane elements of each section are shown in Table 1, the arrangement mode of membrane shells is 8:5:4(6 cores are arranged), the system recovery rate of the high-power reverse osmosis membrane concentration unit 5 is 53.0 percent, an intersegmental booster pump 54 is not arranged between the first section and the second section, the maximum operation pressure of the system is 57.3BarThe maximum operation pressure of the primary two-section reverse osmosis membrane concentration system is 67.2 Bar. The operation pressure of the system is 14.7 percent lower than that of a conventional one-stage two-section reverse osmosis membrane concentration system by adopting a three-section reverse osmosis membrane system process with high concentration (the calculation formula is that 1- (57.3/67.2) ═ 14.7 percent).
Example 2:
as shown in FIG. 3, in this embodiment, the incoming TDS of the high-power reverse osmosis membrane concentration unit 5 is 47765mg/L, and the FORTILIFE of DuPont, USA is selected as the first-stage reverse osmosis membrane module A51TMXC70, FORTILIFE from DuPont USA is selected as the two-stage reverse osmosis membrane component B52TMXC80, and the three-stage reverse osmosis membrane component C53 is FORTILIFE from DuPont, USATMXC120, the performance parameters of membrane elements of each section are shown in Table 1, the arrangement mode of membrane shells is 9:7:5(6 cores are arranged), the system recovery rate of the high-power reverse osmosis membrane concentration unit 5 is 65.0 percent, an intersegmental booster pump 54 is arranged between the first section and the second section, the booster pressure is 3Bar, the maximum operation pressure of the system is 74.4Bar, and the maximum operation pressure of a conventional one-stage two-section reverse osmosis membrane concentration system is 91.6 Bar. The operation pressure of the system is 18.8 percent lower than that of the conventional one-stage two-section reverse osmosis membrane concentration system (the calculation formula is 1- (74.4/91.6) ═ 18.8 percent).
TABLE 1 Performance parameters of membrane elements in each section
Therefore, under the same pressure condition, the salt concentration end point of the traditional high-pressure reverse osmosis membrane concentration system is broken through, the salt content of the strong brine is improved by 15-30%, the water content of the strong brine is correspondingly reduced by 15-30%, the salt-containing wastewater can be concentrated by a higher time, and the scale of subsequent treatment equipment is reduced.
Taking a sodium chloride system as an example, the TDS of the inlet water is 30000ppm, and the inlet water amount is50m3The water inlet pressure is 70 bar. The concentrated water TDS of the conventional one-stage two-section reverse osmosis membrane concentration system is 79852ppm, and the water content of the concentrated salt is 18.7m3H; the TDS of the concentrated water of the high power reverse osmosis membrane concentration unit 5 is 96965ppm, and the water quantity of the concentrated salt is 14.8m3H is used as the reference value. The TDS of the concentrated water is improved by 21.4 percent, and the water quantity of the concentrated salt is reduced by 20.8 percent.
Claims (8)
1. A three-section reverse osmosis membrane system with high-power concentration comprises a water inlet pool, a booster pump, a cartridge filter, a high-pressure pump and a high-power reverse osmosis membrane concentration unit which are sequentially connected, and a water producing tank and a concentrated water tank which are respectively connected with the water producing port and the concentrated water port of the high-power reverse osmosis membrane concentration unit, the high-power reverse osmosis membrane concentration unit is a first-stage three-section reverse osmosis membrane system and comprises a first-section reverse osmosis membrane component A, a second-section reverse osmosis membrane component B and a third-section reverse osmosis membrane component C, the water permeability coefficient and the salt permeability coefficient of a single membrane element of each section of membrane component are different, a concentrated water port of the first-section reverse osmosis membrane component A is connected with a water inlet pipeline of the second-section reverse osmosis membrane component B through an intersegment booster pump or directly, a concentrated water port of the second-section reverse osmosis membrane component B is connected with a water inlet pipeline of the third-section reverse osmosis membrane component C, and water producing ports of the first-section reverse osmosis membrane component A and the second-section reverse osmosis membrane component B are connected with a water producing tank pipeline; the water producing port of the three-section reverse osmosis membrane component C is connected with a water inlet pool or a booster pump front end pipeline, and the concentrated water port of the three-section reverse osmosis membrane component C is connected with a concentrated water tank pipeline.
2. The three-stage reverse osmosis membrane system for high power concentration according to claim 1, wherein the water permeability of the single membrane element of the first stage reverse osmosis membrane module a, the second stage reverse osmosis membrane module B and the third stage reverse osmosis membrane module C is sequentially increased, and the salt permeability is sequentially increased.
3. The three-stage reverse osmosis membrane system for high power concentration according to claim 1, wherein the water permeability coefficient of a single membrane element of the one-stage reverse osmosis membrane module a is 1.1-4.9LMH/bar, and the salt permeability coefficient is less than 0.45 mm/h; the water permeability coefficient of a single membrane element of the two-stage reverse osmosis membrane component B is 1.2-3.1LMH/bar, and the salt permeability coefficient is 0.14-0.32 mm/h; the water permeability coefficient of a single membrane element of the three sections of reverse osmosis membrane assemblies C is larger than 3.2LMH/bar, and the salt permeability coefficient is larger than 4.90 mm/h.
4. The three-stage reverse osmosis membrane system for high power concentration according to claim 1, wherein whether an interstage booster pump is provided between the first stage reverse osmosis membrane module a and the second stage reverse osmosis membrane module B is related to the recovery rate of the high power reverse osmosis membrane concentration unit system: when the recovery rate of the high-power reverse osmosis membrane concentration unit system is less than 60%, the interstage booster pump is not arranged, when the recovery rate of the high-power reverse osmosis membrane concentration unit system is greater than 70%, the interstage booster pump is arranged, and when the recovery rate of the high-power reverse osmosis membrane concentration unit system is between 60% and 70%, whether the interstage booster pump is arranged or not is determined according to the salt content and components of incoming water.
5. The three-stage reverse osmosis membrane system for high power concentration according to claim 4, wherein when the TDS of the incoming water of the high power reverse osmosis membrane concentration unit is 20000ppm, the system recovery rate is 65%, if the TDS is a sodium chloride system, an interstage booster pump is provided, and the booster pressure is 8 bar; if the TDS is a sodium sulfate system, the interstage booster pump is not arranged; when the TDS of the incoming water of the high-power reverse osmosis membrane concentration unit is 30000ppm, the recovery rate of the system is 65%, if the TDS is a sodium chloride system, an intersegmental booster pump is arranged, and the boosting pressure is 12 bar; if TDS is sodium sulfate system, inter-stage booster pump is set, and booster pressure is 7 bar.
6. The three-stage reverse osmosis membrane system for high power concentration of claim 1, wherein an interstage booster pump is not required between the two stage reverse osmosis membrane module B and the three stage reverse osmosis membrane module C.
7. The three-stage high-concentration reverse osmosis membrane system of claim 1, wherein the booster pump boosts the effluent pressure to a cartridge filter pressure and the high pressure pump provides pressure to the reverse osmosis system.
8. The process of the three-stage reverse osmosis membrane system for high power concentration as claimed in claim 1, wherein the wastewater to be treated is pressurized by a booster pump from the water inlet tank, enters a cartridge filter for preliminary filtration, is then sent to the first stage reverse osmosis membrane module A by a high pressure pump for first reverse osmosis filtration, the produced water from the first stage reverse osmosis membrane module A is sent to the produced water tank, the concentrated water passes through the interstage booster pump or is directly sent to the second stage reverse osmosis membrane module B for second reverse osmosis filtration, the produced water from the second stage reverse osmosis membrane module B is sent to the produced water tank, the concentrated water is directly sent to the third stage reverse osmosis membrane module C for third reverse osmosis filtration, the produced water from the third stage reverse osmosis membrane module C is returned to the water inlet tank or the front end of the booster pump, and the concentrated water is sent to the concentrated water tank.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114314878A (en) * | 2021-12-13 | 2022-04-12 | 中芯恒润环境科技(北京)有限公司 | Water treatment system by reverse osmosis membrane method |
| CN114538476A (en) * | 2022-03-17 | 2022-05-27 | 吉林海资生物工程技术有限公司 | Separation and purification technology for potassium sulfate extract |
| CN114538476B (en) * | 2022-03-17 | 2024-06-07 | 吉林海资生物工程技术有限公司 | Separation and purification technology of potassium sulfate extract |
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2021
- 2021-08-20 CN CN202110957881.6A patent/CN113697978A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114314878A (en) * | 2021-12-13 | 2022-04-12 | 中芯恒润环境科技(北京)有限公司 | Water treatment system by reverse osmosis membrane method |
| CN114538476A (en) * | 2022-03-17 | 2022-05-27 | 吉林海资生物工程技术有限公司 | Separation and purification technology for potassium sulfate extract |
| CN114538476B (en) * | 2022-03-17 | 2024-06-07 | 吉林海资生物工程技术有限公司 | Separation and purification technology of potassium sulfate extract |
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