CN114853194A - Multi-stage adjustable nanofiltration system and salt separation process application - Google Patents
Multi-stage adjustable nanofiltration system and salt separation process application Download PDFInfo
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- CN114853194A CN114853194A CN202210513332.4A CN202210513332A CN114853194A CN 114853194 A CN114853194 A CN 114853194A CN 202210513332 A CN202210513332 A CN 202210513332A CN 114853194 A CN114853194 A CN 114853194A
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- nanofiltration
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The invention relates to a multistage adjustable nanofiltration system which comprises a raw water tank, a high-pressure pump, an activated carbon filter, a precision filter and a nanofiltration assembly, wherein the raw water tank, the high-pressure pump, the activated carbon filter, the precision filter and the nanofiltration assembly are sequentially connected in series, the nanofiltration assembly comprises at least four membrane elements which are connected in series, and produced water and concentrated water of an upper membrane element enter a lower membrane element. The invention has scientific and reasonable design, provides the self-designed nanofiltration operation system, treats the high-salinity wastewater by using the system, optimizes the process parameters and realizes the high-efficiency nanofiltration separation of the high-salinity wastewater. The nanofiltration salt separation system has the membrane flux of 20LHM, the temperature of 20 ℃, the recovery rate of 70 percent and the mixed salt ratio of 9:1, the optimal salt separation effect is achieved under the operation condition of 1, and the mass concentration of the sodium chloride on the water production side reaches 99.51 percent.
Description
Technical Field
The invention belongs to the field of wastewater treatment, relates to a high-salinity wastewater treatment technology, and particularly relates to a multistage adjustable nanofiltration system and a salt separation process application.
Background
With the increasing use amount of fresh water and the increasing shortage of fresh water resources in China, the national environmental protection department puts forward strict zero emission requirements on various chemical industries in recent years by combining the current situations of high water consumption and high pollution of various chemical industries. For realizing the 'zero emission' target of the high-salinity wastewater, firstly, salt water separation is carried out, but if various inorganic salts in the high-salinity wastewater cannot be separated, mixed salt crystals containing various ions can be obtained finally through evaporation crystallization treatment, crystallized mixed salt is used as dangerous waste solids, the treatment cost is very high, strong corrosivity is brought to a solidified material, and serious environmental safety hazards are caused. In order to minimize the potential safety hazard of the environment and maximize the economic benefit, the high-salinity wastewater must be effectively treated, and the process goes to recycling, economy and high efficiency along with the progress of treatment technology.
The nanofiltration membrane is used for treating the high-salinity wastewater, so that multivalent salt and monovalent salt can be effectively separated, the utilization rate of resources is effectively improved, and the problem of environmental pollution is reduced. However, most of the nanofiltration membrane salt separation technologies in the prior art adopt a single membrane, and the efficiency is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an independently designed nanofiltration operation system, and the system is used for realizing high-efficiency nanofiltration separation of high-salinity wastewater.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a multi-stage adjustable nanofiltration system comprises a raw water tank, a high-pressure pump, an active carbon filter, a precision filter and a nanofiltration assembly, wherein the devices are sequentially connected in series, the nanofiltration assembly comprises at least four membrane elements which are connected in series, and the produced water and the concentrated water of the upper membrane element enter the lower membrane element.
The multistage adjustable nanofiltration system is applied to high-salinity wastewater treatment, and the system operation conditions are as follows: the average membrane flux of the system is 14-26LHM, the water inlet temperature is 10-30 ℃, the water inlet concentration is 2-10g/L, the recovery rate of the system is maintained at 70 percent, and the raw material liquid is as follows: NaCl: na (Na) 2 SO 4 ＝1-9：9-1
The specific high-salinity wastewater treatment process comprises the following steps:
firstly, preparing raw material liquid according to different requirements of tests at each stage, dissolving test medicines weighed once or for many times in a big beaker, and continuously stirring until the solution is clear and has no obvious precipitated particulate matters by visual inspection; secondly, transferring the electrolyte concentrated solution preliminarily dissolved in the large beaker to a 150L raw water tank, flushing the large beaker for at least three times by adopting a dispensing solvent with the same mass, and keeping constant volume to 150L while injecting the dispensing solvent into the raw water barrel; then, the prepared electrolyte solution is conveyed to nanofiltration equipment through an activated carbon filter and a precision filter by a high-pressure variable frequency pump, and under the drive of high pressure, raw material liquid flows into the roll-type nanofiltration membrane element through a pressure gauge in front of the membrane to start the electrolyte separation process; finally, the electrolyte solution in the raw water tank flows through a concentrated solution of the concentrated water pipeline sequentially through a membrane concentrated water pressure gauge, a concentrated water valve and a concentrated water flowmeter, and the permeate liquid flowing through the water production pipeline flows through the water production flowmeter.
The concentrated solution and the penetrating fluid respectively flow back to the raw water tank to keep the quantity and concentration of the material of the test material liquid constant and reduce the influence of test errors caused by the change of the raw water concentration.
The invention has the advantages and positive effects that:
the invention has scientific and reasonable design, provides the self-designed nanofiltration operation system, treats the high-salinity wastewater by using the system, optimizes the process parameters and realizes the high-efficiency nanofiltration separation of the high-salinity wastewater. The nanofiltration salt separation system has the membrane flux of 20LHM, the temperature of 20 ℃, the recovery rate of 70 percent and the mixed salt ratio of 9:1, the optimal salt separation effect is achieved under the operation condition of 1, and the mass concentration of the sodium chloride on the water production side reaches 99.51 percent.
Drawings
FIG. 1 is a flow diagram of a nanofiltration system according to the present invention;
FIG. 2 is a flow diagram of the nanofiltration membrane module operation;
FIG. 3 is a graph showing the results of changes in the effect of membrane flux changes on salt splitting in an example of the present invention;
FIG. 4 is a graph showing the results of changes in the effect of feed water temperature on salt splitting according to the embodiment of the present invention;
FIG. 5 is a graph showing the results of changes in the effect of feed water concentration on salt concentration in the examples of the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
A multi-stage adjustable nanofiltration system is shown in figure 1 and comprises a raw water tank, a high-pressure pump, an activated carbon filter, a precision filter and a nanofiltration assembly which are sequentially connected in series, as shown in figure 2, the nanofiltration assembly comprises at least four membrane elements which are connected in series, and produced water and concentrated water of the last membrane element enter the next membrane element and finally flow out from the tail end of the system respectively.
In this embodiment, experiments of various process parameters including membrane flux, inlet water temperature and inlet water concentration are performed on the multistage adjustable nanofiltration system of the present application, as shown in fig. 3, when the system is operated under the conditions of inlet water temperature of 20 ℃, inlet water concentration of 6g/L and recovery rate of 70%, the membrane flux of the system is changed to 14, 17, 20, 23 and 26LHM under different salt mixing ratios, and the mass concentration of sodium chloride on the water production side is changed to obtain a result.
The increase of the membrane flux means the increase of the system pressure, the increase of the pressure promotes the mass transfer process of ions in the nanofiltration membrane, so that the ion concentration on the water production side is increased, and the ion concentration on NaCl and Na 2 SO 4 In the mixed salt solution system, as the radius of chloride ions is smaller than that of sulfate ions, and for the negatively charged nanofiltration membrane, the negative charges on the surface of the membrane can generate water electrostatic repulsion on the anions in the solution, theoretically, SO 4 2- The number of charges is Cl - Twice of that of the nanofiltration membrane pair SO of negative charge 4 2- Has higher electrostatic repulsion than Cl - So Cl - Permeate the nanofiltration membrane more easily and reach the product water side for the improvement of product water side NaCl mass concentration, product water side NaCl mass concentration accounts for at NaCl: na (Na) 2 SO 4 1:9, minimum 96.52% at 30 ℃, NaCl: na (Na) 2 SO 4 The concentration ratio of NaCl on the water production side by mass is increased along with the average membrane flux of the system, wherein the concentration ratio is 9:1 and is up to 99.57% at 10 ℃.
As shown in figure 4, the system changes the system inlet water temperature of 10, 15, 20, 25 and 30 ℃ under the operating conditions of 20LHM of membrane flux, 6g/L of inlet water concentration and 70% of recovery rate under different salt mixing ratios, and the mass concentration of sodium chloride on the water production side changes into the result.
Raising the temperature to make SO in the solution 4 2- And Cl - The transmittance is increased, so that NaCl and Na 2 SO 4 The concentration is increased on the water production side, the change of the temperature influences the change of the membrane structure, the increase of the temperature can increase the diameter of the membrane pore, and the change leads to SO with larger ionic radius 4 2- The resistance in the mass transfer process of the nanofiltration membrane is reduced, and more SO is generated 4 2- Entering a water producing side, so that the NaCl mass concentration ratio of the water producing side is reduced, and the NaCl mass concentration ratio of the water producing side is in a NaCl: na (Na) 2 SO 4 1:9, minimum 93.45% at 30 ℃, NaCl: na (Na) 2 SO 4 The concentration ratio of NaCl on the water production side is reduced along with the increase of the water inlet temperature of the system, wherein the concentration ratio is 9:1 and is up to 99.51% at 10 ℃.
As shown in figure 5, the system changes the system inlet water concentration of 2, 4, 6, 8 and 10g/L and the sodium chloride mass concentration of the water producing side to result under the operating conditions of membrane flux of 20LHM, inlet water temperature of 20 ℃ and recovery rate of 70% under different mixed salt proportions.
The key reason that the NaCl mass concentration ratio of the water production side shows a downward trend change along with the increase of the water inlet concentration of the system is probably that the electrostatic interaction between ions and the membrane surface changes due to the change of the solution concentration. Meanwhile, the concentration of the salt mixed solution is improved, so that the concentration gradient between the nanofiltration water production side and the water inlet side is increased, the transmission effect of ions in the nanofiltration membrane is promoted, and more ions pass through the nanofiltration membrane and enter the water production side. The mass concentration of NaCl on the water production side is in the ratio of NaCl: na (Na) 2 SO 4 1:9, minimum 93.20% at 30 ℃, NaCl: na (Na) 2 SO 4 The concentration ratio of NaCl on the water production side is reduced along with the increase of the feed water concentration of the system when the temperature is 9:110 ℃ and is up to 99.51%.
According to the experimental result, the nano-filtration salt separation system has the advantages that the membrane flux is 20LHM, the temperature is 20 ℃, the recovery rate is 70%, and the mixed salt ratio is 9:1, the optimal salt separation effect is achieved under the operation condition of 1, and the mass concentration of the sodium chloride on the water production side reaches 99.51 percent.
Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the embodiments disclosed.
Claims (5)
1. A multi-stage adjustable nanofiltration system is characterized in that: the device comprises a raw water tank, a high-pressure pump, an activated carbon filter, a precision filter and a nanofiltration assembly which are sequentially connected in series, wherein the nanofiltration assembly comprises at least four membrane elements which are connected in series, and the produced water and the concentrated water of the last membrane element enter the next membrane element.
2. A salt separation process of a multistage adjustable nanofiltration system is characterized in that: the process comprises the following steps:
the preparation method comprises the steps of preparing raw material liquid, dissolving raw materials weighed once or for many times in a large beaker, and continuously stirring until the solution is clear and no obvious precipitated particle substances are generated;
transferring the electrolyte concentrated solution initially dissolved in the large beaker into a 150L raw water tank, flushing the large beaker at least three times by using a dispensing solvent with the same mass, and paying attention to constant volume to 150L while injecting the dispensing solvent into a raw water barrel;
thirdly, conveying the prepared electrolyte solution to nanofiltration equipment through an activated carbon filter and a precision filter by a high-pressure variable frequency pump, and under the driving of high pressure, allowing the raw material solution to flow into the roll-type nanofiltration membrane element through a pressure gauge in front of the membrane so as to start an electrolyte separation process;
electrolyte solution in the raw water tank flows through a membrane-behind concentrated water pressure gauge, a concentrated water valve and a concentrated water flowmeter in sequence through concentrated liquid of a concentrated water pipeline, and permeate liquid flowing through a water production pipeline flows through the water production flowmeter.
3. The salt separation process of the multi-stage adjustable nanofiltration system according to claim 2, wherein the salt separation process comprises the following steps: the salt separation process parameters are as follows: the average membrane flux of the system is 14-26LHM, the water inlet temperature is 10-30 ℃, the water inlet concentration is 2-10g/L, and the recovery rate of the system is maintained at 70%.
4. The salt separation process of the multi-stage adjustable nanofiltration system according to claim 2 or 3, wherein: the raw material liquid is: NaCl: na (Na) 2 SO 4 ＝1-9：9-1。
5. The salt separation process of the multi-stage adjustable nanofiltration system according to claim 2, wherein the salt separation process comprises the following steps: the optimal technological parameters of the salt separation technology are as follows: membrane flux 20LHM, temperature 20 ℃, recovery rate 70%, mixed salt ratio 9:1, the mass concentration ratio of sodium chloride on the water production side reaches 99.51%.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2197525A1 (en) * | 1996-02-14 | 1997-08-15 | Mahabala R. Adiga | Plating waste water treatment and metals recovery method |
| CN202893199U (en) * | 2012-03-29 | 2013-04-24 | 北京能泰高科环保技术股份有限公司 | Nanofiltration membrane device having effects of improving water resource recovery rate and reducing energy consumption |
| CN109824187A (en) * | 2017-11-23 | 2019-05-31 | 内蒙古久科康瑞环保科技有限公司 | It is a kind of multistage multistage nanofiltration divide salt treatment system and technique |
| CN111847683A (en) * | 2019-04-26 | 2020-10-30 | 国家能源投资集团有限责任公司 | Treatment method and treatment system for salt-containing water |
| CN112390271A (en) * | 2020-10-22 | 2021-02-23 | 内蒙古久科康瑞环保科技有限公司 | Multi-dimensional salt separation system and multi-dimensional salt separation method |
-
2022
- 2022-05-12 CN CN202210513332.4A patent/CN114853194A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2197525A1 (en) * | 1996-02-14 | 1997-08-15 | Mahabala R. Adiga | Plating waste water treatment and metals recovery method |
| CN202893199U (en) * | 2012-03-29 | 2013-04-24 | 北京能泰高科环保技术股份有限公司 | Nanofiltration membrane device having effects of improving water resource recovery rate and reducing energy consumption |
| CN109824187A (en) * | 2017-11-23 | 2019-05-31 | 内蒙古久科康瑞环保科技有限公司 | It is a kind of multistage multistage nanofiltration divide salt treatment system and technique |
| CN111847683A (en) * | 2019-04-26 | 2020-10-30 | 国家能源投资集团有限责任公司 | Treatment method and treatment system for salt-containing water |
| CN112390271A (en) * | 2020-10-22 | 2021-02-23 | 内蒙古久科康瑞环保科技有限公司 | Multi-dimensional salt separation system and multi-dimensional salt separation method |
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