Nanofiltration water purification system

Abstract

The utility model belongs to the technical field of water purification, and particularly relates to a nanofiltration water purification system which comprises a raw water tank, a nanofiltration membrane mechanism and a nanofiltration water tank, the raw water tank is connected with the nanofiltration membrane mechanism; the nanofiltration membrane mechanism is connected with the nanofiltration water tank; a raw water pump is connected between the raw water tank and the nanofiltration membrane mechanism, the raw water pump is suitable for pumping raw water in the raw water tank into the nanofiltration membrane mechanism, the nanofiltration membrane mechanism is suitable for filtering raw water, and produced water of the nanofiltration membrane mechanism flows into the nanofiltration water tank; compared with the prior art, the traditional filtering method is replaced to prepare higher-grade drinking water, compared with reverse osmosis, ingredients rich in nutrition for human bodies in water can be reserved, such as ions such as k < + >, cl <-> and Na < + >, TDS can be treated and reduced by 50-60%, the hardness (in terms of CaCO3) can be treated to be below 40 ppm, and part of nutrient substances are reserved and can be easily absorbed by the human bodies.

Description

Technical Field

[0001] The utility model belongs to the technical field of water purification, and specifically relates to a nanofiltration water purification system. Background Art

[0002] In the pretreatment process of the existing purified water system in the pharmaceutical water system, softeners and activated carbon are widely used. The softener is used to reduce the hardness (calcium and magnesium ions) in the water to reduce the risk of RO membrane scaling in the subsequent system. The sodium ions of the resin in the softener replace the calcium and magnesium ions in the water during operation, reducing the hardness of the water. After a period of operation, the sodium ion adsorption is saturated and a large amount of salt is consumed for regeneration. In addition, a large amount of manual participation is required in the process of replacing salt, which generates a lot of extra physical labor for the operating technicians in the production workshop of the pharmaceutical factory. The consumption of regeneration salt is related to the size and production capacity of the softener in the system. It takes ~160g of salt to regenerate 1L of softening resin.

[0003] Activated carbon filters are usually designed to remove heavy metals, oxidizing substances (such as residual chlorine) and organic matter from drinking water. Due to the porous surface area of ​​activated carbon itself, it is easy to accumulate microorganisms during operation and become a hotbed for microbial growth. Therefore, activated carbon filters need to be designed for online high-temperature pasteurization in pharmaceutical water. Industrial steam is consumed during the pasteurization process, and the price of industrial steam in my country is also high, usually 200~300 yuan / m3 depending on the region;

[0004] Traditional multi-media filters are widely used in the front stage of pharmaceutical water preparation and pretreatment to remove suspended matter, colloids and other impurities in water; reduce the turbidity in water to ≤1NTU, SDI15≤5; but the filter is subject to the uneven distribution of the filter layer, resulting in frequent fluctuations in the effluent water quality. The instability affects the operation of the reverse osmosis membrane and EDI device of the back-end purification unit, affecting the service life of key components or shortening their cleaning cycle.

[0005] Therefore, based on the technical problems of complex filtration structure and high filtration cost in the purified water system in the related art, it is necessary to design a new nanofiltration water purification system. Utility Model Content

[0006] The utility model aims to provide a nanofiltration water purification system to solve the technical problem of complex filtration structure and high filtration cost.

[0007] In order to solve the above technical problems, the utility model provides a nanofiltration water purification system, comprising:

[0008] Raw water tank, nanofiltration membrane mechanism and nanofiltration water tank;

[0009] The raw water tank is connected to the nanofiltration membrane mechanism;

[0010] The nanofiltration membrane mechanism is connected to the nanofiltration water tank;

[0011] A raw water pump is connected between the raw water tank and the nanofiltration membrane mechanism. The raw water pump is suitable for pumping raw water in the raw water tank into the nanofiltration membrane mechanism. The nanofiltration membrane mechanism is suitable for filtering raw water, and the produced water of the nanofiltration membrane mechanism flows into the nanofiltration water tank.

[0012] Furthermore, a pre-filter is connected between the raw water pump and the nanofiltration membrane mechanism;

[0013] The pre-filter is suitable for pre-filtering raw water pumped into the nanofiltration membrane mechanism.

[0014] Furthermore, a backwash pump is connected to the nanofiltration water tank.

[0015] Furthermore, a backwash pipeline is provided between the water production end of the nanofiltration membrane mechanism and the nanofiltration water tank;

[0016] The backwash pipeline is provided with valve 15, valve 16 and valve 17;

[0017] The backwash pump is arranged on the backwash pipeline, one end of the backwash pump is connected to the nanofiltration water tank through valve 15, and the other end of the backwash pump is connected to the water outlet end of the nanofiltration membrane mechanism through valve 16 and valve 17.

[0018] Furthermore, a second dosing device is connected between the backwash pump and the nanofiltration water tank.

[0019] Furthermore, a valve 1 is provided on the raw water tank;

[0020] The raw water tank is provided with a second valve, and the second valve is arranged close to the bottom of the raw water tank.

[0021] Furthermore, a liquid level meter is provided on the raw water tank.

[0022] Furthermore, a first dosing device is connected between the raw water tank and the raw water pump.

[0023] Furthermore, the concentrated water outlet end of the nanofiltration membrane mechanism is connected with a valve 13;

[0024] The valve 13 is used to discharge concentrated water.

[0025] Furthermore, a pressure sensor is provided at the water inlet end of the nanofiltration membrane mechanism;

[0026] A pressure sensor is provided at the water outlet of the nanofiltration membrane mechanism.

[0027] The beneficial effects of the utility model are as follows: the utility model is provided with a raw water tank, a nanofiltration membrane mechanism and a nanofiltration water tank; the raw water tank is connected to the nanofiltration membrane mechanism; the nanofiltration membrane mechanism is connected to the nanofiltration water tank; a raw water pump is connected between the raw water tank and the nanofiltration membrane mechanism, the raw water pump is suitable for pumping raw water in the raw water tank into the nanofiltration membrane mechanism, the nanofiltration membrane mechanism is suitable for filtering raw water, and the produced water of the nanofiltration membrane mechanism flows into the nanofiltration water tank; it realizes the replacement of traditional filtration for preparing higher grade drinking water, compared with reverse osmosis, it can retain the nutritious components in the water for the human body, such as K+, Cl-, Na+ ions, TDS can be reduced by 50-60%, the hardness (measured in CaCO3) is treated to below 40ppm, and some nutrients are retained, which are easily absorbed by the human body.

[0028] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 The utility model discloses a pipeline diagram of a nanofiltration water purification system.

[0032] In the figure:

[0033] 1. Raw water tank; 2. Raw water pump; 3. Pre-filter; 4. Nanofiltration membrane mechanism; 5. Nanofiltration water tank; 6. Backwash pump; 7. First dosing device; 8. Second dosing device; 9. Valve one; 10. Valve two; 11. Valve three; 12. Valve four; 13. Valve five; 14. Valve six; 15. Valve seven; 16. Valve eight; 17. Valve nine; 18. Valve ten; 19. Valve eleven; 20. Valve twelve; 21. Valve thirteen; 22. Valve fourteen; 23. Valve fifteen; 24. Valve sixteen; 26. Valve seventeen; 27. Table one; 28. Table two; 29. ​​Table three; 30. Table four; 31. Table five; 32. Table six. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In at least one embodiment, a nanofiltration water purification system is provided, comprising: a raw water tank 1, a nanofiltration membrane mechanism 4 and a nanofiltration water tank 5; a hollow fiber PES nanofiltration membrane is arranged in the nanofiltration membrane mechanism 4 for filtration; the raw water tank 1 is connected to the nanofiltration membrane mechanism 4; the nanofiltration membrane mechanism 4 is connected to the nanofiltration water tank 5; a raw water pump 2 is connected between the raw water tank 1 and the nanofiltration membrane mechanism 4, the raw water pump 2 is suitable for pumping the raw water in the raw water tank 1 into the nanofiltration membrane mechanism 4, the nanofiltration membrane mechanism 4 is suitable for filtering the raw water, and the produced water of the nanofiltration membrane mechanism 4 flows into the nanofiltration water tank 5; it realizes the replacement of traditional filtration for preparing higher grade drinking water, compared with reverse osmosis, it can retain the nutritious components in the water for the human body, such as K+, Cl-, Na+ ions, TDS (total dissolved solids) can be reduced by 50~60%, the hardness (measured in CaCO3) is treated to below 40ppm, and some nutrients are retained, which are easily absorbed by the human body.

[0036] Replace the multi-unit filters (multi-media filters, softeners and activated carbon filters) in the traditional filtration system. Each unit filter can only remove one or two impurity elements. In traditional pretreatment, multi-media and activated carbon filters use physical principles (filtration and van der Waals force) to remove impurities. Softeners use chemical means to exchange equal amounts of ions. The conductivity of the treated water itself will not change. The nanofiltration system can remove a wide range of colloids, suspended solids, TDS, microorganisms, viruses, TOC, hardness and other water components. The pure water preparation system combined with high-temperature reverse osmosis and EDI has broad prospects in the pharmaceutical water and food and beverage industries.

[0037] The nanofiltration membrane has a chlorine resistance of more than 400× and uses unique and low-cost materials. It has superior chlorine resistance than traditional nanofiltration membranes and does not require complex pre-filtration protection. Due to the use of new nanofiltration membranes, the membrane surface is selectively charged, which can achieve high flux and high removal rate; low operating pressure, energy saving compared to traditional nanofiltration membranes, product quality stability, and lower fixed investment; it can be backwashed, the membrane cleaning efficiency is high, and the membrane performance is stable; the system recovery rate is higher; the nanofiltration membrane has a good function of removing microorganisms and TOC.

[0038] A pre-filter 3 is connected between the raw water pump 2 and the nanofiltration membrane mechanism 4; the pre-filter 3 is suitable for pre-filtering the raw water pumped into the nanofiltration membrane mechanism 4; a backwash pump 6 is connected to the nanofiltration water tank 5; a backwash pipeline is arranged between the water production end of the nanofiltration membrane mechanism 4 and the nanofiltration water tank 5; a valve 15 23, a valve 16 24 and a valve 17 26 are arranged on the backwash pipeline; the backwash pump 6 is arranged on the backwash pipeline, one end of the backwash pump 6 is connected to the nanofiltration water tank 5 through the valve 15 23, and the other end of the backwash pump 6 is connected to the water production outlet end of the nanofiltration membrane mechanism 4 through the valve 16 24 and the valve 17 26; A second dosing device 8 is connected between the backwash pump 6 and the nanofiltration water tank 5; a valve one 9 is provided on the raw water tank 1; a valve two 10 is provided on the raw water tank 1, and the valve two 10 is provided close to the bottom of the raw water tank 1; a liquid level gauge is provided on the raw water tank 1; a first dosing device 7 is connected between the raw water tank 1 and the raw water pump 2; a valve thirteen 21 is connected to the concentrate outlet end of the nanofiltration membrane mechanism 4; the valve thirteen 21 is used to discharge the concentrate; a pressure sensor is provided at the water inlet end of the nanofiltration membrane mechanism 4; a pressure sensor is provided at the water production outlet end of the nanofiltration membrane mechanism 4.

[0039] The nanofiltration membrane mechanism 4 can be connected to a CIP cleaning device to flush the nanofiltration membrane mechanism 443; a valve 1 9 (pneumatic angle seat valve) is also provided on the raw water tank 1, through which raw water can be added to the raw water tank 1; a valve 2 10 is provided at the bottom of the raw water tank 1, through which the raw water in the raw water tank 1 can be drained; a valve 3 11 is provided between the raw water tank 1 and the raw water pump 2, and by opening the valve 3 11, the raw water pump 2 can pump out the raw water in the raw water tank 1 and input it into the pre-filter 3; a valve 4 12 is provided between the raw water pump 2 and the pre-filter 3; a valve 5 13 and a valve 6 14 are provided between the pre-filter 3 and the nanofiltration membrane mechanism 4. 4. Valve seven 15 and valve eight 16. Valve five 13 can be a sampling valve for sampling the water entering the nanofiltration membrane mechanism 4. Valve six 14 can control the on-off between the nanofiltration membrane mechanism 4 and the pre-filter 3. Valve seven 15 can be used to connect the nanofiltration membrane mechanism 4 with the CIP cleaning equipment. Valve eight 16 can discharge the backwash solution passing through the nanofiltration membrane mechanism 4 during backwashing. The concentrated water outlet on the nanofiltration membrane mechanism 4 is connected to valve thirteen 21 and valve fourteen 22. Valve thirteen 21 can be used to discharge concentrated water, and the discharge flow rate is adjustable. When the CIP cleaning equipment is cleaned, valve fourteen 22 can be connected to the water inlet of the CIP cleaning equipment. ; Valve nine 17, valve ten 18, valve eleven 19 and valve twelve 20 are arranged between the water outlet of the nanofiltration membrane mechanism 4 and the nanofiltration water tank 5. Valve nine 17 can control the on-off between the water outlet of the nanofiltration membrane mechanism 4 and the nanofiltration water tank 5. Valve eleven 19 is connected to the pipeline between valve nine 17 and the water outlet of the nanofiltration membrane mechanism 4. If the water produced by the nanofiltration membrane mechanism 4 is unqualified, the unqualified water will be discharged through valve eleven 19. At this time, valve nine 17 can be closed to prevent unqualified water from entering the nanofiltration water tank 5. Valve ten 18 is connected to the pipeline between valve nine 17 and the water outlet of the nanofiltration membrane mechanism 4. During CIP cleaning When the equipment is cleaned, valve ten 18 can be connected to the water inlet of the CIP cleaning equipment, and valve twelve 20 is arranged on the pipeline between valve nine 17 and the nanofiltration water tank 5. Valve twelve 20 can be a sampling valve, which is used to sample and detect whether the water produced by the nanofiltration membrane mechanism 4 is qualified; a backwash pipeline is also arranged between the water production end of the nanofiltration membrane mechanism 4 and the nanofiltration water tank 5, and valve fifteen 23, valve sixteen 24 and valve seventeen 26 are arranged on the backwash pipeline. The backwash pump 6 is arranged on the backwash pipeline, and one end of the backwash pump 6 is connected to the nanofiltration water tank 5 through valve fifteen 23, and the other end of the backwash pump 6 is connected to the water production outlet end of the nanofiltration membrane mechanism 4 through valve sixteen 24 and valve seventeen 26.

[0040] The liquid medicine added by the first dosing device 7 is located between valve three 11 and the raw water pump 2 ; the liquid medicine added by the second dosing device 8 is located between valve sixteen 24 and valve seventeen 26 .

[0041] A gauge 1 27, i.e., a liquid level gauge, is arranged on the raw water tank 1 to detect the raw water level in the raw water tank 1; a gauge 2 28 and a gauge 3 29 are arranged before and after the pre-filter 3, and both gauges 28 and 3 29 are pressure gauges; a gauge 4 30 is arranged between the pre-filter 3 and the valve 5 13, and the gauge 4 30 is a flow meter; a gauge 5 31 is arranged between the valve 6 14 and the nanofiltration membrane mechanism 4, and the gauge 5 31 is a pressure sensor; a gauge 6 32 is arranged between the water outlet end of the nanofiltration membrane mechanism 4 and the valve 9 17, and the gauge 6 32 is a pressure sensor.

[0042] The nanofiltration water purification system is divided into operation, backwashing, and CIP cleaning modes. 1. In the operation mode: the raw water is replenished into the raw water tank 1 through the pneumatic angle seat valve (valve one 9), and the raw water is transported to the pre-filter 3 through the raw water pump 2. After pre-filtration, it enters the nanofiltration membrane mechanism 4 for treatment, and the produced water flows into the nanofiltration water tank 5. The concentrated water is directly discharged through the valve thirteen 21. At this time, the valve three 11, valve four 12, valve six 14, valve nine 17 and valve thirteen 21 are opened, and the other valves are closed. The valve thirteen 21 manually adjusts the concentrated water discharge flow. The pressure sensor (table five 31 and table six 32) is used to monitor the pressure during the operation process and alarm when the pressure is too high. The sampling valve (valve five 13 and valve twelve 20) is used for sampling the nanofiltration inlet and produced water. The unqualified produced water of the nanofiltration is discharged through the valve eleven 19. In this process, the opening of the pneumatic angle seat valve is linked to the liquid level of the raw water tank 1 (detected by table one 27), and the valve two 10 is used to empty the raw water tank 1. The sodium hypochlorite added by the first dosing device 7 is used to inhibit the growth of microorganisms before the raw water pump 2. Pressure gauges are set before and after the pre-filter 3, and the filter element is replaced according to the pressure difference; 2. In the backwash mode: valve 15 23, valve 16 24, valve 17 26, valve 13 21, valve 14 22 and valve 8 16 are opened, and the other valves are closed. At the same time, the second dosing device 8 adds sodium hypochlorite to the backwash pipeline; 3. In the CIP cleaning mode: connect the CIP cleaning equipment to valve 7 15, valve 10 18 and valve 14 22, and clean the nanofiltration membrane mechanism 4 in a cycle.

[0043] In summary, the utility model comprises a raw water tank, a nanofiltration membrane mechanism and a nanofiltration water tank; the raw water tank is connected to the nanofiltration membrane mechanism; the nanofiltration membrane mechanism is connected to the nanofiltration water tank; a raw water pump is connected between the raw water tank and the nanofiltration membrane mechanism, the raw water pump is suitable for pumping raw water in the raw water tank into the nanofiltration membrane mechanism, the nanofiltration membrane mechanism is suitable for filtering raw water, and the produced water of the nanofiltration membrane mechanism flows into the nanofiltration water tank; it realizes the replacement of traditional filtration to prepare higher-grade drinking water, compared with reverse osmosis, it can retain the nutritious components in the water for the human body, such as K+, Cl-, Na+ ions, TDS can be reduced by 50~60%, the hardness (measured in CaCO3) is treated to below 40ppm, and some nutrients are retained, which are easily absorbed by the human body.

[0044] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0045] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] With the above-mentioned ideal embodiments of the present invention as inspiration, through the above-mentioned description content, relevant staff can make various changes and modifications without departing from the scope of the technical idea of ​​the present invention.

Claims

1. A nanofiltration water purification system, characterized in that: include: Raw water tank, nanofiltration membrane mechanism and nanofiltration water tank; The raw water tank is connected to the nanofiltration membrane mechanism; The nanofiltration membrane mechanism is connected to the nanofiltration water tank; A raw water pump is connected between the raw water tank and the nanofiltration membrane mechanism. The raw water pump is suitable for pumping raw water in the raw water tank into the nanofiltration membrane mechanism. The nanofiltration membrane mechanism is suitable for filtering raw water, and the produced water of the nanofiltration membrane mechanism flows into the nanofiltration water tank.

2. The nanofiltration water purification system according to claim 1, characterized in that: A pre-filter is connected between the raw water pump and the nanofiltration membrane mechanism; The pre-filter is suitable for pre-filtering raw water pumped into the nanofiltration membrane mechanism.

3. The nanofiltration water purification system according to claim 1, characterized in that: The nanofiltration water tank is connected with a backwash pump.

4. The nanofiltration water purification system according to claim 3, characterized in that: A backwash pipeline is provided between the water production end of the nanofiltration membrane mechanism and the nanofiltration water tank; The backwash pipeline is provided with valve 15, valve 16 and valve 17; The backwash pump is arranged on the backwash pipeline, one end of the backwash pump is connected to the nanofiltration water tank through valve 15, and the other end of the backwash pump is connected to the water outlet end of the nanofiltration membrane mechanism through valve 16 and valve 17.

5. The nanofiltration water purification system according to claim 4, characterized in that: A second dosing device is connected between the backwash pump and the nanofiltration water tank.

6. The nanofiltration water purification system according to claim 1, characterized in that: The raw water tank is provided with a valve 1; The raw water tank is provided with a second valve, and the second valve is arranged close to the bottom of the raw water tank.

7. The nanofiltration water purification system according to claim 1, characterized in that: The raw water tank is provided with a liquid level meter.

8. The nanofiltration water purification system according to claim 1, characterized in that: A first dosing device is connected between the raw water tank and the raw water pump.

9. The nanofiltration water purification system according to claim 1, characterized in that: The concentrated water outlet end of the nanofiltration membrane mechanism is connected to a valve 13; The valve 13 is used to discharge concentrated water.

10. The nanofiltration water purification system according to claim 1, characterized in that: A pressure sensor is provided at the water inlet end of the nanofiltration membrane mechanism; A pressure sensor is provided at the water outlet of the nanofiltration membrane mechanism.

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