CN110885112A - Composite membrane element suitable for different water qualities and manufacturing method - Google Patents
Composite membrane element suitable for different water qualities and manufacturing method Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 227
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 145
- 239000002131 composite material Substances 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000001728 nano-filtration Methods 0.000 claims abstract description 63
- 230000004907 flux Effects 0.000 claims abstract description 13
- 238000001223 reverse osmosis Methods 0.000 claims description 70
- 239000004744 fabric Substances 0.000 claims description 22
- 238000005096 rolling process Methods 0.000 claims description 13
- 238000010612 desalination reaction Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims 3
- 235000020188 drinking water Nutrition 0.000 abstract description 8
- 239000003651 drinking water Substances 0.000 abstract description 8
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 abstract description 5
- 229910001424 calcium ion Inorganic materials 0.000 abstract description 5
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 abstract description 4
- 229910001425 magnesium ion Inorganic materials 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 3
- 239000008399 tap water Substances 0.000 description 12
- 235000020679 tap water Nutrition 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229920000742 Cotton Polymers 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Classifications
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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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/58—Multistep processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a composite membrane element suitable for different water qualities and a manufacturing method thereof. The composite membrane element has the advantages of wide application range, guarantee of healthy drinking water, no scaling, high flux, higher rejection rate of calcium ions, magnesium ions and the like than that of a single nanofiltration membrane, and effective improvement of the service life of the composite membrane element.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a composite membrane element suitable for different water qualities and a manufacturing method thereof.
Background
Along with the improvement of the economic and living standards of China, the requirements of people on the quality of drinking water are higher and higher, and the water purifier is more and more commonly applied to families of residents. TDS (Total dissolved solids) is one of the important indexes for detecting the effluent quality of the water purifier. Due to the influence of geographical locations, the TDS of tap water in north and south regions has great difference. The TDS distribution condition of the tap water quality in China counted according to the Bolebao map is shown in Table 1, the TDS range distribution of the tap water in China is very wide, and is from less than 100mg/L to more than 500mg/L, and aiming at the water body with the TDS lower than 100mg/L, the TDS of the produced water can be in the range of 30-90mg/L by adopting the single nanofiltration membrane element at present; aiming at the water body with TDS higher than 500mg/L, the TDS of the produced water can be in the range of 30-90mg/L by adopting the single reverse osmosis membrane element at present. However, the TDS of 78 percent of tap water in China is 100-500mg/L, and the TDS of produced water cannot be in the range of 30-90mg/L by using a single nanofiltration membrane and a single reverse osmosis membrane. Therefore, membrane elements with different properties are selected according to different water qualities, the TDS of the produced water is stabilized at 30-90mg/L, the drinking water is ensured to be healthy and not to be scaled, the operation performance of the membrane elements can be optimized, and the method has important significance.
TABLE 1 TDS distribution of tap water quality in China, as counted by Bolebao map
The application of the prior single reverse osmosis membrane element in the water purifier has the following defects: (1) the flux is small and is lower than that of a nanofiltration membrane; (2) because the reverse osmosis membrane highly intercepts inorganic calcium ions, carbonate and sulfate radicals, the scaling of inorganic calcium carbonate and calcium sulfate is easily caused, and the membrane flux is sharply reduced in the use process with low wastewater rate; (3) the water produced by the reverse osmosis membrane is close to pure water, and scientific research shows that people drink pure water with extremely low mineral content for a long time, which is not beneficial to human health.
At present, a single nanofiltration membrane has the advantages of high organic matter removal rate, high heavy metal removal rate, high flux, low wastewater rate, difficulty in scaling and the like, but because the interception rate of the single nanofiltration membrane on calcium ions, magnesium ions and the like in tap water is low, when the single nanofiltration membrane is directly used in regions with high hardness and high alkalinity, water scale still can be generated during water boiling, and the drinking taste is influenced.
Disclosure of Invention
The invention aims to solve the problems that the current membrane element has a narrow application range, a single reverse osmosis membrane has small flux, a membrane concentrated water side is easy to scale, the service life is short, the single nanofiltration membrane has low desalination rate, and the boiling water is not scaled, and provides a composite membrane element and a manufacturing method which are suitable for different water qualities.
The technical scheme adopted by the invention is as follows: a manufacturing method of a composite membrane element suitable for different water qualities comprises the following steps:
and 4, placing the folded end of the reverse osmosis membrane and the nanofiltration membrane on one side of the central pipe, and sequentially stacking the reverse osmosis membrane group and the nanofiltration membrane group on the bottom pure water flow channel cloth in any order and then winding the reverse osmosis membrane group and the nanofiltration membrane group on the periphery of the central pipe.
Preferably, the membrane area ratio of the two membranes in step 1 can be determined according to the following formula:
the reverse osmosis membrane (RO) and the nanofiltration membrane (NF) are mixed and rolled, and the desalination rate (R) theoretical formula of the mixed rolling membrane element is as follows:
wherein R (NF) and R (RO) are respectively the salt rejection rates of the NF membrane and the RO membrane rolling membrane element; v (NF) and V (RO) respectively represent the volume of the solution passing through the NF membrane and the RO membrane in the mixed rolling membrane element; j (NF) and J (RO) are the fluxes of the NF membrane and the RO membrane, respectively; a is the area ratio of a nanofiltration membrane (NF); b is the area ratio of reverse osmosis membrane (RO);
theoretical formula of water flow (Q) of mixed roll membrane element:
Q＝Q(NF)×a+Q(RO)×b
wherein Q (NF) is the water production flow rate of the NF membrane rolling and membrane making element, and Q (RO) is the water production flow rate of the RO membrane rolling and membrane making element.
A composite membrane element suitable for different water qualities comprises a central tube, a reverse osmosis membrane group and a nanofiltration membrane group, wherein the reverse osmosis membrane group comprises a reverse osmosis membrane, a concentrated water channel cloth of the reverse osmosis membrane group and a pure water channel cloth, and the nanofiltration membrane group comprises a nanofiltration membrane, a concentrated water channel cloth of the nanofiltration membrane group and a pure water channel cloth.
Preferably, the reverse osmosis membrane and the nanofiltration membrane are folded in half, so that the desalination layers of the membranes are arranged in opposite directions, the inner surfaces of the reverse osmosis membrane and the nanofiltration membrane form a water inlet channel, a water production channel is formed between the adjacent outer surfaces of the reverse osmosis membrane and the nanofiltration membrane, the concentrated water channel is arranged in the water inlet channel, and the pure water channel is arranged in the water production channel.
Preferably, the reverse osmosis membrane and the nanofiltration membrane are oppositely folded and arranged at one side of the central pipe, and the reverse osmosis membrane group and the nanofiltration membrane group can be sequentially stacked on the bottom pure water flow channel cloth in any order and then wound on the periphery of the central pipe.
The invention has the advantages and positive effects that:
(1) the composite membrane for mixing and rolling different membranes can be applied to different water qualities of inlet water by adjusting the area ratio, so that the TDS of the produced water is 30-90mg/L, the drinking water is healthy and free of scaling, and the application range is wide.
(2) The membrane with other performance characteristics is introduced in the process of rolling the membrane element, and the length and the width of the membrane bag are optimally adjusted, so that the flux of the whole composite membrane element is higher than that of a single reverse osmosis water purification membrane element and the rejection rate of calcium ions, magnesium ions and the like is higher than that of a single nanofiltration membrane under the same membrane element model and test conditions, and the effects of stabilizing the quality of produced water and preventing scaling during water boiling can be achieved. In addition, the design of the composite membrane element can not only share the scaling ion concentration load of the concentrated water side of the single reverse osmosis membrane and reduce the inorganic scaling trend of the concentrated water side of the reverse osmosis membrane, but also change the flowing condition of water flow in the composite membrane element, thereby effectively prolonging the service life of the composite membrane element.
Drawings
Fig. 1 is a schematic structural view of a composite membrane element of the present invention.
FIG. 2 is a schematic view of a rolling method of the composite film element of the present invention.
Description of reference numerals:
1-reverse osmosis membrane; 2-concentrated water flow channel cloth of the reverse osmosis membrane group; 3-pure water flow passage cloth; 4-nanofiltration membrane; 5-dense water flow channel cloth of a nanofiltration membrane group; 6-a central tube; 7-bottom layer pure water flow passage cloth.
Detailed Description
In order that those skilled in the art will fully understand the technical contents of the present invention, the present invention will be described with reference to specific examples. These examples are intended to further illustrate the advantages and features of the invention, and are not intended to limit the invention.
A composite membrane element suitable for different water qualities comprises a central tube 6, a reverse osmosis membrane group and a nanofiltration membrane group, wherein the reverse osmosis membrane group comprises a reverse osmosis membrane 1, a concentrated water flow channel cloth 2 of the reverse osmosis membrane group and a pure water flow channel cloth 3, and the nanofiltration membrane group comprises a nanofiltration membrane 4, a concentrated water flow channel cloth 5 of the nanofiltration membrane group and a pure water flow channel cloth 3.
The reverse osmosis membrane 1 and the nanofiltration membrane 4 are folded in half, so that the desalination layers of the membranes are arranged in an opposite mode, water inlet channels are formed on the inner surfaces, water production channels are formed between the adjacent outer surfaces, the concentrated water channels are arranged in the water inlet channels, and the pure water channel cloth 3 is located in the water production channels. The double-folded ends of the reverse osmosis membrane 1 and the nanofiltration membrane 4 are placed on one side of the central pipe 6, and the reverse osmosis membrane group and the nanofiltration membrane group can be sequentially stacked on the bottom pure water flow channel cloth 7 in any order and then wound on the periphery of the central pipe 6.
According to the Bolebao map, TDS is taken as an index, the water quality of Chinese tap water is divided into four grades of TDS < 100mg/L, 100 plus 300mg/L, 300 plus 500mg/L and more than 500mg/L, four composite water purification filter elements with different area ratios are obtained aiming at the four water bodies, wherein the area with better water quality (TDS < 100mg/L) and the area with poor water quality (TDS >500mg/L), the area ratios of a reverse osmosis membrane (RO) and a nanofiltration membrane are respectively 0% and 100% in the composite membrane element, and the area ratios of the two membrane areas and the length and width design of the membrane bag are determined to meet the water production requirement according to theoretical formula calculation and actual water body test in the areas with 100 plus 300mg/L and 300 plus 500mg/L of TDS.
TABLE 2 Membrane area ratio of composite membrane element
The following is an embodiment of the composite membrane element applicable to different water qualities according to the present invention.
The first embodiment is as follows:
the water quality in a certain city of Yunnan is taken as inlet water, the total solid salt content (TDS) of the inlet water is 94.3mg/L, the water pressure is 0.2-0.6MPa, the recovery rate is 60 percent, tap water enters a composite membrane element after being filtered by PP cotton and an active carbon filter element, and the area ratio of a reverse osmosis membrane to a nanofiltration membrane in the composite membrane element is 1. The TDS of the produced water under different pressures is shown in the table below, and the TDS of the produced water falls between 30 and 90mg/L, so that the drinking water is healthy.
TABLE 3 Water quality of produced water of water purifying filter element with inlet TDS less than 100mg/L
Example two:
the water quality of a Beijing area (TDS is 290.2mg/L) and Fujian city (TDS is 160.8mg/L) is respectively used as inlet water, the water pressure is 0.2-0.6MPa, the recovery rate is 60 percent, tap water enters a composite membrane element after being filtered by PP cotton and an active carbon filter element, and the area ratio of a reverse osmosis membrane to a nanofiltration membrane in the composite membrane element is 2. The TDS of the produced water under different pressures is shown in the table below, and the TDS of the produced water falls between 30 mg/L and 90mg/L, so that certain beneficial mineral substances such as calcium, magnesium, potassium and the like are reserved, and drinking water is healthy.
TABLE 4 Water quality of water produced by water purification filter element with inlet TDS of 100-
Example three:
a water source in Shanxi city (TDS is 480.7mg/L) and Anhui city (TDS is 350.2mg/L) is used as inlet water, the water pressure is 0.2-0.6MPa, the recovery rate is 60%, tap water enters a composite membrane element after being filtered by PP cotton and an activated carbon filter element, and the area ratio of a reverse osmosis membrane to a nanofiltration membrane in the composite membrane element is 3. The TDS of the produced water under different pressures is shown in the table below, and the TDS of the produced water falls between 30 mg/L and 90mg/L, so that certain beneficial mineral substances such as calcium, magnesium, potassium and the like are reserved, and drinking water is healthy.
TABLE 5 nanofiltration/reverse osmosis composite water purification filter element produced water with inlet TDS of 300-
Example four:
the water quality in Ningxia city is used as inlet water, the total solid salt content (TDS) of the inlet water is 658.5mg/L, the water pressure is 0.2-0.6MPa, the recovery rate is 60%, tap water is filtered by PP cotton and an active carbon filter element and then enters a composite membrane element, and the area ratio of a reverse osmosis membrane to a nanofiltration membrane in the composite membrane element is 4. The TDS of the produced water under different pressures is shown in the table below, and the TDS of the produced water falls between 30 and 90mg/L, so that the drinking water is healthy.
TABLE 6 quality of water produced by reverse osmosis composite water purification filter element with inlet TDS of more than 500mg/L
Example five:
the method is characterized in that a water source in Shanxi city (with TDS of 480.7mg/L) is used as inlet water, the water pressure is 0.6MPa, the recovery rate is 60%, tap water is filtered by PP cotton and an activated carbon filter element and then enters a composite membrane element (the area ratio of a reverse osmosis membrane to a nanofiltration membrane in the composite membrane element is 3) and a reverse osmosis membrane element consisting of a reverse osmosis membrane, and the performances of the composite membrane element and a single reverse osmosis filter element in the anti-scaling aspect are examined. As shown in Table 7, under the same water inlet condition, the TDS of the produced water of the composite membrane element is 60-70mg/L, while the TDS of the produced water of the single reverse osmosis filter element is 5-13mg/L, which indicates that the produced water of the composite membrane element better meets the requirement of healthy water and can retain a certain amount of beneficial ions; from the flow, under the same water inlet pressure and the same membrane area, the water production flow of the composite membrane element is 630mL/min, and the water production flow of the single reverse osmosis filter element is 410mL/min, which indicates that the water production flux of the composite membrane element is larger and better meets the flux requirement of the water purifier; from the aspects of service life and inorganic scaling resistance, when the flow rate declines by 50%, the tonnage of water produced by the composite membrane element is 13 tons, and the tonnage of water produced by the single reverse osmosis membrane element is 5 tons, which is far lower than that of the composite membrane element, so that the calcium ions, magnesium ions, sulfate radicals and carbonate ions which are originally intercepted by the reverse osmosis membrane can partially permeate the nanofiltration membrane by utilizing the composition of the nanofiltration membrane, the concentration of scaling ions on the concentrated water side of the filter element is reduced, and the inorganic scaling resistance of the reverse osmosis membrane is improved. In addition, by utilizing the compounding of the nanofiltration membranes, when water flows on the surfaces of the nanofiltration membranes and the reverse osmosis membranes in the same composite membrane element under the same water inlet pressure, due to the difference of the flux of the nanofiltration membranes and the reverse osmosis membranes, the water flows on the surfaces of the nanofiltration membranes and the reverse osmosis membranes have mutual disturbance, and the disturbance can prevent a large amount of inorganic scale blocks from being formed, so that the service life of the composite membrane element is prolonged.
TABLE 7 comparison of composite membranes and Single reverse osmosis elements
The above description is only a partial example of the present invention and is not intended to limit the present invention. All the modifications and improvements made to the above examples according to the technical essence of the present invention fall within the scope of the present invention.
Claims (6)
1. A manufacturing method of a composite membrane element suitable for different water qualities is characterized by comprising the following steps:
step 1, determining the membrane area ratio of two membranes according to the quality of inlet water, the operating conditions of a water purifier and the desalination and flux characteristics of a reverse osmosis membrane and a nanofiltration membrane;
step 2, cutting the reverse osmosis membrane and the nanofiltration membrane according to the required area ratio and the size optimally designed according to the length and the width of the membrane bag;
step 3, folding the cut reverse osmosis and nanofiltration membranes in half, so that the desalination layers of the membranes are arranged in opposite directions, a water inlet flow channel is formed on the inner surface, a water production flow channel is formed between the adjacent outer surfaces, a concentrated water flow channel is arranged in the water inlet flow channel, and a pure water flow channel is arranged in the water production flow channel;
and 4, placing the folded end of the reverse osmosis membrane and the nanofiltration membrane on one side of the central pipe, and sequentially stacking the reverse osmosis membrane group and the nanofiltration membrane group on the bottom pure water flow channel cloth in any order and then winding the reverse osmosis membrane group and the nanofiltration membrane group on the periphery of the central pipe.
2. The method according to claim 1, wherein the membrane area ratio of the two types of membrane sheets in step 1 is determined according to the following formula:
the reverse osmosis membrane (RO) and the nanofiltration membrane (NF) are mixed and rolled, and the desalination rate (R) theoretical formula of the mixed rolling membrane element is as follows:
wherein R (NF) and R (RO) are respectively the salt rejection rates of the NF membrane and the RO membrane rolling membrane element; v (NF) and V (RO) respectively represent the volume of the solution passing through the NF membrane and the RO membrane in the mixed rolling membrane element; j (NF) and J (RO) are the fluxes of the NF membrane and the RO membrane, respectively; a is the area ratio of a nanofiltration membrane (NF); b is the area ratio of reverse osmosis membrane (RO);
theoretical formula of water flow (Q) of mixed roll membrane element:
Q＝Q(NF)×a+Q(RO)×b
wherein Q (NF) is the water production flow rate of the NF membrane rolling and membrane making element, and Q (RO) is the water production flow rate of the RO membrane rolling and membrane making element.
3. A composite membrane element suitable for different water qualities, characterized by being manufactured by the manufacturing method according to claim 1 or 2.
4. The composite membrane element of claim 3, wherein the composite membrane element comprises a central tube, a reverse osmosis membrane module and a nanofiltration membrane module, the reverse osmosis membrane module comprises a reverse osmosis membrane, a concentrate channel fabric of the reverse osmosis membrane module and a pure water channel fabric, and the nanofiltration membrane module comprises a nanofiltration membrane, a concentrate channel fabric of the nanofiltration membrane module and a pure water channel fabric.
5. The composite membrane element suitable for different water qualities according to claim 4, wherein the reverse osmosis membrane and the nanofiltration membrane are folded in half, such that the desalination layers of the membranes are arranged in a face-to-face manner, the inner surfaces of the membranes form water inlet channels, the adjacent outer surfaces form water production channels, the concentrate channels are arranged in the water inlet channels, and the pure water channels are arranged in the water production channels.
6. The composite membrane element suitable for different water qualities according to claim 5, wherein the reverse osmosis membrane and the nanofiltration membrane are folded in opposite directions and are placed on one side of the central tube, and the reverse osmosis membrane and the nanofiltration membrane can be sequentially stacked on the bottom pure water flow channel cloth in any order and then wound on the periphery of the central tube.
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| CN114162993A (en) * | 2021-08-31 | 2022-03-11 | 佛山市美的清湖净水设备有限公司 | Water purifier |
| CN114163002A (en) * | 2021-08-31 | 2022-03-11 | 佛山市美的清湖净水设备有限公司 | Waterway system and water purifier |
| CN114162994A (en) * | 2021-08-31 | 2022-03-11 | 佛山市美的清湖净水设备有限公司 | Water purifier |
| CN114570210A (en) * | 2022-03-30 | 2022-06-03 | 沃顿科技股份有限公司 | Reverse osmosis and nanofiltration composite membrane component and preparation |
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