CN112960784A - Composite filter element, preparation method thereof and water purifier with composite filter element - Google Patents
Composite filter element, preparation method thereof and water purifier with composite filter element Download PDFInfo
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- CN112960784A CN112960784A CN202110159521.1A CN202110159521A CN112960784A CN 112960784 A CN112960784 A CN 112960784A CN 202110159521 A CN202110159521 A CN 202110159521A CN 112960784 A CN112960784 A CN 112960784A
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- carbon fiber
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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
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
Abstract
The application relates to the technical field of water purification, and specifically discloses a composite filter element, which comprises a PP cotton layer, an activated carbon fiber cylinder, an ultrafiltration membrane shell and an ultrafiltration membrane from outside to inside. The traditional activated carbon particles are replaced by the activated carbon fibers, so that the activated carbon fibers and the ultrafiltration membrane can be combined into a CMF membrane structure, the volume of the filter element can be further reduced, and the water purification efficiency of the filter element can be ensured; the preparation method comprises the following steps: carbonizing and activating the carbon fiber by molten strong alkali, cleaning and neutralizing the carbon fiber by acid and distilled water, finally forming and drying the activated carbon fiber, and installing the ultrafiltration membrane. The whole production process is simple and is suitable for industrial production. In addition, be used for the water purifier with the composite filter element of this application, can promote the holistic water purification efficiency of water purifier effectively.
Description
Technical Field
The application relates to the technical field of water purification, in particular to a composite filter element, a preparation method thereof and a water purifier with the composite filter element.
Background
The water purifier is also called water purifier and water quality purifier, and is water treatment equipment for deeply filtering and purifying water according to the use requirement of water. The water purifier is generally used as a small purifier for household use.
In addition, the traditional water purifier mainly adopts a five-stage filtering technology, wherein the first stage is a filter element also called a PP cotton filter element (PPF), the second stage is a granular activated carbon (UDF) filter element, the third stage is a precision compressed activated Carbon (CTO) filter element, the fourth stage is a reverse osmosis membrane or an ultrafiltration membrane, and the fifth stage is rear activated carbon (small T33). Because five kinds of filter cores are designed independently, so, the general volume of traditional water purifier is all great, needs to occupy space also more.
Therefore, miniaturization is becoming the mainstream of water purifiers. In order to miniaturize the water purifier, the water purifier is manufactured by enterprises, and the combined filter element is generally used, so that the space of the water purifier is reduced.
For example, chinese patent publication No. CN105329973B discloses a composite filter element and a water purification system having the same, the composite filter element includes: the water-saving device comprises a shell, a water inlet and a water outlet, wherein a cavity is defined in the shell; the activated carbon fiber cylinder is arranged in the cavity, an installation cavity is limited in the activated carbon fiber cylinder, the activated carbon fiber cylinder is provided with a water inlet channel for communicating the outer wall surface of the activated carbon fiber cylinder with the installation cavity, and the water inlet channel is communicated with the water inlet; at least one part of the ultrafiltration membrane is arranged in the installation cavity, and a water outlet channel is arranged between the ultrafiltration membrane and the water outlet. Although the composite filter element also has a good function of purifying water quality, the radial thickness of the activated carbon fiber cylinder is larger in the actual production process because the selected activated carbon fiber cylinder needs to flow a longer distance in the activated carbon fiber cylinder when filtering water. Therefore, improvements are needed.
Disclosure of Invention
In order to ensure the water purifying effect of the water purifier and reduce the volume of the composite filter element, the application provides the composite filter element, the preparation method thereof and the water purifier with the composite filter element
The application provides a composite filter element and a preparation method thereof and a water purifier with the composite filter element, which adopt the following technical scheme:
in a first aspect, the present application provides a composite filter element, which adopts the following technical scheme:
a composite filter element mainly comprises a PP cotton layer, an activated carbon fiber cylinder, an ultrafiltration membrane shell and an ultrafiltration membrane from outside to inside.
By adopting the technical scheme, the diameter of the Active Carbon Fiber (ACF) is 5-20 mu m, and the average specific surface area is 1000-2000 m2The average pore diameter is 1.0-4.0 nm, and micropores are uniformly distributed on the surface of the fiber. Compared with granular activated carbon, the activated carbon fiber has the advantages of small and uniform micropore diameter, simple structure, high adsorption rate for adsorbing small molecular substances (such as residual chlorine in water), high adsorption speed and easy desorption.
Therefore, the activated carbon fiber is selected to replace the activated carbon in the traditional composite filter element, and the activated carbon fiber and the ultrafiltration membrane can form a CMF membrane structure, so that the water purification efficiency of the composite filter element can be ensured on one hand, and the volume of the composite filter element can be reduced on the other hand.
In a second aspect, the present application provides a method for preparing a composite filter element, which adopts the following technical scheme:
a preparation method of a composite filter element comprises the following steps,
firstly, taking strong base for melting, and then adding raw material fibers into the strong base for mixing;
step two, heating the mixture of the strong base and the raw material fiber to 520-600 ℃ at the speed of 12 ℃/min, and preserving heat for 1-2 hours to obtain activated carbon fiber;
washing the activated carbon fiber with acid and distilled water until the pH value of the washing liquid is constant to 7.0;
step four, making the washed activated carbon fiber into a cylinder shape according to requirements, and then drying the activated carbon fiber at the temperature of 80 ℃ to obtain an activated carbon fiber cylinder;
and step five, inserting the ultrafiltration membrane with the ultrafiltration membrane shell into the activated carbon fiber cylinder, and assembling the ultrafiltration membrane and the PP cotton layer together to form the finished product composite filter core.
By adopting the technical scheme, the raw material fiber is treated by strong alkali, so that the method has the advantages thatCan remove oil stain on the surface of the activated carbon fiber, and on the other hand, the activated carbon fiber is activated by strong alkali, so that the BET specific surface area of the obtained activated carbon fiber can be as high as 2913.4m2/g。
Preferably, the strong base used in the first step is one of sodium hydroxide, potassium hydroxide and lithium hydroxide.
By adopting the technical scheme, the sodium hydroxide, the strong potassium oxide and the strong lithium oxide are strong alkali which is easy to obtain, so that the production cost is reduced.
Preferably, the acid used in step three is hydrochloric acid.
By adopting the technical scheme, on one hand, the acidity of the hydrochloric acid is strong, and the hydrochloric acid can quickly neutralize the alkalinity of strong alkali, so that the surface pH value of the activated carbon fiber is close to neutral. On the other hand, if hydrochloric acid remains on the surface of the activated carbon fiber, the hydrochloric acid is volatilized again in the drying process, so that the proximity of the surface of the final activated carbon fiber cylinder is ensured.
Preferably, in the first step, the raw material fiber is a mixture of polyacrylonitrile fiber and coconut fiber, and the mass ratio of the polyacrylonitrile fiber to the coconut fiber is 1: (5-3).
Through adopting above-mentioned technical scheme, at first the coconut husk fibre acquires the convenience, and the coconut husk fibre itself just possesses there is more porosity, but because the coconut husk fibre is easy to take place the pyrolysis, consequently, chooses for use polypropylene fiber and coconut husk fibre to mix to whole carbon fiber thermal stability has been improved to a certain extent.
Preferably, the mass ratio of the strong base to the raw material fiber in the second step is (0.8-1): 1.
by adopting the technical scheme, the mass ratio of the strong base to the raw material fiber is more than 1: the value of 1, at this moment, the amount of strong base is too much, which easily causes a large degree of corrosion to the interior of the raw material fiber, so that the toughness of the raw material fiber after carbonization is obviously reduced.
Secondly, if the mass ratio of the strong base to the raw fiber is less than 0.8: 1, at this time, the strong base does not activate the raw fiber to a sufficient degree.
Preferably, in the fourth step, before drying, the nano TiO is taken2Adding the activated carbon fiber into a solvent, adding the washed activated carbon fiber into the solvent, taking out the activated carbon fiber after complete impregnation, and drying the activated carbon fiber.
By adopting the technical scheme, the activated carbon fiber is used as a carrier, and the nano TiO is used as a carrier2Attached to activated carbon fiber, such that nano TiO2The catalyst can catalyze and oxidize organic matters in water to decompose the organic matters into water and carbon dioxide, and further can reduce the content of organic poisons in the water.
Preferably, in the fifth step, after the activated carbon fiber cylinder is dried, the ultrafiltration membrane shell with the ultrafiltration membrane is directly installed in the activated carbon fiber cylinder.
By adopting the technical scheme, the activated carbon fiber is in an expanded state when being heated in the drying process. At this time, the ultrafiltration membrane shell can be easily installed in the activated carbon fiber cartridge. When the activated carbon fiber cylinder is cooled, the activated carbon fiber cylinder is contracted, so that the inner wall of the activated carbon fiber cylinder is tightly attached to the outer wall of the ultrafiltration membrane shell. Therefore, the scale deposit between the activated carbon fiber cylinder and the ultrafiltration membrane shell is not easy to deposit larger particles, so that the scale deposit can be smoothly removed through the activated carbon fiber cylinder in the backwashing process, and the cleaning effect of the filter element is ensured.
In a third aspect, the present application provides a water purification system, which adopts the following technical scheme:
the utility model provides a water purification system, includes the foretell composite filter element with a raw water import intercommunication, composite filter element and booster pump intercommunication, booster pump and RO membrane filter core intercommunication, RO membrane filter core communicates with dense water export and pure water outlet respectively.
Through adopting above-mentioned technical scheme, utilize the composite filter element of this application to replace traditional composite filter element, guarantee under normal filtration performance prerequisite like this, be favorable to dwindling composite filter element's volume.
In summary, the present application has the following beneficial effects:
1. because the activated carbon is replaced by the activated carbon fiber, the activated carbon fiber and the ultrafiltration membrane can form a CMF membrane structure, so that the volume of the filter element can be reduced, and the water purification effect can be ensured;
2. in the application, the mixed fiber of the coconut fiber and the polyacrylonitrile fiber is preferably adopted as the raw material fiber, so that on one hand, the activated carbon fiber can be ensured to have a large specific surface area and a large purification efficiency, and on the other hand, the toughness of the activated carbon fiber can also be ensured;
3. according to the method, the raw material fiber is directly treated by the molten strong base, so that the raw material can be quickly carbonized, and the activation effect on the carbon fiber can be realized, and the preparation efficiency of the activated carbon fiber is improved.
Drawings
FIG. 1 is a schematic view of a composite filter element according to example 1 of the present application;
FIG. 2 is an exploded view of a composite filter element according to example 1 of the present application;
fig. 3 is a schematic structural diagram of a water purification system in application example 1 of the present application;
fig. 4 is a system schematic diagram of a water purification system in application example 1 of the present application;
FIG. 5 is a side view of a placement cartridge and composite filter element of application example 1 of the present application;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;
fig. 7 is a schematic structural view of a closing door in application example 1 of the present application.
In the figure, 1, a housing; 11. a raw water inlet; 12. a concentrated water outlet; 13. a pure water outlet; 14. an opening; 15. an upper support block; 151. an upper clamping hole; 16. a lower support block; 161. a lower clamping hole; 17. closing the door; 171. an upper clamping block; 172. a lower clamping block; 18. an elastic sheet; 181. a locking hole; 2. a composite filter element; 21. an upper cover plate; 211. upward flanging; 212. a water outlet; 22. a PP cotton layer; 23. an activated carbon fiber cartridge; 231. a mounting cavity; 24. an ultrafiltration membrane shell; 241. a water inlet; 242. a glue fixing block; 243. a ring groove; 244. a seal ring; 25. ultrafiltration membranes; 251. a water outlet hole; 26. a lower cover plate; 261. downward flanging; 262. a plug-in sheet; 3. placing the cylinder; 31. a limiting ring; 32. a placement chamber; 321. embedding a groove; 322. a clamping groove; 4. a booster pump; 5. an RO membrane filter element; 6. a water inlet electromagnetic valve; 7. a concentrated water electromagnetic valve; 8. a high pressure solenoid valve.
Detailed Description
The present application will be described in further detail with reference to the following examples in conjunction with the accompanying drawings.
Example 1
A preparation method of a composite filter element comprises the following steps:
step one, taking lithium hydroxide for melting, and then adding raw material fibers into the lithium hydroxide for mixing;
step two, heating the mixture of the lithium hydroxide and the raw material fiber to 520 ℃ at the speed of 12 ℃/min, and preserving heat for 2 hours to obtain activated carbon fiber;
washing the activated carbon fiber with 35% hydrochloric acid and distilled water until the pH value of the washing liquid is constant to 7.0;
step four, making the washed activated carbon fiber into a cylinder shape according to requirements, and then drying the activated carbon fiber at the temperature of 80 ℃ to obtain an activated carbon fiber cylinder;
and step five, after the activated carbon fiber cylinder is dried, directly adding the ultrafiltration membrane with the ultrafiltration membrane shell into the activated carbon fiber cylinder, and assembling the ultrafiltration membrane and the PP cotton layer into a finished product composite filter core.
Wherein, the raw material fiber is a mixture of polyacrylonitrile fiber and coconut shell fiber, and the mass ratio of the polyacrylonitrile fiber to the coconut shell fiber is 1: 3. the mass ratio of the lithium hydroxide to the polyacrylonitrile fiber is 0.8: 1.
referring to fig. 1 and 2, the composite filter element 2 includes an upper cover plate 21, a lower cover plate 26, an activated carbon fiber cartridge 23, an ultrafiltration membrane housing 24, an ultrafiltration membrane 25, and a PP cotton layer 22.
Activated carbon fiber section of thick bamboo 23 is the cylinder setting, and activated carbon fiber section of thick bamboo 23 adopts the activated carbon granule to add the bonding agent and heats the sintering and form for activated carbon fiber section of thick bamboo 23 has the conducting hole on the peripheral lateral wall, can follow the axial lateral wall of activated carbon fiber section of thick bamboo 23 and permeate into water and filter chlorine residue and heterochrosis peculiar smell material. Activated carbon fiber section of thick bamboo 23's inside has mounting chamber 231, the length setting of 23 is followed to mounting chamber 231, mounting chamber 231's one end is sealed, ultrafiltration membrane shell 24 is the cylinder setting, ultrafiltration membrane shell 24 inlays and locates in mounting chamber 231, be equipped with a plurality of water inlets 241 on ultrafiltration membrane shell 24's the lateral wall, ultrafiltration membrane shell 24 is close to the one end fixedly connected with solid gum piece 242 of mounting chamber 231 opening 14 department, ultrafiltration membrane 25's one end fixed connection just passes solid gum piece 242 on solid gum piece 242, ultrafiltration membrane 25 stretches out the one end of solid gum piece 242 and is equipped with apopore 251, the mouth of pipe of sealed ultrafiltration membrane shell 24 of solid gum piece 242, make water can only follow the apopore 251 outflow in the ultrafiltration membrane 25. The ultrafiltration membrane 25 is placed in the ultrafiltration membrane shell 24, one end of the ultrafiltration membrane 25 extends out of the ultrafiltration membrane shell 24, glue is filled into the end of the ultrafiltration membrane shell, and after the glue is solidified, the glue extending out of the ultrafiltration membrane shell 24 and the ultrafiltration membrane 25 are cut off to form a glue fixing block 242.
An annular groove 243 is formed in one end, close to the water outlet hole 251 of the ultrafiltration membrane 25, of the ultrafiltration membrane shell 24, a sealing ring 244 is embedded in the annular groove 243, and the sealing ring 244 is in interference fit with the inner side wall of the activated carbon fiber cylinder 23, so that the outer side wall of the ultrafiltration membrane shell 24 is sealed with the inner side wall of the activated carbon fiber cylinder 23.
The PP cotton layer 22 is sleeved on the peripheral side wall of the activated carbon fiber cylinder 23 to primarily filter raw water and intercept particulate matters such as rust, silt and the like.
The upper cover plate 21 is installed at one end, close to the mounting cavity 231 opening 14, of the activated carbon fiber cylinder 23, of the PP cotton layer 22, the upper cover plate 21 is provided with an upper flanging 211 close to one side of the PP cotton layer 22, the upper flanging 211 is arranged in a circular ring shape, the upper flanging 211 is sleeved outside the PP cotton layer 22 and attached to the PP cotton layer 22, and therefore the upper cover plate 21 is fixed to the PP cotton layer 22. The upper cover plate 21 is provided with a water outlet 212, and the water outlet 212 is communicated with the water outlet hole 251, so that water entering the mounting cavity 231 of the activated carbon fiber cylinder 23 from the PP cotton layer 22 flows into the ultrafiltration membrane 25, passes through the water outlet hole 251 and then flows out of the water outlet 212.
The lower cover plate 26 is installed at one end, away from the opening 14, of the installation cavity 231 of the activated carbon fiber cylinder 23, of the PP cotton layer 22, the lower cover plate 26 is provided with a lower flanging 261 close to one side of the PP cotton layer 22, the lower flanging 261 is arranged in a circular ring shape, the lower flanging 261 is sleeved outside the PP cotton layer 22 and is attached to the PP cotton layer 22, and therefore the lower cover plate 26 is fixed to the PP cotton layer 22.
The implementation principle of a composite filter element 2 in embodiment 1 of the application is as follows: raw water enters the PP cotton layer 22 from the periphery of the composite filter element 2, particulate matters such as rust, silt and the like are filtered, residual chlorine, organic matters and the like are filtered through the activated carbon fiber cylinder 23, the residual chlorine, the organic matters and the like enter the ultrafiltration membrane shell 24, bacteria and viruses are removed through the ultrafiltration membrane 25, and finally water flows out from the water outlet 212 and flows out of pure water.
Example 2
A preparation method of a composite filter element comprises the following steps:
step one, taking sodium hydroxide for melting, and then adding raw material fibers into the sodium hydroxide for mixing;
step two, heating the mixture of the sodium hydroxide and the raw material fiber to 600 ℃ at the speed of 12 ℃/min, and preserving the heat for 1h to obtain activated carbon fiber;
washing the activated carbon fiber with 35% hydrochloric acid and distilled water until the pH value of the washing liquid is constant to 7.0;
step four, making the washed activated carbon fiber into a cylinder shape according to requirements, and then drying the activated carbon fiber at the temperature of 80 ℃ to obtain an activated carbon fiber cylinder;
and step five, after the activated carbon fiber cylinder is dried, directly adding the ultrafiltration membrane with the ultrafiltration membrane shell into the activated carbon fiber cylinder to form a finished product composite filter element with the activated carbon fiber cylinder 21, the ultrafiltration membrane shell 22 and the ultrafiltration membrane 23 from outside to inside.
Wherein, the raw material fiber is a mixture of polyacrylonitrile fiber and coconut shell fiber, and the mass ratio of the polyacrylonitrile fiber to the coconut shell fiber is 1: 5. the mass ratio of the sodium hydroxide to the polyacrylonitrile fiber is 1: 1. the structure of the composite filter element is the same as that of the embodiment 1.
Example 3
A preparation method of a composite filter element comprises the following steps:
step one, taking potassium hydroxide for melting, and then adding raw material fibers into the potassium hydroxide for mixing;
step two, heating the mixture of the potassium hydroxide and the raw material fiber to 560 ℃ at the speed of 12 ℃/min, and preserving the heat for 1.5h to obtain activated carbon fiber;
washing the activated carbon fiber with 35% hydrochloric acid and distilled water until the pH value of the washing liquid is constant to 7.0;
step four, making the washed activated carbon fiber into a cylinder shape according to requirements, and then drying the activated carbon fiber at the temperature of 80 ℃ to obtain an activated carbon fiber cylinder;
and step five, after the activated carbon fiber cylinder is dried, directly adding the ultrafiltration membrane with the ultrafiltration membrane shell into the activated carbon fiber cylinder to form a finished product composite filter element with the activated carbon fiber cylinder 21, the ultrafiltration membrane shell 22 and the ultrafiltration membrane 23 from outside to inside.
Wherein, the raw material fiber is a mixture of polyacrylonitrile fiber and coconut shell fiber, and the mass ratio of the polyacrylonitrile fiber to the coconut shell fiber is 1: 4. the mass ratio of the potassium hydroxide to the polyacrylonitrile fiber is 0.9: 1. the structure of the composite filter element is the same as that of the embodiment 1.
Examples 4,
This example differs from example 3 only in that the mass ratio between potassium hydroxide and raw fibers is 0.8: 1.
examples 5,
This example differs from example 3 only in that the mass ratio between potassium hydroxide and raw fibers is 1: 1.
comparative examples 1,
This comparative example differs from example 3 only in that the mass ratio between potassium hydroxide and raw fiber is 0.7: 1.
comparative examples 2,
This comparative example differs from example 3 only in that the mass ratio between potassium hydroxide and raw fibre is 1.2: 1.
comparative examples 3,
The difference between the present comparative example and example 3 is only that in step five of the present comparative example, after the activated carbon fiber cartridge is dried and cooled, the ultrafiltration membrane shell with the ultrafiltration membrane is installed in the activated carbon fiber cartridge.
Examples 6,
The difference between this example and example 3 is that in step four of this example, before drying, nano TiO is taken2Adding into DMF solvent to obtain liquid with solid-to-liquid ratio of 50g/L, and washingAdding the carbonized fiber into the solvent, taking out after completely soaking for 10min, and drying.
Comparative examples 4,
The comparative example differs from example 6 only in that the raw material fibers in the comparative example are all coconut shell fibers.
Comparative examples 5,
The comparative example is different from example 6 only in that the raw material fibers in the comparative example are all polyacrylonitrile fibers.
Application examples 1,
Referring to fig. 3 and 4, the water purifier includes a housing 1, an ultrafiltration membrane 25, a booster pump 4, an RO membrane filter element 5, a water inlet solenoid valve 6, a concentrated water solenoid valve 7, and a high pressure solenoid valve 8.
Be equipped with raw water inlet 11 on shell 1, dense water export 12 and pure water outlet 13, the milipore filter 25, the booster pump 4, RO membrane filter core 5, the solenoid valve 6 of intaking, dense water solenoid valve 7 and high-pressure solenoid valve 8 are all placed in shell 1, composite filter core 2 and raw water import 11 lead to pipe intercommunication, composite filter core 2 leads to pipe and booster pump 4's one end intercommunication, booster pump 4's the other end leads to pipe and RO membrane filter core 5 intercommunication, RO membrane filter core 5 and dense water export 12 and pure water outlet 13 intercommunication, make the raw water that gets into from raw water import 11 flow respectively from dense water export 12 and pure water outlet 13 behind milipore filter 25 and RO membrane filter core 5, the intercommunication water pipe is not drawn here.
The water inlet electromagnetic valve 6 is arranged between the composite filter element 2 and the booster pump 4 so as to cut off the water source of the system when the system stops producing water. The concentrate solenoid valve 7 is installed at the RO membrane cartridge 5 and the concentrate outlet 12 so that the wastewater of the RO membrane cartridge 5 can be discharged. The high-pressure electromagnetic valve 8 is arranged between the RO membrane filter element 5 and the pure water outlet 13 to control water production.
Fixedly connected with places a section of thick bamboo 3 in the shell 1, and the quantity of placing a section of thick bamboo 3 is two to place composite filter element 2 and RO membrane filter element 5. Fixedly connected with flexure strip 18 on the shell 1, the quantity of flexure strip 18 is at least four, and the quantity of this flexure strip 18 is eight, and two liang of cooperations of flexure strip 18 form locking hole 181, place a section of thick bamboo 3 and wear to locate in the locking hole 181 and make to place a section of thick bamboo 3 and be difficult for rocking. Place still fixedly connected with spacing ring 31 on a section of thick bamboo 3, the quantity of spacing ring 31 is two, and two spacing rings 31 butt respectively on the upper and lower lateral wall of flexure strip 18 for place section of thick bamboo 3 and wear to locate difficult the slip behind the locking hole 181.
Referring to fig. 5 and 6, one side of the lower cover plate 26, which is far away from the lower flange 261, is fixedly connected with a plurality of insertion pieces 262, the insertion pieces 262 are inclined and arranged outwards, the bottom of the cavity in which the cavity 32 is placed is provided with an embedding groove 321, the lower cover plate 26 is embedded in the embedding groove 321, the bottom of the embedding groove 321 is provided with a plurality of clamping grooves 322, and the insertion pieces 262 are inserted into the clamping grooves 322 to be clamped in the lower cover plate 26, so that the lower cover plate 26 is fixed in the embedding groove 321.
Referring to fig. 3 and 7, an opening 14 is formed at one side of the housing 1, and a closing door 17 is detachably coupled to the housing 1 to close the opening 14.
The lid closes door 17 and is close to joint piece 171 and lower joint piece 172 on the one end fixedly connected with of shell 1, goes up joint piece 171 and is located the upside that the lid closed door 17, and support block 15 is gone up to fixedly connected with on the last lateral wall that shell 1 is close to opening 14, goes up to be equipped with on the support block 15 and goes up joint hole 151, goes up joint piece 171 and inserts the joint in last joint hole 151. The lower clamping block 172 is located at the lower side of the covering door 17, the lower supporting block 16 is fixedly connected to the side wall of the casing 1 close to the opening 14, a lower clamping hole 161 is formed in the lower supporting block 16, the lower clamping block 172 is inserted into and clamped in the lower clamping hole 161, and the lower clamping block 172 is matched with the lower clamping hole 161 to fix the covering door 17 on the casing 1.
The application of a water purification system's implementation principle does: raw water enters from a raw water inlet 11, enters the composite filter element 2 through a water inlet electromagnetic valve 6, is subjected to secondary filtration through the RO membrane filter element 5, wastewater flows out from a concentrated water outlet 12 through a concentrated water electromagnetic valve 7, and pure water flows out from a pure water outlet 13 through a high-pressure electromagnetic valve 8.
Here, the RO membrane reverse osmosis cartridge was a model 669 RO membrane reverse osmosis cartridge purchased from shenzhen yu pure environmental technologies ltd.
Detection method
1. The bending strength of the activated carbon fiber is tested by using a bending tester;
2. respectively fixing the activated carbon fiber cylinder and the ultrafiltration membrane shell by using a tensile machine, then pulling, and testing the tensile strength required by the separation of the activated carbon fiber cylinder and the ultrafiltration membrane shell;
3. examples 1 to 5 and comparative examples 1 to 4 were each used as a composite filter element of the water purification system of application example 1, and as-received water containing 100ug/L of chlorine, 100ug/L of amine and 100ug/L of benzene was purified, and the contents of chlorine, amine and benzene in the purified water were measured by chromatography.
The test results are shown in table one:
table one test result of examples 1 to 6 and comparative examples 1 to 4
| Test items | Flexural strength/Pa | Tensile strength/Pa | Chlorine content/ug/L | Amine content/ug/L | Benzene content/ug/L |
| Example 1 | 84 | 63 | Not detected out | Not detected out | Not detected out |
| Example 2 | 83 | 66 | Not detected out | Not detected out | Not detected out |
| Example 3 | 87 | 64 | Not detected out | Not detected out | Not detected out |
| Example 4 | 85 | 66 | Not detected out | Not detected out | Not detected out |
| Example 5 | 86 | 65 | Not detected out | Not detected out | Not detected out |
| Comparative example 1 | 85 | 62 | 11.2 | 6.4 | 10.3 |
| Comparative example 2 | 63 | 62 | Not detected out | Not detected out | 1.5 |
| Comparative example 3 | 82 | 46 | 0.4 | 0.7 | 0.2 |
| Example 6 | 86 | 64 | Not detected out | Not detected out | Not detected out |
| Comparative example 4 | 70 | 63 | Not detected out | Not detected out | 1.7 |
| Comparative example 5 | 87 | 62 | 4.6 | 5.8 | 1.5 |
When the mass ratio between the potassium hydroxide and the raw material fiber is controlled to be (0.8-1): 1, the carbon fiber can be fully activated, and the toughness of the activated carbon fiber can be ensured;
in step five, after the activated carbon fiber cylinder is dried, the ultrafiltration membrane shell with the ultrafiltration membrane is directly installed in the activated carbon fiber cylinder, so that the activated carbon fiber cylinder and the ultrafiltration membrane shell can be tightly fixed together, and the purification efficiency is ensured;
by combining the embodiment 3 and the embodiment 6 and combining the table one, the activated carbon fiber modified by the nano titanium dioxide can effectively remove organic matters in water in the process of purifying water, thereby further improving the water purification effect;
by combining the comparison between the example 3 and the comparative examples 4 and 5 and combining the table one, the coconut fiber and the polyacrylonitrile fiber are selected as the mixed fiber to prepare the activated carbon fiber, so that the prepared composite filter element has high purification efficiency, and the stability of the raw material fiber during the mixing treatment with strong alkali can be ensured.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. A composite filter element, which is characterized in that: from outside to inside, comprises a PP cotton layer (22), an activated carbon fiber cylinder (23), an ultrafiltration membrane shell (24) and an ultrafiltration membrane (25).
2. The method of making a composite filter element of claim 1, wherein: comprises the following steps of (a) carrying out,
firstly, taking strong base for melting, and then adding raw material fibers into the strong base for mixing;
step two, heating the mixture of the strong base and the raw material fiber to 520-600 ℃ at the speed of 12 ℃/min, and preserving heat for 1-2 hours to obtain activated carbon fiber;
washing the activated carbon fiber with acid and distilled water until the pH value of the washing liquid is constant to 7.0;
step four, making the washed activated carbon fiber into a cylinder shape according to requirements, and then drying the activated carbon fiber at the temperature of 80 ℃ to obtain an activated carbon fiber cylinder;
and step five, inserting the ultrafiltration membrane with the ultrafiltration membrane shell into the activated carbon fiber cylinder, and assembling the ultrafiltration membrane and the PP cotton layer into the composite filter element.
3. The method of claim 2, wherein the method comprises the steps of: the strong base used in the first step is one of sodium hydroxide, potassium hydroxide and lithium hydroxide.
4. The method of claim 2, wherein the method comprises the steps of: the acid used in the third step is hydrochloric acid.
5. The method of claim 2, wherein the method comprises the steps of: in the first step, the raw material fiber is a mixture of polyacrylonitrile fiber and coconut shell fiber, and the mass ratio of the polyacrylonitrile fiber to the coconut shell fiber is 1: (5-3).
6. The method of making a composite filter element of claim 5, wherein: in the second step, the mass ratio of the strong base to the raw material fiber is (0.8-1): 1.
7. the method of claim 2, wherein the method comprises the steps of: in the fourth step, before drying, the nano TiO is taken2Adding the activated carbon fiber into a solvent, adding the washed activated carbon fiber into the solvent, taking out the activated carbon fiber after complete impregnation, and drying the activated carbon fiber.
8. The method of claim 2, wherein the method comprises the steps of: and step five, directly installing the ultrafiltration membrane shell with the ultrafiltration membrane into the activated carbon fiber cylinder after the activated carbon fiber cylinder is dried.
9. A water purification system, its characterized in that: comprising the composite filter element (2) of claim 1 in communication with a raw water inlet (11), said composite filter element (2) being in communication with a booster pump (4), said booster pump (4) being in communication with an RO membrane filter element (5), said RO membrane filter element (5) being in communication with a concentrated water outlet (12) and a pure water outlet (13), respectively.
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