KR102233010B1 - Filter for water treatment and preparation method thereof - Google Patents

Abstract

The present invention relates to a water treatment filter and a method of manufacturing the same, and more particularly, more specifically, a step of mixing a positive charge additive, a binder fiber, a cellulose fiber, a carbon powder, a zeolite and water; And it relates to a method for manufacturing a water treatment filter and the filter comprising the step of forming.

Description

Water treatment filter and its manufacturing method TECHNICAL FIELD

The present invention relates to a water treatment filter and a method of manufacturing the same, and more particularly, by containing a positive charge additive, binder fiber, cellulose fiber, carbon powder and silver zeolite, it is possible to improve the durability of the filter, completely remove bacteria, and effectively remove even hardness components. It relates to a water treatment filter that can be used and a method of manufacturing the same.

Water treatment filters are used to remove various pollutants contained in water, and the main removal mechanism is that substances larger than the pores of the filter cannot pass through the filter, and substances smaller than the pores pass through the filter. Is removed.

These water treatment filters are typically applied to water treatment plants, sewage treatment plants, various industrial plants, and water purifiers used in offices and homes.

Filters can be largely divided into reverse osmosis membranes, nanofiltration membranes, ultrafiltration membranes, and microfiltration membranes, and ultrafiltration membranes and microfiltration membranes have relatively large pores, so they have excellent permeability, but it is difficult to remove very fine particles. Reverse osmosis membranes and nanofiltration membranes can remove even very small particles, but they have relatively low permeability and have a problem in that maintenance costs such as power and installation costs are high because water must be supplied at a high pressure.

On the other hand, in water, a hardness-inducing substance represented by calcium and magnesium is contained in a dissolved state, and in particular, a large amount of these hardness substances is dissolved in groundwater. High hardness water is often not suitable for industrial use because it forms scale in the pipe as well as drinking water.

Such a method of removing hardness may include injection of chemicals, adsorption using ion exchange resin, reverse osmosis membrane or nanofiltration membrane, but as described above, reverse osmosis membrane or nanofiltration membrane is expensive to maintain, and chemicals or ion exchange resin are additional facilities. As is required, there is a limit to application to small-scale water treatment products such as water purifiers.

In addition, the water treatment filter must have durability and permeability to ensure stable water quality and long-term use by completely removing various bacteria.

Korean Patent Application Publication No. 2005-0126143 Korean Registered Patent Publication No. 1470620

The present invention was devised to solve the above problems, and to provide a water treatment filter capable of effectively removing soluble hardness-inducing substances, including particulate contaminants contained in water, and a method of manufacturing the same. The purpose.

Another object of the present invention is to provide a water treatment filter capable of completely removing bacteria in water and stably maintaining durability and permeability, and a method of manufacturing the same.

In order to solve such a technical problem, a method of manufacturing a water treatment filter according to the present invention includes mixing a positive charge additive, a binder fiber, a cellulose fiber, a carbon powder, a zeolite, and water; And it characterized in that it comprises the step of molding.

Here, the step of mixing the positively charged additive, binder fiber, cellulose fiber, carbon powder, zeolite, and water includes: i) preparing a first mixture by mixing the positively charged additive and water, and then adding the carbon powder to the first mixture. A first step of preparing a second mixture by mixing zeolite, preparing a third mixture by mixing water and binder fibers, and then mixing cellulose fibers with the third mixture to prepare a fourth mixture; Ii) a second step of preparing a fifth mixture by mixing the second mixture and the fourth mixture prepared in the first step; And iii) a third step of preparing a raw material mixture in a slurry state by further mixing a positive charge additive to the fifth mixture prepared in the second step,

The forming may include: iv) a fourth step of laminating the raw material mixture prepared in the third step on a mesh belt; And v) a fifth step of dehydrating the raw material mixture stacked on the mesh belt.

In addition, after the fifth step, vi) a sixth step of pressing the dehydrated raw material mixture with a pressure roller; And vii) a seventh step of hot air drying.

In addition, the fifth step may include a first dehydration step of decompressing the moment the raw material mixture is stacked on the mesh belt; And a second dehydration step after the first dehydration step.

In addition, the positive charge additive is an epichlorohydrin-dimethylamine copolymer, the binder fiber is at least one selected from the group consisting of polyethylene, polypropylene, and polyethylene terephthalate, and the zeolite has a diameter It is characterized in that it is a silver zeolite of 2 ~ 3㎛.

In addition, the vacuum pressure in the first dehydration step of the fifth step is 50 to 80 cmHg, and the vacuum pressure in the second dehydration step is 10 to 40 cmHg.

In addition, in the sixth step, the pressure is pressed at a pressure of 3 to 7 atmospheres, and in the seventh step, hot air drying is performed at a temperature of 100 to 150°C.

In addition, the water treatment filter according to the present invention includes 4.0 to 4.5 parts by weight of a positively charged additive which is an epichlorohydrin-dimethylamine copolymer; 0.4 to 1.4 parts by weight of any one or more binder fibers selected from the group consisting of polyethylene and polyethylene terephthalate; 0.4 to 1.4 parts by weight of carbon powder; 0.08 to 0.1 parts by weight of silver zeolite; And 7.0 to 8.5 parts by weight of cellulose fibers, but having an average pore size of 0.35 to 0.50 μm, and a bacteria removal rate exceeding 99.99%.

According to the water treatment filter and manufacturing method of the present invention having the above configuration, a positive charge additive, binder fiber, cellulose fiber, carbon powder, silver zeolite are included, and thus various contaminants including bacteria contained in water and hardness are induced. It has the effect of being able to remove substances effectively.

In addition, according to the method of manufacturing a water treatment filter according to the present invention, after preparing a positive charge additive, carbon powder, and silver zeolite mixture, by mixing and stirring with cellulose containing binder fibers, a positive charge is sufficiently formed on the surface of cellulose and thus contaminants There is an advantage that the removal efficiency of the can be increased.

In addition, according to the method of manufacturing the filter for water treatment according to the present invention, since the first vacuum dehydration is performed at the moment when the raw material slurry mixture is stacked on the mesh belt, it is possible to reduce the load applied to the mesh belt as well as to reduce the bonding between fibers. Because it is made, there is an advantage that a filter having a uniform thickness can be manufactured.

1 is a flowchart illustrating a method of manufacturing a water treatment filter according to an embodiment of the present invention.
2 is a block diagram of an apparatus for manufacturing a water treatment filter according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments of the present invention and the drawings, which will be described in detail enough to allow those of ordinary skill in the art to easily implement the present invention. For this purpose, it does not mean that the technical spirit and scope of the present invention are limited thereto.

In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning of the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in the present application. Does not.

1 is a flowchart illustrating a method of manufacturing a water treatment filter according to an embodiment of the present invention. As shown in FIG. 1, the method of manufacturing a water treatment filter according to the present invention includes a step of mixing and molding a positive charge additive, a binder fiber, a cellulose fiber, a carbon powder, a zeolite, and water.

Specifically, the step of mixing the positively charged additive, binder fiber, cellulose fiber, carbon powder, zeolite and water includes: i) preparing a first mixture by mixing the positively charged additive and water, and then adding carbon powder and zeolite to the first mixture. A first step of preparing a second mixture by mixing and preparing a third mixture by mixing water and binder fibers, and then mixing cellulose fibers with the third mixture to prepare a fourth mixture, ii) the first step A second step of preparing a fifth mixture by mixing the second mixture and the fourth mixture prepared in step 2, and iii) preparing a raw material mixture in a slurry state by additionally mixing a positive charge additive to the fifth mixture prepared in the second step. It includes a third step.

And the forming step, iv) a fourth step of laminating the raw material mixture prepared in the third step on a mesh belt, iv) a fifth step of dewatering the raw material mixture stacked on the mesh belt, iv) the dehydrated raw material mixture It comprises a sixth step of pressing with a pressure roller, and vii) a seventh step of hot air drying.

Explaining the above steps in more detail, i) the first step is a step of preparing a first mixture to a fourth mixture, and the first mixture is prepared by mixing a positively charged additive and water. At this time, the positive charge additive is preferably mixed in a ratio of 4.0 to 4.5 kg based on 500 L of water. If the mixing amount of the positive charge additive is less than 4.0 kg, the positive charge formed on the fiber surface is insufficient and the ability to remove contaminants decreases, whereas if it exceeds 4.5 kg, the bonding force between the fibers is too strong and dehydration is not performed properly. , It is preferable that the positive charge additive is mixed in the above ratio.

Here, the positive charge additive is preferably an epichlorohydrin-dimethylamine copolymer.

The first mixture consisting of the above mixing ratio is stirred for 45 to 75 minutes at a speed of 1300 to 1800 RPM in a stirrer.

The second mixture is prepared by mixing carbon powder and zeolite powder with the first mixture.

At this time, it is preferable to mix the carbon powder in a ratio of 0.4 to 1.5 kg and the zeolite powder in a ratio of 0.05 to 0.15 kg.

If the amount of carbon powder is less than 0.4kg, the adsorption effect of contaminants is not sufficiently exhibited, whereas if the amount exceeds 1.5kg, the amount of fiber decreases, making it difficult to control the basis weight and pores during filter manufacturing. It is preferable to mix in proportions.

Here, the carbon powder is preferably a coconut shell activated carbon having a _{D 50} of 16 to 27 µm, and the zeolite is preferably a silver zeolite _{having a D 50 of 2 to 3 µm.}

When the amount of silver zeolite powder is less than 0.15kg, the ability to remove hard substances is lowered, and the biodegradation of cellulose fibers is promoted due to the decrease in sterilizing power, resulting in a decrease in durability and bacteria removal rate of permeate. In this case, since the basis weight and thickness of the filter are unnecessarily increased, the silver zeolite is preferably mixed in the above ratio. And if the diameter of the silver zeolite is less than 2㎛, the possibility of the silver zeolite being lost through the fibers in the filter manufacturing process is high. On the contrary, if the diameter exceeds 3㎛, it is difficult to fully expect the hardness material removal ability and sterilization power because the diameter is too large. It is preferable to have a diameter in the above range.

The second mixture consisting of the above blending ratio is stirred for 45 to 75 minutes at a speed of 1300 to 1800 RPM in a stirrer.

The third mixture is prepared by mixing water and binder fibers.

When the binder fiber is based on 500L of water, it is preferable to be mixed in a ratio of 0.4 to 1.5kg. When the amount of the binder fiber is less than 0.4 kg, the bonding strength of the filter decreases during the heat and ultrasonic bonding process. On the contrary, when the amount exceeds 1.5 kg, the content of cellulose is relatively low, and thus the function as a filter cannot be sufficiently exhibited. Is preferably mixed in the above ratio.

Here, the binder fiber is preferably a beating-treated synthetic fiber having a diameter of 10 to 20 μm and a length of 0.5 to 2 μm, more preferably any one or more selected from the group consisting of polyethylene, polypropylene and polyethylene terephthalate, and , It is most preferred that it is polyethylene.

The third mixture consisting of the above mixing ratio is stirred for 100 to 140 minutes at a speed of 1300 to 1800 RPM in a stirrer.

The fourth mixture is prepared by mixing cellulose fibers with the third mixture.

At this time, the cellulose fibers are preferably mixed in a ratio of 7.0 to 8.5kg.

When the mixing amount of the cellulose fiber is less than 7.0 kg, the zeolite retention rate is low, and when it exceeds 8.5 kg, it is difficult to manufacture the filter due to the decrease in the pore control and dehydration power, so the cellulose fiber is preferably mixed in the above ratio. Here, cellulose can be obtained from various herbaceous or woody materials, and for example, wood fibers can be obtained through mechanical methods such as a grinder, a high pressure homogenizer, and a microfluidizer.

Moreover, it is preferable that the diameter of a cellulose fiber is 0.1-5 micrometers.

The fourth mixture consisting of the above blending ratio is stirred for 100 to 140 minutes at a speed of 1300 to 1800 RPM in a stirrer.

Ii) The second step is a step of preparing a fifth mixture by mixing the second mixture and the fourth mixture, and may be stirred under the same conditions as the first step.

Meanwhile, the first mixture, the second mixture, the third mixture, and the fourth mixture were not mixed all at once, and a second mixture from the first mixture and a fourth mixture from the third mixture were separately prepared, and then the second mixture and the fourth mixture were prepared. The reason for preparing the fifth mixture by mixing the mixture is to maximize the formation of positive charges on the surface of the cellulose fibers.

That is, when the positive charge additive, carbon powder, zeolite powder, binder fiber, and cellulose fiber are mixed together, the positive charge is not sufficiently formed on the cellulose surface due to the binder fiber.

Iii) In the third step, water and a positive charge additive are additionally mixed with the fifth mixture prepared in the second step to prepare a raw material mixture in a slurry state.

Here, the reason why the positively charged additive is not injected at one time in the first mixture preparation step, but is added to the fifth mixture is to allow the positively charged additive to be evenly distributed on the carbon powder surface and the fiber surface. In the fifth mixture in which the particles are evenly dispersed, a positively charged additive is additionally injected.

Step iv) is a step of laminating the raw material mixture in a slurry state prepared in step iii) on a mesh belt, and as an example, the manufacturing apparatus shown in FIG. 2 may be used.

Specifically, the raw material mixture prepared in step iii) is transferred to the hopper 100 by a pump (not shown), and the spray nozzle 110 connected to one side of the hopper 100 is a mesh belt moving at a predetermined speed. (200) The raw material slurry mixture is sprayed to the top.

Here, it is preferable that the spray nozzle 110 of the hopper 100 is located inside the head box 300 forming a separate space by being blocked from the outside.

Step v) is a step of dehydrating the raw material mixture stacked on the mesh belt 200, and may be composed of a first dehydration step and a second dehydration step.

Specifically, in the first dehydration step, the moment the raw material mixture is stacked on the mesh belt 200, the raw material mixture is dehydrated with the first vacuum dewatering device 310 located on the lower surface of the mesh belt 200, which is the opposite surface on which the raw material mixture is stacked. In this case, the vacuum pressure is preferably 50 to 80 cmHg.

If the primary dehydration is performed at the moment when the raw material mixture is stacked on the mesh belt 200 as described above, the load applied to the mesh belt 200 can be reduced, thereby reducing the maintenance cost of the device, and in particular, the primary dehydration. Since the fiber is bonded by the mesh belt 200, even if the mesh belt 200 moves slightly inclined, the stacked raw material slurry mixture is maintained as it is, thereby obtaining a filter having a uniform thickness.

The second dehydration step is a step of further lowering the moisture of the raw material slurry mixture that has been dehydrated and at the same time inducing more dense bonding between fibers, and a second decompression dehydration device 400 located behind the first decompression dehydration device 310. ), and a natural gravity equation is also possible, but it is preferable to dehydrate under reduced pressure with a vacuum pressure of 10 to 40 cmHg.

Step vi) is a step of pressurizing the dehydrated raw material mixture. The dehydrated raw material slurry mixture on the top of the mesh belt 200 is transferred to a pair of pressurized rollers 500 spaced at predetermined intervals and pressurized.

Step vii) is a step of hot air drying. In the dehydration step, as a step of completely drying some residual moisture to obtain a filter, it is preferable to perform hot air drying in a drying apparatus 600 maintained at a temperature of 100 to 150°C.

Thereafter, if necessary, it may be wound with the winding device 700, and any one or more of the step of additionally stacking the raw material slurry mixture on the mesh belt, the dehydration step, and the pressure step hot air drying step may be repeatedly performed.

Hereinafter, a method of manufacturing a water treatment filter according to the present invention will be described in more detail through specific examples.

Example 1

0.675 kg of epichlorohydrin dimethylamine copolymer was mixed and stirred in 500 L of water to prepare a second mixture by injecting 0.45 kg of carbon powder and 0.09 kg of silver zeolite powder into the first mixture and the first mixture. Separately, 1.35 kg of polyethylene was mixed and stirred in 500 L of water, and 7.2 kg of cellulose nanofibers were injected into the third mixture and the third mixture to prepare a fourth mixture.

Subsequently, the second mixture and the fourth mixture were mixed and stirred to prepare a fifth mixture, and then 3.6 kg of epichlorohydrin dimethylamine copolymer and 600 L of water were mixed with the fifth mixture to prepare a raw material mixture in a slurry state.

The thus prepared raw material mixture was sprayed with a mesh belt using the apparatus of FIG. 2, and then dehydrated, pressurized, and hot air dried to prepare a filter.

Example 2

When preparing the third mixture, the same conditions as in Example 1 were prepared, except that 0.45 kg of polyethylene terephthalate was mixed and stirred instead of 1.35 kg of polyethylene to inject 8.1 kg of cellulose nanofibers into the third mixture and the third mixture to prepare a fourth mixture. To prepare a raw material mixture.

Example 3

Raw material mixture under the same conditions as Example 1, except that 1.35 kg of carbon powder was injected when preparing the second mixture, and 0.45 kg of polyethylene terephthalate was mixed and stirred instead of 1.35 kg of polyethylene when preparing the third mixture to prepare a third mixture. Prepared.

Comparative Example 1

When preparing the second mixture, 2.25 kg of carbon powder was injected without adding silver zeolite powder, and 0.45 kg of polyethylene was mixed and stirred to prepare a third mixture when preparing the third mixture, and 6.39 kg of cellulose nanofibers when preparing the fourth mixture. A raw material mixture was prepared under the same conditions as in Example 1, except for mixing.

Positive charge addition
(kg) Binder fiber
(kg) Carbon powder
(kg) Silver zeolite powder (kg) Cellulose fiber (kg) Example 1 4.275 1.35 0.45 0.09 7.2 Example 2 4.275 0.45 0.45 0.09 8.1 Example 3 4.275 0.45 1.35 0.09 7.2 Comparative Example 1 4.275 0.45 2.25 - 6.39

Experimental example

In order to evaluate the performance of filters manufactured under the conditions of Examples 1 to 3 and Comparative Example 1, basis weight, average pore size, air permeability, and bacterial removal rate were investigated, and the results are shown in Table 2.

Basis weight (g/m ² ) Pore (㎛) Air permeability (CFM) Bacterial removal rate (%) Example 1 301 0.38 0.35 100 Example 2 298 0.36 0.37 99.9987 Example 3 270 0.48 0.43 99.9909 Comparative Example 1 296 0.70 0.48 99.99

The average pores of Examples 1 to 3 were 0.38 to 0.48 μm, whereas Comparative Example 1 was found to be 0.70 μm, which was 0.22 to 0.32 μm larger than these. In addition, the bacteria removal rate (%) was 99.9909% or more in Examples 1 to 3, while Comparative Example 1 was only 99.99%, and in particular, Example 1 was able to completely remove bacteria.

So far, the present invention has been looked at around its preferred embodiments. Those of ordinary skill in the art to which the present invention pertains will be able to understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative point of view rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the above description, and the scope equivalent thereto should be construed as being included in the present invention.

100: hopper
110: injection nozzle
200: mesh belt
300: head box
310: first decompression dehydration device
400: second decompression dehydration device
500: pressure roller
600: drying device
700: winding device

Claims (8)

Mixing a positive charge additive, binder fiber, cellulose fiber, carbon powder, zeolite and water; And
Including the step of molding,
The step of mixing the positive charge additive, binder fiber, cellulose fiber, carbon powder, zeolite and water,
I) After preparing a first mixture by mixing a positive charge additive and water, preparing a second mixture by mixing carbon powder and zeolite in the first mixture, and preparing a third mixture by mixing water and a binder fiber, A first step of preparing a fourth mixture by mixing cellulose fibers with the third mixture;
Ii) a second step of preparing a fifth mixture by mixing the second mixture and the fourth mixture prepared in the first step; And
Iii) a third step of preparing a raw material mixture in a slurry state by further mixing a positive charge additive to the fifth mixture prepared in the second step,
The forming step,
Iv) a fourth step of laminating the raw material mixture prepared in the third step on a mesh belt; And
V) A method of manufacturing a water treatment filter comprising a fifth step of dewatering the raw material mixture stacked on the mesh belt.
delete The method of claim 1,
After the fifth step,
Vi) a sixth step of pressing the dehydrated raw material mixture with a pressure roller; And
Vii) A method of manufacturing a water treatment filter, further comprising a seventh step of hot air drying.
The method of claim 1,
The fifth step may include a first dehydration step of decompressing the moment the raw material mixture is stacked on the mesh belt; And
A method of manufacturing a water treatment filter, characterized in that consisting of a step of secondary dehydration after the first dehydration step.
The method of claim 1,
The positive charge additive is an epichlorohydrin-dimethylamine copolymer,
The binder fiber is any one or more selected from the group consisting of polyethylene, polypropylene and polyethylene terephthalate,
The zeolite is a method of manufacturing a water treatment filter, characterized in that the silver zeolite of 2 ~ 3㎛ in diameter.
The method of claim 4,
The vacuum pressure in the first dehydration step of the fifth step is 50 to 80 cmHg, and the vacuum pressure in the second dehydration step is 10 to 40 cmHg.
The method of claim 3,
The method of manufacturing a water treatment filter, characterized in that the sixth step is pressurized at a pressure of 3 to 7 atmospheres, and in the seventh step, hot air drying is performed at a temperature of 100 to 150°C.
delete

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