KR101962675B1 - Filter for water treatment and preparation method thereof - Google Patents

Abstract

The present invention relates to a method for manufacturing a water treatment filter and a filter. More particularly, the present invention relates to a method for manufacturing a water treatment filter comprising the steps of: mixing positive charge additives, glass fibers, binder fibers, cellulose, zeolite powder, and water; and molding the mixture, and to a filter. According to the present invention, various pollutants in the water can be effectively removed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for water treatment,

The present invention relates to a filter for water treatment and a method of manufacturing the same, and more particularly, to a water treatment filter capable of effectively removing not only various pollutants in water but also hardness components by containing a positive charge additive, glass fiber, binder fiber, cellulose and zeolite And a manufacturing method thereof.

The water treatment filter is used to remove various contaminants contained in water. The main elimination mechanism is that the material larger than the pore of the filter does not pass through the filter, and the material smaller than the pore is separated from the contaminant Is removed.

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

The filter can be roughly classified into a reverse osmosis membrane, a nanofiltration membrane, an ultrafiltration membrane, and a microfiltration membrane. The ultrafiltration membrane or the microfiltration membrane has a relatively large pore size, and thus has excellent permeation performance. Reverse osmosis membranes and nanofiltration membranes can remove even very small particles, but they are relatively low in permeation performance and require high pressure to supply water, which results in high maintenance costs such as power and installation costs.

On the other hand, water contains a hardness-inducing substance represented by calcium and magnesium in a dissolved state. In particular, these hard substances are dissolved in groundwater in a large amount. Since high-hardness water forms not only drinking water but also scales in the pipe, industrial waterways are often not suitable.

As described above, the reverse osmosis membrane or nanofiltration membrane has a high maintenance cost, and the chemical agent or the ion exchange resin can be used as an additional facility It is difficult to apply it to a small-scale water treatment product such as a water purifier.

Korean Patent Publication No. 2005-0126143 Korean Patent Registration No. 1470620

It is an object of the present invention to provide a method for manufacturing a water treatment filter capable of effectively removing not only contaminants contained in water but also hardness-inducing substances.

It is another object of the present invention to provide a filter capable of simultaneously removing contaminants contained in water and hardness-inducing substances.

According to an aspect of the present invention, there is provided a method of manufacturing a water treatment filter, comprising: mixing a positive charge additive, glass fiber, binder fiber, cellulose, zeolite powder and water; And molding the molded article.

Herein, the step of mixing the positive charge additive, glass fiber, binder fiber, cellulose, zeolite powder and water comprises the steps of: i) preparing a first mixture by mixing a positive charge additive and water; Ii) preparing a second mixture by mixing glass fiber, water and binder fibers; Iii) preparing a third mixture by mixing water and cellulose; Iv) preparing a fourth mixture by mixing the third mixture prepared in step iii) with the first mixture prepared in step i); V) preparing a fifth mixture by mixing the second mixture prepared in step ii) with the fourth mixture prepared in step iv); (Vi) mixing the zeolite powder with the fifth mixture prepared in step (v) to prepare a raw slurry mixture, and the forming step comprises the steps of: (i) stacking the raw slurry mixture prepared in step (vi) ; And (d) dehydrating the raw slurry mixture laminated on the mesh belt.

Further comprising the steps of: (i) after the step (iii), pressurizing the dehydrated raw slurry mixture with a pressure roller; And x) a step of hot-air drying.

The step (d) may further include: a first dehydration step of reducing pressure at the instant when the raw slurry mixture of step (g) is deposited on the mesh belt; And a second dehydrating step after the first dehydrating step.

Herein, the positive charge additive is at least one selected from the group consisting of polyvinylamine, vinylamine copolymer, vinylamine tertiary copolymer and vinylamine homopolymer, the glass fiber has a diameter of 0.1 to 0.6 탆, The binder fiber is at least one selected from the group consisting of polyethylene, polypropylene and polyethylene terephthalate, and the zeolite preferably has a diameter of 2 to 10 mu m.

In addition, it is preferable that the vacuum pressure in the first dehydration step in step (d) is 50 to 80 cmHg, and the vacuum pressure in the second dehydration step is 10 to 40 cmHg.

Also, it is preferable that the pressurization is performed at a pressure of 3 to 7 atmospheres in the pressing step of the step (a) and at a temperature of 100 to 150 ° C in the hot air drying step of the step (x).

In the step (i), the positive charge part mixes the 15th to 40L and the water 400 to 600L, and in the step ii), 1800 to 3000g of the glass fiber, 400 to 600L of water and 300 to 600g of the binder fiber are mixed, 400 to 600 L of water and 4000 to 6000 g of cellulose are mixed, and in step (vi), 2400 to 6000 g of zeolite powder can be mixed.

The water treatment filter according to the present invention may further comprise at least one positively charged portion selected from the group consisting of polyvinylamine, vinylamine copolymer, vinylamine terpolymer and vinylamine homopolymer; 1800 to 3000 g of glass fibers having a diameter of 0.1 to 0.6 탆; 300 to 600 g of any one or more binder fibers selected from the group consisting of polyethylene, polypropylene and polyethylene terephthalate; Cellulose 4000 to 6000 g; And 2,400 to 6,000 g of a zeolite powder having a diameter of 2 to 10 mu m.

According to the water treatment filter of the present invention having the above-described structure, since the positive charge part contains cellulose, zeolite, and zeolite, various contaminants in the water including the hardness-inducing material can be effectively removed.

In addition, according to the method for producing a water treatment filter according to the present invention, positive charge can be sufficiently formed on the cellulose surface by performing the step of mixing and agitating the positive charge additive agent and the cellulose first and then mixing and stirring the binder fibers, Can be increased.

Further, according to the method for producing a water treatment filter according to the present invention, since the first vacuum reduction dehydration is performed at the moment the raw slurry mixture is laminated on the mesh belt, the load applied to the mesh belt can be reduced, So that a filter having a uniform thickness can be produced.

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. And this does not mean that the technical idea and scope of the present invention are limited.

Also, 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 this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do 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 for producing a water treatment filter according to the present invention includes a step of mixing and molding a positive charge additive agent, glass fiber, binder fiber, cellulose, zeolite powder and water.

The step of mixing the positive charge additive, glass fiber, binder fiber, cellulose, zeolite powder and water comprises the steps of: i) preparing a first mixture by mixing the positive charge additive and water, ii) Preparing a third mixture by mixing water and cellulose, iv) mixing the third mixture prepared in the step iii) with the first mixture prepared in the step i) Preparing a fourth mixture, v) preparing a fifth mixture by mixing the second mixture prepared in step ii) with the fourth mixture prepared in step iv), vi) preparing the fifth mixture prepared in step v) And mixing the zeolite powder with the mixture to prepare the raw slurry mixture.

The forming step may include the steps of: (l) laminating the raw slurry mixture prepared in the step (vi) to a mesh belt; (d) dewatering the raw slurry mixture laminated on the mesh belt; (iii) Pressing with a roller, and x) hot air drying.

Describing the above steps in more detail, step (i) is a step of preparing a first mixture by mixing a positive charge additive and water. At this time, it is preferable that the positive charge additive is mixed at a ratio of 15 to 40 L based on 600 L of water. If the mixing amount of the positive charge additive agent is less than 15 L, the positive charge formed on the fiber surface is insufficient and the ability to remove contaminants is reduced. On the other hand, when the mixing amount exceeds 40 L, the binding force between the fibers is too strong, The additive is preferably mixed in the above ratio.

Here, the positive charge additive may be selected from one or more selected from the group consisting of polyvinylamine, vinylamine copolymer, vinylamine terpolymer and vinylamine homopolymer.

The first mixture having such a blending ratio was stirred in a stirrer at a speed of 1300 to 1800 RPM for 45 to 75 minutes.

Step ii) is a step of preparing a second mixture by mixing glass fiber, water and binder fibers.

At this time, it is preferable to mix the glass fibers at a ratio of 1800 to 3000 g based on 600 L of water and at a ratio of 300 to 600 g of the binder fiber.

When the mixing amount of the glass fiber is less than 1,800 g, the pore of the produced filter is too large and the retention ratio of the zeolite is low. On the other hand, when the glass fiber content exceeds 3,000 g, the fiber amount becomes large, The fibers are preferably mixed in the above ratio. Here, the glass fiber preferably has a diameter of 0.1 to 0.6 mu m and a length of 5 to 50 mu m.

If the amount of the binder fibers is less than 300 g, the fibers may not be entangled with each other. Therefore, the binder fibers may be weak and may be difficult to transfer to the drying furnace. In addition, On the contrary, when the content exceeds 600 g, the content of the glass fibers and cellulose is relatively low, and the function as a filter can not be sufficiently exhibited. Therefore, it is preferable that the binder fibers are mixed in the above ratio.

The second mixture having such a blending ratio was stirred in a stirrer at a speed of 1300 to 1800 RPM for 100 to 140 minutes.

Step iii) is a step of preparing a third mixture by mixing water and cellulose.

At this time, it is preferable that the cellulose is mixed at a ratio of 4000 to 6000 g based on 600 L of water.

When the cellulose amount is less than 4000 g, the zeolite retention ratio is low. On the contrary, when the cellulose amount is more than 6000 g, it is preferable that the cellulose is mixed in the above ratio because the filter is difficult to produce due to pore control and dehydration. Here, the cellulose can be obtained from various herbaceous or neck base materials. For example, the wood fiber can be obtained by a mechanical method such as a grinder, a high-pressure homogenizer, or a microfluidizer.

Preferably, the cellulose has a diameter of 0.1 to 0.6 mu m and a length of 3 to 10 mu m.

The third mixture having such a blending ratio was stirred in a stirrer at a speed of 1300 to 1800 RPM for 100 to 140 minutes.

Step iv) is preferably a step of preparing the fourth mixture by mixing the third mixture prepared in the step iii) with the first mixture prepared in the step i), and stirring is preferably carried out under the same conditions as in step iii).

Step v) is preferably a step of preparing the fifth mixture by mixing the fourth mixture prepared in the step iv) with the second mixture prepared in the step ii), and the mixture is preferably stirred under the same conditions as the step i).

The first mixture, the second mixture and the third mixture prepared in the step i) to the step iii) are not mixed together, and in the step iv) the first mixture and the third mixture are first mixed and then the fourth mixture is prepared To prepare the fifth mixture is to maximize the formation of positive charges on the cellulose surface. That is, when the first mixture containing the positive charge additive agent and the third mixture containing cellulose are mixed and stirred first, a positive charge is formed on the cellulose surface, but the first mixture, the second mixture and the third mixture are mixed at once, , The second mixture and the third mixture are sequentially mixed, the positive binder is not sufficiently formed on the cellulose surface due to the binder fiber of the second mixture.

 Step vi) is a step of preparing the raw slurry mixture by mixing the zeolite powder with the fifth mixture prepared in the step (v).

At this time, the zeolite powder is preferably mixed with the prepared fifth mixture at a ratio of 2400 to 6000 g, and the mixture is stirred at a speed of 1300 to 1800 RPM for 20 to 40 minutes.

If the mixing amount of the zeolite powder is less than 2400 g, the ability to remove the hard material is lowered. On the contrary, when the mixing amount exceeds 6000 g, the basis weight and thickness of the filter are unnecessarily increased. The zeolite preferably has a diameter of 2 to 10 mu m. If the diameter of the zeolite is less than 2 mu m, the diameter of the zeolite is too small to cause the voids of the filter to become too small. On the contrary, if the diameter exceeds 10 mu m, the diameter is too large and the hardness material is not sufficiently removed.

The reason for mixing the zeolite powder in the preparation of the raw slurry mixture is to prevent clogging of the surface of the zeolite by the binder fiber.

The step (b) is a step of laminating the raw slurry mixture prepared in the step (vi) to the mesh belt, and for example, the manufacturing apparatus shown in FIG. 2 may be used.

Specifically, the raw slurry mixture prepared in step vi) is transferred to the hopper 100 by a pump (not shown), and the injection nozzle 110 connected to one side of the hopper 100 is connected to the mesh The raw slurry mixture is sprayed onto the belt (200).

Here, it is preferable that the injection nozzle 110 of the hopper 100 is located inside the head box 300 which is isolated from the outside and forms a separate space.

Step (d) is a step of dewatering the slurry mixture, which is laminated on the mesh belt 200, and may include a first dewatering step and a second dewatering step.

Specifically, in the first dehydration step, as soon as the raw slurry mixture of step (iii) is laminated on the mesh belt 200, the first dehydration step The device 310 may be dehydrated, preferably with a vacuum pressure of 50-80 cmHg.

When the primary slurry mixture is deposited on the mesh belt 200 at the moment of the first vacuum degassing, the load applied to the mesh belt 200 can be reduced, and the maintenance cost of the apparatus can be reduced, Since the fibers are bonded by dewatering, even if the mesh belt 200 is slightly inclined, the laminated raw slurry mixture is maintained as it is, and a filter having a uniform thickness can be obtained.

The second dewatering step further lowers the moisture content of the first dewatered raw slurry mixture and induces the bonding between the fibers more densely. The second dewatering step further comprises a second dewatering dewatering device 400 located behind the first dewatering device 310 ), And it is preferable to perform dehydration under reduced pressure with a vacuum pressure of 10 to 40 cmHg, although natural gravity type is possible.

Step (iii) is a step of pressurizing the dehydrated raw slurry mixture. The dehydrated raw slurry mixture on the upper part of the mesh belt 200 is conveyed to a pair of pressure rollers 500 spaced apart at a predetermined interval and pressed.

X) is a hot air drying step. It is preferable to perform hot air drying in the drying apparatus 600, which is maintained at a temperature of 100-150 캜, as a step of completely drying some residual moisture in the dewatering step to obtain a filter.

Thereafter, the slurry can be taken up by the winding device 700 as necessary. Further, the step of further laminating the slurry mixture to the mesh belt, the dehydration step, and the pressurized step hot air drying step can be repeatedly carried out.

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

600 L of water and 15 to 40 L of polyvinylamine were mixed and stirred and 600 L of water, 2000-3000 g of glass fiber and 300-600 g of polyethylene were mixed and stirred to prepare a second mixture. Separately, 600 L of water and 4000 to 5500 g of cellulose were mixed and stirred to prepare a third mixture, and then the first mixture and the third mixture were mixed and stirred to prepare a fourth mixture.

Then, the fourth mixture and the second mixture were mixed and stirred to prepare a fifth mixture, and then to the fifth mixture, 3000 to 6000 g of zeolite powder were mixed to prepare a raw slurry mixture.

The raw sludge mixture thus prepared was sprayed into a mesh belt using the apparatus shown in Fig. 2, and then dehydrated, pressurized and hot-air dried to prepare a filter.

Example Glass fiber
(g) cellulose
(g) Binder fiber (g) Polyvinylamine
(L) Zeolite
(g) One 3000 5500 300 15 6000 2 3000 5500 300 20 6000 3 3000 5500 300 25 6000 4 3000 5500 300 30 6000 5 3000 5500 300 35 6000 6 3000 5500 300 40 6000 7 2000 4000 600 15 3000 8 2000 4000 600 20 3000 9 2000 4000 600 25 3000 10 2000 4000 600 30 3000 11 2000 4000 600 35 3000 12 2000 4000 600 40 3000

Test Example

The flow rate, zeta potential, particle removal rate, hardness removal rate and the like were examined in order to evaluate the performance of the filter manufactured under the conditions of Table 1 above.

Example Basis weight
(g / m ² ) thickness
(mm) pore
(탆) Zeta potential
(mV) flux
(LPM) Particle removal
(1 탆) Hardness removal rate
(%) One 279 0.88 0.91 8.3 1.93 99.93 43 2 287 0.86 0.89 11.2 1.9 99.95 41 3 293 0.89 0.87 14.8 1.87 99.97 41 4 295 0.93 0.84 15.9 1.85 99.99 53 5 302 0.96 0.82 17.2 1.78 99.96 55 6 312 0.95 0.81 18.5 1.75 99.95 54 7 265 0.99 1.23 10.6 2.45 99.82 26 8 268 0.99 1.01 12.7 2.32 99.87 25 9 277 One 0.98 15.2 2.30 99.86 27 10 279 1.13 0.97 17.3 2.28 99.92 38 11 283 1.09 0.95 19 2.26 99.93 37 12 285 1.1 0.93 22.3 2.23 99.99 37

The higher the amount of feedstock and zeolite content, the higher the amount of zeolite added.

In the case of the pores, it was found that the zeta potential was 15.9 to 18.5 mV, which is the smallest in the examples 4 to 6, which is 0.81 to 0.84 탆, which is relatively high.

In the case of the flow rate, in Examples 7 to 12, 2.23 to 2.45 LPM was irradiated, and comparatively good permeation yield was evaluated. However, the particle removal ability of 1 mu m was not only lower than those of Examples 1 to 6 but also too thick, 4 to 6, high hardness removal rates of 53 to 55% were obtained. On the other hand, the filters prepared under the conditions of Examples 7 to 9 had hardness removal rates of less than 30%.

3 is a photograph of a filter manufactured under the condition of Example 5 of the present invention.

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and equivalents thereof are to be construed as being included in the present invention.

100: Hopper
110: injection nozzle
200: mesh belt
300: Head box
310: First decompression dewatering device
400: Second decompression dehydrator
500: pressure roller
600: Drying device
700: retractor

Claims (9)

Mixing positive charge additives, glass fibers, binder fibers, cellulose, zeolite powder and water; And molding,
The step of mixing the positive charge additive, glass fiber, binder fiber, cellulose, zeolite powder and water,
I) preparing a first mixture by mixing a positive charge additive and water;
Ii) preparing a second mixture by mixing glass fiber, water and binder fibers;
Iii) preparing a third mixture by mixing water and cellulose;
Iv) preparing a fourth mixture by mixing the third mixture prepared in step iii) with the first mixture prepared in step i);
V) preparing a fifth mixture by mixing the second mixture prepared in step ii) with the fourth mixture prepared in step iv);
Vi) mixing the zeolite powder with the fifth mixture prepared in the step (v) to prepare a raw slurry mixture,
Wherein the forming comprises:
(D) laminating the raw slurry mixture prepared in the step (vi) into a mesh belt; And
(D) dehydrating the raw slurry mixture laminated on the mesh belt.
delete The method according to claim 1,
After the step (e)
(Iii) pressurizing the dehydrated raw slurry mixture with a pressure roller; And
X) a step of hot-air drying.
The method according to claim 1,
The step (d) may include: a first dehydrating step of reducing the pressure of the raw slurry mixture in the step (b); And
And a second dehydrating step after the first dehydrating step.
The method according to claim 1,
Wherein the positive charge additive is at least one selected from the group consisting of polyvinylamine, vinylamine copolymer, vinylamine terpolymer and vinylamine homopolymer,
The glass fiber has a diameter of 0.1 to 0.6 탆,
Wherein the binder fiber is at least one selected from the group consisting of polyethylene, polypropylene and polyethylene terephthalate,
Wherein the zeolite has a diameter of 2 to 10 占 퐉.
5. The method of claim 4,
Wherein the vacuum pressure in the first dehydration step in step (d) is 50 to 80 cmHg, and the vacuum pressure in the second dehydration step is 10 to 40 cmHg.
The method of claim 3,
Wherein the pressurization is performed at a pressure of 3 to 7 atmospheres in the pressurization step and at a temperature of 100 to 150 DEG C in the hot air drying step in the step x).
The method according to claim 1,
In the step (i), the positive charge portion is mixed with the 15th to 40L and the water 400 to 600L,
In the step (ii), 1800 to 3000 g of glass fiber, 400 to 600 L of water and 300 to 600 g of binder fiber are mixed,
In the step iii), 400-600 L of water and 4000-6000 g of cellulose are mixed,
Wherein in step (vi), 2400 to 6000 g of zeolite powder is mixed. delete

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