KR100929937B1 - Method for producing activated carbon filter for water treatment and activated carbon filter using same - Google Patents

Abstract

The present invention relates to a method for producing activated carbon filter for purifying water and an activated carbon filter using the same. More particularly, the method for preparing activated carbon filter having excellent purification ability by broadening the adsorption surface area by mixing and granulating activated carbon and polyethylene resin. And an activated carbon filter to which the same is applied.

The method for producing an activated carbon filter for water treatment according to the present invention includes a first mixing step of mixing activated carbon powder, a polyethylene resin as a binder, and a granulation step of making porous granules by stirring with heat to the first mixed mixture. And a second mixing step of further mixing the polyethylene resin with respect to the porous granules after the granulation step, a molding step of pressing the second mixed mixture into a molded body, and heating and sintering the molded body after completion of the molding step. Sintering step.

According to the method of manufacturing the activated carbon filter of the present invention and the activated carbon filter using the same, a filter is manufactured by forming activated carbon powder into porous granules having a predetermined size, thereby having a large number of pores and a large surface area, and thus having excellent filtration characteristics and adsorption capacity. Improve your skills.

Purification, water purification, filter, activated carbon, polyethylene, low density polyethylene on line, granule

Description

Manufacturing method of activated carbon filter for water treatment and activated carbon filter using the same {Manufacturing method of activated carbon filter for purifying water and activated carbon filter etc}

The present invention relates to a method for producing activated carbon filters for water treatment and activated carbon filters using the same, and more particularly, to increase the surface area of adsorption by mixing and granulating activated carbon and polyethylene resins for water treatment with excellent purification ability. The present invention relates to a method for producing activated carbon filters and an activated carbon filter using the same.

Water is directly linked to the maintenance of human life and is one of the precious natural resources indispensable in daily life, agriculture, and industrial production.

However, as the living environment is advanced recently, water pollution caused by environmental pollution, especially pollution of drinking water, has emerged as a socially important problem.

In order to solve this problem, a wide range of researches have been conducted on the purification of contaminated water and the treatment of general water for drinking water. For example, retention refers to distillation, ion exchange, chemisorption, filtration, or physical blockage of particulates.

In general, a water purification device for purifying tap water uses a plurality of filters alone or in combination of polymer precipitation filters, activated carbon filters, polymer hollow fibers, or ceramic filters to remove various contaminants or foreign substances.

Among them, activated carbon filter is used to remove odor, taste, and color from tap water. Also, activated carbon filter is used to remove carcinogenic substances such as chlorinated by-products such as hardly decomposable organic substance and trihalomethane (THM: trihalomethane). Its application range is expanding.

A filter using an adsorptive shaped body for use in purifying tap water as a filter unit is known from EP 0253132. The molded body has a problem that the particle surface and pores of a substantial portion of the adsorbent are reduced by adhesion and penetration of the thermoplastic material, thereby lowering the adsorption capacity of the filter.

Korean Patent Publication No. 2001-0010912 discloses an activated carbon filter of a filter assembly for water purification. The filter is used in a state in which the activated carbon is filled and sealed in the container, so that a large space is formed between the granular activated carbon, so that the filling rate is low, and as a result, the water purification ability is lowered. After removing the dust, there is a need to fill the container.

The present invention has been made to improve the above problems, to provide a method for producing an activated carbon filter excellent in filtration characteristics and adsorption capacity by granulating the activated carbon powder to have a lot of pores and a large surface area, and to provide an activated carbon filter using the same There is a purpose.

Another object of the present invention is to provide a method for producing an activated carbon filter using an economical general-purpose resin as a binder and an activated carbon filter using the same.

Method for producing an activated carbon filter for water treatment of the present invention for solving the above object is a first mixing step of mixing the activated carbon powder, polyethylene resin as a binder; and stirring while applying heat to the first mixed mixture A granulation step of making porous granules; and a second mixing step of further mixing polyethylene resin with respect to the porous granules after the granulation step; and a molding step of pressing the second mixed mixture into a molded body; and And a sintering step of heating and sintering the molded body after completion of the molding step.

The polyethylene resin of the first mixing step is mixed 5 to 35 parts by weight based on 100 parts by weight of the activated carbon powder, the polyethylene resin of the second mixing step is mixed 3 to 20 parts by weight based on 100 parts by weight of the porous granules Characterized in that.

The activated carbon powder of the first mixing step is characterized in that it has a particle size of 40 to 250 mesh.

The polyethylene resin is characterized in that the linear low density polyethylene resin.

And the activated carbon filter for water treatment of the present invention for solving the above object is characterized in that it is produced by the above method.

According to the manufacturing method of the activated carbon filter for water treatment of the present invention and the activated carbon filter using the same, the activated carbon powder is formed into porous granules of a predetermined size to prepare a filter, which has many pores and a large surface area, and thus has excellent filtration characteristics and adsorption capacity. This improves the water treatment capacity.

In addition, since the low-density polyethylene, a general-purpose resin, can be used as a binder, manufacturing cost can be reduced, and the activated carbon is blocked to facilitate exchange and maintenance.

Hereinafter, an activated carbon filter for water treatment according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view illustrating a filter unit to which an activated carbon filter according to an embodiment of the present invention is applied, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is a perspective view of an activated carbon filter applied to FIG. 1.

1 to 3, the activated carbon filter of the present invention is applied to a filter unit 10 mounted in the water purifier.

The water purification device passes raw water such as tap water or groundwater through the filter unit 10 to remove various foreign substances or organic matter contained in the raw water and to purify it.

The filter unit 10 is composed of the activated carbon filter 20 and the first and second caps 11 and 13 coupled to both sides of the activated carbon filter 20 of the present invention, respectively. A wrap member 15 is formed on the inner surface of the side surface and the hollow portion 27 to prevent the activated carbon from being detached.

The activated carbon filter 20 of the present invention is manufactured by mixing the activated carbon 21 and the polyethylene resin 23, forming a predetermined shape, and sintering them. The polyethylene resin in the above serves as a binder for bonding the activated carbon powder to each other to form a filter of a certain shape.

Activated carbon has micropores of 2 nm or less, meso pores of 2-50 nm, and macro pores of 50 nm or more, and are formed of carbon, oxygen, and nitrogen. By the presence and porosity of the pores as described above, activated carbon 21 removes various foreign substances, odors, tastes, and colors contained in raw water by filtration and adsorption, and at the same time, chlorine, hardly decomposable organic substances, and trihalomethane (THM). Remove organic substances including carcinogens such as chlorine sterilization by-products such as trihalomethane).

The activated carbon 21 may have a granular form and a powder form. The activated carbon 21 used in the activated carbon filter 20 of the present invention uses a powder form. Especially preferably the activated carbon powder has a particle size of 40 to 250 mesh.

When the particle size of the activated carbon powder is less than 40 mesh, the activated carbon granules are excessively grown in the porous granulation process step to be described later to reduce the adsorption surface area of the filter 20 to lower the water purification capacity. If the particle size of the activated carbon powder exceeds 250 mesh, the particle size is so small that a large amount of polyethylene resin must be added during the porous granulation process. Therefore, the structure becomes very dense during molding, the water permeability of the filter 20 is lowered and the physical filtration capacity is lowered. In addition, the amount of activated carbon per unit volume of the filter 20 is relatively reduced, so that the adsorption capacity is also lowered.

Polyethylene resin used as a binder is a thermoplastic material, mixed with activated carbon and melted to bind the activated carbon to each other.

Preferably, a linear low density polyethylene resin is used as a polyethylene resin.

Linear low density polyethylene (LLDPE) has 5 to 30 short chain branches, a density (g / cm 3) of not less than 0.910 and a density of less than 0.939 with respect to 1000 carbon atoms in the main chain. (g / 10min) It is 0.1-50.

Compared with low density polyethylene (LDPE), linear low density polyethylene has a narrower molecular weight distribution, so there is no long side chain and only short side chain, and short side chain has a short distribution. Compared with good crystallinity, the melting point is high and its melting temperature range is good.

In addition, the molecular weight distribution is similar to the molecular structure of high density polyethylene (HDPE), the melt viscosity is relatively high when heated, the crystallinity is better than the low density polyethylene. Therefore, the linear low density polyethylene is an economical general-purpose resin as a binder in the activated carbon filter of the present invention, and has good processability, formability and strength.

The activated carbon filter 20 is formed into a tubular shape having a hollow portion 27 penetrated in the longitudinal direction therein, and purified while passing raw water from the outer side of the activated carbon filter 20 toward the inner hollow portion.

The activated carbon filter 20 of the present invention having the above configuration has excellent physical filtration characteristics and adsorption capacity. The activated carbon filter 20 is used for physical filtration and adsorption on the surface of various organic substances such as sand, rust, dust, lime particles and suspended solids contained in raw water, and various organic substances such as heavy metals, chlorine and chlorinated by-products. Remove

Adsorption performance is greatly improved as compared with the filter of the structure which filled the activated carbon particle | grains in the container of constant shape.

Meanwhile, as another embodiment of the present invention, silver powder or ceramic powder may be further mixed with activated carbon and a linear low density polyethylene mixture to add functionality to water to be purified. Silver has excellent antibacterial effect, and ceramics are very beneficial to human body by emitting far infrared rays or anions.

Tourmaline and monazite are used as the anion-emitting ceramics, and in addition, noble stones, higerions, and macsumite can be used. Negative ions increase the ionization rate of minerals and the like in the blood to alkalinize the blood, purify the blood, promote the exchange of electrical substances in the cell membrane, activate the metabolism, and quickly discharge the waste products in the body.

As far-infrared radiation ceramics, elvan and ocher are used. In addition, silica minerals such as diatomaceous earth and silica sand, clays of kaolinite, germanium and the like can be used. Far-infrared rays help the discharge of waste and toxic substances in the body, and promote blood circulation and blood liquefaction.

And as an effective ceramic for alkalizing water, dolomite, sepiolite, coral, etc. may be used.

The ceramics may be used alone or in combination, respectively. By adding such ceramics to activated carbon, the antimicrobial action is enhanced with silver, and functions such as far infrared rays and anion emission are provided.

1 and 2 show filter units to which the activated carbon filter 20 of the present invention is applied.

The first cap 13 installed on one side of the activated carbon filter 20 is coupled to seal the hollow portion, and the second cap 11 installed on the other side of the activated carbon filter 20 has a through hole formed at the center thereof. . Accordingly, the water purified by passing through the hollow portion 27 from the outer surface of the activated carbon filter 20 flows out through the through hole of the second cap 11. And the second cap 11 is formed with a screw portion 12 to be detachable and mounted to the water purifier.

Activated carbon filter or filter unit having the above structure is easy to exchange.

The wrap member 15 for preventing detachment of the activated carbon particles has a pore smaller than the size of the activated carbon particles. The wrap member 15 uses natural pulp, such as coconut fiber or manila hemp, which is harmless to the human body. In particular, it is preferable to use a nonwoven fabric made of manila hemp, which hardly decreases in strength even after long time in water and does not generate fine dust.

In another embodiment of the filter unit using the activated carbon filter 20 of the present invention, as shown in FIG. 4, the ceramic ball 17 is filled in the hollow portion of the activated carbon filter 20. In this case, functionality such as far-infrared radiation or anion radiation is added to the filtered water while passing through the activated carbon filter 20.

Hereinafter, a method of manufacturing the activated carbon filter 20 according to an embodiment of the present invention will be described in detail with reference to FIGS. 3 and 5.

First, the linear low density polyethylene resin is first mixed with activated carbon powder. In this case, the activated carbon powder has a particle size of 40 to 250 mesh as described above.

The mixture of the mixed activated carbon powder and the linear low density polyethylene is placed on a pan and stirred while applying heat to make the activated carbon powders adhere to the resin to form porous granules having a predetermined size. This granulation process is very effective in increasing the surface area of activated carbon by allowing the linear low density polyethylene, which is a binder, to be uniformly dispersed among the activated carbon particles during molding.

In addition, through the granulation process, many pores are formed between the mutually bonded activated carbon particles, thereby improving physical filtration ability. In particular, when linear low density polyethylene is used as the binder in the granulation process, the binding property between the activated carbon particles is improved.

The granulation process is performed by mixing 5 to 35 parts by weight of linear low density polyethylene, particularly preferably 20 parts by weight based on 100 parts by weight of activated carbon powder.

When the content of the linear low density polyethylene is less than 5 parts by weight, the size of the granules is small, so that it is difficult to uniformly mix the binder during molding. When the content is over 35 parts by weight, the granules are excessively grown to reduce the surface area of the filter.

When the granulation process is performed at the above content ratio, the size of the granules is 20 to 120 mesh. That is, the granule having a size of 20 to 120 mesh has water permeability and adsorption surface area which effectively improves the water purification capacity.

The activated carbon filter 20 of the present invention, which has undergone the granulation process, exhibits excellent adsorption capacity.

After the granulation process is completed, the linear low density polyethylene is further mixed into the granules. In this case, the linear low density polyethylene that is secondly mixed improves the bondability between the granules and keeps the molded body at a constant mechanical strength during molding and sintering.

The linear low density polyethylene resin mixed secondly is added 3 to 20 parts by weight based on 100 parts by weight of the porous granules.

If the content of the linear low density polyethylene is less than 3 parts by weight, mechanical strength and bonding strength are weakened after sintering, which causes problems of desorbing the activated carbon porous granules.

The solid mixture in which the granules and the linear low density polyethylene are mixed is put into a mold and pressurized by pressing to form a tubular shaped body.

After performing the molding step, the molded body is sintered at 120 to 250 ° C. for 10 to 60 minutes, and then cooled naturally to prepare an activated carbon filter 20.

Hereinafter, a method of manufacturing the activated carbon filter 20 of the present invention will be described through examples. However, the following examples are for explaining the present invention in detail, and the scope of the present invention is not limited to the following examples.

(Example)

20 g of linear low density polyethylene was mixed with 100 g of activated carbon powder having a particle size of 145 mesh, and then heated in a pan for 30 minutes to form a porous granule having a size of 30 mesh while stirring evenly.

13.8 g of linear low density polyethylene resin was further mixed with 120 g of the porous granules to form a press-shaped molded product having an outer diameter of 40 mm, an inner diameter of 20 mm, and a length of 100 mm. The molded product was heated in an oven at 185 ° C. for 35 minutes, sintered, and then naturally cooled to prepare an activated carbon filter.

(Comparative Example)

The preparation was carried out in the same manner as in the above example in order to compare with the regular example, but the granulation step was omitted.

That is, 33.8 g of linear low density polyethylene resin was mixed with 100 g of activated carbon powder having a particle size of 145 mesh, and then sintered by sintering and naturally cooled to prepare an activated carbon filter.

Experimental Example

The free residual chlorine contained in the water passed through the filter of the Examples and Comparative Examples was measured in order to compare the purification ability of the Examples and Comparative Examples of the activated carbon filter of the present invention after the porous granulation process.

At this time, the pressure of the raw water applied to the filter is 1kg / cm ² It was.

The results are shown in Table 1 below. Experimental water of Table 1 is the water passed through the activated carbon filter of the Example, the comparative water is the water passed through the activated carbon filter of the comparative example.

Table 1

division Free residual chlorine (mg / ℓ) Passage amount (ℓ / min) enemy 7.2 - Experimental water Not detected 3 Comparison 1.9 2.3

Looking at the results of Table 1, the amount of chlorine contained in the raw water before the purification treatment was 7.2mg / ℓ, but free residual chlorine was not detected in the experimental water. However, in the case of comparative water, the amount of chlorine of 1.9 mg / l was measured, although it was within 0.1 to 4.0 mg / l of drinking water. This is because the activated carbon filter of the Example has a larger adsorption surface area of the activated carbon than the comparative example, and thus the adsorption capacity is improved.

The amount of water to be purified by passing the raw water through the filter was 3 L / min for experimental water when the raw water was applied at a pressure of 1 kg / cm ² , but 2.3 L for comparative water. This is the result of the activated carbon filter of the embodiment due to the porosity of the granules, in this case it can be seen that the water flow is increased by about 30%.

As described above, the present invention has been described with reference to one embodiment, which is merely exemplary, and those skilled in the art will understand that various modifications and equivalent embodiments are possible therefrom.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1 is an exploded perspective view of a filter unit to which an activated carbon filter according to an embodiment of the present invention is applied,

2 is a cross-sectional view of the filter unit of FIG.

3 is a perspective view of an activated carbon filter applied to FIG. 1,

4 is a perspective view showing another filter unit to which the activated carbon filter of one embodiment of the present invention is applied;

5 is a manufacturing process diagram showing a process of manufacturing an activated carbon filter of an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: filter unit 11: second cap

13: first cap 15: wrap member

17: ceramic ball 20: activated carbon filter

21: activated carbon 23: binder

27: hollow part

Claims (5)

delete In the manufacturing method of the activated carbon filter used for the filter unit for water treatment, A first mixing step of mixing the activated carbon powder and the polyethylene resin as a binder; A granulation step of making porous granules by stirring with heat to the first mixed mixture; A second mixing step of further mixing the polyethylene resin with respect to the porous granules after the granulating step; A molding step of pressing the second mixed mixture into a molded body; And a sintering step of heating and sintering the molded body after completion of the molding step. The polyethylene resin of the first mixing step is mixed with 5 to 35 parts by weight based on 100 parts by weight of the activated carbon powder, The polyethylene resin of the second mixing step is a method for producing an activated carbon filter for water treatment, characterized in that for mixing 3 to 20 parts by weight based on 100 parts by weight of the porous granules. In the manufacturing method of the activated carbon filter used for the filter unit for water treatment, A first mixing step of mixing the activated carbon powder and the polyethylene resin as a binder; A granulation step of making porous granules by stirring with heat to the first mixed mixture; A second mixing step of further mixing the polyethylene resin with respect to the porous granules after the granulating step; A molding step of pressing the second mixed mixture into a molded body; And a sintering step of heating and sintering the molded body after completion of the molding step. Activated carbon powder of the first mixing step is a method for producing an activated carbon filter for water treatment, characterized in that having a particle size of 40 to 250 mesh. In the manufacturing method of the activated carbon filter used for the filter unit for water treatment, A first mixing step of mixing the activated carbon powder and the polyethylene resin as a binder; A granulation step of making porous granules by stirring with heat to the first mixed mixture; A second mixing step of further mixing the polyethylene resin with respect to the porous granules after the granulating step; A molding step of pressing the second mixed mixture into a molded body; And a sintering step of heating and sintering the molded body after completion of the molding step. The polyethylene resin is a method for producing an activated carbon filter for water treatment, characterized in that the linear low density polyethylene resin. An activated carbon filter for water treatment, which is produced by the method of any one of claims 2 to 4.

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