KR102551040B1 - Water filter composition containing diatomite, method for manufacturing diatomite filter, and multi-stage filter device having diatomite filter - Google Patents

Abstract

The present invention relates to a composition for a filter comprising diatomaceous earth and a binder, and in one embodiment, the binder provides a composition for a filter made of a biodegradable polymer. In addition, in one embodiment, diatomaceous earth may be 94 to 99% by weight and the binder may be 1 to 6% by weight in the filter composition.

Description

Filter composition containing diatomite, method for manufacturing diatomite filter, and multi-stage filter device having diatomite filter {Water filter composition containing diatomite, method for manufacturing diatomite filter, and multi-stage filter device having diatomite filter}

The present invention relates to a composition for a filter and a filter manufactured using the same, and more particularly, to a composition for a filter composed of an environmentally friendly material having diatomaceous earth as a main component and an eco-friendly filter using the same.

Currently, physical, chemical, and biological treatment processes are used as methods for treating various sewage, sewage, and wastewater. Among these treatment processes, various types of filters are used to remove or separate pollutants/harmful substances in the treated water.

Conventional filters are often made of materials that cause environmental pollution, such as the filter itself, which is generally made of artificial synthetic resin. However, recently, there has been a rapid increase in the demand for environmentally friendly production of products and disposal of waste products worldwide. Filters are consumables, and waste filters after use must also be treated in an environmentally friendly manner to meet these requirements. In addition, existing filters have excellent performance, but are often costly due to high production costs.

Patent Document 1: Korean Patent Registration No. 10-1668474 (published on October 28, 2016) Patent Document 2: Korean Patent Registration No. 10-0813127 (published on March 17, 2008)

The present invention is to solve the above problems, and an object of the present invention is to provide a filter made of diatomaceous earth, which is a natural material that minimizes environmental pollution, and can be easily manufactured in a desired shape.

According to one embodiment of the present invention, a composition for a filter comprising diatomaceous earth and a binder, wherein the binder is made of a biodegradable polymer, is provided. At this time, in one embodiment, diatomaceous earth may be 94 to 99% by weight and the binder may be 1 to 6% by weight in the filter composition.

According to one embodiment of the present invention, a method for manufacturing a diatomaceous earth filter, comprising the steps of preparing a solution having a concentration of 1% to 8% by dissolving a biodegradable polymer in a solvent; Forming a slurry by mixing diatomaceous earth and the solution in a ratio of 1:2 to 1:4; and molding the slurry into a predetermined shape and drying it.

According to one embodiment of the present invention, there is provided a multi-stage filter device for purifying fluid, comprising: a first chamber at least partially filled with diatomaceous earth; and a second chamber disposed downstream of the first chamber and having at least one diatomaceous earth filter. In addition, each of the diatomaceous earth filters may be made of the above-described filter composition.

In one embodiment of the present invention, the filter composition has diatomaceous earth, which is an environmentally friendly material, as a main component, and a biodegradable polymer that serves as a binder is also an environmentally friendly material, so there is an advantage in that the filter can be discarded without special treatment after use.

In addition, the composition for a filter according to an embodiment of the present invention can be made into a filter shape in a variety of shapes in a slurry or paste state, and can be dried at room temperature, so that a filter can be manufactured easily and conveniently at a low cost.

1 is a flowchart of a method for manufacturing a diatomaceous earth filter according to an embodiment of the present invention;
2 is a diatomaceous earth filter according to an embodiment and a scanning electron microscope (SEM) photograph of the same enlarged;
3 is a view showing the effect of a diatomaceous earth filter according to an embodiment;
4 is a view explaining a multi-stage filter device having a diatomaceous earth filter according to an embodiment;
5 is a view illustrating a multi-stage filter device having a diatomaceous earth filter according to an alternative embodiment;
6 is a diagram illustrating an oil-water separation filter according to an embodiment.

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and the spirit of the present invention will be sufficiently conveyed to those skilled in the art.

In this specification, when an element is referred to as being on another element, it means that it may be directly formed on the other element or a third element may be interposed therebetween.

In this specification, when terms such as first and second are used to describe components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. Embodiments described and illustrated herein also include complementary embodiments thereof.

In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. The expressions 'comprises', 'consists of', and 'consists of' used in the specification do not exclude the presence or addition of one or more other elements in addition to the mentioned elements.

The present invention will be described in detail with reference to the following drawings. In describing the specific embodiments below, various specific details have been prepared to more specifically describe the invention and aid understanding. However, readers who have knowledge in this field to the extent that they can understand the present invention can recognize that it can be used without these various specific details. In some cases, it is mentioned in advance that parts that are commonly known in describing the invention and are not greatly related to the invention are not described in order to prevent confusion in describing the present invention.

According to one embodiment of the present invention, a filter composition for purifying fluid is disclosed. In one embodiment, the filter composition may be prepared by mixing diatomaceous earth and a binder. Diatomaceous earth is a sediment or sedimentary rock formed by accumulation of diatom debris, and is mainly composed of silica (SiO ₂ ), and has good absorption and excellent filtering function due to its high porosity and complex internal structure. In one embodiment of the present invention, diatomaceous earth having a particle size (diameter) of approximately 10 μm to 100 μm is used in the filter composition.

A binder is mixed with diatomaceous earth to prepare a filter composition containing diatomaceous earth as a main component. In one embodiment, the composition for a filter containing diatomaceous earth as a main component may include 94 to 99% by weight of diatomaceous earth and 1 to 6% by weight of a binder.

At this time, for example, a biodegradable polymer may be used as a binder for eco-friendly and room temperature drying. Biodegradable polymers are a general term for polymers that can be degraded by microorganisms, and can be divided into natural polymers and synthetic polymers. Natural polymers include, for example, collagen, fibronectin, gelatin, and chitosan. (chitosan), alginic acid, hyaluronic acid, etc., and synthetic polymers include poly(lactic acid) (PLA), poly(glycolic acid) (PGA), poly(D,L-lactic-co - Glycolic acid) (PLGA) and its similar copolymers, poly(ε-caprolactone) (PCL), polyanhydride, polyorthoester, and hydrogel formed by copolymerization thereof can include In one embodiment of the present invention, a biodegradable polymer made of at least one of the above-described biodegradable polymers may be used as a binder.

As described above, the composition for a filter having diatomaceous earth as a main component and a biodegradable polymer as a binder according to one embodiment can be molded into various shapes at room temperature and can be dried at room temperature, so that a filter can be manufactured by a simple and rapid process. In addition, diatomaceous earth and biodegradable polymers, which are used as the main component and binder in the filter composition, are easy to secure in a natural state and are environmentally friendly materials that are harmless to the human body. and has the advantage of being easy to manage.

The filter made of the above filter composition can remove suspended matter such as various contaminants and harmful substances from the fluid as well as various heavy metals such as lead, mercury, cadmium, zinc, copper, and chromium. If a multi-stage filter is configured by arranging them, the filter effect can be further enhanced.

In addition, the filter composition according to an embodiment of the present invention may further include tannic acid. Since tannic acid has a plurality of hydroxyl groups (-OH) and can react with metal ions, the heavy metal removal efficiency can be increased when tannic acid is further included in the filter composition.

1 is a flow chart showing a method for manufacturing a diatomaceous earth filter from a filter composition containing diatomaceous earth as a main component according to an embodiment of the present invention.

Referring to Figure 1, first, in step (S10), a solution in which a biodegradable polymer is dissolved as a binder is prepared. In one embodiment, the biodegradable polymer may be selected from collagen, fibronectin, gelatin, chitosan, alginic acid, hyaluronic acid, PLA, PGA, PLGA, PCL, polyanhydride, polyorthoester, hydrogel, and combinations thereof. can

In one embodiment, a solution having a concentration of 1% to 8% is prepared by dissolving the biodegradable polymer in a solvent. As a solvent, a volatile organic solvent is used. For example, at least one of acetone, ethanol, methanol, isopropanol, benzene, toluene, and mixed solvents thereof may be used as the solvent.

Next, in step S20, a slurry is formed by mixing diatomaceous earth and a biodegradable polymer solution. In one embodiment, a slurry or paste may be formed by mixing diatomaceous earth and the solution in a weight ratio of 1:2 to 1:4. As the diatomaceous earth used at this time, for example, diatomaceous earth having a particle size (diameter) of 10 μm to 100 μm is used.

After that, in step S30, the slurry or paste is molded into a predetermined shape. For example, it can be molded into a disc shape suitable for a filter or any other arbitrary shape. At this time, since the mixture produced in step S20 is in a dough-like state, it is easy for a user to mold into a complicated arbitrary shape.

For example, in this step, the slurry or paste may be molded by putting it into a container or cast having a predetermined shape. Alternatively, it may be molded to have a specific shape using any molding method such as spin coating or 3D printing.

Thereafter, in step S40, the slurry or paste is dried to complete a diatomaceous earth filter. In general, diatomaceous earth is baked at high temperature to make it into a specific shape, but in the present invention, drying at room temperature is possible. For example, it can be dried by exposing the slurry or paste molded into the predetermined shape at room temperature for 10 minutes or more. Of course, in an alternative embodiment, drying may be performed by high-temperature drying such as a heater or hot air to shorten the drying time.

A diatomaceous earth filter containing diatomaceous earth as a main component can be manufactured through the above steps (S10 to S40), and in an alternative embodiment, a step (S50) of adding tannic acid, for example, can be further performed to increase the heavy metal removal efficiency.

For example, in this additional step (S50), at least a portion of the surface of the diatomaceous earth filter produced in the previous step (S40) is coated with tannic acid. For example, the surface of the diatomaceous earth filter may be coated with tannic acid by at least partially immersing the diatomaceous earth filter in a tannic acid solution.

Alternatively, tannic acid may be added in the step of preparing the slurry (S20) in an alternative embodiment. For example, in the step S20, a slurry or paste may be prepared by mixing diatomaceous earth, the solution, and tannic acid. At this time, in one embodiment, an aqueous solution having a concentration of 0.05% to 0.5% is prepared by dissolving tannic acid in water. At this time, a small amount of metal ions may be added to the aqueous solution of tannic acid to help the tannic acid to be well coated on the diatomaceous earth. Then, a slurry or paste may be formed by mixing diatomaceous earth, the above solution, and an aqueous solution of tannic acid at a weight ratio of 1:2:0.1 to 1:4:0.05, and then passing through steps S30 and S40 to obtain a diatomaceous earth filter can be produced

FIG. 2 shows a diatomaceous earth filter manufactured according to the method of FIG. 1 and a scanning electron microscope (SEM) photograph of the same enlarged. Figure 2 (a) is a photograph of a diatomaceous earth filter manufactured using PCL as a biodegradable polymer, in which the diatomaceous earth filter is formed in a substantially disc shape and the upper surface of the filter is photographed.

Figure (b) is a scanning electron microscope (SEM) photograph of this diatomaceous earth filter. As shown in Figure 2 (b), biodegradable polymer (PCL) between diatomaceous earth particles acts as a binder by connecting diatomaceous earth particles in a long strip shape. It can be seen that

FIG. 3 is a view showing the heavy metal removal effect of the diatomaceous earth filter prepared according to _the method of FIG. 1. The diatomaceous earth filter having a thickness of 100 μm prepared according to the method of FIG. shows the experimental results of copper sulfate removal rate (absorption rate) when passed through. As can be seen from the figure, the concentration of copper sulfate measured after passing through the diatomaceous earth filter according to the present invention decreased to 598 ppm, and thus, it can be seen that the removal efficiency is about 40% or more.

4 shows a multi-stage filter device 100 having a diatomaceous earth filter according to an embodiment.

In one embodiment, the multi-stage filter device 100 is composed of a first chamber 10, a second chamber 20, and a treated water inlet (L1) and an outlet (L2), and the treatment introduced through the inlet (L1). Water (for example, water) passes through the first chamber 10 and the second chamber 20 sequentially and then is discharged through the discharge port L2.

The first chamber 10 is at least partially filled with diatomaceous earth 11, and various contaminant particles such as contaminants and suspended matter can be removed while the treated water passes through the diatomaceous earth 11 in the first chamber 10.

The second chamber 20 is disposed downstream of the first chamber 10, and one or more diatomaceous earth filters may be disposed in multiple stages. In the illustrated embodiment, the first to third diatomaceous earth filters 21, 22, and 23 are spaced apart at predetermined intervals from upstream to downstream and are arranged in three stages. However, in an alternative embodiment, the diatomaceous earth filter may be configured with two or four or more stages.

Each of the diatomaceous earth filters 21, 22, and 23 may be composed of, for example, the filter composition containing diatomaceous earth as a main component described above in this specification, and for example, a diatomaceous earth filter manufactured by the method described above with reference to FIG. 1 can

Separation spaces (S1, S2) of a predetermined interval are formed between each diatomaceous earth filter (21, 22, 23), and when there is a separation space (S1, S2) as described above, each diatomaceous earth filter (21, 22, 23) passes through. One treated water temporarily stays in each of the separation spaces S1 and S2. During this stay, residual heavy metals can be further removed from the treated water.

According to the multi-stage filter device 100 as described above, various contaminant particles are removed while the treated water passes through the first chamber 10, and then the multi-stage diatomaceous earth filters 21, 22, and 23 of the second chamber 20 are used. Heavy metals are removed as they pass through.

In an alternative embodiment, the multi-stage filter device 100 further includes a heating unit 30. The heating unit 30 is disposed on the downstream side of the second chamber 20 and can heat the treated water to a predetermined temperature or higher. Therefore, various VOCs (Volatile Organic Compounds) in the treated water can be removed by heating the treated water to a predetermined temperature while passing through the heating unit 30 .

5 shows a multi-stage filter device 200 with diatomaceous earth filters according to an alternative embodiment.

The multi-stage filter device 200 according to the embodiment of FIG. 5 includes a first chamber 10, a second chamber 20, a third chamber 40, a treated water inlet L1 and an outlet L2, and oil It consists of an outlet (L3).

Since the first chamber 10 and the second chamber 20 correspond to the respective chambers 10 and 20 of the multi-stage filter device 100 described with reference to FIG. 4 and have the same or similar configurations and functions, descriptions thereof will be omitted. . In addition, in the alternative embodiment of FIG. 5, the multi-stage filter device 200 may further include a heating unit 30 on the downstream side, whereby VOCs can be removed from the treated water. ) is the same as

The multi-stage filter device 200 of FIG. 5 is different from the multi-stage filter device 100 of FIG. 4 in that it further includes a third chamber 40 . The third chamber 40 includes an oil/water separation filter 41 for separating oil and water from treated water, and oil and water are separated as the treated water passes through the third chamber 40 .

6 schematically shows an oil-water separation filter 41 according to an embodiment. In one embodiment, the oil-water separation filter 41 may be composed of, for example, the filter composition containing diatomaceous earth as a main component described above in this specification, and may be, for example, a diatomaceous earth filter manufactured by the method described above with reference to FIG. 1 there is. At this time, a part of the surface of the diatomaceous earth filter is composed of a hydrophobic surface 411 having hydrophobicity, and the remaining part is composed of a hydrophilic surface 412 having hydrophilicity.

In order to make a part of the surface of the diatomaceous earth filter a hydrophobic surface 411, for example, a hydrophobic material may be coated on the surface of the diatomaceous earth. The hydrophobic material may be a material having a water contact angle with respect to the surface of 90° or more, preferably 120° or more, and more preferably 130° or more and less than 180°. In one embodiment, the hydrophobic material may include a hydrophobic polymer compound, a wax-based material, or a mixture thereof, and a solution containing such a hydrophobic material may be coated by spray coating or blade coating, or diatomaceous earth or It can be molded by mixing with diatomaceous earth slurry .

In one embodiment, the hydrophobic polymer compound is an olefin-based resin, a vinyl-based resin, a polyester-based resin, a polyurethane-based resin, a polyamide-based resin, a siloxane-based resin, a cellulose-based resin, a polyimide-based resin, a polysulfone-based resin, or a polyether. It may be one or two or more copolymers selected from the group consisting of sulfone-based resins, polyacetal-based resins, and poly(meth)acrylic-based resins.

In one embodiment, the wax-based material may be petroleum-based wax, animal natural wax, vegetable natural wax, synthetic wax, or a mixture thereof, and as a more practical example, the wax-based material may be paraffin wax, microcrystalline wax, beeswax wax, It may be soy wax, palm wax, molda wax, candelilla wax, carnauba wax, polyethylene wax, polypropylene wax, F-T (Fischer-Tropsch) wax, or a mixture thereof, but is not limited thereto.

In order to make a part of the surface of the diatomaceous earth filter into a hydrophilic surface 412, the surface of the diatomaceous earth filter may be treated to have hydrophilic properties. For example, a UVO lamp or plasma may be used to treat the surface of the filter to be hydrophilic. In the case of the UVO method, for example, ultraviolet rays having a wavelength of 184.9 nm and a wavelength of 253.7 nm are irradiated to the surface of the diatomaceous earth substrate to remove organic matter and moisture generated on the surface, and to modify the surface to have hydrophilicity. Alternatively, the filter surface can be made hydrophilic by surface treatment using, for example, atmospheric air plasma, oxygen plasma, or the like.

In this way, if the surface of the oil-water separation filter 41 is divided into a hydrophobic surface 411 and a hydrophilic surface 412, the oil component in the treated water passes through the hydrophobic surface 411 and the water component passes through the hydrophilic surface 412. Therefore, it is possible to separate the oil component and the water component.

On the other hand, in the illustrated embodiment, the hydrophobic surface 411 is shown as being in the center of the diatomaceous earth filter surface and the hydrophilic surface 412 is in the outer region, but this is exemplary and the hydrophobic surface and the hydrophilic surface can be arranged in various forms, , For example, the hydrophobic surface 411 and the hydrophilic surface 412 may be each partitioned in a semicircular shape.

Referring back to FIG. 5, the treated water passed through the first chamber 10 proceeds to the oil-water separation filter 41 of the third chamber 40, and the treated water passes through the third chamber 40 to form oil and Water is separated, the oil component is discharged through the oil discharge port (L3), and the water component is transported to the second chamber (20).

As such, those skilled in the art to which the present invention belongs will understand that various modifications and variations are possible from the description of this specification. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, but should be defined by not only the claims to be described later, but also those equivalent to these claims.

10, 20, 40: chamber
30: heating part
11: diatomaceous earth
21, 22, 23: diatomaceous earth filter
41: oil-water separation filter
100, 200: multi-stage filter device

Claims (12)

A composition for a filter comprising diatomaceous earth, a binder and tannic acid,
The binder is made of a biodegradable polymer, the filter composition. According to claim 1,
In the filter composition, diatomaceous earth is 94 to 99% by weight and the binder is 1 to 6% by weight, the filter composition. According to claim 2,
Wherein the diatomaceous earth has a particle size of 10 μm to 100 μm. delete As a method for producing a diatomaceous earth filter,
Preparing a solution having a concentration of 1% to 8% by dissolving the biodegradable polymer in a solvent;
Forming a slurry by mixing diatomaceous earth and the solution in a ratio of 1:2 to 1:4;
Molding the slurry into a predetermined shape and drying it; and
Method for manufacturing a diatomaceous earth filter comprising the step of coating tannic acid on at least a portion of the surface of the diatomaceous earth filter. According to claim 5,
The diatomaceous earth filter manufacturing method, wherein the diatomaceous earth has a particle size of 10 μm to 100 μm. According to claim 5,
In the step of forming the slurry, the aqueous solution of tannic acid has a concentration of 0.05% to 0.5%, and diatomaceous earth, the solution, and the aqueous solution of tannic acid are mixed in a ratio of 1:2:0.1 to 1:4:0.05, respectively, to form a slurry To do, a diatomaceous earth filter manufacturing method. delete As a multi-stage filter device for purifying fluid,
a first chamber at least partially filled with diatomaceous earth; and
A second chamber disposed downstream of the first chamber and having one or more diatomaceous earth filters;
A multi-stage filter device, wherein each of the diatomaceous earth filters is made of the filter composition according to any one of claims 1 to 3. According to claim 9,
A multi-stage filter device in which the second chamber includes a plurality of diatomaceous earth filters, wherein each diatomaceous earth filter is spaced apart from each other by a predetermined interval in an upstream to downstream direction. According to claim 10,
Disposed on the downstream side of the second chamber and further comprising a heating unit for heating the fluid to a predetermined temperature or higher, the multi-stage filter device. According to claim 10,
Further comprising a third chamber interposed between the first chamber and the second chamber and having an oil-water separation filter,
The multi-stage filter device configured to transfer the water separated from the oil-water separation filter to the second chamber and discharge the oil separated from the oil-water separation filter through an oil discharge port.

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