KR20170026997A - Apparatus for purifying water using flat tubular ceramic filter - Google Patents

Apparatus for purifying water using flat tubular ceramic filter Download PDF

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Publication number
KR20170026997A
KR20170026997A KR1020150123354A KR20150123354A KR20170026997A KR 20170026997 A KR20170026997 A KR 20170026997A KR 1020150123354 A KR1020150123354 A KR 1020150123354A KR 20150123354 A KR20150123354 A KR 20150123354A KR 20170026997 A KR20170026997 A KR 20170026997A
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South Korea
Prior art keywords
purified water
ceramic filter
tubular ceramic
flat tubular
filter
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KR1020150123354A
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Korean (ko)
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KR101836073B1 (en
Inventor
황광택
김진호
조우석
박준홍
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한국세라믹기술원
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
    • A61L2/08—Radiation
    • A61L2/10—Ultra-violet radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2068—Other inorganic materials, e.g. ceramics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/06—Tubular membrane modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/08—Flat membrane modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/08—Prevention of membrane fouling or of concentration polarisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0039—Inorganic membrane manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/02—Inorganic material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

Abstract

The present invention relates to an apparatus for purifying water, which comprises: a storage tank to and in which a fluid is supplied and stored; a flat tubular ceramic filter which is disposed in the storage tank; a filter cover which is fitted to face a purified water outlet conduit of the flat tubular ceramic filter so that a surface on which the purified water outlet conduit is exposed is covered and sealed, and which communicates with the purified water outlet conduit so that purified water discharged from the purified water outlet conduit is collected; a purified water discharge conduit which is disposed on one side of the storage tank, and which communicates with the filter cover so that the purified water is discharged; a storage tank cover which covers and seals the top of the storage tank; and a pressure pump which increases pressure inside the storage tank by injecting air into the storage tank; wherein the flat tubular ceramic filter comprises: a body part made of a ceramic material, and configured to have porosity and function to filter out impurities contained in the fluid; and a plurality of purified water outlet conduits each composed of an empty space which functions as a path through which water purified while the fluid is passing through the body part flows. According to the present invention, fluids, such as drinking water, wastewater, sewage, etc., can be efficiently purified, water treatment costs can be reduced, and washing can be easily performed.

Description

[0001] The present invention relates to a water treatment apparatus using a flat tubular ceramic filter,

The present invention relates to an apparatus for purifying water, and more particularly to a water treatment apparatus using a flat tubular ceramic filter capable of effectively purifying a fluid such as drinking water, wastewater, and sewage.

Industrial wastewater and household waste water and wastewater are becoming the main cause of water pollution, and these pollution is the main cause of destruction of natural environment and ecosystem. Therefore, waste water, sewage, etc. need to be purified.

In recent years, there is a need to purify drinking water supplied from waterworks or the like.

The inventors of the present invention have studied a ceramic filter for water treatment that can purify drinking water, wastewater, and wastewater, and have also studied and developed a water treatment apparatus using the ceramic filter for water treatment.

Korean Patent Registration No. 10-1122222

The object of the present invention is to provide a water treatment apparatus using a flat tubular ceramic filter which can efficiently purify fluids such as drinking water, wastewater, and wastewater, has a low water treatment cost, and is easy to clean.

The present invention relates to a storage tank in which a fluid is supplied and stored; A flat tubular ceramic filter disposed in the reservoir; A filter configured to fill the purified water discharging pipe of the flat tubular ceramic filter so as to cover the exposed surface of the purified water discharging pipe so that the sealing is performed and the purified water discharged from the purified water discharging pipe communicates with the purified water discharging pipe, cover; A purified water discharge pipe installed at one side of the storage tank and communicating with the filter cover to discharge purified water; A reservoir cover for covering and sealing the reservoir top; And a pressure pump for increasing the pressure in the reservoir by injecting air into the reservoir, wherein the flat tubular ceramic filter is porous and has a body part for filtering impurities contained in the fluid; And a plurality of purified water outlet pipes having an empty space serving as a passage through which the purified water passes through the body portion.

The body is made of at least one material selected from alumina (Al 2 O 3 ), zirconia (ZrO 2 ), mullite (3Al 2 O 3 .2SiO 2 ) and SiC, which exhibits porosity for filtering out impurities contained in the fluid desirable.

It is preferable that the porosity of the body portion is in the range of 40 to 70%.

The purified water extraction tube is formed to pass from the first surface to the opposite second surface of the flat tubular ceramic filter, and the purified water extraction tube is exposed to the outside through the first surface and the second surface of the flat tubular ceramic filter And the separation distance between the purified water withdrawing pipes may be the same.

And a silver (Ag) coating film for antibacterial may be formed on the outer surface of the body part.

A TiO 2 coating film for hydrophilic or photocatalyst may be formed on the outer surface of the body part.

And a polymer coating film for hydrophobic or hydrophilic property may be formed on the outer surface of the body part.

The polymer coating layer may include at least one material selected from triethoxysilane and 3-mercaptopropyltriethoxysilane which exhibit hydrophilicity.

The polymer coating layer may include at least one material selected from perfluorodecyltriethoxysilane and n-butyl phosphonic acid, which exhibit hydrophobicity.

And an Al 2 O 3 coating layer may be formed on the outer surface of the body portion.

And an SiO 2 coating film for hydrophilic property may be formed on the outer surface of the body part.

Wherein a plurality of the flat tubular ceramic filters are provided in the storage tank and a plurality of filter covers are provided correspondingly to the filter covers, and a cover connector for collecting purified water is provided in communication with each of the filter covers, And may be communicated with the purified water discharge pipe.

The water treatment apparatus may further include a plurality of bubble supply pipes for supplying air or ozone (O 3 ) into the storage tank, and the air supplied to the lower part through the bubble supply pipe may be supplied to the bubble the bubble is formed on the outer surface of the tubular ceramic filter to shake the contaminants on the outer surface of the body of the flat tubular ceramic filter to thereby suppress the reduction of the filtration amount by washing the flat tubular ceramic filter, (O 3 ) can decompose pollutants on the outer surface of the body portion of the flat tubular ceramic filter.

A TiO 2 coating layer may be provided on the outer surface of the body portion of the flat tubular ceramic filter. The water treatment apparatus may further include an ultraviolet lamp for irradiating ultraviolet rays to the flat tubular ceramic filter.

The water treatment apparatus includes a fluid inlet pipe installed at the upper end of the reservoir to supply the fluid to the reservoir; And a supply pump for pumping the fluid and supplying the fluid to the reservoir through the fluid inlet pipe.

The air pumped by the pressure pump is supplied to an upper portion of the reservoir through an air supply pipe. A valve is provided between the pressure pump and the air supply pipe to adjust the flow of air by opening and closing operations. The collected purified water is discharged to the outside through the purified water discharge pipe by the pumping of the pressure pump, and a valve is provided between the filter cover and the purified water discharge pipe to control the flow of the purified water through the opening and closing operation.

(-) by the operation of the pressure pump and the purified water is supplied to the purified water extraction pipe of the flat tubular ceramic filter And the flat tubular ceramic filter may be cleaned in such a manner that the fluid supplied to the purified water extraction pipe is discharged to the storage tank through the body portion.

According to the water treatment apparatus using the flat tubular ceramic filter of the present invention, fluids such as drinking water, wastewater, and wastewater can be efficiently purified, water treatment cost is reduced, washing is easy, and the treatment method is simple.

According to the present invention, an antimicrobial action can be expected by providing a silver (Ag) coating on the outer surface of the body portion of the flat tubular ceramic filter.

In addition, according to the present invention, since the TiO 2 coating film is provided on the outer surface of the body portion of the flat tubular ceramic filter, the antibacterial effect is large due to the large oxidizing power, and odor removal and sterilization are also expected.

In addition, according to the present invention, since the polymer coating film is provided on the outer surface of the body portion of the flat tubular ceramic filter, the oil component introduced together with the fluid can be filtered.

According to the present invention, since the Al 2 O 3 coating film is provided on the outer surface of the body of the flat tubular ceramic filter, microfiltration (MF), ultrafiltration (UF), nanofiltration ) And the like.

1 is a cross-sectional view showing a flat tubular ceramic filter according to an example.
FIG. 2 is a photograph showing a flat tubular ceramic filter according to an example.
3 is a cross-sectional view showing an example of a flat tubular ceramic filter having a silver (Ag) coating film on the outer surface of the body part.
4 is a cross-sectional view showing an example of a flat tubular ceramic filter having a TiO 2 coating film formed on the outer surface of the body part.
5 is a cross-sectional view showing an example of a flat tubular ceramic filter having a polymer coating film formed on the outer surface of the body part.
6 is a cross-sectional view showing an example of a flat tubular ceramic filter in which an Al 2 O 3 coating film is formed on the outer surface of the body portion.
7 and 8 are views schematically showing a water treatment apparatus using a flat tubular ceramic filter according to a preferred embodiment of the present invention.
9 and 10 are photographs showing a water treatment apparatus according to an example.
11 is a view showing an X-ray diffraction (XRD) pattern of a flat tubular ceramic filter manufactured according to an experimental example.
12 is a photograph showing a section of the purified water withdrawal tube exposed in the flat tubular ceramic filter manufactured according to the experimental example.
13A is a scanning electron microscope (SEM) photograph showing an enlarged portion at a magnification of 1000 at a portion indicated by a red circle in FIG. 12. FIG. 13B shows a scanning electron microscope (SEM) FIG. 13C is a scanning electron microscope (SEM) photograph showing an enlarged portion at a magnification of 5000 at a portion indicated by a red circle in FIG. 12, and FIG. It is a scanning electron microscope (SEM) photograph showing an enlarged view.
FIG. 14 is a photograph showing the surface of the body portion in the flat tubular ceramic filter manufactured according to the experimental example.
15A is a scanning electron microscope (SEM) photograph showing an enlarged portion at a magnification of 1000 at a magnification of 1000 in FIG. 14, FIG. 15B is a scanning electron microscope (SEM) FIG. 15C is a scanning electron microscope (SEM) photograph showing an enlarged portion at a magnification of 5000 at a portion indicated by a red circle in FIG. 14, FIG. 15D is a SEM photograph of a portion indicated by a red circle in FIG. It is a scanning electron microscope (SEM) photograph showing an enlarged view.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not. Wherein like reference numerals refer to like elements throughout.

A water treatment apparatus according to a preferred embodiment of the present invention includes: a reservoir to which fluid is supplied and stored; A flat tubular ceramic filter disposed in the reservoir; A filter configured to fill the purified water discharging pipe of the flat tubular ceramic filter so as to cover the exposed surface of the purified water discharging pipe so that the sealing is performed and the purified water discharged from the purified water discharging pipe communicates with the purified water discharging pipe, cover; A purified water discharge pipe installed at one side of the storage tank and communicating with the filter cover to discharge purified water; A reservoir cover for covering and sealing the reservoir top; And a pressure pump for injecting air into the reservoir to increase the pressure in the reservoir.

Wherein the flat tubular ceramic filter is made of a porous material and serves to filter off impurities contained in the fluid; And a plurality of purified water extraction pipes having an empty space serving as a passage through which the purified water flows through the body portion.

The body is made of at least one material selected from alumina (Al 2 O 3 ), zirconia (ZrO 2 ), mullite (3Al 2 O 3 .2SiO 2 ) and SiC, which exhibits porosity for filtering out impurities contained in the fluid desirable.

It is preferable that the porosity of the body portion is in the range of 40 to 70%.

The purified water extraction tube is formed to pass from the first surface to the opposite second surface of the flat tubular ceramic filter, and the purified water extraction tube is exposed to the outside through the first surface and the second surface of the flat tubular ceramic filter And the separation distance between the purified water withdrawing pipes may be the same.

And a silver (Ag) coating film for antibacterial may be formed on the outer surface of the body part.

A TiO 2 coating film for hydrophilic or photocatalyst may be formed on the outer surface of the body part.

And a polymer coating film for hydrophobic or hydrophilic property may be formed on the outer surface of the body part.

The polymer coating layer may include at least one material selected from triethoxysilane and 3-mercaptopropyltriethoxysilane which exhibit hydrophilicity.

The polymer coating layer may include at least one material selected from perfluorodecyltriethoxysilane and n-butyl phosphonic acid, which exhibit hydrophobicity.

And an Al 2 O 3 coating layer may be formed on the outer surface of the body portion.

And an SiO 2 coating film for hydrophilic property may be formed on the outer surface of the body part.

Wherein a plurality of the flat tubular ceramic filters are provided in the storage tank and a plurality of filter covers are provided correspondingly to the filter covers, and a cover connector for collecting purified water is provided in communication with each of the filter covers, And may be communicated with the purified water discharge pipe.

The water treatment apparatus may further include a plurality of bubble supply pipes for supplying air or ozone (O 3 ) into the storage tank, and the air supplied to the lower part through the bubble supply pipe may be supplied to the bubble the bubble is formed on the outer surface of the tubular ceramic filter to shake the contaminants on the outer surface of the body of the flat tubular ceramic filter to thereby suppress the reduction of the filtration amount by washing the flat tubular ceramic filter, (O 3 ) can decompose pollutants on the outer surface of the body portion of the flat tubular ceramic filter.

A TiO 2 coating layer may be provided on the outer surface of the body portion of the flat tubular ceramic filter. The water treatment apparatus may further include an ultraviolet lamp for irradiating ultraviolet rays to the flat tubular ceramic filter.

The water treatment apparatus includes a fluid inlet pipe installed at the upper end of the reservoir to supply the fluid to the reservoir; And a supply pump for pumping the fluid and supplying the fluid to the reservoir through the fluid inlet pipe.

The air pumped by the pressure pump is supplied to an upper portion of the reservoir through an air supply pipe. A valve is provided between the pressure pump and the air supply pipe to adjust the flow of air by opening and closing operations. The collected purified water is discharged to the outside through the purified water discharge pipe by the pumping of the pressure pump, and a valve is provided between the filter cover and the purified water discharge pipe to control the flow of the purified water through the opening and closing operation.

(-) by the operation of the pressure pump and the purified water is supplied to the purified water extraction pipe of the flat tubular ceramic filter And the flat tubular ceramic filter may be cleaned in such a manner that the fluid supplied to the purified water extraction pipe is discharged to the storage tank through the body portion.

Hereinafter, a water treatment apparatus according to a preferred embodiment of the present invention will be described more specifically.

The flat tubular ceramic filter 100 used in the water treatment apparatus according to the preferred embodiment of the present invention filters impurities contained in fluids such as drinking water, wastewater, and wastewater by means of porosity, Lt; / RTI > The flat tubular ceramic filter 100 may have a flat shape as shown in FIGS. The flat tubular ceramic filter 100 includes a body 10 having a porous structure and filtering out impurities contained in fluids such as drinking water, wastewater, and wastewater; a water purifying body And a plurality of purified water outlet pipes 20 each having an empty space serving as a passage through which the water is discharged.

The body 10 of the flat tubular ceramic filter 100 is made of a material exhibiting porosity for filtering impurities contained in the fluid. For example, alumina (Al 2 O 3 ), zirconia (ZrO 2 ), mullite It may be comprised of one or more materials that are selected from (3Al 2 O 3 · 2SiO 2 ) and SiC. The porosity of the body portion 10 is preferably 40% or more (for example, 40 to 70%) in order to effectively filter the impurities contained in the fluid. When the porosity is too low, the filtering efficiency may be low, The strength of the body portion 10 is weakened and can be easily broken or broken. The pore size in the body 10 has an appropriate size depending on the application of the water treatment. For example, it has a pore size of about 0.05 to 10 mu m for use for microfiltration (MF), a size of less than 50 nm for use for ultrafiltration (UF), nanofiltration Lt; RTI ID = 0.0 > (NF). ≪ / RTI > Microfiltration (MF) is mainly used as a constant water and nanofiltration (NF) is mainly used for wastewater treatment.

The plurality of purified water extraction pipes 20 are formed to pass from the first surface of the flat tubular ceramic filter 100 to the second opposite surface. The purified water extraction pipe 20 is formed as an empty space and serves as a passage through which the purified water flows while passing through the body portion 10. [ The purified water extraction pipes 20 are provided apart from each other. And the purified water extraction pipe 20 are preferably the same, but the present invention is not limited thereto. The cross-section of the purified water withdrawal tube 20 in the flattened shape of the flat tubular ceramic filter 100 may have a rectangular shape as shown in FIG. 1, but it is not limited thereto and may have various shapes such as circular, elliptical, pentagonal, Lt; / RTI > The purified water extraction pipe 20 is exposed to the outside through the first surface and the second surface of the flat tubular ceramic filter 100.

As shown in FIG. 3, a silver (Ag) coating 30 may be formed on the outer surface of the body 10 of the flat tubular ceramic filter 100 for antibacterial or the like. It is preferable that the silver (Ag) coating film 30 is not formed in the channel forming the purified water drawing tube 20 but is formed only on the outer surface of the body portion 10. The antimicrobial action can be expected by providing the silver (Ag) coating 30 on the outer surface of the body 10. It is preferable that the silver (Ag) coating film 30 has a thickness of about 10 nm to 5 m.

4, the TiO 2 coating layer 40 may be formed on the outer surface of the body 10 of the flat tubular ceramic filter 100 for hydrophilic or photocatalyst. It is preferable that the TiO 2 coating film 40 is formed only on the outer surface of the body 10 without being formed in the channel forming the purified water drawing tube 20. Since the TiO 2 coating film 40 is provided on the outer surface of the body 10, the antioxidant action is large due to the large oxidizing power, and malodor removal and sterilization can also be expected. The TiO 2 coating film 40 is preferably formed to a thickness of about 100 nm to 10 μm.

5, a polymer coating film 50 may be formed on the outer surface of the body 10 of the flat tubular ceramic filter 100 for hydrophobic or hydrophilic properties. It is preferable that the polymer coating film 50 is formed only on the outer surface of the body 10 without being formed in the channel forming the purified water withdrawal tube 20. Since the polymer coating 50 is provided on the outer surface of the body 10, it is possible to filter the oil component introduced together with the fluid. It is preferable that the polymer coating film 50 has a thickness of about 100 nm to 10 m.

6, a microfiltration (MF), an ultrafiltration (UF) filter of a flat tubular ceramic filter 100 is formed on the outer surface of the body 10 of the flat tubular ceramic filter 100, And an Al 2 O 3 coating film 60 for nanofiltration (NF) may be formed. It is preferable that the Al 2 O 3 coating film 60 is formed only on the outer surface of the body 10 without being formed in the channel forming the purified water drawing tube 20. Since the Al 2 O 3 coating film 60 is provided on the outer surface of the body 10 for use in applications such as microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) It can be suitably used. For example, Al 2 O 3 filtration the pore size of the coating film 60, the micro (microfiltration; MF) in it possible to form according to the application, Al 2 O 3 coating film ultra-filtration for pore sizes of 60 (ultrafiltration; UF ) to be formed for use and, Al 2 O 3 coating layer 60, the pore size of nano-filtration (nanofiltration of; Al 2 O 3 coating film 60 can be formed according to the application of the NF), and such a The pore size can be suitably used for filtering the impurities. The Al 2 O 3 coating film 60 is preferably formed to a thickness of about 100 nm to 10 μm.

Although not shown, an SiO 2 coating film for hydrophilic property may be formed on the outer surface of the body portion 10 of the flat tubular ceramic filter 100. It is preferable that the SiO 2 coating film is formed only on the outer surface of the body 10 without being formed in the channel forming the purified water drawing tube 20. It is preferable that the SiO 2 coating film has a thickness of about 100 nm to 10 탆.

Hereinafter, a method of manufacturing the flat tubular ceramic filter 100 will be described in more detail.

A starting material including at least one powder selected from alumina (Al 2 O 3 ), zirconia (ZrO 2 ), mullite (3Al 2 O 3 · 2SiO 2 ), and SiC and an organic binder for producing the flat tubular ceramic filter Prepare raw materials.

In consideration of porosity, pore size, strength, etc. of the flat tubular ceramic filter 100 to be manufactured, it is preferable to use a powder having an average particle size of about 0.01 to 20 μm.

The binder may be polyvinyl alchol (PVA), polyethylene glycol (PEG), or the like.

A pore-forming agent may be added to the starting material and mixed. Examples of the pore-forming agent include carbon-based materials such as cellulose, polymethylmethacrylate (PMMA), and graphite, and mixtures thereof. The pore-forming agent is preferably added in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the starting material.

The starting materials may be mixed, and the mixing may be performed by a ball milling process or the like. Hereinafter, the mixing process by ball milling will be described in detail. The starting materials are charged into a ball milling machine together with the solvent and mixed. The starting material is mechanically mixed by rotating it at a constant speed using a ball milling machine. The ball used for the ball milling may be a ball made of a ceramic material such as alumina or zirconia. The balls may be the same size or may be used together with balls having two or more sizes. The size of the ball, the milling time, and the rotation speed per minute of the ball miller. For example, the size of the ball may be set in the range of about 1 mm to 50 mm, and the rotational speed of the ball miller may be set in the range of about 50 to 500 rpm. The ball milling is preferably performed for 10 minutes to 48 hours. By ball milling, the starting materials are mixed with a uniform particle size distribution.

The mixed starting material is formed into a desired shape and dried. The molding may be performed by various methods such as extrusion molding, press molding and the like. The flat tubular ceramic filter 100 has a tubular shape including the body portion 10 and the purified water drawing tube 20 by the molding. The drying process is preferably performed in an oven at 60 to 150 캜 for 1 to 48 hours.

The molded product is charged into a furnace such as an electric furnace, and a sintering process is performed. The firing step is preferably performed at a firing temperature of about 1100 to 1600 ° C for about 10 minutes to 48 hours. The firing temperature is preferably raised at a heating rate of 1 to 50 ° C / min. If the heating rate is too slow, the time is long and productivity is deteriorated. If the heating rate is too high, thermal stress is applied due to a rapid temperature rise It is preferable to raise the temperature at the temperature raising rate in the above range. The firing is preferably carried out in an oxidizing atmosphere (for example, oxygen (O 2 ) or air atmosphere). After the firing process is performed, the furnace temperature is lowered to unload the fired product. The furnace cooling may be effected by shutting down the furnace power source to cool it in a natural state, or optionally by setting a temperature decreasing rate (for example, 10 DEG C / min). It is preferable to keep the pressure inside the furnace constant even while the furnace temperature is lowered. In the firing process, the organic material component burns off when the temperature is 300 to 400 ° C., and the firing temperature is higher than the firing temperature of the organic material component. Therefore, when the firing process is completed, the organic material components are all removed, The space where the pore-forming agent is located and the space between the powder and the powder form pores, and the sintered body subjected to the sintering process becomes porous.

A silver (Ag) coating 30 may be formed on the surface of the body 10 for antibacterial and the like on the flat tubular ceramic filter 100 thus manufactured. The silver (Ag) coating 30 may be formed by coating a paste, suspension or colloid containing silver (Ag) powder on the outer surface of the body 10 and heat-treating it at a temperature of about 400 to 700 ° C , And can be formed by vapor deposition. The method of forming the silver (Ag) coating film 30 is well known in general, and thus a detailed description thereof will be omitted. It is preferable that the silver (Ag) coating film 30 is formed only on the outer surface of the body portion 10. For this, the purified water extraction pipe 20 preferably performs a process of forming the clad silver (Ag) coating film 30 with a stopper or the like so that no paste, suspension or colloid is introduced. The silver (Ag) coating film 30 is preferably formed to a thickness of about 10 nm to 5 mu m.

In addition, a hydrophilic film may be formed on the surface of the body 10, or a TiO 2 coating film 40 may be formed for photocatalysis. The TiO 2 coating layer 40 may be formed by coating a coating solution prepared from a paste, suspension or colloid containing a TiO 2 precursor on the outer surface of the body portion 10 and heat-treating the layer at a temperature of about 400 to 1200 ° C , And can be formed by vapor deposition. The TiO 2 precursor may be selected from the group consisting of titanium tetraisoproxide (TTIP, Ti (OC 3 H 7 ) 4 ), titanium methoxide, titanium ethoxide, titanium propoxide titanium propoxide, titanium butoxide, and the like. The method of forming the TiO 2 coating film 40 is well known in the art, and a detailed description thereof will be omitted. The TiO 2 coating film 40 is preferably formed only on the outer surface of the body 10. For this, it is preferable that the purified water extraction pipe 20 is closed with a stopper or the like so as to prevent the introduction of paste, suspension or colloid, and the formation process of the TiO 2 coating film 40 is performed. The TiO 2 coating film 40 is preferably formed to a thickness of about 100 nm to 10 μm.

In addition, the polymer coating film 50 may be formed to form a hydrophobic film or a hydrophilic film on the surface of the body 10. The polymer coating layer 50 may be formed by coating a paste, suspension or colloid containing a polymer on the outer surface of the body portion 10 and coating the outer surface of the body portion 10 for curing at a temperature of about 100-250 < Followed by heat treatment. It is preferable that the polymer coating film 50 is formed only on the outer surface of the body 10. For this, it is preferable that the purified water extraction pipe 20 is closed with a stopper or the like so as to prevent the introduction of paste, suspension or colloid, and the process of forming the polymer coating film 50 is performed. The polymer may be selected from the group consisting of triethoxysilane, 3-mercaptopropyltriethoxysilane and mixtures thereof, which exhibit hydrophilicity, perfluorodecyltriethoxysilane, which exhibits hydrophobicity, n-butyl phosphonic acid, mixtures thereof, and the like. The polymer coating film 50 is formed on the outer surface of the body 10, so that the oil component introduced together with the fluid can be filtered. The polymer coating film 50 is preferably formed to a thickness of about 100 nm to 10 m.

The surface of the body portion 10 is coated with Al 2 O (Al 2 O 3 ) for microfiltration (MF), ultrafiltration (UF), nanofiltration 3 coating film 60 can be formed. The Al 2 O 3 coating film 60 may be formed by coating a paste, a suspension or a colloid containing an Al 2 O 3 precursor on the outer surface of the body portion 10 and performing a heat treatment at a temperature of about 500 to 1300 ° C , And can be formed by vapor deposition. The Al 2 O 3 precursor may be aluminum trisketoxide (Al (OC 4 H 9 ) 3 ), aluminum isopropoxide, Boehmite, and the like. The method of forming the Al 2 O 3 coating film 60 is well known in general, and a detailed description thereof will be omitted. It is preferable that the Al 2 O 3 coating film 60 is formed only on the outer surface of the body portion 10. For this purpose, it is preferable that the purified water extraction pipe 20 is closed with a stopper or the like and a process of forming the Al 2 O 3 coating film 60 so as to prevent the introduction of paste, suspension or colloid. An Al 2 O 3 coating film 60 is formed on the outer surface of the body portion 10 so as to be used for microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) It can be suitably used. For example, the pore size of the Al 2 O 3 coating film 60 to be formed can be formed to suit the use of microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) , And the pore size of the Al 2 O 3 coating film (60) is suitably used for filtering the impurities. The Al 2 O 3 coating film 60 is preferably formed to a thickness of about 100 nm to 10 μm.

In addition, an SiO 2 coating film may be formed on the surface of the body portion 10 of the flat tubular ceramic filter 100. The SiO 2 coating layer may be formed by coating a paste, a suspension or a colloid containing the SiO 2 precursor on the outer surface of the body 10, and heat-treating or depositing the paste at a temperature of about 500 to 1300 ° C. have. The SiO 2 precursor may be TEOS (tetraethly orthosilicate) or the like. The method of forming the Al 2 O 3 coating film 60 is well known in general, and a detailed description thereof will be omitted. The SiO 2 coating film is preferably formed only on the outer surface of the body portion 10. For this, it is preferable that the purified water extraction pipe 20 is closed with a stopper or the like so as to prevent the introduction of paste, suspension or colloid, and the formation process of the SiO 2 coating film is performed. The SiO 2 coating film is preferably formed to a thickness of about 100 nm to 10 μm.

Hereinafter, a water treatment apparatus using the above-described flat tubular ceramic filter 100 will be described.

7 and 8 are views schematically showing a water treatment apparatus using a flat tubular ceramic filter according to a preferred embodiment of the present invention. 9 and 10 are photographs showing a water treatment apparatus according to an example.

7 and 8, the water treatment apparatus includes a reservoir 110 to which fluids such as drinking water, wastewater, and wastewater are supplied and stored, a flat tubular ceramic filter 100 disposed in the reservoir 110, The purified water discharging pipe 20 of the filter 100 is fitted face to face to face the exposed surface of the purified water discharging pipe 20 so that the sealing is performed and the purified water discharging pipe 20 is communicated with the purified water discharging pipe 20, A purified water discharge pipe 140 installed at one side of the storage tank 110 and communicating with the filter cover 130 to discharge the purified water, a storage tank 130 for covering and sealing the upper part of the storage tank 110, And a pressure pump 160 for increasing the pressure in the reservoir 110 by injecting air into the cover 150 and the reservoir 110.

The water treatment apparatus may further include a fluid inlet pipe 120 provided at the upper end of the storage tank 110 to supply a fluid such as drinking water, wastewater, and wastewater to the storage tank 110.

As shown in FIG. 8, a plurality of flat tubular ceramic filters 100 may be provided in the storage tank 110, and a plurality of filter covers 130 may be provided correspondingly. And a cover connector 135 for collecting purified water and communicating with the cover connector 135. The cover connector 135 may be provided to communicate with the purified water discharge pipe 140. [ A plurality of the flat tubular ceramic filters 100 may be arranged and used.

The water treatment apparatus may further include a feed pump 170 for pumping fluid such as drinking water, wastewater, and wastewater from a fluid supply tank 105 and supplying the fluid to the storage tank 110. A valve V1 is provided between the fluid supply tank 105 and the supply pump 170 to adjust the flow of the fluid by opening and closing operations.

The water treatment apparatus may further include a plurality of bubble supply pipes 175 for supplying air or ozone (O 3 ) into the storage tank 110. The bubble supplying pipe 175 may be disposed below the storage tank 110 so as to face the flat tubular ceramic filter 100. The bubble supply pipe 175 may be connected to the pressure pump 160 via a conduit 177 or may be connected to a separate pump (not shown) for supplying air or ozone O 3 , Air or ozone O 3 may be supplied to the lower portion of the storage tank 110 through the bubble supply pipe 175 by pumping the exhaust gas from the exhaust pipe 160 or the like. The air supplied to the lower portion of the storage tank 110 through the bubble supplying pipe 175 forms a bubble 178 and the pollutant on the outer surface of the body portion 10 of the flat tubular ceramic filter 100 The flat tubular ceramic filter 100 is washed to suppress the reduction of the filtration amount. The ozone O 3 supplied to the lower part of the storage tank 110 through the bubble supplying pipe 175 can manifest the effect of decomposing contaminants on the outer surface of the body 10 of the flat tubular ceramic filter 100 . A valve V4 is provided between the bubble supplying pipe 175 and the conduit 177 so that the flow of air or ozone O 3 can be controlled by opening and closing operations.

In addition, the water treatment apparatus may further include a fluid discharge pipe 180 for discharging the fluid in the reservoir 110 to the outside. The fluid discharge pipe 180 is provided with a valve V3 to control the discharge of the fluid by opening and closing operations. The lower part of the reservoir 110 is inclined (i.e., provided to have a slope) so that the untreated fluid collects downward to facilitate discharge through the fluid discharge pipe 180.

When the TiO 2 coating film 40 is provided on the outer surface of the body portion 100 of the flat tubular ceramic filter 100, the water treatment apparatus includes an ultraviolet lamp (not shown) for irradiating ultraviolet rays to the tubular ceramic filter 100, Time). The tubular ceramic filter 100 provided with the TiO 2 coating film 40 can be expected to have a photocatalytic effect by being irradiated with ultraviolet rays by an ultraviolet lamp. When ultraviolet rays are irradiated by the ultraviolet lamp, a photocatalytic reaction occurs on the surface of the TiO 2 coating film 40, and organic matter can be removed. The TiO 2 coating film 40 functioning as a photocatalyst changes the hydroxyl group ion (OH-) obtained through the photolysis of water into a hydroxyl radical for removing the organic material having a poorly decomposing property. Bacteria contained in the fluid are sterilized by ultraviolet lamps and ultraviolet rays are irradiated on the TiO 2 coating film 40 to generate hydroxyl radicals having strong oxidizing power and the organic compounds are oxidatively decomposed by the hydroxyl radicals.

The storage tank cover 150 covers and seals the upper portion of the storage tank 110 and is preferably transparent so that sunlight can be transmitted.

The filter cover 130 is fitted on the purified water discharging pipe 20 of the flat tubular ceramic filter 100 so as to seal the exposed surface of the purified water discharging pipe 20 and to seal the purified water discharging pipe 20 So that the purified water discharged from the purified water discharging pipe 20 can be collected. The filter cover 130 is fitted in contact with the surfaces adjacent to the exposed surface of the purified water drawing tube 20 of the flat tubular ceramic filter 100. The exposed surface of the purified water extraction pipe 20 is spaced apart from the filter cover 130 by a predetermined distance while facing the filter cover 130 and the purified water extraction pipe 20 is communicated with the filter cover 130. The purified water discharged from the purified water extraction pipe 20 is collected by the filter cover 130.

The pressure pump 160 may inject air into the reservoir 110 to increase the pressure in the reservoir 110. The air pumped by the pressure pump 160 may be supplied to the upper portion of the reservoir 110 through the air supply pipe 165. The valves V5 and V8 are provided between the pressure pump 160 and the air supply pipe 165 so that the flow of air can be controlled by opening and closing operations.

The storage tank 110 provides a space for storing the infused drinking water, wastewater, and wastewater. Fluids such as drinking water, wastewater, and wastewater are supplied to the storage tank 110 through a feed pump 170 and the like, and a flat tubular ceramic filter 100 for purifying the fluid is placed in the storage tank 110 do. The inside of the flat tubular ceramic filter 100 becomes a negative pressure by the operation of the pressure pump 160 and the fluid in the reservoir 100 is discharged from the body 10 of the flat tubular ceramic filter 100 The purified water passing through the body 10 flows into the purified water extraction pipe 20 and flows into the purified water extraction pipe 20 20 are collected in the filter cover 130.

The purified water collected in the filter cover 130 is discharged to the outside through the purified water discharge pipe 140. The purified water collected in the filter cover 130 may be discharged to the outside through the purified water discharge pipe 140 by pumping the pressure pump 160. A valve V7 is provided between the filter cover 130 and the purified water discharge pipe 140 to control the flow of the purified water through the opening and closing operation. The purified water discharged from the purified water discharge pipe 140 is supplied to the purified water storage tank 190 and the valve V6 is provided between the purified water discharge pipe 140 and the purified water storage tank 190 to control the flow of the purified water .

The pollutant may be removed by a backwashing method in which the pressure is applied in a direction opposite to the direction in which the filtration is performed when the amount of the contaminant adhered to the flat tubular ceramic filter 100 increases and the filtrate flow rate decreases. The backwashing process can be accomplished as follows. Fluid (purified water) is pumped from the fluid supply tank 105 and supplied to the purified water extraction pipe 20 of the flat tubular ceramic filter 100 through the valves V5 and V7 and the filter cover 130, The ceramic tubular filter 100 is cleaned in such a manner that the fluid supplied to the tubular ceramic filter 20 is discharged through the body portion 10 to the storage tank 110. In this case, it is preferable that the fluid supplied from the fluid supply tank 105 is clean purified water (purified water). When the flat tubular ceramic filter 100 is to be cleaned, it is preferable to perform the cleaning after discharging the fluid in the reservoir 110 through the fluid discharge pipe 180. When the flat tubular ceramic filter 100 is to be cleaned, the inside of the reservoir 110 becomes negative (-) by the operation of the pressure pump 160 as compared with the purified water extraction tube 20, The fluid in the take-out tube 20 flows into the body 10 of the flat tubular ceramic filter 100 and is cleaned while passing through the body 10 and the fluid that has passed through the body 10 flows into the reservoir 110 to be collected.

Hereinafter, experimental examples according to the present invention will be specifically shown, and the present invention is not limited to the following experimental examples.

To prepare a flat tubular ceramic filter, starting materials including alumina (Al 2 O 3 ) powder and polyvinyl alcohol (PVA) as an organic binder were prepared and mixed. The alumina (Al 2 O 3 ) powder used was powder having an average particle size of about 9 μm.

The mixed starting raw material was molded into a flat tubular shape as shown in Fig. 2 by extrusion molding and dried.

The molded product was charged into an electric furnace and subjected to a sintering process. The firing process was performed at a sintering temperature of about 1350 to 1400 캜 for about 1 hour.

The porosity of the body of the flat tubular ceramic filter thus fabricated was 42.01%.

11 is a view showing an X-ray diffraction (XRD) pattern of a flat tubular ceramic filter manufactured according to an experimental example.

Referring to FIG. 11, it can be seen that an Al 2 O 3 crystal phase appears.

12 is a photograph showing a section of the purified water withdrawal tube exposed in the flat tubular ceramic filter manufactured according to the experimental example.

13A is a scanning electron microscope (SEM) photograph showing an enlarged portion at a magnification of 1000 at a portion indicated by a red circle in FIG. 12. FIG. 13B shows a scanning electron microscope (SEM) FIG. 13C is a scanning electron microscope (SEM) photograph showing an enlarged portion at a magnification of 5000 at a portion indicated by a red circle in FIG. 12, and FIG. It is a scanning electron microscope (SEM) photograph showing an enlarged view.

FIG. 14 is a photograph showing the surface of the body portion in the flat tubular ceramic filter manufactured according to the experimental example.

15A is a scanning electron microscope (SEM) photograph showing an enlarged portion at a magnification of 1000 at a magnification of 1000 in FIG. 14, FIG. 15B is a scanning electron microscope (SEM) FIG. 15C is a scanning electron microscope (SEM) photograph showing an enlarged portion at a magnification of 5000 at a portion indicated by a red circle in FIG. 14, FIG. 15D is a SEM photograph of a portion indicated by a red circle in FIG. It is a scanning electron microscope (SEM) photograph showing an enlarged view.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.

10: body portion 20: purified water withdrawal tube
30: silver (Ag) coating film 40: TiO 2 coating film
50: polymer coating film 60: Al 2 O 3 coating film
100: flat tubular ceramic filter 105: fluid supply tank
110: storage tank 120: fluid inlet pipe
130: filter cover 140: purified water discharge pipe
150: reservoir cover 160: pressure pump
165: air supply pipe 170: supply pump
175: Bubble supply pipe 180: Fluid discharge pipe
190: purified water storage tank

Claims (17)

A reservoir to which fluid is supplied and stored;
A flat tubular ceramic filter disposed in the reservoir;
A filter configured to fill the purified water discharging pipe of the flat tubular ceramic filter so as to cover the exposed surface of the purified water discharging pipe so that the sealing is performed and the purified water discharged from the purified water discharging pipe communicates with the purified water discharging pipe, cover;
A purified water discharge pipe installed at one side of the storage tank and communicating with the filter cover to discharge purified water;
A reservoir cover for covering and sealing the reservoir top; And
And a pressure pump for injecting air into the reservoir to increase the pressure in the reservoir,
Wherein the flat tubular ceramic filter is made of a porous material and serves to filter off impurities contained in the fluid; And
And a plurality of purified water outflow pipes having an empty space serving as a passage through which the purified water passes through the body portion.
[2] The method of claim 1, wherein the body is made of a material selected from the group consisting of alumina (Al 2 O 3 ), zirconia (ZrO 2 ), mullite (3Al 2 O 3 .2SiO 2 ) and SiC which exhibit porosity for filtering impurities contained in the fluid. Or more of the material.
The water treatment system according to claim 1, wherein the porosity of the body portion is in the range of 40 to 70%.
2. The ceramic filter according to claim 1, wherein the purified water extraction pipe is formed to pass from a first surface to a second surface opposite to the first surface of the flat tubular ceramic filter,
The purified water extraction tube is exposed to the outside through the first and second surfaces of the flat tubular ceramic filter,
And the separation distance between the purified water withdrawing pipes is the same.
The water treatment system according to claim 1, wherein an Ag coating film for antibacterial is formed on the outer surface of the body part.
The water treatment apparatus according to claim 1, wherein a TiO 2 coating film for hydrophilic or photocatalytic is formed on the outer surface of the body part.
The water treatment apparatus according to claim 1, wherein a polymer coating film for hydrophobic or hydrophilic property is formed on the outer surface of the body part.
[7] The water treatment apparatus according to claim 7, wherein the polymer coating film comprises at least one material selected from triethoxysilane and 3-mercaptopropyltriethoxysilane which exhibit hydrophilicity. .
[8] The method of claim 7, wherein the polymer coating film comprises at least one material selected from perfluorodecyltriethoxysilane and n-butyl phosphonic acid, which exhibit hydrophobicity Water treatment apparatus.
The water treatment apparatus according to claim 1, wherein an Al 2 O 3 coating film is formed on the outer surface of the body portion.
The water treatment apparatus according to claim 1, wherein a SiO 2 coating film for hydrophilic property is formed on the outer surface of the body part.
The ceramic filter according to claim 1, wherein a plurality of the flat tubular ceramic filters are provided in the storage tank,
A plurality of filter covers are provided correspondingly,
And a cover connector for collecting the purified water in communication with each of the filter covers,
And the cover connecting body is provided so as to communicate with the purified water discharge pipe.
The apparatus of claim 1, further comprising a plurality of bubble supply pipes for supplying air or ozone (O 3 ) into the reservoir,
The air supplied to the lower portion of the storage tank through the bubble supply pipe forms a bubble to remove contaminants on the outer surface of the body of the flat tubular ceramic filter to clean the flat tubular ceramic filter, Reduction,
Wherein the ozone (O 3 ) supplied to the bottom of the storage tank through the bubble supply pipe dissolves contaminants on the outer surface of the body of the flat tubular ceramic filter.
The ceramic filter according to claim 1, wherein a TiO 2 coating film is provided on the outer surface of the body portion of the flat tubular ceramic filter,
Further comprising an ultraviolet lamp for irradiating the tubular ceramic filter with ultraviolet light.
2. The apparatus of claim 1, further comprising: a fluid inlet pipe installed at the upper end of the reservoir to supply the fluid to the reservoir; And
Further comprising a supply pump for pumping the fluid and supplying it to the reservoir through the fluid inlet pipe.
2. The apparatus according to claim 1, wherein the air pumped by the pressure pump is supplied to an upper portion of the reservoir through an air supply pipe,
A valve is provided between the pressure pump and the air supply pipe to adjust the flow of air by opening and closing operation.
The purified water collected in the filter cover is discharged to the outside through the purified water discharge pipe by the pumping of the pressure pump,
Wherein a valve is provided between the filter cover and the purified water discharge pipe to control the flow of the purified water through the opening and closing operation.
The method as claimed in claim 1, wherein, when the amount of contaminants attached to the flat tubular ceramic filter increases and the filtrate flow rate decreases,
The inside of the reservoir becomes negative (-) by the operation of the pressure pump,
The purified water is supplied to the purified water extraction pipe of the flat tubular ceramic filter,
Wherein the tubular ceramic filter is cleaned in such a manner that the fluid supplied to the purified water extraction tube is discharged to the storage tank through the body portion.
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KR20190042265A (en) 2017-10-16 2019-04-24 주식회사 엘지화학 Ceramic filter and manufacturing method of the same
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KR20220100140A (en) * 2021-01-07 2022-07-15 한국건설기술연구원 Bubble flotation water treatment system using ultraviolet and ozone microbubbles

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KR102144059B1 (en) 2018-11-16 2020-08-12 한국건설기술연구원 Submerged water treatment and water reservoir system for adjusting siphon driving water level

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Publication number Priority date Publication date Assignee Title
KR20190042265A (en) 2017-10-16 2019-04-24 주식회사 엘지화학 Ceramic filter and manufacturing method of the same
KR101969522B1 (en) * 2017-10-25 2019-04-16 (주)인바이어플랜텍 System for processing heavy metals of industrial wastewater
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KR20220100140A (en) * 2021-01-07 2022-07-15 한국건설기술연구원 Bubble flotation water treatment system using ultraviolet and ozone microbubbles

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