KR101750256B1 - a functional filtering sand and the sand filtering device using thereof - Google Patents
a functional filtering sand and the sand filtering device using thereof Download PDFInfo
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- KR101750256B1 KR101750256B1 KR1020150130448A KR20150130448A KR101750256B1 KR 101750256 B1 KR101750256 B1 KR 101750256B1 KR 1020150130448 A KR1020150130448 A KR 1020150130448A KR 20150130448 A KR20150130448 A KR 20150130448A KR 101750256 B1 KR101750256 B1 KR 101750256B1
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- Prior art keywords
- sand
- glass
- filtration apparatus
- water
- present
- Prior art date
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- 239000004576 sand Substances 0.000 title claims abstract description 72
- 238000001914 filtration Methods 0.000 title claims abstract description 65
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 91
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 52
- 239000011521 glass Substances 0.000 claims abstract description 48
- 238000009287 sand filtration Methods 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000010791 quenching Methods 0.000 claims abstract description 13
- 230000000171 quenching effect Effects 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000006060 molten glass Substances 0.000 claims abstract description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 6
- 238000012216 screening Methods 0.000 claims abstract description 6
- 238000004090 dissolution Methods 0.000 claims abstract description 5
- 239000008187 granular material Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 6
- 238000011001 backwashing Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000001223 reverse osmosis Methods 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- 239000012798 spherical particle Substances 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000003403 water pollutant Substances 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 9
- 230000005465 channeling Effects 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 239000013618 particulate matter Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000010922 glass waste Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000005476 size effect Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
-
- B01D23/16—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
- B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
- B01D24/12—Downward filtration, the filtering material being supported by pervious surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/48—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration
- B01D24/4807—Handling the filter cake for purposes other than regenerating
- B01D24/4815—Handling the filter cake for purposes other than regenerating for washing
-
- 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
-
- 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
- B01D39/2003—Glass or glassy material
-
- B01F1/00—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Food Science & Technology (AREA)
- Filtering Materials (AREA)
Abstract
The present invention relates to a sand for a filtration apparatus and a sand filtration apparatus using the same. More specifically, the present invention provides a sand for a special filtration apparatus manufactured artificially, and is capable of removing various water pollutants such as dissolved and suspended To sand and sand filtration devices for functional filtration devices.
The present invention relates to a method for manufacturing sand used in a sand filtration apparatus,
A step of dissolving the glass raw material in a temperature range of 850 to 1800 캜,
A step of quenching the molten glass mass in water at room temperature after the dissolution process,
A step of crushing a glass lump that has undergone the above-mentioned quenching process into a crusher 10,
A screening process of sorting the crushed glass by size after the crushing process,
The present invention also provides a method of manufacturing sand for use in a sand filtration apparatus, which comprises a step of spheroidizing crushed grains by a heating apparatus that slowly heats and gradually slowly heats after being heated and then slowly cooled after the crushing process.
The present invention also provides a method of manufacturing sand for use in a sand filtration apparatus, which comprises mixing and dissolving a silica component (SiO 2 ) in a glass raw material.
The present invention also provides sand for use in the functional sand filtration apparatus manufactured as described above.
The present invention may also be applied to a filtration apparatus comprising a main body 110 of a filtration apparatus, a sand filter medium layer 120, a treated water inflow section 130, a treated water outflow section 140, a backwash section 150, (100) comprising a filter (170).
In the present invention, the sand filter medium layer (120)
A process of dissolving the glass raw material in a temperature range of 850 to 1300 캜,
A step of quenching the molten glass mass in water at room temperature after the dissolution process,
A step of crushing a glass lump that has undergone the above-mentioned quenching process into a crusher 10,
A screening process of sorting the crushed glass by size after the crushing process,
Characterized in that the sand for the functional filtration device is manufactured by a method comprising the step of sphericalizing the crushed granules by a sphericalizing device which is heated and slowly cooled in a heating furnace which is slowly heated and gradually cooled after the crushing process Device 100 is provided.
Description
The present invention relates to a sand for a filtration apparatus and a sand filtration apparatus using the same. More specifically, the present invention provides a sand for a special filtration apparatus manufactured artificially, and is capable of removing various water pollutants such as dissolved and suspended To sand and sand filtration devices for functional filtration devices.
Generally, the water treatment method using sand filtration method forms a sand layer of a certain depth by using sand particles as a filter medium, and passes contaminated water through the sand layer by slow filtration and rapid filtration by gravity, It is a filtration method using sand that is used in waterworks, factories, buildings, rivers, ponds, lakes, reservoirs, etc. to remove particulate matter.
However, in this water treatment method by sand filtration method, it is possible to remove particulate matter by forming a pore by just sand particle layer to filter out floating matters or impurities on the pores of the filter medium layer. It is possible to remove particulate matter, It was difficult to remove dissolved nutrients such as phosphorus (P).
Especially, these nutrients are likely to pollute the water due to abnormal growth of algae even if they are eluted in a small amount in a lake or a pond. As these nutrients increase and the eutrophication accelerates, the water quality of lake and pond rapidly deteriorates.
Therefore, the sand filtration system adopts downflow filtration and upflow filtration system and focuses on developing a filtration device to improve the removal efficiency of various water pollutants.
As a result of the above efforts, a sand filtration layer is formed inside the "UP-DYNAMIC SAND FILTER" (registered trademark) 10-0501522, and the raw water passing through the sand filtration layer is moved upward, A distributor for spraying the raw water introduced into the filtration tank through the inlet pipe to the sand filtration layer, and a distributor for discharging the raw water introduced into the inlet pipe An air lift tube vertically installed in the filtration tank and formed in the shape of a double pipe so as to raise the contaminated sand by spraying the air supplied from the air compressor downward; A cleaning water chamber for collecting washing water that has been sandwiched by the first-order sand through the air-flow tube; A washing water pipe whose one end is connected to the chamber to discharge the treated water and the other end is connected to the outside; and a zigzag type flow path which is located below the washing water chamber and which secondarily measures the first- And the zigzag-type channel is provided with a sand cleaning part having a lower outer diameter than that of the upper part.
The present invention relates to a sand for a functional filtration apparatus and a sand filtration apparatus using the sand for a functional filtration apparatus, wherein the sand used in the sand filtration apparatus is artificially manufactured by using a glass component and the durability is increased by making the particle size uniform and increasing the strength and hardness do.
The present invention relates to a sand filter for a functional filtration device having a filtration efficiency remarkably improved by minimizing the problems such as channeling occurring in the sand filtration due to the uniform particle size of the artificial sand using the above-mentioned glass component and high strength and hardness, Device.
The present invention also relates to a sand filter for a functional filtration device which improves the efficiency of the filtration device by facilitating the supply of sand used in the sand filtration device by using artificial sand using a glass component in the sand filtration device, ≪ / RTI >
In order to solve the above problems and needs,
A method for producing sand for use in a sand filtration apparatus,
A step of dissolving the glass raw material in a temperature range of 850 to 1800 캜,
A step of quenching the molten glass mass in water at room temperature after the dissolution process,
A step of crushing a glass lump that has undergone the above-mentioned quenching process into a
A screening process of sorting the crushed glass by size after the crushing process,
The present invention also provides a method of manufacturing sand for use in a sand filtration apparatus, which comprises a step of spheroidizing crushed grains by a heating apparatus that slowly heats and gradually slowly heats after being heated and then slowly cooled after the crushing process.
The present invention also provides a method for manufacturing sand for use in a sand filtration apparatus, which comprises the step of adding and dissolving a silica component (SiO 2 ) to a glass raw material.
The present invention also provides sand for use in the functional sand filtration apparatus manufactured as described above.
The present invention may also be applied to a filtration apparatus comprising a
In the present invention, the sand filter medium layer (120)
A step of dissolving the glass raw material in a temperature range of 850 to 1800 캜,
A step of quenching the molten glass mass in water at room temperature after the dissolution process,
A step of crushing a glass lump that has undergone the above-mentioned quenching process into a
A screening process of sorting the crushed glass by size after the crushing process,
Characterized in that the sand for the functional filtration device is manufactured by a method comprising the step of sphericalizing the crushed granules by a sphericalizing device which is heated and slowly cooled in a heating furnace which is slowly heated and gradually cooled after the
The sand for the functional filtration apparatus and the sand filtration apparatus using the same according to the present invention exhibit a uniform particle size effect and a remarkably high durability such as strength and hardness by using sand reinforced with a glass component.
The sand for a functional filtration apparatus and the sand filtration apparatus using the same according to the present invention have a uniform particle size of artificial sand and a high strength and hardness, thereby minimizing problems such as channeling occurring in sand filtration, thereby remarkably improving filtration efficiency.
As the artificial sand reinforced with a glass component is used in the sand filtration apparatus of the present invention, the effect of facilitating the supply of sand used in the sand filtration apparatus is also created.
1 is a conceptual view of a sand filtration apparatus according to the present invention.
2 is a conceptual view of an embodiment of a crusher according to the present invention.
3 is a conceptual diagram of an embodiment of a sphericalization apparatus according to the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The present invention relates to a filtration apparatus comprising a
The
Therefore, the present invention is a concept including not only the above-described downflow type but also any other type of sand filtration apparatus.
The filtration apparatus
The technical feature of the present invention resides in the sand
Accordingly, the present invention provides sand for a functional filtration device.
The above-described sand for the functional filtration apparatus of the present invention has a high strength and is resistant to abrasion, thereby enhancing the life of the filter medium.
In addition, since the sand for the functional filtration apparatus of the present invention can form the sand particle size to have a constant size, the porosity of the filter medium layer is kept constant, thereby preventing channeling during filtration, thereby maximizing the filtration efficiency.
The sand for a functional filtration apparatus according to the present invention is characterized by being manufactured by the following method.
The glass raw material is melted in a temperature range of 850 to 1800 캜.
The above glass raw material is a concept including quartz, general glass, glass bottle, glass waste and the like.
This process is also a conventional glass melting step, as is the temperature range.
A technical feature of the present invention is that a process of mixing and dissolving a silica component (SiO 2 ) in the above glass raw material is performed.
In the present invention, 10 to 100 parts by weight of a silica component (SiO 2 ) is mixed and dissolved in 100 parts by weight of the glass raw material.
In general, the filtration sand used in the sand filtration is about 10% or less of silica (SiO 2 ) contained in the maximum amount of sand, because the iso-electric point of silica is pH 2.5, At pH 2.5, the silica has a (+) charge and has an aluminum salt (+) charge in the treated water, so that the effect of adsorption is significantly lowered and the filtration efficiency is significantly lowered. However, such a low pH operation is usually exceptional, but the charging characteristics of silica at pH below 2.5 can be used as an indicator of the filtration characteristics of sand used for sand filtration.
Accordingly, in the present invention, 10 to 100 parts by weight of a silica component (SiO 2 ) is mixed and dissolved in 100 parts by weight of a glass raw material, so that the iso-electric point of silica is pH 2.5. (-) charge, so that the aluminum salt in the treatment water having a (+) charge is adsorbed on the sand for the above-mentioned functional filtration device, So as to perform the function of significantly improving the filtration efficiency.
With this function, even if the aluminum salt (aluminum hydroxide, coagulated flake) reaches the carryover state, the metal salt will have the power to retard the metal salt. The sand for the functional filtration device reinforced with such a silica component can maximize the filtration efficiency.
In addition, if the sand for the functional filter device reinforced with the silica component of the present invention is provided with about 1 to 2 stages of auxiliary material (bead layer) when used in purified water, Iron, and manganese.
Also, a process of quenching the molten glass mass in water at room temperature after the dissolving process is performed.
The above procedure is to make the glass in the dissolved state be in a room temperature and to have cracks as a preliminary step of crushing. Also, at this time, the melted glass has a proper size and is about the size of a softball and weighs about 5 Kg. Or more, the effect of quenching to the center of the molten glass can not be obtained and the glass lump can not be cracked.
This process results in a significant increase in the strength of the glass lumps.
The glass lumps that have undergone the quenching process are put into the
The crusher may be a conventional crusher.
2, the
A rubber stud S1 is fixed to a lower upper surface of the base plate P1 and a treatment plate P2 is fixed to the
After the crushing process, a screening process for sorting crushed glass by size is performed.
This process is selected by a conventional sorting device, such as a vibratory conveyor with holes per grain size, and transferred to the conveying conveyor and transferred to the next step of heating spheroidization.
The size of the above granules can be set differently according to the rapid filtration apparatus or the slow filtration apparatus. In the case of the rapid filtration apparatus, the uniformity coefficient is set to be equal to or smaller than 1.7 and equal to or less than 0.7 mm. .
After the above process, the process of spheroidizing the crushed grains is performed by the sphericalizing device 40 which performs the heating and slow cooling in the heating furnace which is slowly heated and slowly cooled.
The sphericalizing device 40 of the present invention means an apparatus or means for melting and sphering the rough surface of the glass crumb grains by the
As shown in FIG. 3, the present invention includes a conveying
Therefore, the above-described
The driving of the sphericalizing device is performed by moving the conveying
Therefore, the crushed glass grains are heated at a temperature of 300 to 400 캜 under the heating furnace at the initial entry of the conveying heating furnace (30), maintained at a peak temperature of about 1000 to 1800 캜, and the temperature at which the glass grains exit the heating furnace The atmosphere is made to be about 500 to 600 ° C, and the sharp portions of the fracture surfaces of the glass grains are melted to perform spherical function.
In addition, the glass particles are polished by the polishing apparatus after the above-mentioned process, so that they are made of artificial sand filter material.
The polishing process may use a conventional polishing apparatus such as a high-speed centrifugal barrel, and the polishing apparatus has a function of polishing the spherical glass grains according to the use or treating the spherical glass grains as a glass surface.
The present invention, which is manufactured in the above-described manner, has a variety of forms such as gravel or sand, and can be mass-produced as an automated manufacturing stage by transferring a conveyor, So that it is possible to keep the porosity of the filter medium layer constant, thereby preventing channeling during filtration and maximizing the filtration efficiency.
The treatment
Accordingly, the treated
The treated
The
Therefore, the
The backwash
The backwash
The
The present invention provides sand for a functional filtration apparatus having the above-described structure and function and a sand filtration apparatus using the same.
INDUSTRIAL APPLICABILITY The present invention is very useful for industries that produce, process, sell, distribute, install, and operate a filter medium used in a water filtration apparatus for water treatment such as water, sewage, and wastewater.
Particularly, the present invention is very useful for industries that produce, process, sell, distribute, install and operate a sand filtration apparatus for a water treatment plant.
The
A water
Claims (4)
A sand filter medium layer 120 for filtering water to be treated,
A treatment water inflow section 130 for introducing water to be filtered into the main body of the filtration apparatus,
A treated water outlet 140 through which the treated water passed through the sand filter material layer is discharged,
A backwashing unit 150 for performing reverse osmosis by providing reverse osmosis water when occlusion of the sand filter material layer occurs,
A backwash water discharge unit 160 for discharging the backwash water supplied from the backwashing unit and the filtrate of the sand filtration material layer,
And a storage tank (170) functioning to store water to be treated by the sand filtration apparatus,
The sand filter medium layer 120 may be formed of,
(SiO 2 ) is mixed with 100 to 100 parts by weight of glass raw material, which is quartz, general glass, glass bottle or glass scrap, and is dissolved in a temperature range of 850 to 1800 ° C to obtain an iso-electric point ) To a pH of 5 to 9,
A step of quenching the molten glass mass in water at room temperature after the dissolution process,
A step of crushing a glass lump that has undergone the above-mentioned quenching process into a crusher 10,
A screening process of sorting the crushed glass by size after the crushing process,
Characterized in that the sand for the functional filtration device is manufactured by a method comprising the step of sphericalizing the crushed granules by a sphericalizing device which is heated and slowly cooled in a heating furnace which is slowly heated and gradually cooled after the crushing process Device (100).
Wherein the size of the spherical particles is equal to or less than an equivalent coefficient of 0.45 to 0.7 mm in the case of the rapid filtration apparatus and equal to or less than 0.3 in the case of the slow filtration apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150130448A KR101750256B1 (en) | 2015-09-15 | 2015-09-15 | a functional filtering sand and the sand filtering device using thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150130448A KR101750256B1 (en) | 2015-09-15 | 2015-09-15 | a functional filtering sand and the sand filtering device using thereof |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020170075700A Division KR20170081585A (en) | 2017-06-15 | 2017-06-15 | a functional filtering sand and the sand filtering device using thereof |
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| Publication Number | Publication Date |
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| KR20170032719A KR20170032719A (en) | 2017-03-23 |
| KR101750256B1 true KR101750256B1 (en) | 2017-07-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20230121234A (en) | 2022-02-10 | 2023-08-18 | (주)태경조경건설 | Filtering apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20230121234A (en) | 2022-02-10 | 2023-08-18 | (주)태경조경건설 | Filtering apparatus |
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| KR20170032719A (en) | 2017-03-23 |
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