CN113368555A - Porous filter material support plate for lower water collector having extremely hydrophilic surface and water treatment facility comprising same - Google Patents
Porous filter material support plate for lower water collector having extremely hydrophilic surface and water treatment facility comprising same Download PDFInfo
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- CN113368555A CN113368555A CN202010859271.8A CN202010859271A CN113368555A CN 113368555 A CN113368555 A CN 113368555A CN 202010859271 A CN202010859271 A CN 202010859271A CN 113368555 A CN113368555 A CN 113368555A
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- support plate
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- porous filter
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- 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
- B01D24/4694—Regenerating the filtering material in the filter containing filter material retaining means (e.g. screens, balls) placed on the surface of the filter material
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- 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
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- 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
- B01D24/14—Downward filtration, the container having distribution or collection headers or pervious conduits
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- 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
- B01D24/4631—Counter-current flushing, e.g. by air
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Abstract
Disclosed is a porous filter medium support plate for a lower water collector, which has an extremely hydrophilic surface. The porous filter support plate according to the present invention is a support plate which is provided on the upper portion of the porous block-shaped lower water collector and supports the filter medium constituting the filter medium layer, and is an assembly of synthetic resin particles firmly bonded to each other by thermal welding, wherein predetermined pores are formed between adjacent particles so that filtered water, backwash water, and backwash air can flow, and titanium dioxide (TiO) -like material is applied to the surface of the filter support plate or the surface of the particles constituting the filter medium support plate2) Is hydrophilicAnd a hydrophilic substance, whereby the permeation ability of the filtered water and the backwash water, the antifouling effect by the hydrophilic function, and the cleaning ability during backwash are maximized.
Description
Technical Field
The present invention relates to a porous filter support plate which is installed on the upper part of a porous block-shaped lower water collector and supports a filter, and more particularly, to a porous filter support plate for a lower water collector having an extremely hydrophilic surface, which is formed with pores so that filtered water, backwash water, and backwash air can flow, and the surface of which is coated with a hydrophilic material, and a water treatment facility including the same.
Background
Generally, a water treatment facility refers to a facility that receives raw water supplied from a drinking water source and purifies the water at a level suitable for drinking. Water treatment facilities typically include mixing and coagulation basins, settling and filtration basins, and clean water basins. Here, the water passing through the settling tank flows into the upper portion of the filtering tank, passes through a filtering layer composed of sand or activated carbon, etc., and then flows into the clean water tank through the lower water collecting device at the lower portion of the filtering tank.
It is known that the lower water collecting device has a wheel disc (wheelball) shape, a filter (filter) shape, a porous tube shape, a porous block shape, etc., wherein mainly porous block shapes and porous tube shapes that can achieve higher filtering speed and more retention of suspended substances than the same area are used. Porous block shapes and porous tube shapes require the use of air and water backwash by depth filtration.
In a filtration tank of a water treatment facility, a treatment system using filtration gravel (filtration layer) is mainly used in order to support the filtration layer together with a lower water collecting device and to evenly disperse backwash water during backwash, but recently, a porous filter material support plate is often used as a technique capable of replacing the filtration gravel.
If the porous filter material support plate is used, the overall height of the filtration tank can be reduced, which is advantageous in terms of space aspect and low construction cost, and can be combined with the lower water collecting device, thereby providing advantages in that construction is easy and washing is easy. Therefore, porous filter support plates have recently become popular in many water purification plants and water utilities.
The porous filter material support plate functions to support the filter material constituting the filter layer at the upper portion of the lower water collecting device. In addition, the backwashing functions as a filter to uniformly disperse backwashing water (washing water) so that tail carbon generated during the filtration or fine flocs (turbidity) during the backwashing cannot flow into a subsequent process.
If the turbid substances or the tail carbon slag adsorbed during the filtration are tightly attached to the filtration support plate, the filtration efficiency is reduced through the passage and the blocking phenomenon, and the filtration quality is low. Therefore, in practice, water purification plants periodically use water (cleaning water) or air to perform backwashing, and in this process, the turbid materials adhering to the support plates and the filter media are removed by the water flow cutting force and air scouring.
Most of the conventional porous filter support plates are made of High Density Polyethylene (HDPE) having sufficient mechanical hardness, and support the filter without generating environmental hormones. However, since high-density polyethylene is a hydrophobic material and has a high contact angle with water (cleaning water) with respect to the surface of the porous filter support plate, it is not easy to wash with water.
If the washing (reverse washing) is insufficient, negative pressure is generated. That is, one of the causes of the negative pressure is the low efficiency of the back washing by the washing water after the filtration is terminated. If the washing cannot be sufficiently performed by the backwashing with the washing water, fine flocs (turbid materials) remain in the middle of the filter medium or the filter medium support plate, and a local pressure drop or negative pressure occurs at the bottom of the remaining flocs.
If a negative pressure is generated, an Air layer (Air Binding) is formed, so that the filter material floats upwards, the filtering area is reduced, and filtered water is concentrated in one place, thereby causing a Piping (ping) phenomenon. If the piping phenomenon occurs, the filtration flow rate is locally increased, and a phenomenon (Break Through) occurs in which turbid matter adhering to the filter medium leaks out, thereby deteriorating the filtration water quality.
Prior art documents
Patent document
(patent document 1) laid-open patent publication No. 10-2010-0048030 (2010.05.11. publication)
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a porous filter support plate for a lower water collector having an extremely hydrophilic surface, which can increase the contact area with water by coating the surface of a substrate (an aggregate of high-density polyethylene particles, i.e., a filter support plate or particles constituting the filter support plate) with an extremely hydrophilic substance, prevent the adhesion of dirty foreign substances, increase the flow rate of reverse washing water, and increase the contact area, thereby improving the washing effect, and a water treatment facility including the porous filter support plate.
As a means for solving the problems, according to one aspect of the present invention, there is provided a porous filter support plate for a lower water collector having an extremely hydrophilic surface, wherein the filter support plate is provided on an upper portion of a porous block-shaped lower water collector and supports a filter material of a filter layer, the filter support plate is an aggregate of synthetic resin particles firmly bonded to each other by thermal fusion bonding, and has predetermined pores formed between adjacent particles so that filtered water, backwash water and backwash air can flow, and an antifouling layer is formed on a surface of the filter support plate or a surface of the particles constituting the filter support plate by a hydrophilic material so that a contact area with water can be widened, and uniform backwash water penetration and effective foreign matter detachment can be achieved.
As a preferred embodiment, the surface of the filter material supporting plate is coated with titanium dioxide (TiO) in gel state in a predetermined thickness2) The antifouling layer can be formed by post-irradiation with ultraviolet rays.
In another preferred embodiment, the antifouling layer is formed by immersing the filter support plate in an aqueous solution of titanium dioxide, coating the particle surface with a hydrophilic substance, and irradiating ultraviolet rays.
Preferably, the porosity of the porous filter material support plate may be 300 to 500 um.
The porous filter support plate according to the present invention may preferably be composed of asymmetrically shaped High Density Polyethylene (HDPE) particles firmly bonded to each other by thermal welding.
As another preferred embodiment, a tubular core may be inserted into the filter support plate, and injection holes may be formed at equal or unequal intervals in the peripheral surface of the tubular core.
As a means for solving the problem, according to another aspect of the present invention, there is provided a water treatment facility comprising: a lower water collecting device including a body, a support part and a passage part, wherein the interior of the body is divided into an inflow chamber and a dispersion chamber by a partition wall, the support part protrudes above the body, and the passage part is formed on the body at the periphery of the support part; the porous filter material support plate according to the above aspect is placed on the support portion so as to cover the upper surface of the body.
Here, the passage portion of the lower water collecting device preferably includes: a protruding part protruding above the body at a lower height than the supporting part; and a backwashing flow path which communicates with the inside of the body and has an opening formed in the center of the upper surface of the convex portion, wherein the backwashing flow path has an expanded cross-sectional flow path in which the cross-sectional area gradually increases toward the opening side of the body, and a groove having a spiral pattern that is continuous toward the opening is formed in a cylindrical surface of the backwashing flow path having an expanded cross-sectional area upward.
According to the porous filter support plate of the present invention, the surface thereof or the surfaces of the particles constituting the surface are coated with a hydrophilic material, thereby achieving high wettability. Accordingly, the WATER droplet coagulation (WATER clogging) phenomenon, which is a factor causing the reduction of the fluidity of the backwash WATER, is prevented, and the foreign matter can be removed (backwash) more effectively at the same flow rate and flow velocity.
Further, if the surface (or particle surface) of the filter support plate is coated with a hydrophilic material, the contact angle of backwash water with respect to the surface of the filter support plate becomes significantly small, and backwash water smoothly permeates between the surface of the filter support plate (or particle) and foreign matter, so that foreign matter can be easily detached and SELF-CLEANING force can be improved during backwash (SELF-CLEANING).
Drawings
Fig. 1 is a cross-sectional view of a porous filter support plate for a lower water collecting device according to a preferred embodiment of the present invention.
Fig. 2 is a cross-sectional view of a porous filter support plate for a lower water collecting device according to another preferred embodiment of the present invention.
Fig. 3 and 4 are reference views for explaining the operation and effect of the porous filter support plate according to the present invention.
Fig. 5 is a longitudinal cross-sectional view of a porous filter support plate for a lower water collecting device according to still another preferred embodiment of the present invention.
FIG. 6 is a vertical cross-sectional view of the porous filter support plate shown in FIG. 5.
FIG. 7 is a perspective view of a water treatment installation including a porous filter support plate.
Fig. 8 is a perspective view and a sectional view showing an enlarged passage portion constituting the lower water collecting device of fig. 7.
Description of the reference symbols
1: lower water collecting device
10: porous filter material support plate
12: granules
14: pores of
15: antifouling layer
100: lower water collecting device body
200: supporting part
300: passage part
310: backwash flow path
312: spiral groove
320: projecting part
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In describing the present invention, the terminology used in the following description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include the plural expressions unless the context clearly dictates otherwise.
It should be noted that the terms "includes," "including," "has," "having," and the like in this specification specify the presence of stated features, integers, steps, operations, components, or groups thereof, and do not preclude the presence or addition of one or more other features, integers, steps, operations, components, or groups thereof.
Moreover, the terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The term is used for the purpose of distinguishing one constituent element from another constituent element.
The terms "… section", "… unit", "… module" and the like in the specification mean a unit that processes at least one function or operation, and may be implemented by hardware or software or a combination of hardware and software.
In the explanation with reference to the drawings, the same components are denoted by the same reference numerals, and redundant explanations are omitted. In describing the present invention, it is considered that the detailed description of the related known art may unnecessarily obscure the gist of the present invention, and the detailed description thereof is omitted.
Fig. 1 is a sectional view of a porous filter support plate for a lower water collecting device according to a preferred embodiment of the present invention, and fig. 2 is a sectional view of a porous filter support plate for a lower water collecting device according to another preferred embodiment of the present invention.
Referring to fig. 1 to 2, a porous filter support plate 10 according to an embodiment of the present invention is an assembly of synthetic resin particles 12 firmly bonded to each other by thermal welding as a plate-like body having a quadrangular planar structure with a thickness of about 2 cm.
The porous filter support plate 10 according to the embodiment of the present invention is provided above the porous block-shaped lower water collecting device 100 (see fig. 7), and functions to support the filter medium constituting the filter layer 20 (see fig. 7) above the lower water collecting device.
Further, according to the porous filter medium support plate 10 of the embodiment of the present invention, predetermined pores 14 are formed between the particles 12 firmly bonded to each other by thermal welding so that filtered water, backwash water, and backwash air can flow, and a hydrophilic substance is coated on the surface of the filter medium support plate 10 or the surface of the particles 12 constituting the filter medium support plate 10, thereby forming an antifouling layer 15 having affinity for the filtered water and the backwash water (washing water for backwash).
As shown in a preferred embodiment of fig. 1, the antifouling layer 15 is formed on the surface of the filter support plate 10 with a predetermined thickness, more specifically, limited to the upper surface and the lower surface of the filter support plate 10, or as shown in another preferred embodiment of fig. 2, it may be formed on the surface of the synthetic resin particles 12 positioned inside, as well as on the surface of the synthetic resin particles 12 constituting the surface layer of the filter support plate 10 with a predetermined thickness.
Preferably, the hydrophilic substance constituting the antifouling layer 15 is titanium dioxide (TiO)2). The water quality of the titanium dioxide is characteristically volumeThe antibacterial agent has the characteristics of easy combination with water molecules, namely high hydrophilicity and high oxidizing power, thereby having high antibacterial property. In addition, it has odor removing and sterilizing effects, and is non-toxic, and has no biological reaction, thereby having no harm to environment and human body.
In the case of fig. 1, the antifouling layer 15 is formed by applying titanium dioxide in the form of gel (gel) to the surface of the filter support plate 10 in a predetermined thickness and then irradiating ultraviolet rays to harden the titanium dioxide, and in the case of fig. 2, the antifouling layer 15 is formed by immersing the filter support plate 10 in an aqueous titanium dioxide solution for a certain period of time, then taking out and drying the titanium dioxide solution with ultraviolet rays so that the hydrophilic material uniformly penetrates into the inside through the pores 14.
In some cases, before the filter medium support plate 10 is molded, a titanium dioxide film may be formed on the surface of a raw material in a manner of immersing the raw material (synthetic resin particles) in a Pellet form in an aqueous solution of titanium dioxide, taking out the raw material, and drying the raw material with ultraviolet rays, and then the antifouling layer 15 may be formed by molding the filter medium support plate 10 using the raw material (synthetic resin particles) on which the titanium dioxide film is formed.
The pores 14 between the particles 12 constituting the porous filter support plate 10 may be 300 to 500 um. The particles 12 constituting the porous filter support plate 10 are made of a High Density Polyethylene (HDPE) material having mechanical hardness, and can stably support the filter of the filter layer formed on the upper portion without generating environmental hormones, and the shape thereof may be an asymmetric shape advantageous for forming the pores 14.
Here, if the pores 14 between the particles 12 of the porous filter support plate 10 are smaller than 300um, the pores 14 are easily blocked by foreign matter during filtration, and the filtration area is reduced, which may reduce the filtration efficiency and the filtration quality, and if it is larger than 500um, the filter medium (sand or activated carbon constituting the filtration layer) loaded on the upper portion may run off through the filter support plate 10.
Further, if the shape of the High Density Polyethylene (HDPE) particles 12 forming the filter support plate 10 is configured in an irregular asymmetric shape, the particles 12 are bonded while supporting each other by the irregular shape, so that not only the cohesive force increases and the overall internal force increases, but also the particles 12 form pores 14 between them while supporting each other by the irregular shape, so that the pores 14 are formed more easily.
The titanium oxide forming the antifouling layer 15 is highly hydrophilic as described above. Hydrophilicity is a relative concept of hydrophobicity, and if high density polyethylene, which is a hydrophobic material, is not treated, water droplets are generated on the surface of the filter support plate 10 (or the particles 12) by the surface tension of water, as shown in a of fig. 3, thereby causing the fluidity of filtered water or backwash water to be lowered.
On the other hand, if the antifouling layer 15 is formed by the titanium dioxide of the hydrophilic material as in the present invention, water diffuses on the surface of the filter support plate 10 (or the particles 12) due to the property of easily binding with water molecules specific to titanium dioxide as shown in fig. 3b, so that water droplets that lower the fluidity are not generated, but the friction coefficient becomes small, the permeation flow rate of backwash water during backwash increases, and foreign substances can be more effectively removed (backwash).
Further, if the filter medium support plate 10 is made of a hydrophobic material, the backwash water has a high contact angle (the contact angle is increased by the surface tension of the water) with respect to the surface (or particle surface) of the filter medium support plate, and therefore, the backwash water hardly penetrates between the surface (or particle surface) of the filter medium support plate and the foreign matter, and the foreign matter adhering to the surface (or particle surface) of the filter medium support plate is less likely to fall off, resulting in a decrease in the efficiency of backwash.
However, if the antifouling layer 15 is formed by titania which is a hydrophilic material like the present invention, the contact angle of backwash water with respect to the surface of the filter medium support plate 10 (or the surface of the particles 12) becomes significantly smaller (the attractive force between the surface and water is larger than the surface tension of water, so the contact angle becomes smaller), and accordingly, as shown in the reference diagram of fig. 4, backwash water penetrates between the antifouling layer 15 and foreign matter, and the foreign matter can be easily removed.
As described above, according to the porous filter support plate 10 of one embodiment and another embodiment of the present invention, the surface thereof or the surface of the particles 12 constituting the same is coated with a hydrophilic material, so that wettability is increased to prevent a WATER droplet coagulation (WATER BREAKING) phenomenon which is a factor causing a reduction in flowability of backwash WATER, and foreign substances can be removed (backwash) more effectively at the same flow rate and flow rate.
Further, if the surface of the filter medium support plate 10 (or the surface of the particles 12) is treated by the hydrophilic material coating, the contact angle of the backwash water with respect to the surface of the filter medium support plate 10 (or the surface of the particles 12) is significantly reduced, so that the backwash water smoothly penetrates between the surface of the filter medium support plate 10 (or the particles 12) and the foreign matter, and the foreign matter is easily detached during backwash, thereby improving SELF-CLEANING ability (SELF-CLEANING).
Fig. 5 and 6 are sectional views of a porous filter support plate for a lower water collecting device according to still another preferred embodiment of the present invention.
Referring to fig. 5 and 6, in the filter support plate 10 according to still another preferred embodiment of the present invention, a tubular core 16 is inserted (Insert) along the length or width thereof. In this case, injection holes 17 for injecting water and air may be formed at equal or unequal intervals on the edge surface of the tubular core 16 fitted into the filter support plate 10.
The tubular core 16 may be constructed such that one end is closed and the opposite end is opened and exposed to the side of the filter support plate 10, and the open end of the exposed tubular core 16 may be connected to a backwash pipe (not shown) so that backwash water (water for backwash) and air may be supplied to the inside of the tubular core 16 during backwash.
According to still another embodiment of the present invention as described above, in the filter medium support plate 10, the tubular core 16 functions as a reinforcing member, so that the resistance to the load of the filter layer is greatly increased, and the filter layer is not deformed or damaged even under a high load, and the function is exhibited, and the backwashing function and efficiency can be further improved by injecting backwashing air and water from the middle of the filter medium support plate 10 through the tubular core 16.
Next, a water treatment facility including the porous filter support plate according to the embodiment of the present invention described above is observed.
Fig. 7 is a separated perspective view of a water treatment facility including a porous filter support plate, and fig. 8 is an enlarged perspective view and a sectional view of a passage portion constituting the lower water collecting device of fig. 7.
Referring to fig. 7 and 8, the water treatment facility according to the present embodiment includes: a lower water collecting device 1 including a body 100, a support part 200, and a passage part 300, the body 100 being internally divided into an inflow chamber 110 and a dispersion chamber 120 by a partition wall, the support part 200 protruding above the body 100, the passage part 300 being formed at the body 100 around the support part 200; and a porous filter support plate 10 placed on the support 200 so as to cover the upper surface of the body 100.
Here, since the porous filter support plate 10 applied to the water treatment facility of the present embodiment is the above-described porous filter support plate, a repetitive description thereof will be omitted below, and only the configuration of the lower water collecting device 1 on which the porous filter support plate 10 is placed is described in detail.
The lower water collecting device 1 includes a body 100, and the interior of the body 100 is divided into an inflow chamber 110 and a dispersion chamber 120 by a partition wall 130. On the upper surface of the body 100, a plurality of supporting parts 200 for supporting the porous filter supporting plate are formed at intervals. A passage 300 for discharging air and water used for backwashing is formed around the support 200.
The main body 100 may be formed by low pressure foam injection, and a first connection part 102 and a second connection part 103 may be formed at a front end portion of one side in the longitudinal direction and a front end portion of the other side of the opposite side in a form capable of being coupled to each other, respectively, so that a plurality of the main bodies may be connected in series in the longitudinal direction according to installation conditions or environments.
The first connection part 102 is formed to protrude a certain length from the boundary part of the body 100 along the outer edge, so that when the bodies are coupled to each other, the second connection part 103 of another adjacent body can be coupled to each other in an interference fit manner by wrapping the second connection part outside, and a plurality of protrusions 102a and holes 103a can be formed in the first connection part 102 and the second connection part 103, thereby generating a strong coupling force when the bodies are coupled to each other.
Preferably, the support 200 may be formed in a cross (+) shape like a letter or the like, but is not limited thereto, and is not particularly limited if it is in a shape capable of stably supporting the filter support plate mounted on the upper portion of the body.
The support 200 protrudes from the upper surface of the body 100 at a certain height, and protrudes relatively higher than the passage 300, so that the support 200 and the passage 300 are spaced apart by a predetermined distance even if a plurality of support plates 10 are placed on the support 200, and therefore, reverse washing air and water can be stably injected toward the filter medium support plate 10 through the passage 300.
The support portion 200 also serves as a barrier to block a gap of the passage portion 300 disposed around the support portion 200 at a certain height. Thus, even if reverse cleaning air and water are simultaneously sprayed in a diffused state through the passage portion 300 around the support portion 200, stable partitioned spraying without interference can be realized.
As shown in the drawing, the supporting portions 200 are formed in a manner of being arranged in a left-right double and opposite manner in the width direction of the main body 100 while being spaced apart from each other at a predetermined interval in the longitudinal direction of the upper surface of the main body 100, but are not limited to such an arrangement.
An inflow groove 2 recessed inward is formed at the center of the upper portion of the body 100. The inflow channel 2 collects the filtered water existing between the main body 100 and the filter medium support plate 100 during the reverse washing, and guides the filtered water to the dispersion chamber 120 through the inflow holes 2a, so that the air contained in the reverse washing air and the water can be stably circulated, thereby stabilizing the flow of the fluid.
The body 100 is configured in a form in which the lower plate 1a is inclined downward toward the center, so that when mortar is poured on the bottom surface of a site for construction, the mortar can be uniformly poured into a gap between the bottom surface and the inclined lower plate 1a, and thus can be more stably installed.
A cutting plate 140 may be provided at an inner side of the body 100 to partially divide the dispersion chamber 120 with respect to a length direction of the body. The cutting plate 140 maintains a constant height of the air layer of the dispersion chamber 120, so that the air for backwashing maintains a constant pressure above the main body during backwashing, and thus the air can be more efficiently sprayed.
In the backwashing, an air layer is formed at the inner upper portion of the dispersion chamber 120, and the backwashing efficiency can be uniformly maintained over the entire area only when the backwashing air is discharged to the filter unit while the air layer is maintained at a uniform height over the entire longitudinal area of the dispersion chamber 120.
If the air layers in the dispersion chamber 120 are different in height from each other, the backwashing efficiency greatly differs in different regions depending on the height of the air layer at the time of backwashing, and therefore the backwashing quality cannot be expected on the average as a whole.
The drawings show a configuration in which the cutting plates 140 are applied to the inner side of one end portion of the body 100, but the present invention is not limited thereto, and the number of the cutting plates provided in one body or the installation interval thereof may be different depending on the size, length, volume of the dispersion chamber, and the like of the body.
The body 100 includes: an inflow chamber 110 having a space into which reverse washing air and water flow; the inflow chamber 110 adjoins the dispersion chamber 120 at the side; and a partition wall 130 that separates and divides the inflow chamber 110 and the dispersion chamber 120, and has a communication hole 132 for communicating the inflow chamber 110 and the dispersion chamber 120.
The inflow chamber 110 serves as a passage through which air and water used for backwashing flow in, has a cross section of a substantially triangular shape in the body 100 by the partition wall 130 and extends in the longitudinal direction of the body 100, and the dispersion chamber 120 is partitioned from the inflow chamber 110 by the cross section of the substantially inverted triangular shape on the left and right sides of the adjacent upper portion of the inflow chamber 110.
The partition 130 is obliquely disposed inside the block in a right and left pair in a form of an isosceles triangle, and the communication holes 132 are formed at regular intervals (or patterns), so that the reverse washing air and water can smoothly move from the inflow chamber 110 to the dispersion chamber 120.
The upper passage portion 300 of the body 100 includes: a protrusion 320 protruding above the body at a lower height than the support 200; and a backwash flow path 310 which communicates with the inside of the main body 100 and has an opening formed at the center of the upper surface of the protrusion 320. The backwashing flow path 310 communicates with the dispersion chamber 120 of the main body 100, and air and water supplied through the dispersion chamber 120 during backwashing are injected through the backwashing flow path 310 toward the filter medium support plate 10.
The backwash flow path 310 may be provided in a form in which the cross-sectional area thereof gradually increases in the direction of the dispersion chamber 120 toward the projection 320, i.e., above the drawing (see fig. 8). Therefore, the fluid (reverse cleaning air and water) is sprayed and diffused to the filter medium support plate 10 over a wider area, and the filter medium support plate 10 can be finally cleaned more uniformly.
A spiral pattern-continuous groove 312 is formed on the cylindrical surface of the backwash flow path 310 toward the opening. Therefore, the backwash air and water injected along the backwash flow path 310 toward the filter medium support plate 110 during backwash travel along the spiral grooves 312 and can be strongly injected toward the filter medium support plate 10 while imparting rotational characteristics.
If the reverse washing air and water are given rotation while moving along the spiral grooves 312, they can be sprayed toward the filter medium support plate 10 by being more uniformly distributed than if they were sprayed simply in the vertical direction, thereby reducing the Dead water area (Dead space) where foreign matters are not removed.
Further, if directivity is given in the rotation direction in the flow of the reverse washing air and water by the spiral grooves 312, the inflow angle to the filter medium support plate 10 is smaller and the flow resistance is reduced as compared with the simple vertical injection, so that the energy (kinetic energy) loss is reduced. Finally, the foreign matters attached to the surface of the filter material supporting plate and the particle surface can be removed more effectively.
In the above detailed description of the present invention, only specific examples according to the invention have been described. It should be understood, however, that the invention is not limited to the particular embodiments described in the detailed description, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the claims.
Claims (8)
1. A porous filter material support plate for a lower water collector having an extremely hydrophilic surface,
in the filter material support plate which is provided at the upper part of the porous block-shaped lower water collecting device and supports the filter material of the filter material layer,
the filter support plate is an aggregate of synthetic resin particles firmly bonded to each other by thermal fusion bonding, and has predetermined pores formed between adjacent particles so that filtered water, backwash water, and backwash air can flow,
an antifouling layer is formed on the surface of the filter material support plate or the surface of the particles constituting the filter material support plate by a hydrophilic substance, so that the contact area with water can be widened, and uniform reverse washing water permeation and effective foreign matter detachment are realized.
2. The porous filter support plate for a lower water collector having an extremely hydrophilic surface according to claim 1, wherein,
coating gel-state titanium dioxide (TiO) on the surface of the filter support plate to a predetermined thickness2) And then irradiating ultraviolet rays to form the antifouling layer.
3. The porous filter support plate for a lower water collector having an extremely hydrophilic surface according to claim 1, wherein,
the filter support plate is immersed in an aqueous titanium dioxide solution, the particle surface is coated with a hydrophilic substance, and then ultraviolet rays are irradiated, thereby forming the antifouling layer.
4. The porous filter support plate for a lower water collector having an extremely hydrophilic surface according to claim 1, wherein,
the porosity of the porous filter material support plate is 300-500 um.
5. The porous filter support plate for a lower water collector having an extremely hydrophilic surface according to claim 1, wherein,
the porous filter support plate is composed of High Density Polyethylene (HDPE) particles of asymmetric shape firmly bonded to each other by thermal welding.
6. The porous filter support plate for a lower water collector having an extremely hydrophilic surface according to claim 1, wherein,
a tubular core material is embedded in the filter material supporting plate,
the edge surface of the tubular core material is provided with injection holes at equal or unequal intervals.
7. A water treatment facility, comprising:
a lower water collecting device including a body, a support part and a passage part, wherein the interior of the body is divided into an inflow chamber and a dispersion chamber by a partition wall, the support part protrudes above the body, and the passage part is formed on the body at the periphery of the support part;
the porous filter support plate according to any one of claims 1 to 6, which is placed on the support so as to cover the upper surface of the body.
8. The water treatment facility of claim 7,
the passage portion of the lower water collecting device includes:
a protruding part protruding above the body at a lower height than the supporting part;
a backwashing flow path which is communicated with the inner side of the body and is provided with an opening at the center of the upper surface of the bulge part,
the backwash flow path is a cross-sectional expanding flow path in which the cross-sectional area gradually increases toward the opening side of the main body,
a groove having a continuous spiral pattern is formed on the cylindrical surface of the backwash flow path having an increasing cross-sectional area in the upward direction toward the opening.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2020-0029777 | 2020-03-10 | ||
| KR1020200029777A KR102426331B1 (en) | 2020-03-10 | 2020-03-10 | Porosity filter media for under drain device and Water treatment facility containing the same |
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| Publication Number | Publication Date |
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| CN113368555A true CN113368555A (en) | 2021-09-10 |
| CN113368555B CN113368555B (en) | 2023-02-03 |
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| CN202010859271.8A Active CN113368555B (en) | 2020-03-10 | 2020-08-24 | Porous filter material support plate for lower water collector having extremely hydrophilic surface and water treatment facility comprising same |
Country Status (2)
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| KR (1) | KR102426331B1 (en) |
| CN (1) | CN113368555B (en) |
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| JPH08257312A (en) * | 1995-03-22 | 1996-10-08 | Maezawa Ind Inc | Filter equipment |
| CN1513040A (en) * | 2001-04-25 | 2004-07-14 | 南欧派克有限公司 | Photocatalytic coating material having photocatalytic activity and adsorption property and method for preparating same |
| KR101435017B1 (en) * | 2014-04-10 | 2014-08-28 | 전진아 | A underdrain device with backwashing fluid orifice structure for uniform distribution |
| KR101562335B1 (en) * | 2015-05-20 | 2015-10-22 | 아이펙이엔지 주식회사 | Fluid purification apparatus using spiral flow and method for purifying the same |
| KR101817292B1 (en) * | 2017-09-08 | 2018-01-11 | 효림산업주식회사 | Porous block type underdrain apparatus having dimple structure |
| CN107673542A (en) * | 2016-08-01 | 2018-02-09 | 苏州科环环保科技有限公司 | The processing method of gas generator water containing phenol |
| CN113710752A (en) * | 2019-03-12 | 2021-11-26 | 利物浦大学 | Improvements relating to superhydrophobic surfaces |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100048030A (en) | 2008-10-30 | 2010-05-11 | 효림산업주식회사 | Porous block type underdrain apparatus |
-
2020
- 2020-03-10 KR KR1020200029777A patent/KR102426331B1/en active IP Right Grant
- 2020-08-24 CN CN202010859271.8A patent/CN113368555B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08257312A (en) * | 1995-03-22 | 1996-10-08 | Maezawa Ind Inc | Filter equipment |
| CN1513040A (en) * | 2001-04-25 | 2004-07-14 | 南欧派克有限公司 | Photocatalytic coating material having photocatalytic activity and adsorption property and method for preparating same |
| KR101435017B1 (en) * | 2014-04-10 | 2014-08-28 | 전진아 | A underdrain device with backwashing fluid orifice structure for uniform distribution |
| KR101562335B1 (en) * | 2015-05-20 | 2015-10-22 | 아이펙이엔지 주식회사 | Fluid purification apparatus using spiral flow and method for purifying the same |
| CN107673542A (en) * | 2016-08-01 | 2018-02-09 | 苏州科环环保科技有限公司 | The processing method of gas generator water containing phenol |
| KR101817292B1 (en) * | 2017-09-08 | 2018-01-11 | 효림산업주식회사 | Porous block type underdrain apparatus having dimple structure |
| CN113710752A (en) * | 2019-03-12 | 2021-11-26 | 利物浦大学 | Improvements relating to superhydrophobic surfaces |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20210114264A (en) | 2021-09-23 |
| KR102426331B1 (en) | 2022-07-29 |
| CN113368555B (en) | 2023-02-03 |
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