KR102224351B1 - Underdrain system for wastewater treatment - Google Patents

Abstract

The present invention relates to a lower collecting device for filter paper, and more particularly, to a lower collecting device having advantages of a strainer block type water collecting device and a perforated block type water collecting device.

Description

Underdrain system for wastewater treatment

The present invention relates to a lower collecting device for filter paper, and in particular, to a lower collecting device having the advantages of a well-known strainer block type collecting device and a perforated block type collecting device.

In general, a water purification plant refers to a water purification facility for supplying purified water to a home as a drinking water source after receiving raw water composed of waste water and purifying it through predetermined water purification processes.

Such a water purification plant physically precipitates foreign substances contained in the raw water, a blending paper that mixes the raw water treated in the water treatment chemical with a water treatment chemical, and agglomeration that forms a floc that is agglomerated from the raw water compounded with water treatment chemicals in the blending plant. A sedimentation basin for sedimentation by natural sedimentation of paper and flocs formed in the coagulation basin by gravity, a filter paper for filtering the raw water from which the flocs are removed from the sedimentation basin, and disinfecting agents such as chlorine are added to the raw water filtered by the filter paper. After final purification, it is supplied to the home.

The raw water supplied from the filter paper in a state in which the suspended substances are aggregated passes through the filter medium, and the suspended substance is attached to the filter medium or the suspended substance is removed by the sieving function of the filter medium.

There are a strainer block type and a perforated block type in the lower collecting device of such a filter paper.

In the strainer block type lower collecting device, the water filtered through the filter medium is collected downward while passing through the strainer block, and is configured to be discharged through an outlet pipe.

However, when filtration is performed, flocs accumulate in the filter material and cannot pass through, the water level inside the lower collecting device drops and the bottom of the strainer block becomes in a vacuum state. At this time, backwashing is performed to remove the residue accumulated in the gap between the filter material and the filter material. It needs to be taken out, but usually, air is supplied from the bottom of the filter material and the filter material is expanded through an air pipe, and when the outlet valve is closed and the backwash valve is opened, the backwash water rises and the residues between the filter material and the filter material are removed. The cycle of discharging through and starting filtration again is repeated.

The perforated block is usually provided with a cap obtained by compressing activated carbon. Water is collected to the bottom through the cap, and structurally equal air supply is possible.

The perforated block has the advantage of being able to uniformly supply air even at a place far away from the air pipe by adjusting the size of the hole so that the pressure varies according to the section.

However, these perforated blocks are more expensive than strainer blocks.

Although the strainer block itself is inexpensive, the cost of civil engineering works is relatively high because a space having a height of about 700mm to 1000mm must be formed at the bottom.

Document 1. Korean Intellectual Property Office Registered Patent Publication No. 10-0338525, "Lower collecting device of rapid filter paper" Document 2. Korean Intellectual Property Office Registration Utility Model Publication No. 20-0258668, "Lower collecting device of filter paper" Document 3. Korean Intellectual Property Office Registered Patent Publication No. 10-0454276, "How to use the integrated lower collecting device of the filter paper and the lower collecting device"

The present invention was conceived to solve the above problems, and it is possible to efficiently filter debris contained in raw water, and by supplying air evenly, it is possible to maintain an equal collection performance, and a filter paper capable of reducing construction costs. It is an object of the present invention to provide a bottom collecting device for use.

In order to achieve the above object, the lower collecting device for filter paper according to the present invention includes an air discharge hole 132 at predetermined intervals, and an air branch pipe continuously formed on the upper part of the water collecting part 13 to be perpendicular to the air pipe 130. (131); The body 121 is formed with an open lower portion of the cross-sectional shape, and inlet holes 122 are formed at predetermined intervals in the form of holes drilled on both sides of the body 121 so that the air branch pipe 131 is (121) a predetermined number of molding panels 120 fastened to the bottom of the filter paper 10 so as to be accommodated therein; And a filter medium 110 formed on the continuously installed molding panel 120.

At this time, it is preferable to form a slit 123 in the inlet hole 122 of the molding panel 120 to block the inflow of the filter material.

In addition, it is preferable that both sides of the molding panel 120 are formed to be inclined so that the width becomes narrower toward the top, so that the purified water that has passed through the filter medium 110 can flow smoothly.

In addition, by forming a predetermined number of air vents 124 in the form of perforated holes on the upper surface of the molding panel 120, it is configured to discharge the remaining air inside the molding panel 120 through the air vent 124. desirable.

In addition, the forming panel 120 is preferably formed by bending a metal plate.

In addition, flanges 125 are fastened to the bottom of the filter paper with anchor bolts at the bottom of both sides of the molding panel 120, and fillers 127 are inserted between the flanges 125 of each of the molding panels 120, and the flanges ( By applying the chemical resin 128 in the section between the 125) and the filler 127, it is preferable to configure to seal the gap between the molding panels 120.

In addition, it is preferable to form the mortar 129 on the top of the filler 127 to a predetermined thickness.

In addition, each of the air branch pipes 131 gradually increases in diameter of the air discharge hole 132 as the distance from the compressed air inlet side of the air pipe 130 increases, and the diameter of the air discharge hole 132 gradually decreases after a predetermined period. By being configured to be configured, it is preferable to configure the air to be uniformly sprayed from each of the air discharge holes (132).

In addition, the air discharge hole 132 formed in each of the air branch pipes 131 gradually increases in diameter from the center to the end where the air pipe 130 is fastened, and then the air discharge hole after a predetermined section. (132) By being configured to gradually decrease in diameter, it is preferable to configure the air to be uniformly sprayed from each of the air discharge holes 132.

The present invention configured as described above can increase filtration efficiency, and since air is supplied evenly, the blockage section does not occur, so it is possible to maintain uniform water collection performance and to reduce construction cost.

In addition, the strainer block can be removed from the conventional aging strainer block type lower collecting device, and the lower collecting device of the present invention can be easily installed at low cost.

1 is a front cross-sectional view showing a lower collecting device for filter paper according to the present invention.
Figure 2 is a side cross-sectional view showing a lower collecting device for filter paper according to the present invention.
Figure 3 is a perspective view showing a state in which the air pipe is installed on the filter paper.
Figure 4 is a perspective view showing a state in which the molding panel is installed on the filter paper.
5 is a perspective view showing a molding panel.
Figure 6 is a cross-sectional view showing a state in which the molding panel is installed.
7 is a perspective view showing a state in which the support is installed.
8 is a perspective view showing a support.
9 and 10 are views showing the air pressure inside each air branch pipe by position.

Hereinafter, the present invention will be described in detail with reference to a preferred embodiment of the present invention and the accompanying drawings, but will be described on the premise that the same reference numerals in the drawings refer to the same elements.

In the detailed description of the invention or in the claims, when any one component "includes" another component, it is not construed as being limited to only the component unless otherwise stated, and other components It is to be understood that it may further include.

The lower collecting device for filter paper according to the present invention is a filter paper 10 provided with a raw water supply pipe 11, a purified water discharge pipe 14, and a backwash water supply pipe 16, as shown in FIGS. 1 and 2. An air supply device is installed in the lower part, a molding panel 120 is formed on the air supply device, and a filter medium 110 layer is formed on the molding panel 120.

When the raw water of the sedimentation basin is supplied through the raw water supply pipe 11, the filter paper 10 configured as described above passes through the filter medium 110 and the debris is filtered, and is collected in the purified water collecting unit 13 at the bottom thereof, and the purified water discharge pipe It is configured to be discharged through (14).

When backwashing is required because the pores of the filter medium 110 are blocked, the valve 15 of the purified water discharge pipe is closed, and the valve 17 of the backwash water supply pipe 16 is opened to transfer backwash water to the purified water collecting part 13. By supplying, the backwash water passes through the filter medium 110 and removes debris clogging the voids.

At this time, the compressed air supplied to the air pipe 130 is injected in the form of a bubble from the lower portion of the filter medium 110 through the air branch pipe 131 to open the voids of the filter medium 110 so that the debris can be effectively cleaned.

As shown in FIG. 3, an air pipe 130 to which external compressed air is supplied is installed to be located in the water purification unit 13, and an air branch pipe 131 is provided at predetermined intervals in the air pipe 130. It is installed to be perpendicular to the air pipe 130, and the air branch pipe 131 is formed with an air discharge hole 132 at predetermined intervals, so that the compressed air supplied to the air pipe 130 is each air branch pipe 131 ) And is configured to be sprayed into the air discharge hole 131.

The filter medium 110 layer is formed on the upper portion of the air pipe 130 and the air branch pipe 131 configured as described above, and the molding panel 120 is fastened to the upper portion of the air branch pipe 131 as shown in FIG. 4, The filter medium 110 is prevented from settling into the purified water collecting part 13 to maintain the space of the purified water collecting part 13.

The forming panel 120 is formed by bending a thin metal plate, and as shown in FIG. 5, the body 121 is formed in a square shape with an open lower portion of the cross-sectional shape, and the upper surface is perforated at predetermined intervals. Air vents 124 are formed in the form of holes, and inlet holes 122 are formed in the form of perforated holes on both sides.

At this time, it is preferable that both sides of the molding panel 120 are formed to be inclined so that the width of the molding panel 120 becomes narrower toward the top so that purified water can be smoothly introduced into the inlet hole 122.

In addition, slits 123 are provided in each inlet hole 122 at predetermined intervals to prevent the filter medium from flowing into the molding panel 120 through the inlet hole 122.

In addition, by forming a flange 125 protruding outward with a fastening hole 126 at the bottom of both sides of the body 121, the panel formed with anchor bolts on the bottom of the filter paper 10 through the fastening hole 126 It is configured to fasten and fix 120.

The molding panel 120 configured as described above is installed to cover each of the air branch pipes 131 as shown in FIG. 4, and thus serves to support the filter medium 110 layer from settling into the water collecting part 13 below. do.

After positioning the molding panel 120 so that the air branch pipes 131 are accommodated in the body 121 of the molding panel 120 as shown in FIG. 4, fastening formed on the flange 125 of the molding panel 120 An anchor bolt is fastened to the ball 126 to fasten and fix the molding panel 120 to the bottom of the filter paper 10.

When the molding panel 120 is installed on the filter paper 10 as described above, a gap is generated between the molding panel 120 and the molding panel 120, as shown in FIG. The gap between the molding panels 120 must be sealed because 110) may fall into the water collecting part 13 through the gap between the molding panels 120.

As shown in FIG. 6, a filler 127 in the form of a metal plate is inserted between the flanges 125 of the forming panels 120 that are continuously installed, and a chemical resin ( 128) is applied to seal the gap between the molding panels 120, and a mortar 129 is formed on the filler 127 to have a predetermined thickness.

Since the raw water supplied from the filter medium 110 and the raw water supply pipe 11 is located on the top of the molding panel 120, a high load is applied vertically to the molding panel 120 formed by bending a thin metal plate. 120) may be crushed or collapsed, and other damage may occur.

If the molding panel 120 is formed of a thick metal plate, it can withstand a high load in the vertical direction, but molding and construction are difficult, and the unit cost is increased.

For this purpose, it is preferable to install the support 140 shown in FIG. 7.

As shown in FIG. 8, the support part 140 includes an upper band 141 in a semicircular shape with an open lower portion, and an upper rod protruding vertically from the upper portion of the upper band 141 by forming a screw thread on the outer surface thereof. 144 is configured, and consists of a lower band 146 in a semicircular shape with an open upper portion, and a lower rod 149 protruding vertically from the lower portion of the lower band 146 by forming a screw thread on the outer surface.

As shown in FIG. 7, in the support part 140, the upper band 141 is in close contact with the air branch pipe 131 inside the molding panel 120, and the upper rod 144 is formed of the molding panel 120. It is fastened to and fixed to the molding panel 120 with a nut 145 through the upper surface.

And the lower band 146 is in close contact with the lower air branch pipe 131 inside the molding panel 120, the lower rod 149 is screwed to the bottom of the filter paper 10 like an anchor bolt.

By bolting to the fastening hole 143 formed in the flange 142 of the upper band 141 and the fastening hole 148 formed in the flange 147 of the lower band 146, the upper and lower bands 141 and 146 are It is fastened and fixed to the air branch pipe 131.

The support parts 140 as described above are continuously installed at predetermined intervals along the length direction of each forming panel 120.

The support 140 configured as described above is rigidly fixed so that the air branch pipe 131 does not move inside the molding panel 120, so that compressed air is injected from the air discharge hole 132 of the air branch pipe 131. Prevents vibration from occurring when.

In addition, the support 140 is fastened to the bottom of the filter paper 10 to support the upper surface of the panel 120, so that the weight of the filter medium 110 located on the top of the forming panel 120 and the raw water supply pipe 11 It serves to prevent damage to the molded panel 120 by the vertical load by supporting the vertical load transmitted to the molding panel 120 by the weight of the raw water.

The operation of the lower collecting device for filter paper according to the present invention configured as described above will be described in detail.

When the raw water of the sedimentation basin is supplied to the filter paper 10 through the raw water supply pipe 11 of FIG. 1, the supplied raw water passes through the filter medium 110 and the sludge is filtered through the filter medium 110, and then the formation of the lower part of the filter medium 110 It is introduced into the inlet hole 122 of the panel 120.

At this time, since the slit 123 is densely formed in the inlet hole 122 as shown in FIG. 5, the filter medium 10 is prevented from flowing into the inlet hole 122.

The purified raw water introduced into the inlet hole 122 of the molding panel 120 is collected by the water purification unit 13 under the filter paper 10, and the purified raw water collected by the water purification unit 13 is a purified water discharge pipe. Is discharged through.

When the above-described purification process is performed for a certain period of time, sludge is trapped in the pores of the filter medium 10 and thus the purification efficiency is lowered. At this time, the backwashing process is performed.

In the backwashing process, the valve 15 of the purified water discharge pipe 14 is closed in FIG. 1, the valve 17 of the backwash water supply pipe 16 is opened, and backwash water is supplied to the purified water collecting unit 13, and the air pipe ( 130) to supply compressed air.

The compressed air supplied to the air pipe 130 is injected through the air discharge hole 132 of the air branch pipe 131 to open the gaps between the filter media 110 to remove the residue, and the backwash water is filled to remove the residue. . The removed debris is discharged through a drainage channel.

When the backwashing process as described above is completed, the valve 17 of the backwashing water supply pipe 16 is closed, and the valve 15 of the purified water discharge pipe 14 is opened, and filtration starts again.

At this time, the air remaining inside the molding panel 120 exits through the air vent 124 formed on the upper surface of the molding panel 120. If air remains inside the molding panel 120, performance is degraded during the filtering process, so that the remaining air can escape through the air vent 124 of the molding panel 120.

The air vent 124 also serves to allow the remaining air to escape, and during the filtration process, the inside of the molding panel 120, that is, the boundary between the molding panel 120, and the pressure difference between the upper and lower parts, facilitates water collection. Although it may not be performed, since a pressure difference does not occur through the air vent 124, it also serves to facilitate water collection.

The important thing in the above-described backwashing process is that the air injected from the air branch pipe 131 must be uniformly injected.

If air is not evenly supplied from the air branch pipe 131 when performing the backwashing process, a section where some of the filter media 110 is not properly backwashed causes a section to be blocked. Since it becomes a dead section that does not work, it is very important to evenly supply air from the air branch pipe 131.

Compressed air is branched from the air pipe 130 to each air branch pipe 131, and the air pressure inside each air branch pipe 131 is slightly different for each location.

9 is a view showing the pressure of each position of the air branch pipe 131 with respect to the inlet of the air pipe 130 into which compressed air is introduced.

As shown in FIG. 9, the air branch pipe 131 located at p1 closest to the inlet side of the air pipe 130 through which compressed air is introduced maintains a high pressure, and the pressure in the air branch pipe 131 located at p2 is rapidly lowered. It can be seen that the air pressure gradually increases as is going to p2, p3, and p4.

Therefore, the air discharge hole 132 of the air branch pipe 131 located in p1 is formed small, and the air branch pipe 131 located in p2 forms the air discharge hole 132 large, and p3, p4, p5, It is preferable to form the air discharge hole 132 of the air branch pipe 131 gradually smaller as it goes to ...

In addition, each air branch pipe 131 is air is injected through the air discharge hole 132 while the compressed air is spread from the center to both sides, and the compressed air is compressed for each position of the air discharge hole 132 of each air branch pipe 131 The air pressure is different.

10 is a view showing the pressure of compressed air for each position of the air discharge hole 132 of each of the air branch pipe 131.

As shown in FIG. 10, the pressure of the air discharge hole 132 located at the center h1 of the air branch pipe 131 indicates a high pressure, and the pressure of the air discharge hole 132 located at h2 decreases rapidly, then h3, h4, It can be seen that the air pressure gradually increases as it goes to h5, h6,....

Therefore, contrary to this pressure graph, the air discharge hole 132 at the h1 position is formed small, the air discharge hole 132 at the h2 position is formed larger, and the air goes to h3, h4, h5, h6, .... It is preferable to form the discharge hole 132 gradually smaller.

That is, by forming the size of the pressure discharge hole 132 so as to be inversely proportional to the pressure graphs of FIGS. 9 and 10, it is possible to supply uniform air during the backwashing process, thereby maintaining the uniform water collection performance.

The present invention configured as described above can efficiently filter the debris contained in the filter material, and by evenly supplying air, the occluded section does not occur, so it is possible to maintain an equal water collection performance, and to reduce construction costs.

In addition, the strainer block can be removed from the conventional aging strainer block type lower collecting device, and the lower collecting device of the present invention can be easily installed at low cost.

The technical idea of the present invention was examined through the above-described embodiments.

It is apparent that those of ordinary skill in the art to which the present invention pertains can variously modify or change the above-described embodiments from the description of the present invention.

In addition, even if not explicitly shown or described, a person of ordinary skill in the technical field to which the present invention pertains can make various modifications including the technical idea according to the present invention from the description of the present invention. Is self-evident, which still belongs to the scope of the present invention.

The above embodiments described with reference to the accompanying drawings have been described for the purpose of describing the present invention, and the scope of the present invention is not limited to these embodiments.

10: filter paper 11: raw water supply pipe
12: valve 13: water collection unit
14: purified water discharge pipe 15: valve
16: backwash water supply pipe 17: valve
110: filter material 120: molded panel
121: body 122: inlet hole
123: slit 124: air vent
125: flange `126: fastening hole
127: filler 128: chemical resin
129: mortar 130: air piping
131: air branch pipe 132: air discharge hole
140: support 141: upper band
142: flange 143: fastening hole
144: upper rod 145: nut
146: lower band 147: flange
148: fastening hole 149: lower rod

Claims (6)

An air branch pipe 131 continuously formed on the upper portion of the water purification unit 13 to be perpendicular to the air pipe 130 by having an air discharge hole 132 at predetermined intervals;
The body 121 is formed with an open lower portion of the cross-sectional shape, and inlet holes 122 are formed at predetermined intervals in the form of holes drilled on both sides of the body 121 so that the air branch pipe 131 is (121) a predetermined number of molding panels 120 fastened to the bottom of the filter paper 10 so as to be accommodated therein; And
Consists of; a filter medium 110 formed on the top of the continuously installed molding panel 120,
A semicircular upper band 141 with an open lower part;
An upper rod 144 protruding vertically from an upper portion of the upper band 141 by having a screw thread formed on the outer surface thereof;
A semicircular lower band 146 with an open top; And
A lower rod 149 protruding perpendicularly to the lower portion of the lower band 146 is provided with a thread formed on the outer surface thereof,
The lower collecting device for filter paper, characterized in that it further comprises a support (140) fastened and fixed to the air branch pipe (131). An air branch pipe 131 continuously formed on the upper portion of the water purification unit 13 to be perpendicular to the air pipe 130 by having an air discharge hole 132 at predetermined intervals;
The body 121 is formed with an open lower portion of the cross-sectional shape, and inlet holes 122 are formed at predetermined intervals in the form of holes drilled on both sides of the body 121 so that the air branch pipe 131 is (121) a predetermined number of molding panels 120 fastened to the bottom of the filter paper 10 so as to be accommodated therein; And
Consists of; a filter medium 110 formed on the top of the continuously installed molding panel 120,
Flanges 125 are fastened to the bottom of the filter paper with anchor bolts on the lower sides of both sides of the forming panel 120,
A filler 127 is inserted between each of the molding panels 120 and the flange 125 to be filled, and a chemical resin 128 is applied to the section between the filler 127 and the flange 125, and the filler 127 ) A lower collecting device for filter paper, characterized in that configured to seal a gap between the molding panels 120 by forming a mortar 129 with a predetermined thickness on the top. An air branch pipe 131 continuously formed on the upper portion of the water purification unit 13 to be perpendicular to the air pipe 130 by having an air discharge hole 132 at predetermined intervals;
The body 121 is formed with an open lower portion of the cross-sectional shape, and inlet holes 122 are formed at predetermined intervals in the form of holes drilled on both sides of the body 121 so that the air branch pipe 131 is (121) a predetermined number of molding panels 120 fastened to the bottom of the filter paper 10 so as to be accommodated therein; And
Consists of; a filter medium 110 formed on the top of the continuously installed molding panel 120,
Each of the air branch pipes 131 is configured such that the diameter of the air discharge hole 132 gradually increases as the distance from the compressed air inlet side of the air pipe 130 increases, and then gradually decreases,
The air discharge hole 132 formed in each of the air branch pipes 131 is configured such that the diameter of the air discharge hole 132 gradually increases and then gradually decreases as the air pipe 130 is fastened from the center to the end,
A lower collecting device for filter paper, characterized in that the air is uniformly sprayed from each of the air discharge holes (132). The method according to any one of claims 1 to 3,
The molding panel 120 is formed by bending a metal plate, and the inlet hole 122 of the molding panel 120 is provided with a slit 123 for blocking the inflow of the filter material, and both sides of the molding panel 120 The lower collecting device for filter paper, characterized in that it has an inclined shape so that the width becomes narrower toward the top. The method according to any one of claims 1 to 3,
The lower collecting device for filter paper, characterized in that the air vent 124 is formed in the form of a hole formed on the upper surface of the molding panel 120.
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