KR20130000305A - Sand filter and fitration method using the liquefaction - Google Patents

Abstract

PURPOSE: A sand filtering apparatus using liquefaction phenomena, and a method for the same are provided to continuously reuse filtering sand by collecting clogged filtering sand and washing the collected filtering sand. CONSTITUTION: A sand filtering apparatus using liquefaction phenomena includes a filtering tank(100), a discharging part(200), a feed water supplying pipe(300), filtering sand(400), and a vibrator(500). A feed water inlet(110) is formed at one side of the filtering tank, and a purified water outlet(120) is formed at another side of the filtering tank. The discharging part is formed at the lower part of the filtering tank, and a J-shaped discharging pipe(220) is formed at the lower part of a discharging chute(210) which forms the discharging part. The feed water supplying part is spaced apart from the upper part of the discharging part, and one end part of the feed water supplying part is connected to the feed water inlet. The filtering tank and the discharging part are filled with the filtering sand. The vibrator is combined with one side of the filtering tank or the discharging part.

Description

Sand filter and method using liquefaction phenomena {Sand filter and fitration method using the liquefaction}

The present invention relates to a sand filtration apparatus and method using a liquefaction phenomenon, and more particularly, a filtration tank in which a raw water inlet is formed on one side and a purified water outlet is formed on the other side; A discharge part formed under the filtration tank and having a J-shaped discharge pipe formed under the discharge chute; A raw water supply pipe formed at an upper side of the discharge part at a predetermined distance, and having one end connected to the lower side of the raw water inlet part, and being formed to be long in the horizontal direction in the filtration tank; Filtration yarn filled in the filtration tank and the discharge portion; And a vibrator coupled to one side of the filtration tank or the discharge part. It can be made, including the filtration layer of the filter yarn occluded in the filtration process by the operation of the vibrator can be automatically removed using the liquefaction phenomenon to maintain a constant purification ability to improve the water quality of the purified water, while The present invention relates to a sand filtration apparatus and method using a liquefaction phenomenon which can remove a filtration layer that is blocked at the same time and thus allow continuous water treatment.

In general, the sand filtration device is a device for purifying water through the sand layer as one of the water purification process in the water purification plant is mainly used for water treatment of tap water and sewage.

Depending on the filtration method, it is divided into two types of rapid filtration and slow filtration. Rapid filtration can be processed in large quantities, but the purification power is inferior. In slow filtration, biofilms are formed on sand particles to remove small foreign substances, such as bacteria and heavy metals, but the filtration efficiency is low.

And depending on the location of inflow and outflow of raw water can be divided into downflow and upflow. The downflow method is a sand filtration method using natural oil, which filters only the surface of the filter media, so that the filtration duration is short and the linear velocity of the filter decreases rapidly, requiring frequent backwashing and a large filtration area to secure a constant filtration rate. Do.

Therefore, frequent backwashing is required due to blockage (blockage) of the media surface layer, and backwashing of 5 to 15% of the water treatment flow rate is required for backwashing, and also backwashing once a day for sewage and once every three days for water. Should be implemented.

That is, the number of backwashing and the amount of backwashing required for backwashing are large, and the backwashing also has to be reprocessed again, resulting in high energy loss.

In addition, there is a problem that the long time use, the filter layer is completely occluded and the entire sand must be replaced (when sewage needs to replace all or part of the sand about once a year).

And the existing sand filtration method can generate a channel when used for a long time, mud ball (sand and solids entangled to form a lump of 20 ~ 25mm), air binding (air underwater in negative pressure or temperature rise The glass layer may be bubbled in the sand layer, and break through (a phenomenon in which solid material flows out as the filtration rate increases due to a decrease in the filtration area) may occur, thereby degrading the filtration water quality.

In addition, the existing sand filtration must be equipped with a bottom collecting device, such as a perforated block, backwashing device, so the facility cost is high, and continuous filtration is impossible.

Sand filtration also has physicochemical filtration, such as adhesion and adsorption, and biological filtration by microorganisms that proliferate in the filter paper, in addition to mechanical filtration in which particles larger than the pores of the media are filtered. Has the ability to remove On the other hand, when using a membrane or a membrane such as a micro filter (MF), since the soluble material is not filtered, there is a problem that a chlorine disinfection by-product due to a separate disinfection occurs.

In addition, the upflow method is a method in which raw water is introduced from the lower side and the purified water is discharged to the upper side through the sand layer, and it is difficult to apply to a large-scale facility because most facilities are made of small tanks.

Similarly, upstream sand filtration requires frequent backwashing, resulting in a large number of backwashing, and water purification problems similar to downflowing.

1 is a schematic view showing a sand filter of a conventional upflow method.

First, the filtration tank 20 is filled in the filtration tank 10, and the raw water inlet pipe 30 is installed below the filtration tank 10 to the water treatment into the filtration sand 20 inside the filtration tank 10. It is configured to introduce raw water.

And the upper side of the filtration tank 10 is a purified water discharge pipe 40 is configured so that the filtered purified water outflow, the raw water introduced into the raw water inlet pipe 30 is purified through the filter sand 20 is filtered tank ( 10 is discharged to the purified water discharge pipe 40 configured on the upper side is made of filtration.

At this time, in the center of the filtration tank 10, the riser 50, the compressed air discharge device 51 is formed at the lower end of the riser 50, the separation tank configured at the top of the riser (50) 60), the separation pipe 70 is formed to the lower side of the separation tank and the discharge pipe 80 is formed on one side of the upper side of the separation tank (60).

Here, a part of the filtration sand 20 moves upward along the riser pipe 50 by the compressed air discharge device 51 and enters the separation tank 60 so that foreign matters are separated by the air bubbles. Rising to the upper side of the) is discharged to the discharge pipe 80, the filter yarn 20 is circulated into the filtration tank 10 is introduced along the separation pipe (70).

Thus, a device for continuously purifying and filtering the filter sand 20 while at the same time has been developed, but the device is complicated, the foreign matter and the filter sand 20 in the separation tank 60 is not well separated In this case, foreign matter may be introduced into the purified water outlet pipe 40, so that there is a problem that water quality may deteriorate.

The present invention has been made to solve the problems as described above, the object of the present invention is that the part of the blockage during filtration is the filter yarn around the raw water supply pipe acting as a filter medium so that the filter yarn of the blockage portion is automatically removed The present invention provides a sand filtration apparatus and method using a liquefaction phenomenon capable of maintaining filtration capacity and purified water quality and allowing continuous water purification.

In addition, the sand filtration apparatus and method using a liquefaction phenomenon to recover the filter sand to recover the clogged filter sand is recovered in the recovery tank and washed in the sand washing apparatus and supplied to the sand distribution device configured on the upper side of the filtration tank. To provide.

Sand filtration apparatus using the liquefaction phenomenon of the present invention for achieving the above object, the filtration tank 100 is formed with a raw water inlet 110 on one side and the purified water outlet 120 on the other side; A discharge part 200 formed at a lower side of the filtration tank 100 and having a J-shaped discharge pipe 220 formed below the discharge chute 210; A raw water supply pipe 300 formed to be spaced apart from the discharge unit 200 by a predetermined distance and having one end connected to the lower side of the raw water inlet 110 so as to be formed in the filtration tank 100 in a horizontal direction; Filtration yarn 400 is filled in the filtration tank 100 and the discharge unit 200; And a vibrator 500 coupled to one side of the filtration tank 100 or the discharge part 200. And a control unit.

In addition, the raw water supply pipe 300 is characterized in that a plurality of raw water supply holes 310 are formed on the lower side.

In addition, it is characterized in that it further comprises a recovery tank 600 which is formed to receive the discharge portion 200 in the lower side of the filtration tank 100.

In addition, it is characterized in that it further comprises a sand distribution device 700 is configured on the upper side of the filtration tank 100 so that the filtration yarn 400 is replenished.

In addition, one side is connected to the recovery tank 600 and the other side is characterized in that it further comprises a sand washing device 800 is connected to the sand distribution device (700).

The sand washing apparatus 800 is characterized in that the hydrocyclone (hydrocyclone).

The filter yarn 400 is characterized by being formed by stacking two or more different media.

And the filtration method using the sand filtration apparatus of this invention,

Raw water is supplied to the raw water supply pipe 300 to pass through the filter yarn 400 to be filtered upward (S10); And operating the vibrator 500 during the step S10 such that the filter yarn 400 blocked around the raw water supply pipe 300 is removed through the discharge pipe 320 (S20). And a control unit.

At this time, the step S20 is characterized in that it is performed repeatedly over a certain time.

Sand filtration apparatus and method using the liquefaction phenomenon of the present invention can automatically remove the filtered sand of the blocked portion to maintain a constant filtration capacity and water quality, and can remove the filtered sand clogged at the same time with purified water. It is not necessary and has the advantage of allowing continuous integers.

In addition, there is an advantage that the continuous reuse of the filter sand can be recovered by supplying to the sand distribution device configured on the upper side of the filtering tank after the filtered sand to be collected in the recovery tank and washed in the sand washing device. .

In addition, since the filtered sand can be removed at the same time as the purified water can be used for continuous purified water can be used to filter the relatively small particles there is an advantage that the water quality of the purified water is improved and the filtration rate is increased.

1 is a schematic view showing a conventional sand filtration device.
Figure 2 is a schematic diagram showing a sand filtration apparatus using the liquefaction phenomenon of the present invention.
Figure 3 is a perspective view showing a sand filtration device using the liquefaction phenomenon of the present invention.
4 is a perspective view showing a discharge unit according to the present invention.
5 is a schematic view showing another example of the sand filtration apparatus using the liquefaction phenomenon of the present invention.

Hereinafter, the sand filtration apparatus and method using the liquefaction phenomenon of the present invention as described above will be described in detail with reference to the accompanying drawings.

2 is a schematic view showing a sand filtration apparatus using the liquefaction phenomenon of the present invention.

Sand filtration apparatus using the liquefaction phenomenon of the present invention as shown is a filtration tank 100 is formed with a raw water inlet 110 on one side and the purified water outlet 120 on the other side; A discharge part 200 formed at a lower side of the filtration tank 100 and having a J-shaped discharge pipe 220 formed below the discharge chute 210; A raw water supply pipe 300 formed to be spaced apart from the discharge unit 200 by a predetermined distance and having one end connected to the lower side of the raw water inlet 110 so as to be formed in the filtration tank 100 in a horizontal direction; Filtration yarn 400 is filled in the filtration tank 100 and the discharge unit 200; And a vibrator 500 coupled to one side of the filtration tank 100 or the discharge part 200. It is made, including.

First, the filtration tank 100 has a raw water inlet 110 is formed long in the height direction on one side, the water purification outlet 120 is formed on the other side of the filtration tank 100.

An inlet 111 is formed in the upper portion of the raw water inlet 110 so that the raw water is introduced, the outlet 121 is formed so that the purified water is filtered out to the purified water outlet 120.

At this time, the inlet 111 is formed higher than the outlet 121, the upflow to the raw water flowing into the inlet 111 to maintain a constant height in the raw water inlet 110 to be purified by gravity It is preferred that the manner is applied.

And the discharge portion 200 is formed on the lower side of the filtration tank 100, the discharge chute 210 is coupled to the filtration tank 100 and the discharge pipe 220 in the J-shaped lower portion of the discharge chute 210 ) Is formed.

At this time, the raw water supply pipe 300 is formed to be spaced apart a predetermined distance on the upper side of the discharge unit 200, the raw water supply pipe 300 is connected to one end of the raw water inlet 110, the other end is the filtration tank It is fixed to 100.

And the filter yarn 400 is filled in the filtration tank 100 and the discharge unit 200, the filter yarn 400 is filled to a lower height than the purified water outlet 120 of the filtration tank 100. And is filled up to the end of the discharge pipe 220 of the discharge unit (200).

In addition, the vibrator 500 is coupled to one side of the filtration tank 100 or the discharge part 200.

In this case, the vibrator 500 may be connected to the filtration tank 100 or the discharge unit 200 may be coupled to another position capable of transmitting vibration.

Thus, the filtration method using the sand filtration apparatus of the present invention is configured as described above, the raw water is supplied to the raw water supply pipe 300 is filtered and passed through the filter yarn 400 to the upper side (S10); And operating the vibrator 500 during the step S10 such that the filter yarn 400 blocked around the raw water supply pipe 300 is removed through the discharge pipe 320 (S20). It is made, including.

That is, when raw water flows into the inlet 111, the raw water inlet 110 and the raw water supply pipe 300 pass through the filter yarn 400 upwards and are filtered and discharged to the purified water outlet 120 to purify the water. Is done.

At this time, the portion of the raw water is filtered is the filtration yarn 400 around the raw water supply pipe 300, the filtration process is blocked by the foreign matter is reduced filtration capacity.

Therefore, if the filter yarn 400 around the raw water supply pipe 300 is blocked by filtering the raw water for a predetermined time, it is necessary to remove or backwash the filter sand 400 to maintain the purification ability. The vibrator 500 is operated to remove it through.

When the vibrator 500 is operated by the liquefaction phenomenon of the filter yarn 400, it flows like a liquid and is discharged to the distal end of the discharge pipe 220 of the discharge unit 200.

That is, before the vibrator 500 is operated, the filter yarn 400 filled in the discharge pipe 220 of the discharge unit 200 is not discharged by the stress, and the vibrator 500 operates to operate the filter tank ( 100) and the ultrasonic wave is applied to the discharge unit 200, the filter yarn 400 of the discharge unit 200 by the weight of the filter yarn 400 filled in the filtration tank 100 and the discharge unit 200 is As it is pushed down and overflowed to the distal end of the discharge pipe 220 may remove the filter yarn 400 is blocked.

In this case, the liquefaction phenomenon is that when the water is present in the pores of the filter yarn 400 as the pore water, when the vibration is applied, the filter yarn 400 loses shear resistance and is in a state where it can flow like liquid. Even if a small vibration is applied to the liquefied filtration yarn 400, the filtration yarn 400 is overflowed by the self-weight of the filtration yarn 400, which is filled in the filtration tank 100, and flows down to the outside of the discharge pipe 220. I will go.

As described above, the sand filtration apparatus using the liquefaction phenomenon of the present invention can automatically remove the filtration yarn 400 of the occluded portion by using the liquefaction phenomenon, so that backwashing is not necessary, and the filtration yarn 400 that is occluded while purifying at the same time. It is possible to remove the continuous water purification, and also has the advantage of maintaining a constant filtration capacity and water quality.

In addition, the step S20 may be performed repeatedly over a certain time.

That is, the filtered yarn 400 which is repeatedly blocked at regular time intervals may be removed without continuously removing the blocked filter yarn 400 around the raw water supply pipe 300 while the raw water is filtered.

At this time, the vibrator 500 may be operated to block the raw water supplied to the raw water supply pipe 300 before removing the filter yarn 400.

In addition, the filter yarn 400 is preferably used that the particles are fine and even so that the liquefaction phenomenon is more likely to occur.

In addition, the filtration tank 100 is preferably formed of a material resistant to corrosion and excellent in corrosion resistance and wear resistance to withstand the wear caused by the filtration yarn 400, the efficiency of transmitting the ultrasonic vibration of the vibrator 500 It is more preferable that it is made of a material that can increase the.

In addition, the vibrator 500 may be installed at one side of the filtration tank 100 or the discharge part 200 or connected to the filtration tank 100 or the discharge part 200 to transmit vibrations. It is preferable to select and install a position capable of transmitting vibration to the filter yarn 200 well.

That is, as shown in FIG. 2, the recovery tank 600 is configured to accommodate the discharge part 200 at the lower side of the filtration tank 100 and the inclined plate 610 is formed on the inner side of the recovery tank. A plurality of vibrators 500 can be installed on the bottom surface.

Thus, the vibration may be transmitted to the filtration tank 100 and the discharge part 200 by using the vibrator 500, and one side of the filter yarn 400 discharged from the discharge pipe 220 along the inclined plate 610. Can be gathered together.

And the vibrator 300 should be used to generate a high frequency vibration can be more liquefied phenomenon of the filter yarn 400 and preferably used to generate ultrasonic vibration in the range of 20kHz to 100kHz, but other than ultrasonic It is also possible to use a vibrator that generates low frequencies.

In addition, the discharge unit 200 may be formed long in the length or width direction at the bottom of the filtration tank 100 as shown in Figure 3, the discharge unit 200 is a long shape or polygon as shown in Figure 4 It may be formed in various ways.

In addition, the raw water supply pipe 300 has a plurality of raw water supply holes 310 formed at the lower side, the raw water flowing into the raw water inlet 110 to the filter yarn 400 through the raw water supply hole (310). While being supplied, the raw water supply hole 310 may not be blocked by the filter yarn 400 and the foreign matter filtered.

At this time, the raw water supply hole 310 may be formed in the form of a groove long in the lower side of the raw water supply pipe (300).

In addition, a recovery tank 600 may be formed at the lower side of the filtration tank 100 to accommodate the discharge part 200.

The recovery tank 600 is formed at the lower side of the filtration tank 100 is formed so that the discharge part 200 is accommodated therein and sealed, the filtration discharged from the discharge part 200 without the raw water flowing out The yarn 400 may be recovered.

In addition, a sand distribution device 700 is formed on the upper side of the filtration tank 100 to replenish the filtration yarn 400, and is supplemented with the filtration yarn 400 discharged to the discharge portion 200 is reduced. can do.

At this time, the sand distribution device 700 is formed in a narrow width as shown in Figures 2 and 3, the lower end of the sand distribution device 700 when the filter yarn 400 is replenished into the filter tank 100 If the filter yarn 100 is replenished, it may be no longer replenished.

In addition, the transfer means 710 may be coupled to both sides of the sand distribution apparatus 700 so as to evenly feed the filter yarn 400 while moving in the length or width direction of the upper side of the filtration tank 100.

In addition, a sand washing device 800 may be configured such that one side is connected to the recovery tank 600 and the other side is connected to the sand distribution device 700.

That is, a sand transfer pump 820 is installed between the recovery tank 600, the sand washing apparatus 800, and the sand distribution apparatus 700, respectively, and connected to the sand transfer pipe 810, so that the recovery tank 600 is connected. After separating the foreign matter from the sand washing apparatus 800, the filtered sand 400 recovered from the supplied to the sand distribution device 700 can reuse the filtered sand 400.

In this case, the sand washing apparatus 800 may be used hydrocyclone (hydrocyclone).

The hydrocyclone is formed with a washing water supply pipe 830 and a discharge pipe 840 on one side, and when the washing water is supplied from the washing water supply pipe 830, the heavy sand is pushed down to the outside of the cylinder by centrifugal force due to the rotation of the fluid. Gathered into, the foreign matter is separated and discharged to the discharge pipe 840 is formed on the upper side can wash the filter yarn 400.

In addition, the filter yarn 400 may be formed so that two or more different media are stacked.

That is, the filter yarn 400 may be used to form a form in which the media such as anthracite, activated carbon, zeolite or pearlite are laminated together with sand.

For example, when sand and anthracite are stacked and used, the sand distribution device 700 is formed into two compartments so that one side can supply sand and the other anthracite, and an opening and closing device is installed at the bottom thereof.

And by controlling the opening and closing device to form the thickness of the media layer to be laminated in multiple layers by one layer of sand, one anthracite.

In addition, the filter medium discharged through the discharge unit 200 is transferred to the hydrocyclone to separate the foreign matter by the difference in specific gravity at the same time by separating the foreign matter by the rotation of the washing water, the separated two media is the sand distribution device Separated at 700 to be supplied again.

That is, the andhrasite is lighter than sand, so when the hydrocyclone is washed, the sand sinks to the bottom and the andhrasite forms a layer on the top thereof, thereby separating sand and andhrasite.

As such, when the filter medium is composed of two layers, the water quality of purified water can be further improved by using a filter medium having a small particle diameter and a filter having good adsorption function.

In addition, the sand transfer pump 820 may be used in the sand (water) sand pump used for collecting sand from the river, civil engineering, dredging, concrete sediment of the ready-mix concrete plant or sediment of other industrial plants, spiral type A pump or a diaphragm type pump may be used, but it is preferable to use a pump having excellent wear resistance, no leakage, and no clogging.

As another example of the sand filter of the present invention, as shown in FIG. 5, the filtration tank 100 is formed in a cylindrical shape, and a conical recovery tank 600 is formed at a lower side thereof, and the raw water inlet 110 may be configured to be positioned at the center. have.

That is, the pressure filtration method of forming the raw water inlet 110 as a pipe and feeding the raw water through this may be applied instead of the filtration method by the gravity of the raw water.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It goes without saying that various modifications can be made.

1000: sand filtration apparatus using the liquefaction phenomenon (of the present invention)
100: filtration tank
110: raw water inlet 111: inlet
120: purified water outlet 121: outlet
200:
210: discharge chute 220: discharge pipe
300: raw water supply pipe 310: raw water supply hole
400: filtered yarn
500: oscillator
600: recovery tank 610: inclined plate
700: sand distribution device 710: transfer means
800: sand washing device
810: sand conveying pipe 820: sand conveying pump
830: washing water supply pipe 840: drainage pipe

Claims (9)

Raw water inlet 110 is formed on one side and the other side is the filtration tank 100 is a water purification outlet 120 is formed;
A discharge part 200 formed at a lower side of the filtration tank 100 and having a J-shaped discharge pipe 220 formed below the discharge chute 210;
A raw water supply pipe 300 formed to be spaced apart from the discharge unit 200 by a predetermined distance and having one end connected to the lower side of the raw water inlet 110 so as to be formed in the filtration tank 100 in a horizontal direction;
Filtration yarn 400 is filled in the filtration tank 100 and the discharge unit 200; And
A vibrator 500 coupled to one side of the filtration tank 100 or the discharge part 200; Sand filtration apparatus using the liquefaction phenomenon, characterized in that comprises a.
The method of claim 1,
The raw water supply pipe 300 is a sand filtration device using a liquefaction phenomenon, characterized in that a plurality of raw water supply holes 310 are formed on the lower side.
The method of claim 1,
Sand filtering device using a liquefaction phenomenon characterized in that it further comprises a recovery tank 600 which is formed to receive the discharge portion 200 in the lower side of the filtration tank (100).
The method of claim 3,
The sand filtration apparatus using the liquefaction phenomenon, characterized in that further comprises a sand distribution device 700 is configured on the upper side of the filtration tank 100 to replenish the filtration yarn (200).
5. The method of claim 4,
One side is connected to the recovery tank 600 and the other side is sand filtration device using the liquefaction phenomenon, characterized in that further comprises a sand washing device (800) connected to the sand distribution device (700).
The method of claim 5,
The sand washing device 800 is a sand filtration device using a liquefaction phenomenon, characterized in that the hydrocyclone (hydrocyclone).
6. The method according to claim 1 or 5,
The filter sand 400 is a sand filtration device using a liquefaction phenomenon, characterized in that formed by two or more different media stacked.
In the filtration method using the sand filtration apparatus of any one of Claims 1-7,
Raw water is supplied to the raw water supply pipe 300 to pass through the filter yarn 400 to be filtered upward (S10); And
Operating the vibrator 500 during the step S10 such that the filter yarn 400 blocked around the raw water supply pipe 300 is removed through the discharge pipe 320 (S20); Sand filtration method comprising a.
9. The method of claim 8,
The step S20 is sand filtration method, characterized in that it is carried out repeatedly for a certain time.

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