WO2011126175A1

WO2011126175A1 - Upward flow filtration apparatus

Info

Publication number: WO2011126175A1
Application number: PCT/KR2010/003202
Authority: WO
Inventors: 주대성
Original assignee: 에스아이비(주)
Priority date: 2010-04-06
Filing date: 2010-05-20
Publication date: 2011-10-13
Also published as: KR101180746B1; KR20110111992A

Abstract

Provided is an upward flow filtration apparatus comprising: a filtration tank comprising an inlet for inflow of feed water (sewage) formed at a lower end and an outlet for the discharge of filtrated water (purified water) formed at an upper end which creates high filtration efficiency and allows backwash to be more easily and successfully carried out; media layers wherein media having different fiber thickness are arranged to form a plurality of layers, provided inside the filtration tank; a plurality of screens provided on upper and lower surfaces of the media layers for preventing separation of the media, on which a plurality of fine holes are formed; a stirring device comprising a rotation axis crossing the center of the filtration tank upwards and downwards, and a rotation wing provided in the rotation axis to stir the media, provided inside the media layers; and a backwash device for supplying backwash water into the media layers for carrying out backwash.

Description

Upflow Filter

The present invention relates to an upflow filtration apparatus, and more particularly, to install filtration media having different thicknesses in a plurality of layers to improve filtration efficiency, as well as to easily and reliably backwash by installing a stirring blade. It is possible to relate to an upflow filtration device.

Filtration is a representative process to remove particulate contaminants present in water in the water purification process for producing domestic and industrial water and the water treatment process for sewage and wastewater.

For example, in a water purification plant, chemicals (coagulants) are mixed (mixed) with raw water, and contaminants (phosphates, etc.) contained in the raw water are reacted with a coagulant while stirring to precipitate in the form of a solid (floc), and then settled. The sedimentation process is followed by filtration in the sand filter and the final purified water is used as water.

In the case of sewage and wastewater treatment plants, the biologically treated and chemically treated water is usually sent to sand filter papers, and the filter media layer is easily clogged by contaminants, which takes a lot of time and money to backwash it.

There is a need for a filtration device that can efficiently perform backwashing, which is a process of removing the foreign matter trapped in the filtration process by increasing the filtration speed and reducing the volume of the filter paper.

Korean Patent Publication Nos. 10-0519680, 10-0406190, and the like disclose technologies for filtration tanks that can be installed in a relatively small space as compared to conventional sedimentation basins and that can easily perform filtration and backwashing. .

In addition, the Republic of Korea Registered Utility Model Publication No. 20-0339212 discloses a technology for upflow floating wastewater treatment device using a multi-layer media.

An object of the present invention is to provide an upflow filtration apparatus having a higher filtration efficiency and more easily and reliably backwashing the media based on the technology of the conventional water filter and wastewater treatment apparatus.

The upflow filtration device proposed by the present invention includes a filtration tank formed with an inlet through which raw water (sewage) is introduced at a lower end thereof, and an outlet through which filtered water (constant water) is discharged from an upper end thereof, and installed inside the filtration tank. The filter media layer having a different thickness of media formed in a plurality of layers, a plurality of screens installed on the upper and lower surfaces of the media layer to prevent separation of the media and forming a plurality of fine holes, and the center of the filtration tank A stirring device including a rotating shaft installed up and down and the rotating blade is installed in the filter medium layer and installed on the rotating shaft to stir the filter medium, and a backwashing apparatus for supplying backwash water to the inside of the filter medium layer to perform backwashing. It is made, including.

The median layer is configured such that media having a relatively high specific gravity and a relatively thick media are disposed at the bottom, and media having a relatively small specific gravity and a relatively small thickness of the fibers at the top.

The filter medium layer is composed of two or more layers, preferably two to five layers.

It is also possible to install a plurality of screens across the inside of the filter layer to separate the filter media of different thicknesses of the fibers of the filter layer from each other inside the filter tank.

The stirring device includes a motor, a rotation shaft which is rotated by receiving the rotational force of the motor, and is installed to traverse the center of the filtration tank up and down, and is integrally installed on the rotation shaft and installed to stir the media of the media layer. It consists of a rotary wing.

The backwashing device includes an ejector for mixing and supplying backwash water and air, and a backwash water supply pipe connected to the ejector and spraying backwash water mixed with air to a plurality of points in the media layer.

In addition, the upflow filtration device according to the present invention may be provided at a lower portion of the inner filter layer in the filtration tank and further include a plurality of inclined sedimentation plates or inclined sedimentation tubes.

In the upflow filtration device according to the present invention configured as described above is filtered for contaminants while the raw water (filtrate) supplied to the inlet passes through the filter bed layer, the filtered water (water) is discharged through the outlet.

According to the upflow filtration apparatus according to the present invention, by forming a filter medium layer in a plurality of layers, by placing a thick media of the fiber at the bottom and the media of the small thickness of the fiber in order to the top, contaminants Since the filtration step by step, the filtration efficiency is greatly improved, the filtration burden is greatly reduced.

In addition, according to the upflow filtration device according to the present invention, due to the deep filtration effect of the filter media of different fiber thickness, the filtration duration is longer and the backwash cycle is increased, so that the backwash water required for backwashing is less, and the backwashing result is reduced. The amount of discharged water generated can also be reduced.

And according to the upstream filtration device according to the present invention, by operating the stirring device while supplying the backwash water containing air through the backwashing device to agitate the media by the stirring blade, it is easy to wash the contaminants attached to the media And surely done. Furthermore, it is possible to perform backwashing on the filter in a short time, which makes it possible to significantly reduce the cost and time for backwashing.

1 is a longitudinal sectional view schematically showing a first embodiment of an upflow filtration device according to the present invention.

Figure 2 is a longitudinal sectional view schematically showing a second embodiment of the upflow filtration device according to the present invention.

Figure 3 is a longitudinal sectional view schematically showing a third embodiment of the upflow filter apparatus according to the present invention.

Figure 4 is a cross-sectional view showing a state in which the screen is coupled to the filtration tank in the third embodiment of the upflow filter apparatus according to the present invention.

Fig. 5 is a longitudinal sectional view showing a state of backwashing in the third embodiment of the upflow filter apparatus according to the present invention.

6 is a longitudinal sectional view showing a fourth embodiment of the upflow filter apparatus according to the present invention.

7 is a longitudinal sectional view showing a fifth embodiment of the upflow filter apparatus according to the present invention.

8 is a longitudinal sectional view showing a sixth embodiment of the upflow filter apparatus according to the present invention.

9 is a cross-sectional view showing a sixth embodiment of the upflow filter apparatus according to the present invention.

10 is a longitudinal sectional view showing a seventh embodiment of the upflow filter apparatus according to the present invention.

Explanation of Reference Numbers

10-filtration tank, 14-inlet, 16-outlet, 20-media bed, 22,24,26-media

30-Agitator, 32-Motor, 34-Shaft, 36-Agitator blades, 42-Screen

50-backwash, 52-ejector, 54-backwash, 60-gradient plate

70-screen shifter, 72-cylinder, 74-piston, 76-connecting rod

Next, a preferred embodiment of the upflow filtration device according to the present invention will be described in detail with reference to the drawings.

First, the first embodiment of the upflow filtration device according to the present invention, as shown in Figure 1, the filtration tank 10, the filter medium layer 20, the screen 42, the stirring device 30, backwash Device 50.

The filtration tank 10 is formed with an inlet 14 through which raw water (filtrate) flows into the lower end, and an outlet 16 through which filtered water (clean water) is discharged.

Therefore, raw water (sewage) is introduced into the inlet 14 of the lower portion of the filtration tank 10, and then the filtered water (water), which is filtered for contaminants while passing upwardly through the filtration tank 10, the outlet 16 of the upper portion (16). To form an upward flow into ().

The filter medium layer 20 is installed in a plurality of layers inside the filtration tank 10.

The filter media layer 20 is installed to fill about 1/2 to 2/3 of the entire internal space of the filtration tank 10.

The media layer 20 is composed of a plurality of layers of fibrous media (for example, media made of synthetic fibers such as PP, PE or PET) having different thicknesses of fibers.

For example, the median layer 22 having a thick fiber is disposed at the lower portion of the median layer 20, and the median layer 26 having a small thickness of the fiber is disposed at an upper portion of the median layer. 24 is arranged.

In the above, the thickness of the fibers constituting the media (22), (24), (26) is represented by denier (denier), for example, the media (22) located at the bottom is formed of 10 to 20 denier fibers And, the mediator 26 located in the uppermost part is formed from 1 to 5 denier fibers, and the mediator 24 located in the middle is formed from 6 to 10 denier fibers.

As described above, when the

media layers

22, 24, and 26 having different thicknesses of fibers are arranged in layers, contaminants may be gradually formed when raw water (sewage) passes upward. It is filtered and the filtration burden is greatly reduced. For example, large contaminants are filtered as they pass between the bottom layer media 22, and small contaminants are filtered as they pass between the media layer 26 at the top layer, so each layer of media is filtered. (22), (24) and (26) share the filtration function, greatly reducing the overall filtration burden.

In the above, the specific gravity of the media (22), (24), (26) can also be configured differently by the thickness of the fibers (by denier). For example, the specific gravity of the thick media 22 of the fibers located in the lower portion is large, the specific gravity of the media 26 of the small thickness of the fibers located in the upper portion is small, the thickness of the fibers located in the middle is medium The specific gravity of the filter medium 24 is preferably configured to have an intermediate value.

As described above, if the specific gravity of the media (22), (24), (26) is configured and arranged to decrease step by step from the bottom to the top, the media (22), (24), ( 26 are arranged in layers.

The filter medium layer 20 is composed of two or more layers, preferably 2 to 5 layers.

The media (22), (24), (26) can be formed and used in various three-dimensional shape, such as spherical shape, ellipsoidal shape, cube, rectangular parallelepiped, cross wing shape.

The media (22), (24), and (26) are manufactured using a hydrophilic material, and when the surface is hydrophobic, the surface is coated with a hydrophilic material to effectively filter the contaminants. It is preferable because it consists of.

The screen 42 is installed on the upper and lower surfaces of the media layer 20 to prevent the separation of the media (22), (24), (26).

The screen 42 is formed with a plurality of fine holes to prevent the movement of the media (22), (24), (26) and to allow the movement of raw water (filtrate).

The screen 42 is configured using a perforated plate, a porous plate, a mesh plate, or the like.

The screen 42 is installed inside the filtration tank 10, the lower screen 42 is installed above a predetermined height from the position of the inlet 14, and the predetermined height from the position of the outlet 16 Install the upper screen 42 at the bottom.

In the second embodiment of the upflow filtration device according to the present invention, as shown in FIG. 2, a screen 42 is disposed in the middle of the filter layer 20 so as to distinguish each layer of the filter layer 20.

For example, a plurality of screens 42 for separating the

media

22, 24, and 26 having different thicknesses of the fibers of the media layer 20 into the filter tank 10 so as not to be mixed with each other. It is installed across the inner layer 20.

The stirring device 30 is provided with a rotating shaft 34 which is installed across the center of the filtration tank 10 up and down, and the inside of the filter medium layer 10, the filter medium (22), (24), (26) It comprises a plurality of rotary blades 36 installed on the rotary shaft 34 and the motor 32 for rotating the rotary shaft 34 to stir.

As the motor 32 rotates forward and backward, the rotation shaft 34 receives the rotational force and rotates forward and backward.

The rotary blades 36 are preferably disposed so as to be positioned to correspond to each layer of the media layer 20 so that the rotary blades 36 can stir the

media

22, 24 and 26 effectively.

The backwashing device 50 performs a function of backwashing by supplying backwash water into the media layer 20.

The backwashing apparatus 50 is not particularly limited as long as it is known to those skilled in the art, and preferably, the ejector 52 which supplies a mixture of backwashing water and air, and the ejector 52. And a backwash water supply pipe 54 for injecting backwash water mixed with air to a plurality of points in the media layer 20.

In the first and second embodiments of the upflow filtration apparatus according to the present invention configured as described above, the raw water (sewage) supplied to the inlet 14 of the filtration tank 10 is located above the media layer 20. Filtration for the contaminants is made while passing through, and the filtered water (purified water) is discharged to the outside through the outlet (16).

When the filtration efficiency is drastically lowered by performing the filtration process as described above for a long time or when the filter medium layer 20 is blocked, the backwashing device 50 is operated to wash the

filter media

22, 24, and 26. Is done.

When the backwashing device 50 is operated, the backwashing water is sprayed through the backwashing water supply pipe 54 toward the

filter media

22, 24, and 26 to perform cleaning.

In the backwashing process, the stirring device 30 is operated simultaneously with the backwashing device 50.

Therefore, when backwash water is sprayed and washed, the stirring blades 36 of the stirring device 30 are rotated forward and backward to stir the

media

22, 24 and 26, so that the washing operation is easier. It is certainly done.

The backwash may be configured to form a downflow, or may be configured to form an upflow.

In general, the backwashing water is formed so as to form a downflow, so the

media

22, 24, and 26 are arranged to have a thicker thickness of the fibers in sequence, and thus, the

media

22, 24, and 26 Emissions of contaminants that have been removed from are made easier.

In the third embodiment of the upflow filtration apparatus according to the present invention, a left screw 33 and a right screw 35 are formed on the rotating shaft 34, and the screen 42 It is configured to be coupled to the left screw 33 or the right screw 35 of the rotary shaft 34 in a state in which rotation is constrained.

For example, the top screen 42 is coupled to the left screw 33 formed on the rotary shaft 34 above the top stirring blade 36, and the second screen 42 from the top is the top stirring blade 36. Coupled to the right hand screw 35 formed on the rotary shaft 34 between the intermediate stirring blade 36 and the second screen 42 from below, the rotary shaft between the intermediate stirring blade 36 and the lower stirring blade 36. It is coupled to the left screw 33 formed in the 34, the bottom screen 42 is configured to be coupled to the right screw 35 formed on the rotary shaft 34 below the bottom stirring blade 36.

In addition, each screen 42 is installed so that the projections 48 of the outer circumferential surface are inserted into the grooves 18 formed on the inner surface of the filtration tank 10 so that the rotation is constrained so as not to rotate along the rotation shaft 34.

In this configuration, as the rotating shaft 34 performs forward and reverse rotation, the screen 42 is reciprocated upward or downward in the up and down direction, and the distance between neighboring screens 42 becomes far and near. Is repeated (the state indicated by the solid line and the state indicated by the dashed line in FIG. 5) is repeated.

Therefore, as shown in FIG. 5, since the spacing between the

media materials

22, 24, and 26 of each layer is widened and narrowed in the backwashing process, the stirring action by the stirring blade 36 is repeated. With this, the effect of more effective backwashing is obtained. In other words, the media (22), (24), (26) of each layer is moved up, down, left, and right while the collision probability is greatly increased, the cleaning effect is greatly increased.

In addition, it is also easier to discharge the pollutants removed from the media (22), (24), (26).

And the fourth embodiment of the upflow filtration device according to the present invention, as shown in Figure 6, the inclined sedimentation plate 60 is further provided in the lower portion of the media layer 20 of the filtration tank 10.

The inclined sedimentation plate 60 is not particularly limited as long as it is a structure well known to those skilled in the art, the side plate is formed on a plurality of inclined sedimentation plate, water can pass through the side plate Multiple holes can be formed.

When the inclined sedimentation plate 60 is installed as described above, the raw water (filtrate) flowing into the inlet 14 passes through the inclined sedimentation plate 60 before being introduced into the filter medium layer 20, and the precipitation is made. The effect of reducing the filtration burden is obtained.

It is also possible to install an inclined sedimentation tube instead of an inclined sedimentation plate, and the inclined sedimentation tube is installed to be inclined obliquely by connecting several pipes in parallel so that the contaminants contained in the water as the inclined sedimentation plate rises through the tube. Precipitation can increase water treatment efficiency.

In addition, since the contaminants dropped from the media (22), (24), and (26) are collected downward along the gradient settling plate (60) when the back washing of the media layer (20) is performed. The discharge of is made easier.

In the fifth embodiment of the upflow filtration apparatus according to the present invention, as shown in FIG. 7, the screw 33 is formed in different stages at different pitches on the rotary shaft 34, and the screen 42 is restricted from rotation. It is configured to be coupled to each of the screws 33 of the rotary shaft 34 in the state.

For example, the top screen 42 is a screw 33 formed on the rotary shaft 34 above the top stirring blade 36 has a small pitch, and between the top stirring blade 36 and the intermediate stirring blade 36. The screw 33 formed on the rotary shaft 34 of the rotary shaft 34, the screw 33 formed on the rotary shaft 34 between the intermediate stirring blade 36 and the lower stirring blade 36, and the rotary shaft below the lower stirring blade 36 ( 34 is configured to increase the pitch toward the bottom gradually toward the screw 33 formed.

When the pitch of the screw 33 is configured to change the pitch in stages as described above, the distance that the screen 42 of each stage moves as the rotary shaft 34 rotates is different from each other, so that the rotation of the rotary shaft 34 As the rotation or reverse rotation, the gap between the screens 42 becomes narrow and then goes away.

And a sixth embodiment of the upflow filtration device according to the present invention, as shown in Figures 8 and 9, forming a screw 19 on the inner surface of the filtration tank 10, the screen 42 is the rotating shaft Combination is made through the key 35 or the like so as to rotate together with the 34.

Each screen 42 is installed in the state that the outer peripheral surface is coupled to the screw 19 of the filtration tank (10).

When configured as described above, the screen 42 rotates as the rotating shaft 34 rotates, and moves up and down along the screw 19 of the filtration tank 10 of the screen 42.

When the screen 42 rotates as the rotary shaft 34 rotates as described above, the rotation of the

media

22, 24 and 26 in the backwashing process is more dynamic while forming a vortex, It is effective to clean the contaminants attached to 22), (24) and (26).

Also in the case of the screw 19 formed in the filtration tank 10, it is formed between the screen 42 to form the left and right screws alternately in steps of the screen 42 or to gradually increase the pitch of the screws in steps. It is preferable because the interval of can be changed.

In the above-described third and fifth embodiments to sixth embodiments, the upper screen 42 or the lower screen 42 can also be installed in a constrained state, and the intermediate screen 42 is installed in the middle. It is also possible to install only the screen 42 to be moved up and down.

In the seventh embodiment of the upflow filtration device according to the present invention, as shown in FIG. 10, the screen 42 and the bottom screen 42 installed in the middle except for the top screen 42 are moved up and down. It further comprises a screen moving device 70 to.

The screen moving device 70 is a cylinder 72 installed on the outside of the filtration tank 10 and a piston coupled to the cylinder 72 and the end of the rod is coupled to the bottom screen 42 ( 74 and a plurality of connecting bars 76 which connect the screen 42 installed in the middle except the top screen 42 and the bottom screen 42 to move together with each other.

The connecting rod 76 is preferably arranged in a position that is symmetrical or divided at equal angles so that the screen 42 does not tilt to one side when the screen 42 moves up and down.

The screen 42 positioned at the top is installed in a fixed position.

When the screen moving device 70 is installed as described above, a change occurs in the interval between the media (22), (24), (26) as the remaining screen (42) except for the top screen 42 is moved. More effective backcountry.

In the above description, the cylinder 72 is described as being installed on the bottom surface of the filtration tank 10. However, the cylinder 72 may be provided on the top surface of the filtration tank 10. In this case, the bottom screen 42 is installed in a fixed position, and the screen 42 in the middle and the top screen 42 are moved up and down at the same time.

The screen moving device 70 is configured to move one or more screens 42. For example, the connecting rod 76 is connected to two or more screens 42 to move together, and the piston 74 is connected to one of the screens 42 to which the connecting rod 76 is connected. Install so that the ends are connected.

In the case of connecting the connecting rod 76 to only one screen 42, the connecting rod 76 is configured to connect the rod of the piston 74 so that the corresponding screen 42 is moved up and down.

And although the embodiment of the upflow filtration device according to the present invention is not shown in the figure, it is also possible to install a mixing tank and agglomeration tank connected to the inlet 14 side.

The embodiment of the upflow filter device according to the present invention configured as described above does not require large-scale drug mixing, flocculation paper, sedimentation basin, filter paper, there is no difficulty in securing a sewage treatment plant site, chemical treatment and precipitation, filtration It can be performed at high speed, is useful not only in large sewage treatment plants but also in wastewater treatment, and is also very useful in small sewage or wastewater treatment. In particular residue to nutrients lower the of the concentration of phosphorus after the drug injection and mixing agglomeration process while passing through the wobble plate the particles precipitated with AlSO ₄ or FeSO ₄ form first and coarse particles to precipitate the remaining fine particles present in the effluent of sewage treatment plants is It can be collected by passing through the filter layer.

In the above, a preferred embodiment of the upflow filtration device according to the present invention has been described, but the present invention is not limited thereto. It belongs to the scope of the present invention.

The apparatus of the present invention can be used in water purification plants, can be applied to wastewater and wastewater treatment, and can also be used for desalination of seawater.

Claims

A filtration tank in which an inlet through which raw water (sewage) flows is formed at a lower end thereof, and an outlet through which filtered water (purified water) is discharged is formed at an upper end thereof;

A mediator layer installed inside the filtration tank and having media having different thicknesses and forming a plurality of layers;

A plurality of screens installed on the upper and lower surfaces of the media layer to prevent separation of the media and forming a plurality of fine holes;

Is installed across the center of the filtration tank up and down and a stirring device including a rotating shaft which is rotated forward and backward to receive the rotational force of the motor and the rotating blade is installed in the filter layer to agitate the filter medium;

An upflow filtration device including a backwashing device for supplying backwash water to the inside of the filter bed to perform backwashing.
The method according to claim 1,

The media layer is a lower specific gravity and a relatively thick media of the media is disposed in the lower portion, the specific gravity is relatively small toward the upper portion of the upflow filter device consisting of a relatively small thickness of the fibers are arranged.
The method according to claim 1 or 2,

The media layer is an upflow filtration device composed of two to five layers.
The method according to claim 1 or 2,

The median layer is a median formed of fibers of 10 to 20 deniers in the bottom layer, the median formed of fibers of 1 to 5 deniers in the top layer, and 6-10 deniers in the middle layer An upflow filtration device for arranging the media formed from phosphorus fibers.
The method according to claim 1,

The inside of the filtration tank upflow filter device for installing a plurality of screens across the inside of the filter media layer so as not to mix the media of different media thickness of the filter media layer.
The method according to claim 5,

The left and right screws are formed on the rotating shaft so that the upper and lower screws of the stirring blades are located in different directions.

Upstream filtration apparatus configured to be coupled to the left or right screw of the rotary shaft in the state that the screen is installed in the upper and lower and the middle of the media layer is constrained rotation.
The method according to claim 5,

It is formed by placing screws with different pitches on the upper and lower portions of each stirring blade on the rotating shaft,

Upstream filtration device configured to be coupled to the screw of the rotating shaft in the state that the screen is installed in the upper and lower and the middle of the media layer is constrained rotation.
The method according to claim 5,

The left and right screws are disposed on the inner surface of the filtration tank at the positions corresponding to the upper and lower portions of the stirring blades of the rotating shaft so that the left and right screws are disposed.

Upstream filtration device is configured to combine each of the screen installed in the upper and lower and the middle of the media layer to allow sliding movement while rotating together on the rotating shaft.
The method according to claim 5,

It is formed by placing screws of different pitches on the inner surface of the filtration tank at positions corresponding to the upper and lower portions of the stirring blades of the rotary shaft,

Upstream filtration device is configured to combine each of the screen installed in the upper and lower and the middle of the media layer to allow sliding movement while rotating together on the rotating shaft.
The method according to claim 5,

Further comprising a screen moving device for moving one or more of the screen up and down,

The screen moving device includes a cylinder installed on the outside of the filtration tank, a plurality of connecting rods for connecting the screens moved up and down integrally with each other, and a rod coupled to the cylinder and connected to the connecting rods. Upflow filter comprising a piston coupled to the end of the.
The method according to claim 1,

The backwashing apparatus includes an ejector for mixing and supplying backwashing water and air, and a backwashing water supply pipe connected to the ejector and spraying backwashing water mixed with air to a plurality of points in the media layer.
The method according to claim 1,

And an inclined sedimentation plate installed under the medial layer in the filtration tank and having a plurality of holes formed therein.