JP2000237738A - Brackish water distributing device and water treating device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brackish water distributing device and a water treating device the distributing device by which impurities or suspended matter stuck onto the device in a filtration process can easily be removed. SOLUTION: Plural air dispersing materials 10 each having an inverted V-shaped cross section and having many orifices 12 are arranged in the horizontal direction at a prescribed interval 11 between the adjacent air dispersing materials 10. In the longitudinal direction of the air dispersing materials 10, dividing members 14 are provided at almost equal intervals. On the air dispersing materials 10, a perforated plates 13 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device or a fluid for filtering water in a wide range of fields such as domestic wastewater, wastewater from food factories, chemical factories, and pharmaceutical factories, landfill leachate, tap water, service water, and seawater. The present invention relates to a steam-water distribution device attached to a bed biological filtration device or a fixed-bed activated carbon adsorption device, and a water treatment device using the steam-water distribution device.

[0002]

2. Description of the Related Art Conventionally, a filter layer is formed by supporting a granular medium such as gravel, sand, activated carbon and a plastic filter medium in a circular or rectangular filter tank with a support material. There is known a filtration device characterized by supplying raw water from the upper or lower part of a filtration tank and passing the water in a downward flow or an upward flow, and filtering pollutants in the raw water by a filter medium constituting a filter layer. I have.

For example, in Japanese Patent Application Laid-Open No. Hei 9-262596, as shown in FIG. 5, a bottom of a filter pond is formed as a drainage channel 21 and support beams 22 are erected at appropriate intervals in the drainage channel 21. An air distribution tube 24 having a plurality of air discharge holes 23 formed in a direction perpendicular to the paper surface is placed in parallel on the support beam 22, and a slit plate 25 is disposed above the air distribution tube 24.
A dispersed gravel layer 26 is spread over the entire surface to a predetermined thickness, and a porous concrete layer 27 is formed on the dispersed gravel layer 26,
A filtration device in which a filter medium layer 28 is laminated on a porous concrete layer 27 is disclosed (hereinafter, “conventional filtration device 1”).
).

As shown in FIG. 6, Japanese Patent Publication No. Sho 60-13724 discloses a pipe 32 for discharging and passing filtered water or backwash water into a bottom gutter 31 in a filtration pond and an air for backwashing. There is disclosed a filter device in which a gas manifold 33 for supplying a gas such as the above is provided, a filter block 34 is provided on the upper portion thereof, a gravel layer 35 is provided on the upper portion of the filter block 34, and a sand layer 36 is further laminated on the upper portion. (Hereinafter referred to as "conventional filtration device 2"). The filtration block 34 includes the inclined flat wall 3.
The primary lateral conduit 38 is divided into a primary lateral conduit 38 and a secondary lateral conduit 39, and each of the members 38a at the bottom of the primary lateral conduit 38 is partially notched in a direction perpendicular to the plane of the drawing so that water or gas can flow. Is formed. In addition, on the inclined plane wall 37,
A gas adjusting orifice 40 and a liquid adjusting orifice 41 are formed, and a large number of second orifices 43 are formed in a plate 42 above the secondary lateral conduit 39.

However, in the conventional filtering apparatus 1, when raw water is supplied from the lower part of the filtration pond and is passed through a so-called upward flow method, impurities and suspended matter such as leaf litter and plastic bags contained in the raw water are removed. There are cases where the air enters the air dispersion pipe 24 or adheres to the porous portion of the dispersed gravel layer 26 or the porous concrete layer 27 on the slit plate 25. These contaminants and suspensions cause a reduction in filtration performance, and therefore need to be periodically removed. However, in the conventional filtering device 1, the air dispersion pipe 24 is supported by the support beam 22,
Since the lower portion of the air dispersion tube 24 is substantially closed, the operation of removing foreign substances and suspended matter attached to the inside of the air dispersion tube 24 is extremely complicated. In addition, when foreign matter or suspended matter adheres to the porous portion of the dispersed gravel layer 26 or the porous concrete layer 27, the porous concrete layer 27 and the dispersed gravel layer 26 must be cleaned after removing the upper filter medium layer 28. However, it is almost impossible to remove foreign substances and suspended matter entering the porous portion of the porous concrete layer 27. To remove foreign substances and the like in the dispersed gravel layer 26, the porous concrete layer 27 must be destroyed. However, there is a disadvantage that those deposits cannot be removed. Further, in the conventional filtration device 1, an air channel communicating with the air distribution tube is provided to supply the air to the air distribution tube 24. However, if such an air channel is separately provided, a space corresponding to the air channel is provided. This necessitates a large size of the filtration device.

[0006] In the conventional filter device 2 as well, when the contaminants and suspended matter adhere to the gas adjustment orifice 40 and the liquid adjustment orifice 41 when the filtration is performed by the upward flow method, the adjacent primary horizontal conduit 38 is used. Are so close to each other that they must be removed through notches formed partially in each member 38a at the bottom of the primary lateral conduit 38, and the removal operation is extremely complicated. It is. Further, in order to remove foreign substances and suspended matter attached to the second orifice 43, the gravel layer 35 and the sand layer 36 must be removed, and the work of removing foreign substances and the like is extremely complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to make it possible to easily remove foreign substances and suspended substances attached to an apparatus during a filtration process. An object of the present invention is to provide a steam-water distribution device and a water treatment device using the steam-water distribution device.

[0008]

In order to achieve the above object, the present invention provides a water / water distribution apparatus in which a plurality of air dispersion members are arranged in a horizontal direction with a predetermined interval between adjacent air dispersion members. As a result, it is possible to easily remove foreign substances that have entered between the air dispersion materials and foreign substances that have adhered to the upper member of the air dispersion material.

Further, an air / water distribution device is disposed at a predetermined height from the bottom of the tank, and the water / water distribution device used in a water treatment device having a filtration tank provided with a filter medium layer on the top of the air / water distribution device is described above. By adopting the air-water distribution device of the configuration, when non-treated water is passed in the upward flow system, the foreign substances entering between the air dispersion materials and the foreign substances adhering to the upper member of the air dispersion material Etc. can be easily performed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention, as a first invention, is a steam-water distribution device arranged in a filtration tank, wherein a plurality of air dispersion materials are provided between adjacent air dispersion materials. A steam / water distribution device is provided, which is horizontally arranged with a space therebetween and has a perforated plate above the air dispersion material. According to the first aspect, since the predetermined interval is provided between the adjacent air dispersion materials, the removal of the foreign matter entering between the air dispersion materials and the foreign matter clogged in the hole of the perforated plate is removed. Work can be performed easily.

According to a second aspect of the present invention, there is provided the air / water distribution apparatus according to the first aspect, wherein the air dispersion material has at least one orifice and has a lower part opened. According to the second invention, since the lower portion of the air dispersion material is open, contaminants and suspended matter easily fall down,
These impurities and the like hardly adhere to the air dispersion material. Also, even if the orifice is clogged with such foreign substances,
It can be easily removed from the opening.

According to a third aspect of the present invention, there is provided the air / water distribution device according to the first or second aspect, wherein partition members are provided at predetermined intervals in a longitudinal direction of the air dispersion material. According to the third aspect, since the partition members are provided at predetermined intervals in the longitudinal direction of the air dispersion material, the air discharged from the orifice of the air dispersion material has substantially the same amount for each partition partitioned by the partition member. Since the air is discharged as air, the member such as the filter medium installed on the upper part of the water / water distribution device can be washed substantially uniformly.

According to a fourth aspect of the present invention, there is provided a water / water distribution device according to the first, second or third aspect, wherein the air dispersion material has a substantially inverted V shape. According to the fourth aspect, since the air dispersion material has a substantially inverted V shape, the cleaning operation inside the air dispersion material is easy.

According to a fifth aspect of the present invention, a water / water distribution device is disposed at a predetermined height from the bottom of the tank, and the water / water distribution device is used in a water treatment device having a filtration tank provided with a filter medium layer above the water / water distribution device. The air-water distribution device is characterized in that a plurality of air dispersion materials are horizontally arranged with a predetermined interval between adjacent air dispersion materials, and a perforated plate is provided above the air dispersion materials. And a water treatment apparatus. According to the fifth aspect of the present invention, when non-treated water is passed through in the upward flow method, the removal work of the foreign matter that has entered between the air dispersion materials and the foreign matter clogged in the holes of the perforated plate is performed. It can be done easily.

According to a sixth aspect of the present invention, there is provided the water treatment apparatus according to the fifth aspect, wherein the air dispersion material has at least one orifice and has a lower part opened. According to the sixth aspect, as in the second aspect, since the lower portion of the air dispersion material is open, the work of removing impurities and the like attached to the air dispersion material can be easily performed.

According to a seventh aspect of the present invention, there is provided the water treatment apparatus according to the fifth or sixth aspect, wherein partition members are provided at predetermined intervals in a longitudinal direction of the air dispersion material. According to the seventh aspect, since the air discharged from the orifice of the air dispersion material is discharged as substantially the same amount of air for each partition partitioned by the partition member, the air is installed at the upper part of the steam-water distribution device. The filter medium can be washed almost uniformly.

Further, as an eighth invention, there is provided the water treatment apparatus according to the fifth, sixth or seventh invention, wherein the air dispersion material has a substantially inverted V shape. According to the eighth invention, as in the fourth invention, the work of cleaning the inside of the air dispersion material can be easily performed.

And, as a ninth invention, the fifth, sixth,
In the seventh or eighth invention, there is provided a water treatment apparatus characterized in that an air distribution pipe is inserted into a lower space of an air dispersion material. According to the ninth aspect, since there is no need to provide an air duct, the water treatment device can be made compact.

[0019]

Embodiments of the present invention will be described below. FIG. 1 is a longitudinal sectional view of a water treatment apparatus using the steam / water distribution device according to the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. 1 and 2, 1 is a raw water inflow pipe, 2 is a pressure culvert into which raw water flows, 3 is an air distribution pipe for air cleaning, and an air distribution pipe 3
Is divided into 3a and 3b. Furthermore, each air distribution pipe 3
A plurality of branch pipes 4 are branched from a and 3b, and the tip of the branch pipe 4 is inserted near the top of an air dispersion material (refer to the numeral 10 in FIG. 4 described later) of the steam-water distribution device 5 located above. . The steam-water distribution device 5 is installed at a height of about 2 m from the bottom of the tank, a gravel layer 6 is installed on the upper part thereof, and an activated carbon layer 7 is laminated on the upper part of the gravel layer 6. 8 is a filtration chamber, 9 is a trough. The installation height of the water-water distribution device 5 from the bottom of the tank is determined in consideration of the easiness of removing impurities by hand.
It is preferable to set the distance to about 1.5 to 2 m.

As shown in FIGS. 3 (a) and 3 (b), the water / water distribution device 5 is provided with a plurality of substantially V-shaped air dispersion members 10 between adjacent air dispersion members 10, 10. Interval 11 (about 1
0 cm) and are arranged in the horizontal direction, and a large number of orifices 12 are formed in the air dispersion material 10. The space 11 between the air dispersion materials 10 and 10 is preferably set to 5 to 20 cm. If the interval is less than 5 cm, it is difficult to insert a cleaning member such as a hand or a brush, and it becomes difficult to remove the cleaning member. On the other hand, if the distance exceeds 20 cm, the distance between the air dispersing members 10 and 10 becomes wide, and the dispersibility of air decreases.

The perforated plate 1 is provided above the air dispersion material 10.
The air dispersion material 10 supports the perforated plate 13 and has a function as a support member for improving the strength of the entire water / water distribution device 5. In the longitudinal direction of the air dispersion member 10, partition members 14 are provided at substantially equal intervals, and the air discharged from the orifice 12 of the air dispersion member 10 has substantially the same amount for each partition partitioned by the partition member 14. Since the air is discharged through the perforated plate 13 as air, the gravel layer 6 and the activated carbon layer
Can be washed almost uniformly. In this embodiment, the shape of the air dispersion material 10 is substantially inverted V-shape. However, the shape is not limited thereto, and may be substantially inverted U-shape or substantially triangular shape having an opening at the bottom. In short, the lower part of the air dispersion material opens,
Any structure may be used as long as impurities can easily fall.

In the water treatment apparatus configured as described above, when filtration is performed, the raw water flowing into the water treatment apparatus from the raw water inflow pipe 1 flows into the steam-water distribution apparatus 5 through the pressure culvert 2. I do. The raw water flowing into the air-water distribution device 5 is
A large number of holes 15 provided in the perforated plate 13 reach the activated carbon layer 7 through the gravel layer 6, and are further introduced from the filtration chamber 8 through the trough 9 to a processing apparatus in the next step, where predetermined processing is performed.

As a result of the above-mentioned filtration treatment, pollutants in the raw water accumulate in the gravel layer 6 and the activated carbon layer 7, and the orifice 12 and the perforated plate 1
Since impurities and suspensions may be clogged in the holes 15 of 3, and the filtration performance may be reduced, backwashing as described below is performed at a certain timing.

That is, the air distribution pipes 3 to 3a and 3a
b, from the branch pipe 4 to the air dispersing material 10
As shown in FIG. 4, the air having a predetermined pressure that has reached the inside is pushed down the water surface 16 and discharged from the upper orifice 12 formed in each air dispersion material 10. In this manner, air having substantially the same pressure is discharged from the upper orifice 12 provided on each air dispersion member 10, and the partition members 14 are provided at substantially equal intervals in the longitudinal direction of the air dispersion member 10. Therefore, the air discharged from the orifice 12 becomes substantially the same amount of air for each partition partitioned by the partition member 14, and is discharged through the large number of holes 15 of the perforated plate 13,
The upper gravel layer 6 and the activated carbon layer 7 can be washed substantially uniformly.

Further, since a predetermined interval 11 is provided between the adjacent air dispersing materials 10, 10, the foreign matter or the perforated plate 13
The operation of removing impurities and the like clogged in the large number of holes 15 can be easily performed. Further, since the air dispersion material 10 has a substantially inverted V-shape, the cleaning work of the air dispersion material 10 is easy,
The work of removing contaminants and suspended matter clogged in the orifice 12 can be easily performed.

Further, since the water / water distribution device 5 is disposed at a predetermined height from the bottom of the tank, it is easy to manually remove these impurities and the like, and the height of the pressure culvert 2 can be sufficiently secured. Thus, the pressure difference between the inlet and the end of the raw water flowing into the pressure culvert 2 is reduced, and the uniform distribution of the raw water passing through the steam / water distributor 5 can be improved.

[0027]

Since the present invention is configured as described above, the following effects can be obtained. (1) According to the first aspect of the present invention, since a predetermined interval is provided between adjacent air dispersing materials, contaminants entering between the air dispersing materials and holes of the perforated plate are clogged. Removal of impurities and the like can be easily performed. (2) According to the second and sixth aspects of the present invention, since the lower portion of the air dispersion material is open, foreign substances and suspended matter easily fall downward, and these foreign substances and the like are contained in the air dispersion material. It becomes difficult to adhere. Further, even if the orifice is clogged with such foreign substances, it can be easily removed from the opening. (3) According to the third and seventh aspects of the invention, since the partition members are provided at predetermined intervals in the longitudinal direction of the air dispersion material,
Since the air discharged from the orifice of the air dispersion material is discharged as almost the same amount of air for each partition partitioned by the partition member, the filter media installed at the top of the water / water distribution device is washed almost uniformly. can do. (4) According to the fourth and eighth aspects of the present invention, since the air dispersion material has a substantially inverted V-shape, the inside of the air dispersion material can be easily cleaned. (5) According to the fifth aspect of the invention, when the non-treated water is passed in the upward flow system, the predetermined interval is provided between the adjacent air dispersing materials, so that the space between the air dispersing materials is increased. It is possible to easily perform the work of removing foreign substances that have entered and foreign substances clogged in the holes of the perforated plate. Further, since the water / water distribution device is disposed at a predetermined height from the bottom of the tank, it is easy to manually remove impurities and the like, and the flow rate of the raw water passing through the water / water distribution device can be smoothed. (6) According to the ninth aspect of the present invention, since there is no need to provide an air duct, the water treatment apparatus can be made compact.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a water treatment apparatus according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

3 (a) is a partially enlarged sectional view of FIG. 3 (b), and FIG. 3 (b) is a partially cutaway perspective view of a water / water distribution device according to the present invention.

FIG. 4 is a diagram illustrating a method for performing cleaning with air using the water / water distribution device according to the present invention.

FIG. 5 is a longitudinal sectional view of a conventional filtration device.

FIG. 6 is a longitudinal sectional view of another conventional filtering device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Raw water inflow pipe 2 ... Pressure culvert 3, 3a, 3b ... Air distribution pipe 4 ... Branch pipe 5 ... Air / water distribution device 6 ... Gravel layer 7 ... Activated carbon layer 8 ... Filtration chamber 9 ... Trough 10 ... Air dispersion material 12 ... Orifice 13 ... perforated plate 14 ... partition member 15 ... hole 16 ... water surface

Claims (9)

[Claims] 1. A steam / water distribution device disposed in a filtration tank, wherein a plurality of air dispersion materials are horizontally arranged at a predetermined interval between adjacent air dispersion materials. And a perforated plate at the top of the water and water distribution device. 2. The air dispersion material having at least one orifice and having an open lower portion.
An air / water distribution device as described. 3. The air / water distribution device according to claim 1, wherein partition members are provided at predetermined intervals in a longitudinal direction of the air dispersion material. 4. The air / water distribution device according to claim 1, wherein the air dispersion material has a substantially inverted V shape. 5. An air / water distribution device used in a water treatment apparatus having a filtration tank provided with a filter medium layer at an upper portion of the air / water distribution device, wherein the air / water distribution device is disposed at a predetermined height from the bottom of the tank. A water treatment apparatus comprising: a plurality of air dispersion members arranged horizontally with a predetermined interval between adjacent air dispersion members; and a perforated plate provided above the air dispersion members. 6. An air dispersion material having at least one orifice and having an open lower portion.
A water treatment apparatus as described in the above. 7. The water treatment apparatus according to claim 5, wherein partition members are provided at predetermined intervals in a longitudinal direction of the air dispersion material. 8. The water treatment apparatus according to claim 5, wherein the air dispersion material has a substantially inverted V shape. 9. The water treatment apparatus according to claim 5, wherein an air distribution pipe is inserted into a lower space of the air dispersion material.