JPH09103610A - Packed bed type water treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter capable of filtering water to be treated of quantity more than conventional quantity in stable quality by preventing the surface undulation phenomenon of a packed bed. SOLUTION: A packed bed type water treatment apparatus is equipped with a water treatment tank 11 into which water to be treated flows in a supply port 12, the packed bed 13 packed with particles for filtering water to be treated in the water treatment 11 and a distributing plate 16 having a large number of apertures formed on almost the entire surface on the way of the flow of water to be treated from the supply port 12 to the packed bed 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a packed bed type water treatment device.

[0002]

2. Description of the Related Art A water treatment device having a packed bed such as a filtration device or an adsorption device using sand or activated carbon is sometimes installed in water treatment facilities such as water supply facilities and sewerage facilities. In particular, in the case of water supply facilities, the quality of the tap water source has deteriorated in recent years, so the introduction of a sand filtration device that performs two-layer filtration with anthracite and sand and an activated carbon adsorption device that filters with activated carbon are rapidly Is progressing to.

FIG. 3 is a front sectional view illustrating a conventional pressure type filter. As shown in the figure, inside a water treatment tank 1 of a filter, a packed bed 2 is formed which is filled with a large number of particles and filters the water to be treated. The packing layer 2 is formed on an upper portion of a lower support layer made of a support material 3 such as gravel.

An L-shaped baffle plate (baffle plate) is provided in the vicinity of the supply port 5 into which the water to be treated flows so as to disperse the water force.
6 are attached. The baffle plate 6 has a simple structure in which a substantially rectangular plate is bent and integrally formed, and the horizontal portion 7 is arranged so as to face the outlet end 5 a of the supply port 5. .

Therefore, the water to be treated flowing out of the outlet end 5a of the supply port 5 and flowing into the water treatment tank 1 is blocked by the baffle plate 6.
Collides with the horizontal portion 7 of the filter, is dispersed, and flows down to the surface of the filter medium 4. Then, the water to be treated is filtered by the filter material 4, and the support material 3
After flowing through the space, it flows out through the discharge port 8.

[0006]

However, in the conventional filter, the water flow of the water to be treated flowing from the supply port 5 into the water treatment tank 1 is simply dispersed by the plate-shaped baffle plate 6 to filter the medium. Since it was dropped on the surface of No. 4, the water flow of the water to be treated was not evenly dispersed.

Therefore, especially when the flow velocity of the water flow is increased and the filtration speed is increased, the filter material 4 which is a fine particle moves due to the non-uniform water flow and the surface of the packed bed 2 becomes wavy (so-called). (Terrain phenomenon) had occurred. When this unsteady phenomenon occurs, the water to be treated cannot be filtered with stable water quality, and there is a risk that the water quality of the water flowing out from the discharge port 8 deteriorates. In the worst case, the filter medium 4 and the support material 3 may be mixed, and the filter medium 4 may flow out from the discharge port 8 together with water.

The present invention has been made in view of the above circumstances, and it is a filtration with a rectifying device capable of preventing a corrugation phenomenon on the surface of a packed bed and filtering a large amount of water to be treated with stable water quality. An object of the present invention is to provide a packed bed type water treatment device such as a machine.

[0009]

In order to achieve the above object, the present invention provides a water treatment tank into which water to be treated flows from a supply port, and the water treatment tank is filled with particles to be treated. A packed bed for filtering water and a rectifying plate which is provided inside the water treatment tank with a large number of openings formed on almost the entire surface and is provided in the middle of the flow of the water to be treated from the supply port to the packed bed. It is characterized by having and.

Further, the aperture ratio of the straightening plate is 3% to 10%.
It is characterized by being.

[0011]

In the present invention, the water to be treated which has flowed in from the supply port flows out substantially uniformly from the large number of openings formed on the almost entire surface of the current plate provided on the way. In order for this to be successful, it is appropriate to set the aperture ratio of the current plate to 3% to 10%. Empirically, if the opening ratio is higher than this, the rectifying effect cannot be obtained, so that the unsteady phenomenon cannot be prevented, and if the opening ratio is lower than this, the water flow rate is reduced, which is not practical. By appropriately providing the aperture ratio of the straightening plate in this manner, the water to be treated can be straightened without reducing the amount of treated water. Thus, the water flow of the water to be treated is evenly distributed over the entire surface of the packed bed, so that the inland phenomenon of particles in the packed bed is prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. (First Embodiment) FIG. 1 is a front sectional view showing a packed bed type water treatment device having a rectifying device according to a first embodiment of the present invention.

The filter 10 is a pressure type filter, and the water to be treated is pressure-fed to the filter 10 by a pump (not shown). The water to be treated is supplied from the supply port 12 attached to the upper portion of the water treatment tank 11 of the filter 10 to the water treatment tank 1
1 flows into the interior of the device.

The packed layer 13 for filtering the water to be treated is formed by filling the inside of the water treatment tank 11 with the filter medium 15 such as anthracite or sand above the support material 14 such as gravel. In this embodiment, the support material 14 forming the lower layer is composed of gravel, and the filter material 15 forming the upper layer is composed of sand. The filter material 15 for filtering is one layer, but the layer of the filter material 15 is For example, if a two-layer structure composed of an anthracite layer and a sand layer is used, two-layer filtration can be performed.

Inside the water treatment tank 11, a straightening plate 16 located above the packed bed 13 for partitioning the flow of water to be treated from the supply port 12 to the packed bed 13 is attached. The material of the rectifying plate 16 is sufficient if it has sufficient strength, iron or vinyl chloride is preferably applied, and the inner diameter is 5 over almost the entire surface.
A large number of openings 17 of 10 mm to 10 mm are formed. The current plate 16 is an orifice type current plate having an opening ratio of the openings 17 (ratio of the total cross-sectional area of the openings 17 to the total surface area of the current plates 16) of about 5%. In this case, since the opening 17 is a through hole (orifice) formed by punching, the straightening plate 16 is a perforated plate, but the shape of the through hole is arbitrary, and a grid having many other through slits is formed. The rectifying plate 16 may be composed of a member or the like. Although not shown in the figure, it is natural that a preventive means is provided upstream from the supply port in order to prevent blockage due to suspended matter such as dust. A discharge port 18 for discharging filtered and purified water is attached to the lower portion of the water treatment tank 11.

Next, the operation will be described. When the untreated water pumped by a pump (not shown) flows into the water treatment tank 11 from the supply port 12, the untreated water is rectified by the straightening plate 16.
Is temporarily stopped by and is retained in the upper space 19 of the current plate. This is because the aperture ratio of the opening 17 of the straightening vane 16 is as small as about 5%, so that the upper space 19 and the lower space 2 of the straightening vane 16 are
This is because a pressure difference is generated between 0 and 0. Then, the water to be treated in the upper space 19 is 0.5 at each opening 17 of the straightening vane 16.
It flows through at a flow velocity of m / s or less and flows down to the surface 21 of the filter medium 15. The water filtered by the layer of the filter material 15 flows between the support materials 14 and is then discharged to the outside from the discharge port 18.

As described above, in this embodiment, the water to be treated flows down over the entire surface 21 of the filter medium 15 in a state of being uniformly dispersed, so that the inland phenomenon in which the filter medium surface 21 becomes wavy does not occur. Absent. Therefore, the water to be treated is filtered at the same filtration rate throughout the packed bed 13, and a large amount of water to be treated can be filtered with stable water quality without deteriorating the water quality. Further, it is possible to prevent the trouble that the filter material 15 is mixed with the support material 14 and is discharged from the discharge port 18.

When the filtration rate (LV) is compared with that of the conventional apparatus, the filtration rate of 1 is conventionally used to prevent the occurrence of the unsteady phenomenon.
Although it was necessary to suppress the pressure to 20 to 150 m / day or less, since the inland phenomenon does not occur in the filter 10 of the present embodiment, the filtration speed can be set to 1000 to 1200 m / day, and therefore, the water to be treated can be treated. It can be filtered in large quantities.

Particularly in the case of two-layer filtration or activated carbon filtration,
The filtration speed of the filter can be set to be considerably higher than that of the single-layer filter, but in the conventional filter, the filter material and activated carbon move to cause an unsteady phenomenon, which may deteriorate the quality of treated water. However, according to the filter 10 of the present embodiment, the non-landing phenomenon is unlikely to occur, so that the water to be treated can be filtered with stable water quality.

(Second Embodiment) FIG. 2 is a front sectional view showing a second embodiment of the present invention. Filter 30 according to the present embodiment
Is a gravity type filter that filters the water to be treated 32 that has flowed into the water treatment tank 31 by its own weight. The water treatment tank 31 is provided with a supply port 33 for feeding the water to be treated and a perforated pipe 34 for discharging the filtered water. Water treatment tank 3
A partition wall 35 for partitioning is provided inside 1. The right side of the partition wall 35 in the figure is composed of the lower support layer of the support material 14 and the upper layer 13 of the filter material 15 similar to the first embodiment. Incidentally, not the perforated pipe type water collection pipe system of the present embodiment,
For example, even if a perforated plate is provided and a water collecting device is arranged, there is no problem in practicing the present invention.

A supply port 33 is provided on the left side of the partition wall 35 in the figure.
A straightening vane 36 is attached transversely to the flow of the water to be treated from the to the packed bed 13. The straightening vane 36 has the same structure as that of the straightening vane 16 of the first embodiment, and a large number of openings are formed on almost the entire surface. 17 are formed.

Therefore, when the water to be treated flows into the water treatment layer 31 from the supply port 33, the water to be treated is rectified by the straightening plate 36.
After being temporarily damped by the above, it uniformly flows upward from each opening 17 at substantially the same filtration rate. And the partition wall 3
After exceeding 5, the mixture is filtered by the packed bed 13 and then discharged from the discharge port 34.

If the straightening plate 36 is not provided, the flow of the water to be treated inside the water treatment tank 31 becomes non-uniform and the surface of the filter medium 15 becomes uneven when the filtration speed is increased. Although the land phenomenon occurs, by providing the straightening plate 36, the distribution of the flow of the water to be treated to the packed bed 13 becomes uniform and the non-land phenomenon does not occur. Therefore, the same effect as that of the first embodiment is obtained. In the drawings, the same reference numerals indicate the same or corresponding parts. Further, it goes without saying that the gist of the present invention is not limited to the above embodiments and various modifications can be made.

[0024]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it is possible to prevent the waving phenomenon on the surface of the packed bed of the water treatment device and filter a large amount of water to be treated with a stable water quality compared to the conventional case.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a filter with a rectifying device according to a first embodiment of the present invention.

FIG. 2 is a front sectional view showing a filter with a rectifying device according to a second embodiment of the present invention.

FIG. 3 is a front sectional view showing a conventional filter.

[Explanation of symbols]

 10,30 Packed bed water treatment device (filter) 11,32 Water treatment tank 12,33 Supply port 13 Packed bed 16,36 Rectifier plate 17 Opening 32 Treated water

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B01D 29/08 540A

Claims (2)

[Claims] 1. A water treatment tank into which water to be treated flows from a supply port, a packing layer in which particles are filled in the water treatment tank to filter the water to be treated, and a water layer from the supply port to the packing layer. 2. A packed bed type water treatment device comprising: a current plate having a large number of openings formed on substantially the entire surface thereof in the middle of the flow of the water to be treated. 2. The packed bed water treatment device according to claim 1, wherein the opening ratio of the current plate is 3% to 10%.